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JimI8

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  • Huge DIY Concrete Face Garden Sculpture

    Not "anyone." I am never surprised when someone says "I cant do math" because some people are "Right Brained" and the needed connections just are not there. Its like being born with only one leg. You will never be a high jumper. So I am always surprised when someone says "anyone" can be a sculptor or a musician, or a painter. It just isnt true. I am "Left Brained". I can do calculations in advanced calculus, I can program computers, but at sculpting, I was born with only one leg. Saying, "cummom, jim, you can do it" doesnt change the fact that the wiring of my brain just is not there.

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  • How to 3D Print a Surfboard

    How much "air is inside" is immaterial. Its what is its total external volume (potential displacement) and what does it weigh.........LOL Neither need taking it out. Just have the computer measure the volume and then weigh the board on the bathroom scale, You could use compression and get more "air inside" but that would actually make it LESS boyant.

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  • How to 3D Print a Surfboard

    Before fiberglass, boards were wood. (Pre 1950) They were heavy and they were killers.. In those days you didnt tie yourself to the board by your ankle because you wanted to get away from the thing if you fell, deep and wide.......LOL. And the plastic boards are no less biodegradable than the modern Foam and Glass boards.

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  • How to 3D Print a Surfboard

    I haven't surfed since 1954. Now I want to make this and try it again. I was given a 3D printer awhile back and it has just set on the table ever since. I dont have to design this as you have already done it, So it will make a good beginner project, just lots of simple pieces. The challenge will be the assembly and fiber glassing. Since I recently built a cedar strip canoe with three quarter inch strips and fiber glassed it. I have the experience for that part. Now I am not sure if 66 years will have dulled my surfing abilities, but I did do some wind surfing about 30 years ago, so I know I can relearn that part.

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  • The Manned Octocopter Project

    I have been toying with the idea of doing something similar. Since the computer program is the same for ANY orthocopter I was thinking the controller out of my $12 copter would run a large one with some tweaking of the response times. and some relays to increase the current for the larger motors.

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  • JimI8 commented on gravitino's instructable The First Color Photograph

    While it was mentioned that the original experiment used black and white film, it was left un said that the film of the day was not sensitive to RED light, so the original experiment would have failed to produce a RED transparency. We all know that a red filter is used in the darkroom when processing B&W film. So how did it work? Was it a fraud? It turns out that the film WAS sensitive to infared radiation and the RED areas of the picture ALSO radiated in the infared range so it worked. Had the experimenter been carefull in his research he would have realised that the B&W film wasnt sensitive to RED and he would not have tried the experiment and it might have been many more years before we had color photography....LOL

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  • JimI8 commented on DrewPaulDesigns's instructable Easy Tesla Coil!

    Since its radiating in all directions it would take a full enclosure sphere to capture it all and then where are you....back at the start with the power supply contained within the receiver and no "wireless transmission" at all !!

    Your last sentence is "tongue in cheek" right?

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  • JimI8 commented on DrewPaulDesigns's instructable Easy Tesla Coil!

    I posted this in the wrong place so am reposting it here. It seems this is the new "darling" technology. But what everyone ALWAYS fails to mention is that, while it works, it isnt an efficient way to move power. Wires are much more efficient and in a world where wasting power requires oil resources,I would think the greenies would be against ti. Its like filling a glass with water from 10 feet away with a garden sprinkler. It takes a lot of water to fill that glass. Cute and a parlor trick but it wasnt useful when Tesla did it and it still isnt useful. Saying things like, "wireless transmission of power is an emerging technology with innumerable applications" is grossly misleading. $200 for a toy is expensive.

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  • Has anybody considered the effects of children ingesting this stuff. Personally I would not want my children playing with this.

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  • ATF and Acetone is a myth. They DONT mix. They are like oil and water and separate within seconds. Cant be done. I tried it and you just cant mix the two.

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  • I cannot support a stereotypical error on the part of "the rest of us" The object of an instructable is to "instruct" or educate. Accepting the incorrect nomenclature, calling it a Jack and not a Plug is inexcusable. IT IS A PLUG, instruct "the rest of us" and promote correct nomenclature.

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  • JimI8 commented on kirthik vasan's instructable Hot Ice

    You said, remove it from the refigerator but I dont see where you said put it into the refrigerator? Will the "ice" melt? when?

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  • JimI8 commented on Naran's instructable Cheapest Smart Home for $38

    Like TechnicalJohn says, need links to parts.

    You are assuming more knowledge than I have so I guess mine is less than zero...LOL1) Do the old smart phones need a contract for access????2) Can more than ONE smartphone be used for cameras simultaneously?3) Can a Raspberry 3 be used in place of the Zero??

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  • Mathematically it makes no sense that portrait orientation makes less power than landscape orientation. Can you explain that statement?

    OK, it still doesnt, electrically or mathematically, make sense to me....It has snowed ONCE in the past 105 years here.....LOL.

