clean way to catch flies in the house

Hi i hope this is the right place;  I just found a somewhat clean way to get rid of flies in the house, spray them with spray starch (for ironing clothes) and they will slow down so they can be caught and put outside, or use paper to pick up and remove them. I had spray starch in the kitchen and the weather changed here, its humid and suddenly there are flies in the house.  i dont like to swat them and leave that to clean up;  by chance i used the starch, it took some effort to target them but it worked.  i did this last nite, today the 2 i sprayed apparently shook it off were not hurt, so anyone who wouldnt want to hurt a fly could spray them with starch, put them out and there is no  mess to clean and nature can do what nature does.

Topic by rogersbr   |  last reply


How to water dextrin based printing ink water resistance?

I am trying to formulate water based rotogravure printing ink with dextrin as main binder inside, for printing on paper . Only problem I am facing  is  of water resistance. The dried ink (pigments) smudges when water is put over it. Please suggest the additive to over come this problem. Thanks. - Manish Patel (mtppl@yahoo.com)

Question by mtppl   |  last reply


Can liquid starch make cardboard really stiff and hard?

Especially thin cardboard? 

Question by coolcarl89   |  last reply


Which are Ecologically friendly Ultraviolet ray blockers/absorbers/stabilizers that can be used in polymer?

Hey, Working on (reinforcement) bio-composite material using bamboo fibers & starch based DIY bio plastic from starch, glycerin, vinegar. I wanted to incorporate UV Protection to my composite by adding UV protective additive in polymer mix. I searched for regular additives (Benzophenone)  that are added but I want to find if any Environmentally friendly UV stabilizers are available or can be extracted from natural sources to be used in bioplastic. (chemicals consideration) 1-PABA (p-Amino benzoic acid) & 2-ZnO Please do add your valued opinions.

Question by charmneo   |  last reply


is corn starch a good substitute for flour???

I want to make some recipes but i don't have flour and i can't leave the house. So I was wondering if corn starch is a good substitute for flour.

Question by GAMEFREAK464   |  last reply



Corn Starch for Flour in an Apple Pie Recipe?

Can you substitute Corn Starch for All-Purpose Flour in an Apple Pie Recipe?  I have all the ingredients but Flour, please let me know. Thank you,

Question by angelforever53   |  last reply


Can cassava starch be use as the main ingredient in plastic making???Just like potato starch!!

Pls... i want to conduct research about cassava starch!!11what is it in the potato ..that can be use as the main ingredient in making potato plastic??/how about the cassava starch???pls..ans this!!!?

Question by Fulyazzie   |  last reply


Is there a way to make silly putty without liquid starch?

I dont have any liquid starch and I want to make some silly putty. I want to use it as a sugru alternative for the life hacks contest.

Question by Iam4NUru   |  last reply


Get creases out of clothes that an iron and starch cannot handle...?

Boyfriend bought a nice button down shirt today. Unfortunately it has random creases along the edge down the side with the buttons. It can be hidden if he decides to button up the shirt, but he usually doesn't wear these shirts that way. I have seen these creases before in other garments but no matter how much time I spend ironing and trying to keep it smooth, once I wash it the creases come back. Does anyone know how to fix this or even what causes the fabric to do this? Thanks a bunch!!!

Question by KAMalotabit   |  last reply


How to convert starch into glucose? Trying to make sweet rice- or oat-milk.? Answered

Hi! I am trying to make rice milk or oat milk , and I need to know how I can convert the starches in those grains into glucose to make the result  taste sweet... I don´t want to add any sugar...

Question by Fypsigon   |  last reply



I have the chemicals lying around

I have Hydrogen peroxide, 1%Sodium hydroxide, 1%Copper sulphate, Nitric acid, Copper oxide, Calcium carbonate, Starch, Potassium permanganate and Hydrochloric acid is there any thing i can do with these

Question by HokageMateo   |  last reply


LEGO Weapons Better than K'NEX?

