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Old Jan 05, 2002, 03:16 PM
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United States, OH, Dublin
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Building your own gearbox?

Does anybody know where i can obtin some gears to build my own GB? i need at least some 2 and 3mm pinion gears.

thanks
keith
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Old Jan 05, 2002, 08:09 PM
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Aloha, Oregon in the Good 'ol USofA
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Try this: http://www.smallparts.com/

R/L
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Old Jan 06, 2002, 02:08 PM
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I have asked this question several times in the past month or two, and no one seems to respond at all. I don't know if it has ever been done before. I think the GB's available are limited in ratio and most are of marginal durability. So, if you find instruction, materials or supplies, please let me know.
I thought, since I don't have a machine shop, fiberglass or plex could hold it together. RC car pinions and gears would work for the gears and they're cheap, with unlimited ratios. The prop shaft connection to the spur gear is the only hang up. Let me know what you come up with.
Thanks,
Rick
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Old Jan 06, 2002, 02:47 PM
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rsieminski,

if you go and look on the parflyer forum there is some more info. there. I also posted this question there.

-keith
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Old Jan 06, 2002, 04:54 PM
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You guys are right - there is no one comprehensive source for parts for homemade gearboxes. www.homefly.com and www.toddsmodels.com are two sources of small gears and bearings. You can get hardened 2mm shafts and 8T metal pinions for 2mm shafts from www.hobbypeople.net. Here are a couple of boxes I came up with, but they both relied in part on machined aluminum pieces, either from a friend, or another gearbox.

Tony Turley
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Old Jan 06, 2002, 05:03 PM
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I've got a couple of images of home made boxes that were made with the pivot from the read-write head arm of hard drives, (man, I got a find an easier description!)
I'll try to post two but the 'Zone doesn't usually allow two images with one post.
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Old Jan 06, 2002, 05:10 PM
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Old Jan 06, 2002, 11:38 PM
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The best site I've found for gears and pulleys is http://www.sdp-si.com/. They've got a good selection and ship quickly.

Dave
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Old Jan 06, 2002, 11:48 PM
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Try your LHS, and ask to see the gears for RC cars and trucks. I know they sell gears and bearings in our size, depending on what ratio you want. I also thought about making a belt drive. I think the hardest part will be the box to mount you gears/belts into.
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Old Jan 07, 2002, 11:28 PM
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Any ideas on how to mount the spur gear of a car to a small enough shaft? They have a huge hole in them.

Rick
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Old Jan 08, 2002, 12:25 AM
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The pinions I was looking at would fit a Mag. Mayhem. I think they were from Traxxas, and were in the 20-23 tooth range. As far as the spurs, I am lucky enough to have my own lathe, so I could just machine a shaft that would fit.
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Old Jan 08, 2002, 07:52 AM
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Perfect ~$4 each for pinion and spur (you could even use the quiet 32 pitch) ~3 for screws and plex at Home d. and a milled shaft courtesy of iflyelectric. An infinate amt of ratios to chose from. Perfect!

If you have any luck milling the shaft, put me down for 1 or 10, I'll build the GB around it. I've been thinking about this for a long time now.

Thanks,
Rick
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Old Jan 11, 2002, 12:22 AM
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I will be going to my LHS tomorrow and ask the car guy what gears I could use for the spur gear. I need to find one that has a relatively small mounting hole. Most of the ones I have seen have at least a 1/2" diameter. If I mill a shaft that large, it would be too heavy, and expensive. I will keep you posted.
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Old Jan 11, 2002, 04:51 PM
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Brier, WA
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Gear Box parts

A few years ago I biult a home made gear box for a Kyosho DCM20BB motor, 2mm shaft, using an article in Model Airplane news (I think, I still have the Mag if you want to know the exact issue and such). I found all that I needed at a LHS for slot cars. I got shafts, gears, and bearings that worked quite well but were a little expensive. All I had to do is cut out 2 aluminum supports to bolt to each end of the motor and house the bearings for the drive shaft. A few wheel collars and cut some threads on the shaft and I was done. This ended up with a 6/1 ratio and 1.4 oz total weight and works well with six cells up to 5 amps.
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