A third liquid that will not mix ?

I've made an oil dropper/hourglass, i have used water and (olive)oil because they will not mix. is there a third liquid that i could add without it mixing with the oil or water ?

Asked by rabarbarbaar! 5 years ago


Automated fluid dropper

Hi, I want to release droplets of water one-by-one on command, and have been doing some research on how to do that, but I'm wondering if anyone has some other ideas or has heard of a ready-made solution. So far I have come across: ======== -peristaltic pumps with really low flow rates, like the one here http://aptinstruments.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=AI&Product_Code=SP100VO&Category_Code= It goes down to 0.09 ml/minute, which should be small enough. I can selectively turn the pump on and off, feeding water to a small tube or dropper end, producing the water drops. These are pretty expensive, the cheapest one I've seen is around $60. ======== -DIY systems like the one pictured here with a solenoid opening and closing a safety pin on a tube. http://www.maggiecarsonromano.com/index.php?/projects/what-made-the-wound-wound-the-thread/ Maybe I could tune the distance of the solenoid so it just opens the pin a tiny amount, and a drop or so is allowed through. ======== -or I could use a more typical water pump, attach it to something with a really small aperture. I could turn the pump on and off. I have a hard time picturing drop-by-drop control with this, I might be able to release very small amounts, and maybe some 2nd reservoir between the motor and dropper could be designed to aid this. ======== Is there a ready-made solution to what I'm trying to do? If I just get a regular water pump what should I look for? Ideally I'd like to get a pump that's as quiet as possible, too. Thanks bros. Josh  

Posted by djdune 7 years ago


How do I build a small gate for my vegetable patch, made with wire and star droppers?

I have a 3 inch square wire fence around my vegie patch, the posts are star droppers. My dog gets in if I leave to gate open, but the current one, made of the same wire is all bent and broken and difficult to open& close. I need to make something light enough to hand from the star dropper, but it needs to be 1 metre wide by about 1 metre high.

Asked by jackim 9 years ago


Model Plane Location dropper

Hi guys I am looking for some help, I am hoping to create a model plane/helicopter which will rotate on an arm (or fly for real). As it rotates (or flies) it will pass a fixed point on the ground and release its cargo onto the ground below. The fixed point must communicate in some way with the plane/helicopter to show that the location can be moved and the planes cargo will drop to the new location. It is a tricky task.  I am also restricted in size - my entire project cannot be larger than 500mm  All helpful ideas would be HUGELY appreciated.

Posted by j-nolan 3 years ago


My biggest childhood crisis!!!

That reminds me one time I got a bead stuck up my nose it was up so far you couldn't feel it if you stuck your finger as far up as you could. that night I went to a hospital and it took 4 nurses to hold me down while they stuck small vacuums up my nose. ( I was actually over powering the nurses and I was only 7 years old.) I could see blood going up the vacuums tubes.... all failed that night so I want home and went to bed. the next morning my mom took me to a eyes nose and ears doctor ad he just numbed my nose with a little dropper and suck a piece of curved metal up there (I still screamed a lot but I tried not too move) and hooked it around the bead and he pulled it right out. one try. it felt so weird with that thing up my nose. on the way home my mom took me to toys 'R' us and bought me two lego sets. I was like "oh yeah"!!!!

Posted by the_burrito_master 9 years ago


Give me a Hair Style

Well, I want a new one. So I took a picture with my hair up, and cut it out, he are the instructions.Download this image.Open it in MS Paint (or some other image editor)Use the eye dropper to select the sample of my hair colorDraw me some hairPost it back up here.If we get some good ones, i'll try the best one =]

Posted by Weissensteinburg 11 years ago


my gerbil is sick, what can i do? Answered

One of my sisters gerbils died, and my mom didin't notice it until labout a day after, and she had 3. one of them is fine, but the other remaining one has stopped eating and drinking, and its not moving. we put some sugar water into an eye dropper, and put some in its mouth, and now it opened its eyes and started moving around again, but basically all we are doing right now is keeping it warm, giving it sugar water, and isolating it from the other gerbil. Is there anything i can do, like should i put him back in the cage with the other living gerbil, or feed him something else? please help.