A new book is coming out from No Starch Press (whuh?) called Forbidden LEGO. It claims that LEGO is the construction tool of choice for weapons.Two vids to see the weapons in action. Well, it doesn't really make that claim. I just wanted to say it did.

Topic by fungus amungus   |  last reply


Trying to make ethanol out of grass, what chemicals could I use to break down the grass into simpler sugars?

Grass is made up of starchy carbohydrates which I think would not be converted to ethanol by yeast. What could I use to break down the starch into simpler sugars?

Question by quagss   |  last reply


Ashes stuck on my cubic charcoal briquette?

Hi, am making charcoal briquette using 6% starch as binder and 4% clay, I got a good briquette with no crack, and good density. But the problem is, the ashes stuck on my charcoal briquette, and I need to shake it hard to remove ashes, even I reduce clay to 1% and same problem. Anyone can advise me how to solve the ash problem?

Question by mahrammal   |  last reply


Advice on lost wax casting

I am looking at the cheapest way to begin casting pewter with the lost wax casting or with creating rtv silicone molds and it looks like dental wax is generally the same as jeweller's wax. I would like to know if this product looks suitable for carving for lost wax casting: http://dentala2z.co.uk/PRE10379/en I would of course melt it to make blocks to carve from. It looks like it would do the job, carving wax seems to be really expensive in whatever form. Im also looking at using silicone and corn starch. thank you

Topic by lsadwdwadw   |  last reply


Tablecloth without a Table

This tablecloth has been stiffened with starch or epoxy or something to keep its shape so that it can stand alone without a table below it.It's pretty fun for a picture, but unless you're right there on the ground like in the main pic below it's not too obvious. Well, maybe it's just not my style, but I'm sure that anyone else here can replicate it if they were interested.So how about it? Want to take it on? First person who does an Instructable about this will get... something. A custom patch and maybe something else. Link via bbgadgets

Topic by fungus amungus   |  last reply


Dentists/Lost Wax casting artists, advice about product please? Answered

I am looking at the cheapest way to begin casting pewter with the lost wax casting or with creating rtv silicone molds and it looks like dental wax is generally the same as jeweller's wax. I would like to know if this product looks suitable for carving for lost wax casting: http://dentala2z.co.uk/PRE10379/en I would of course melt it to make blocks to carve from. It looks like it would do the job, carving wax seems to be really expensive in whatever form. Im also looking at using silicone and corn starch. thank you

Question by lsadwdwadw   |  last reply


Do you cook mostly or all vegetarian food? What are your tips for staying balanced?

Was anyone else raised eating meat, then switched to mostly or all vegetarian cooking? Any tips for how to shop, filling meals, and how to avoid eating too much starch and sugar (pasta & fruit)? I'm thinking about limiting how much meat I eat, but I'm curious how to switch out of a meat-and-potatoes model I'm accustomed to from childhood. I love a good salad, have an enthusiastic passion for bean dishes, and have access to good vegetables. Looking forward to hearing your thoughts.

Topic by garnishrecipes   |  last reply


What type of binder is user for making activated carbon briquettes for water purification?

Hello everyone, I am trying to make a water purification device which needs to have compressed activated carbon filter. I am facing the problem of binding the charcoal dust together so that it does not come out when contacted with water. I tried making the briquettes with starch but it is water soluble. I have read some papers on binding the charcoal using extrusion process but could not find what exactly is the binder used. Here the binder should not cover the surface area of the carbon particles as well. I am looking to find here, what is the binder used and how is it used, i.e, ratios. I want to make something like this in the image which is water insoluble. 

Question by vin177   |  last reply


Cleaning a canvas hat.? Answered

Hi Folks. I have a favorite hat made by Panama Jack I wear a good deal in the summer however I have noticed it has become more than a little grubby. I contacted the manufacturers & I have to say I was surprised that they were not very much help, I guess in the litigious world we seem to live in they are worried that if i damage my property because I followed their suggestions I may demand a replacement or sue them for damages. Anyway does anyone have any suggestions? The hat is stiffened canvas so obviously I don't want to do anything that would cause it to soften & loose its shape unless I can re-stiffen or starch it to regain the shape. I promise I won't sue if your suggestion causes any damage :-)

Question by Nostalgic Guy   |  last reply


How to make florescent ink?

