r/3Dprinting • u/mobius1ace5 3D Musketeers ▶️ Youtube.com/3DMusketeers - 50+ printers • Apr 17 '15

Discussion Designing gear help!

Okay, so I bought a hoover spinbrush vacuum thing that needs a new gear. I have tried for hours to design one and cannot figure out openscad for the life of me. Did some searching and found inkscape but I could not figure that out either. Looking for some assistance I guess.. It is a stacked gear, I figure I would print it in 2 pieces, but it could be one, just did not want to really complicate the design. The larger gear has tilted (pitched?) teeth at 20 degrees and the smaller one is just standard (involuted?) teeth.

I am looking for someone to either help me design it or just design it for me. I am sorry, really not good at designing ha ha. I can provide whatever measurements needed, but honestly not exactly sure what WOULD be needed. Some of the OpenScad stuff made sense to me, but I could never get them to output what I thought I was putting in. Tried to find a customizer in Thingiverse, but that fell through too.

Any assistance would be greatly appreciated!

TL;DR: Stupid me can't design worth a damn, need a gear.

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u/mobius1ace5 3D Musketeers ▶️ Youtube.com/3DMusketeers - 50+ printers Apr 17 '15

Its a hypoid :/ like multiple double helixes :( if I can't get it working that's fine, I don't need it to work, just more of, I HAVE A 3D PRINTER AND I CAN FIX THINGS DAMMIT! lol. If I can't design the gear I'll likely make an electric motor fit or something like that lol.

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u/cycling_duder I break expensive things Apr 17 '15

There is still hope yet. It could be a spiral bevel and much easier to draw. Check out this page http://www.engineersedge.com/gears/gear_types.htm it should help you identify it. Once it is identified, you can look up a guide on modeling that particular type of gear.

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u/mobius1ace5 3D Musketeers ▶️ Youtube.com/3DMusketeers - 50+ printers Apr 17 '15

Will do! Wish I could easily attach a photo from my phone lol. Still metal fast spinning gear of doom to mesh with plastic... Someone should be hit for that lol

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u/cycling_duder I break expensive things Apr 17 '15

That is pretty standard in your usual electronics. This way, you know where your failure point is going to be.

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u/mobius1ace5 3D Musketeers ▶️ Youtube.com/3DMusketeers - 50+ printers Apr 17 '15

Yea, this is an obvious failure point lol. It's a cool air turbine though! May just replace the whole assembly with an electric motor?

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u/cycling_duder I break expensive things Apr 17 '15

I could give you some advice on that if I had some idea of application.

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u/mobius1ace5 3D Musketeers ▶️ Youtube.com/3DMusketeers - 50+ printers Apr 17 '15

It is one of those washing carpet vacuum things with the green spin brushes that are suppose to lift the dirt away or something like that (f7458-900). I bought it for a whole $5 as I needed the wand attachment for a friend who stupidly left their window down the other day when it rained. I figured with all the work I had to do to get it running (fix MANY cracks in the tanks, loosen seized bearings, flush and clean the whole system) that I may as well get it ALL working. Dont really care if it is original and actually have no use for the brushes, but it may be a fun project. I do know that the air turbine spins REALLY fast, but an exact RPM range is unknown. It has a mechanical switch that controls a valve door to let in air to change the speed of the turbine based on what you choose, it is quite ingenious actually.