Asked by the poodleo 7 years ago


How to make LED driver out of CFL components? Answered

I got some CFL parts like transformers, transistors, capacitors, etc. How do I make a (simple) LED driver to make an LED light bulb using the CFL components? I was thinking of a capacitive dropper power supply but the CFLs also had transformers so I could use those. Too bad the internet doesn't have much info of using CFL parts to make an LED bulb. Because when people get a CFL base to make an LED light bulb, they could just as well use the CFL PCB parts too. If it helps, the two CFLs I took apart are a Commercial electric 14w reflector bulb and an (old) Lights of America 13w "The Bulb" bug light bulb.

Asked by poiihy 3 years ago


Melting Tin Alloy to make pendant jewelry

I've made several attempts to melt down a tin alloy metal (92% tin, 8% antimony) to make pendants; small pendants for necklaces. I haven't had any luck with this at all!  The mold has been cast - the metal has been chosen but...my process isn't working. I'm using a hot plate and a small teflon pan to melt the metal. The problems I'm running into are: Once I melt the alloy, I can't get it into the mold before it starts cooling.  It pours out too quickly from the pan, then cools too quick to finish pouring.  It's a small mold (1 3/4" diameter with 1/8" lines) which isn't helping I'm sure.  Not sure on a couple things I'm hoping somebody who know more about this than I do could possibly make some suggestions. I don't know if I should be using a flux to keep the metal clean because it is getting dirty after the melting. I don't know how to get it from the pan to the mold before it cools? Someone, I'd imagine, must have come out with a tool for transferring small amounts of metal to molds.  I tried a glass eye dropper today but didn't have any luck with the transfer process.  Not sure if a crucible and flux is the way to go or not. If so, does anybody know of a good company that has items designed for this type of work? Any and all help / info / suggestions would be greatly appreciated!!  Thank you

Posted by Vince11 2 years ago


Knex Ball machine Twister - TGKTR3 Entry - Now with video!

Wohoo!I finally finished my ball machine. Its by far my biggest build, eating thousands of pieces and many hours. I'm happy with the result though. It features a few larger elements, such as the "Yin Yang" as seen on KI, a switching element made of ball switchers, a large spiral bowl, a big arm dropper and a 2 stage element. All together it comes to over 90 feet of track!The other main part of this ball machine is the lift mechanism, called "switchers" (I think...)They are really cool. One of the drawbacks is that they require a fair bit of energy to work, so I had to gear my motors down t have enough torque. So its a bit slow, but I think its well worth it.But enough of my biased intro, have a look for yourself!Oh yeah, and thanks to The knex weasel, darth trainman, shadowman39, I used their ideas in this ball machine. Also thanks to Gortess, whom I borrowed a few pieces from.Other cool facts...Took a month and a bit to buildTook 2 hours to take apartUses 7000 piecesHas over 90 feet of track!Enjoy!The video has arrived! Sorry for the wait. Hope you enjoy it.Here's the direct link.http://www.youtube.com/watch?v=1b6WTZWN23Y I had to repost the video on a different account, so your comments/ratings are gone now, sorry. For anyone interested, there was 400 views when I took it down.

Posted by I_am_Canadian 9 years ago


Some advices on "self switcher circuit between battery & AC-DC ADAPTER power sources"

To put it shortly, I have small 12V 10A solar system (panels, car battery,  PWM charger, LEDs, car radio, car lighter (used for usb phone chargers etc) backed up with 12V 3A AC-DC adapter. They share common "ground" and outs connected in parallel but I dont want it to draw any power from AC adapter unless PWM controller shuts down power when battery gets empty. Anything below 500mah is neglible. I dont understand much about relays or microchips perhaps a relay design would be simpler and more efficient... So I tried to design a circuit with TIP33 transistor(because i found that it supports 10A continuous draw). but apparently it needs like 2V (max3) as Base-emitter voltage. if so, i need to add something between R1 and Adapter +12V and R4 and battery12V to reduce voltage to 2 volts... I have 3 questions 1st: is there any more efficient and relatively simple way to drop voltage withoutt leds? otherwise i will just use them as both indicators and voltage droppers since current will be lower than 20mah. 2nd: i am not sure if R2 and zener diode would be enough to let T2 draw all the current to keep TIP33 off while battery is on. perhaps i should remove R2 as well? 3rd: Since PWM and adapter both have reverse voltage and overload protection im planning to put a single diode to deny unnecessary current flow on R3 from battery.(i already removed the second one from design just before i write this here). i am thinking about putting resistor values to let only 30ma run there. Would that diode overheat while running on AC or drop voltage from adapter too much? R3=440 R1+R2=160 R4=anything depends on the T2(sth simple to handle 15-20mah C-E)

Asked by sailorondatea 4 years ago