I have Googled and searched Wiki on how to make fluorescent (ultraviolet) inks. I want to know how to make them. I dont want th lemon juice , corn starch, milk or other types of invisible inks. I want to make the stuff the glows under uv light. I searched using uv, ultraviolet, fluorescent inks but couldnt find anything other than the lemon juice and other types of "invisible" writing. Please help if you know where to find or if you know how to make fluorescent (ultraviolet) inks. You can email me at whitethatchpotentloins@yahoo.com I mean the inks that u can buy for handstampers and that are put in invisible ink markers. I want to make the stuff myself and not have to buy it off the internet.... So while yes there are alot of things that glow under UV, I want it in liquid form.

Topic by WhiteThatch   |  last reply


Champagne Pomegranate Sea Salt & Goat Milk Bath: Recipe

Champagne Pomegranate Sea Salt & Goat Milk BathYum. This recipe is perfect for those of you who enjoy a long soak in the tub!Ingredients:1/2 Cup colloidal oatmeal1/2 Cup powdered goat milk1 Cup baking soda1 Cup Natrasorb Bath (starch)1 Cup coarse grain sea salts1/2 Cup epsom salts2 rounded Tablespoons shea butter3 Tablespoons Champagne Pomegranate fragrance oilInstructions:Melt shea butter in the microwave. Add melted shea butter and fragrance oil to a mixing bowl. Stir in Natrasorb Bath until all the oil is absorbed. Stir in baking soda, goat milk powder, and colloidal oatmeal. Mix well. Stir in epsom and sea salts and mix well. Scoop milk bath into 8oz. containers. Makes approximately four 8oz. containers with each holding about 7oz by weight. Pomegranate Champagne Fragrance Oil is available from Tennessee Candle Supplies. http://www.tncandlesupplies.com/Recipe is © 2008 Rebecca's Soap Delicatessen.

Topic by soapdeli   |  last reply


Any substitute for Smooth-Cast 300? Answered

We have our own homegrown substitute for Oomoo thanks to the local boy genius Mikey77 But is there any substitute for it's companion product, the very expensive ($100/gallon), two part liquid plastic stuff called "Smooth-Cast 300"? Does anyone know of a way to mix an inexpensive something up and pour it into a mold and have it harden up into a strong thing?  It doesn't have to be as invincible as Smooth-cast, but .. is plaster the only option? Update:  What am I casting?  I found a really great ornamental tile at Habitat for Humanity and want to make copies of it Update:   I'm wondering now, what if I used something from the wall/flooring department, like Mastic?  Its about $34 for two or three gallons.  It fills gaps and hardens to such a degree that it can't be chiselled easily.  I may try this. Update:  Tried mastic, it works but takes far too long to dry, on the order of three days or longer...  Maybe if I mixed in some corn starch (ala oogoo?) Thank you -foo

Question by foobear   |  last reply


(newsletter) DIY Smoker, Make a Snuggie, Sound-Proof Studio

  Art | Craft | Food | Games | Green | Home | Kids | Life | Music | Offbeat | Outdoors | Pets | Photo | Ride | Science | Tech Beat the Winter Blues! Winter is the time to learn something new! We've found a pile of great new craft, food, and organization projects for you to try, and some classic guides full of even more ideas. Try them out, and give the authors some love! New Contests: Sew something warm to win a combo sewing, embroidery, and serging machine from Singer in the Sew Warm Contest, or show off your romantic side in the Valentine's Day Contest to win some gourmet chocolate from Cocoa Puro and Socola! Coming soon: Randy's Dead Computer Contest where you can find a cool use for your old electronics gear and win a new netbook! Build a Sound-Proof Recording Studio Corn Starch Candy Molds Vegan Marshmallows Put Your Thumb Through a Can! Deconstructed Flower Vase Make Your Own Snuggie The Uranium Rosary Start an Orange Tree Amplify a NES Guitar Simple Thread Rack Hanging Shelves from Longboards "Tiny Turtles" Recipe The Convertible War Board DIY Smoker Simple UV LIghtbox Vacuum Infused Fruit Guides 5 Minute Projects Dessert Recipes Laser Cut Projects Fermentation Instructables.com - 82 2nd St. - San Francisco, CA

Topic by fungus amungus   |  last reply


Is oogoo (DIY Silicone Putty) Oven-safe?