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  • This is very instructive and much can be learned from this project. BUT, I hope no one thinks this lock is of any value. This lock would not stop a determined toddler. To make this project more useful, a much better lock needs to be used.

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  • JimI8 commented on tanner_tech's instructable Simplest Geiger Counter

    Well, back in the day, we needed 350V for our plate supply so it wasnt considered high. 18 V for the filaments was considered low. Now the 1800V for the CRT plate was HIGH....LOL

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  • Thanks, lots of good information. One of my biggest complaints has been a lack of secs. No one mentions the load capability, or the run time, or the forward speed. All of which I am interested in.

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  • I am new to copters, but am an electronics engineer with many years of programing and bench time. However the terms and language of the hobby leave me mystified. This looks like the perfect project to get me started. Not so simple I dont learn anything, but not so complicated I will fail. But I need more details...or more knowledge. Can you point me to a book to get the basics of language and concept?What is the real cost of this project if I start with nothing but a clean bench and tools?

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  • The current capability of the relay is not specified but the size tells me it isnt a lot. However the relay could be used to activate a larger relay (Contactor) to control even a 5KW solar array as long as the coil demands of the contactor are within the capability of that small relay.

    Any design must take in account the worst case. If it doesnt it is bad engineering. However, I was NOT faulting this design, just commenting on how it could be used WITH a CONTACTOR to control larger current load such as what I have.As long as your MAXIMUM load does not exceed the 12 amps you say this relay can handle, then it will work fine.If the relay cannot handle the MAXIMUM possible charge is it going to fail very soon because when the relay clicks ON on a battery at 12V the starting spike will be at that maximum. My normal charge rate is often MORE THAN 50 AMPS. and maximum is 80 amps.

    Not true. The difference between 12Volts and 14.9 volts through the internal resistance of the specific battery will define the charge rate instantaneously when first connected. The better quality battery will have the lowest internal resistance and the highest charge current. It can get very high. Much more than the published charge rate. And it only has to last a few milliseconds to destroy the relay contacts.Further charging at only the float rate means you are not using your battery bank efficiently. It should be constantly moving over a range to get the best usage from it. Mine is often under 100 amp discharge.....which is often coming directly from the solar panels.

    My home array has 10 panels, each one capable of 8 Amps for a total of 80 amps.

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  • First instructable that I ever liked enough to download. Good job.

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  • JimI8 commented on tanner_tech's instructable Simplest Geiger Counter

    Well, I wasnt trying to be a smartass, just saying that the new version of Hi Voltage wasnt the way I learned it when Tubes were king.. I have been hit by 25,000v and it knocked me across the room and I bit my tongue, but I survived....shaken...LOL

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  • JimI8 commented on tanner_tech's instructable Simplest Geiger Counter

    Finally an Instructable that really tells how to build something. Most of these are just instructions on how to assemble a box full of parts bought from a vendor complete. This is actually building something from scratch. Good Job and well explained without going into too much electronics detail.I am old school, 500 volts is not "high voltage". 2000 Volts IS high voltage. LOL

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  • More specifications are needed. am talking about a sheet ofsteel about 1/16" thick. It was hardened before the serial number was stamped with a "letter" punch and then discovered that the steel punches wont even mark it. I could reheat it to redhot and draw out the temper, cool it, stamp the number on it, then re harden it. This would be a long process for each one. I need to etch a serial number to ATFE specifications.

    I want to engrave METAL I just dont consider "cutting paper" to be "Engraving". What would I need to engrave serial numbers into a steel product?

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  • All the comments that it is dangerous are just foolish. The current is not there to hurt you. The comments that it is illegal are equally foolish. My flight instructor once told me that, "you can land inverted, on the main runway, IF IT IS AN EMERGENCY." And that is what this article specified in the beginning. As to theft of services...I dont think so, you are paying for the service. If its an emergency, that wouldn't even be the case if you were not paying for the service. The diode will only stop one half of the ring tone, the other half will go through but it wouldnt get to the phone because the regulator would either turn it to 5 volts or would blow out, protecting the phone. The blown 7805 costs less than a dollar. I just wish people who are not qualified to asses…

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    All the comments that it is dangerous are just foolish. The current is not there to hurt you. The comments that it is illegal are equally foolish. My flight instructor once told me that, "you can land inverted, on the main runway, IF IT IS AN EMERGENCY." And that is what this article specified in the beginning. As to theft of services...I dont think so, you are paying for the service. If its an emergency, that wouldn't even be the case if you were not paying for the service. The diode will only stop one half of the ring tone, the other half will go through but it wouldnt get to the phone because the regulator would either turn it to 5 volts or would blow out, protecting the phone. The blown 7805 costs less than a dollar. I just wish people who are not qualified to asses the circuit would keep their mouths shut until they finish a course on electronics.

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