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Knightrous
Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
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quote:
Originally posted by Nick:
Why not go with two larger, wider gears? Much easier to make and more compact.
MOD1 or MOD1.25 gears from SDPSI didn't come in the ratios I was looking for, and I need this gearbox to be an inline solution, no offset output. The box is 2 stages of 1:1.4. I was originally going to double the gears up on the second stage, but it ended up making the gearbox too long, so I came up with the above solution. Gearbox is 80mm long, 70mm tall and 50mm thick (shaft not included). I could reduce the thickness if I machine all the bosses off the gears and keyway them to the shafts, might be something I do in the future with the mill and some new tools.
Hopefully it should hold up, if not, I'll design something else
quote:
Originally posted by Valen:
I wonder if rather than trying to accelerate and decelerate a motor, it might be easier to apply a brake to the motor. (mechanical or electrical)
Just something to think about
I've thought about that before, but never really gone much further into it because it's just 10x easier to pulse it. Anguz and I have a melty brain chat on msn and we discussed using a h-bridge for the braking and pulsing side of things. Big problem is I'm not aware of any small 25A h-bridges that handle 40v and are small enough to use (I don't want to have to put a Victor in there!).
I've had other crazy ideas with using 1 big brushless that drives two wheels and the opposite wheel is speed controlled via an electronic differential, similar to FireStorm's drive but it just complicates things damn fast _________________ https://www.halfdonethings.com/
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Fri Jun 12, 2009 8:15 am |
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Knightrous
Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
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@Nick:Never thought of the P80 boxes, ratios will probably be wrong for me though.. I need a 1:2 gear ratio, I'm gearing the scooter motor up, not down. Good suggestion though, I might consider those if I ever make up some small boxes for scooter motors in the future. Always like the prospect of a scooter motor with a compact 4:1 gearbox on it instead of the annoying belts
This gearbox will cost me about $100 all up once I get all the parts, and building my own gearboxes is rather rewarding from a personal perspective. My Ionboxes for Schmackhed (as rough as they were) worked well, till I started breaking the drill internals. It was a fun experience making them too, had to think outside the box to machine square billet with a 3-jaw chuck
@Trent: Ended up getting the M150, still waiting for hafco to deliver it though, paid for it two weeks ago Think I'll spend my next tax check on a bunch of tools for it, or maybe an Ebay Tig welder. _________________ https://www.halfdonethings.com/
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Fri Jun 12, 2009 11:31 am |
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