Hello! I have a question for people who use oogoo, or generally DIY silicone molding putty made from 100% silicone caulk. I want to cast oogoo molds of lego bionicle masks with polymer clay, but my issue is I need to keep the clay inside the mold in order to prevent any kind of warping, as most of it is spread a little thin (1-2mm thickness) and I don't want to end up warping it even in the slightest. Is oogoo or cured 100% silicone caulk oven-safe as long as it's within the specified temperature range? (I already know most DIY silicone putties aren't food-grade.) The silicone caulk I'm using is GE all purpose silicone I, mixed with corn starch, acrylic paint, and baby oil. The back of the tube says that it should not be used on surfaces that will exceed 400F/205C. The polymer clay I plan on using is cured at 110C, so I don't think it'll be a problem, but I'm worried exposing the silicone caulk mold to high temperatures will cause it to release some harmful chemical compounds. I looked up an MSDS sheet for GE silicone, and they had a generalized one stating exceeding the maximum temperature will cause the release of formaldehyde. Since I plan on baking these in our kitchen oven, I wouldn't want harmful chemicals contaminating a space where we cook our food. Also, if baking isn't an option, since the polymer clay is spread thin, and cures close to 100C, would curing it in boiling water be an option? (That way any water soluble chemicals would remain contained while the clay hardens.) All help is appreciated!

Topic by SixFootBlue   |  last reply


SIGGRAPH2010 - Emerging Technologies Exhibition

Last week I went to Los Angeles to attend my first Siggraph conference. There were so many different events to attend throughout the week. I spent the majority of my time exploring the emerging technologies exhibit. With all the interactive and innovative demonstrations it felt like I had stepped into the future for a moment! In this slide show I will highlight my favorites from emerging technologies. Some of these pictures were taken by me and some I took of their website (you will be able to tell which are which). If you see something that interests you I would suggest following the links I provide to learn more. Organized by picture (put cursor in top left corner of picture to figure out what picture you are looking at) Colorful Touch Palette (1) This is an electro-tactile stimulation systems that allows the user to feel and experience the tactile sensations of painted textures. Blend and combine textures to create new sensations. Shaboned Display - An Interactive Substantial Display Using Soap Bubbles (Favorite) (2-5) This was my favorite exhibit in emerging technologies even though parts of the bubble machine weren't working. This system is designed to show images in a matrix of soap bubbles. Air pumps lie beneath the display controlling the size and shape of the bubbles by monitoring the amount of air released. This system is also interactive! When a bubble pops (touch a bubble with your finger) a musical note will play! LED Tile by Junichi Akita @ Kanazawa University (6-7) Use a laser pointer to draw on these tiles to create patterns on LEDs.  To create large display areas connect individual units of LEDs which will allow them to communicate.   You can also interact with these displays in various ways.  Tilt the tiles and the LED patterns will look like they're falling off the tile in the direction tilted. 360-Degree Autostereoscopic Display (8-9) 3D graphics with out 3D glasses.  Using 360-degree autostereoscopic display technology you are able to view all angles of a 3D volumetric objects. I don't understand all the technical details, but this I do understand...you can use this technology for 3D interactive games, cool!  You can see in the images there is an interface to play BrickBreaker.  Walk around the device as you are playing the game. Imaging Skyping with this!!!!!!!! Haptic Canvas: Dilatant Fluid-Based Haptic Interaction (10) This new technology allows you to experience new haptic sensation by putting your hand in a pool filled with dilatant fluid.. Dilatant fluid is just a 1:1 mixture of starch and water.  It has a solid-like state when an external force is applied to it (grabbed, pushed, or tapped).  And it has a liquid-like state when it is free from the external force. This research is to create a new haptic interaction using this dilatant fluid by controlling the change in state, or dilatancy, of the fluid.  They have created a glove with a sucking tube and a filter which creates a change in state of the dilatant fluid.  The haptic sensations come from the friction between the jammed particles around the finger and at the bottom of the pool. You can see me trying this device (I don't think the camera man understood what I asked him to get me in the frame, but you can see my hand!).  This video gives a great explanation. Meta Cookie (11-12) Imagine eating a lemon and it tasting like chocolate!  This is the worlds first "pseudo-gustation system" which allows humans to perceive various tastes by changing visual and olfactory information.

Topic by Carleyy   |  last reply


Eee, when I were young...

In no particular order...We had a single telephone in the house, landline, rotary dial, and several neighbours didn't have that.One TV in the house. CRT, 15 inch screen.Only three TV channels.They weren't on all night. They weren't even on all day.Black and white, all the way - TV, camera filmOnly two transistor radios in the house, running off 9V batteries the size of my fist.Most stations were on AM & LW bands. Commercial stations broadcast from "abroad".One record player in the house, which still have a position on the speed selector for playing 78rpm discs.Headphones the size of scotch eggs were the norm, not a fashion statement.No mobile phones at all.No game systems.No hand-held units.No home computers (the ZX81 came out when I was 14).The internet wasn't even a pipedream.The largest libraries had microfiche.Foreign holidays were a luxury - the only £10 trip was a one-way ticket to Australia.I did not see a black man in the flesh until I was 13. Oriental later the same year.Seat belts were not only optional, they were often not fitted.Ladders were toys, not a risk to life and limb.No speed cameras. Speed traps involved measured distances and policemen with stop-watches.No central heating.No double glazing.No catalytic converters.Petrol had lead in it, but only cost pennies a gallon.If you spent an hour in London, your snot turned black. If you spent a day there, it stayed black for a week."CCTV" was just a random collection of consonants.Old factories were called "derelict", not "industrial heritage", and kids called them "playgrounds".The bombsites were still blamed on Hitler.Russia was still Soviet, and old folk thought of them as allies.Hospitals smelled of carbolic soap, and the only infections came in with the patients. Nurses had starched collars and pink-scrubbed hands.I was the only child with asthma in a school of 400.Nobody was allergic to anything, except powdered eggs.Terrorists all had Irish accents, and telephoned the police to tell them where the bombs were.Nuclear power was going to give us free electricity in only five years - just in time to power the robot maid.Nuclear war was a genuine fear.The Falklands War was news, not history.You could hitch-hike and expect to arrive at your destination alive.Alcoholism was a hobby, not a disease.Lager was for poofters, cider was for girls.Nobody knew how to play basketball, baseball or ice hockey, and football was only ever played with a round ball. The nearest thing to "protective clothing" in sport was a goalie's gloves.Rollerskates had wheels on the corners, and strapped to your shoe.Banks were as trusted as the police. The police were trusted.Policemen were tall.Emergency vehicles went nee nah nee nah! (except for the ones with bells).Flared trousers were original.Science fiction had ray guns and robots, and spacemen were spacemen.You could travel ten miles and find people who spoke a different dialect (not just a different accent).Kids who misbehaved in school got sent to the head for a caning, instead of to the doctor for a tablet.Health and safety meant "don't do anything daft", and if you fell off a roof and broke your leg it was your own damned fault, not the fault of the roof-owner for not warning you about the drop, and nobody sued anybody.Gay meant "happy", and camp meant "in tents".Teachers that hit you were firm professionals, not dangerous perverts.The phrase "two car family" hadn't been coined....and I didn't feel quite so old.

Topic by Kiteman 


"Sonic" drilling or cutting

If we look up sonic drills today we usually get some fancy machines driving pipes in the ground, preferably softer ground.But the term includes all types of machines that use sonic vibrations to advance through a media.With the ancient and claimed to have never existed technologies in mind I did some digging...In the food industry vibrating knifes are quite common, same for "air knifes" on softer food.Even in the meat industry they find more and more uses now.Ultrasonic cutting or welding is the same thing and included in "sonic".Same for some experimental sub sonic drilling methods currently being tested.The general idea might be as old as using vibrating equippment to compact stuff, like concrete, bricks and so on.What you can compact by vibration you can also make "fluid" by vibration.Industrial feeder systems utilise this to the extreme by even making light and fine particles like flour move like water without causing any dusting.What all the techniques have in common that a suitable tool or tool head is used and that it is attempted to use the most suitable vibration frequency for the job.Anyone operating an ultrasonic welder knows the pain of finetuning for a new electrode or just new part to be welded.What does that tell us now that makes the understanding easier?Take a bottle of ketchup, preferably one that is still quite full.Turn it upside down and noothing comes out.Shake it a bit and you are either lucky or drowned in red.But hold it at an angle and start tapping it and the red sauce flows out easily.What it true for most newtonian fluids is in some way also true for non-newtonian fluids.Ever mixed corn starch and water to make these funny experiments with it?Hit it hard and it reacts really hard and is not sticky at all.Leave your hand resting on it and in sinks in and sticks to it.Stirring it very slowly is easy, go faster and you get stuck.You can do similar things with by using an external source for vibrations.For example a vibration speaker mounted to a smal cup of the goo.If you place sand on a sloped piece of plastic or sheet metal then at a low angle it will pile up easy and stay.Start vibrating the plate and the sand will start to flow off.Works fine with a vibration source mounted to a piece of steel bar or rod and a bucket of sand too.Trying to press it into the sand requires a lot of force, especially once you are a bit deeper.Let it vibrate properly and it slides rights down.If we can do the simple stuff as well as really complicated stuff in the industry then what about other materials?So far we use vibrations to make things move out of the way, compact things, transport them or to heat them up for welding plus some cutting applications.Considering the variety one might wonder why no one tries it for "difficult" materials.Machined surface can be found throughout ancient history.Finding "machined things" were vibrations was clearly used is a bit harder.The great walls are not a perfect example here as the views differ quite a bit on how they could have been created.But if we leave things melting them or a secret concret like recipe for creating for example granite then vibrations start to make some sense.You find some interesting videos on youtube where people use speakers, wires and rocks to confirm you can actually "machine" them by vibrations.Especially granite has some quite musical properties, big boulders as well as smaller ones produce destinct sounds when you hit them hard.Tests and measurements were made on granite and other hard rocks to check how fast sound travels in them , how it is refeclted and where the sound comes out or affects the surface the most.Lets just say every sample gave different results.Shape, density and dimensions affect not just the resonant frequency but also where and how the sound travels in the rock.What if??We can use a simple speaker, a plate and some rice to see how patterns form under various frequencies.Works with sand or other granules as well.The interesting patterns are the so called harmoncis.Here we see clear and destinct patters, sometimes with extremely fine lines and areas of softly vibrating granules.Some people say these harmonic frequencies have all special meanings and uses.We mainly used them to avoid problems.Imagine your new TV would not have a housing tested to be stable with all frequencies the speakers can produce.All of a sudden your back of the TV might start to rattle ;)Same for car engines.Harmonic vibrations are eliminated wherever possible.Otherwise they could multiply and affect other things in the engine or around it.Simply put it means we have various options to detect and measure vibrations on a surface or in a system.Back in the day every half decent backup generator had a mechanical indicator for the frequency of the supplied electricity.A set of tiny forks with the desired on painted red and several on either side of it.These forks were designed to get into harmonic and therfor quite intense vibrations at their set frequency.If the one for 50Hz looked blurry then all was good ;)The same principle god be applied on a big boulder of granite.Place the "vibration meter" at the desired spot and start moving around the vibration source on the surface until you find a spot that causes maximum response on the meter.Best thing here is that if you then place that surface area onto another peice of fixed in place granite both pieces will start to loose substance if vibrations are applied.The fine sediment forming is then usable as an indicator where to move the vibration source to continue once the effect literally wears off.Is it feasable?Well, if we trust mainstream science then the answer is no.A huge amount of vibration energy would be required for such a hard material, despite ancient proof that says otherwise.Semi industrial test also seemed to confirm the theory as only with very high amplitudes (loudness) and while automatically adjusting for the resonant frequency changes a measurable amount of material was removed.I struggle a bit with that as for the testing tool heads made from hardened steel or carbide were used.And that with little or no regards on how the head and tool itself affects the output.I mean in terms of having the max possible movement happening right t the tool contact surface!There is a huge difference between applying a vibration to a tool and using a system, tool and tool head DESIGNED to work at the desired frequency!Otherwise we wouldn't need a computer to design and test a horn for welding purposes or shade a knife spefically so that the vibration go along the right axis and in the right direction.You not break a hard thing with a very soft thing unless it travels fast enough to become harder as the target!This complicated explanation basically just confirms that if you hit water at a too high speed then it will just break you into pieces instead of offering a soft splashPlease do not jump of bridges or such to confirm this yourself!!If that is really true and science says it is, then how about the other way around?Works fine too, or we wouldn't have pressure washers or water cutters.Now for the part where I hope some really smart people leave helpful comments:If we can cut steel with just a stream of water, then I ask:Isn't for example copper much harder than water?Steel is much harder than copper but water cuts through it.The answer here it simple or complicated, depending on how you want to expain how it works.Comes down to speed and pressure plus the right nozzle shape to prevent a beam expansion.But then water is indeed "harder than steel".Questions:Lets say we would use a copper pipe that in lenght, thickness, hardness and diameter is optimised to transmit a frequency so the pipe end sees the max vibration like a feed horn for ultrasonic welding.Not to hard to calculate these days :)Now imagine said "main frequency" would be optimised for the pipe but also be a harmonic frequency of the rock to be worked on.The pipe end would deform quickly, abrasion does the rest and it fails before even making a decent sratch that is not copper metal on granite.No matter how hard we press nothing good enough will ever happen.BUT: If we would add more hormainc frequencies to feed our pipe we can multiply the amplitude quite easy!Just try with a sound generator from your app store, needs 2 or more channels to be usable.Pick for example 400hZ on one and 800Hz on another, then finetune around these number to hear how the tone changes ;)My theory goes like this:If all "working frequencies" would just harmonics of the resonant frequency of the granite, then they can be tuned so the effect on the pipe end is minimised.The overlaying frequencies however should result in the same effect a water cutter has: The pipe becomes ultra hard.The better the match and the more you have to get it right the harder the pipe will be.Adding now a "drilling frequency" or multiple could be used to drive these harmonics slightly out of phase.Like with the sound generator on your phone we end up with a pulsating sound, or vibration.While the pipe still vibrates at the same "hardening" mix the drilling frequency creates a peak like a jackhammer.Try it by using the heaphone output on a small speaker and placing some light and tiny things into the cone.The will violently jump around during these pulsing tones.For a drilling system the output can be mechanically maximised by utilising a pitchfork design.A head holds the vibration speakers and the tynes are tuned good enough to the frequency of the speakers.Always two would have to operate in sync though as otherwise the pitchfork movement that transfers the sound down the center bar won't work.This head could then be desgined to act as a holder for a quick change of work out pipes that are no longer long enough for tuning.I guesstimate that a well tuned design would result in a copper pipe being able to drill at least 10 to 15cm into solid granite before it wears off too much.And we are talking here about just a few mm to get the thing out of tune!But would dare to desing such a thing just to confirm a theory that no one ever really dared to test? ;)And if friction welding works as good as ultrasonic welding, then what would happen if we try this with the right frequencies and vibrations instead of wasting tons of energy?

Topic by Downunder35m