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Re: gear ratios
No offense to Team 11, but I wouldn't use 5/16" bearings/shafts. It just isn't as standard a size as 3/8" or 1/2" or 5/8". a 5/16" also shaft might not be strong enough for some drive systems that have tons of torque.
$0.02 Cory |
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that line up with the two flats on the case of the drill motor. The motor slides into the mount shaft first and bottoms out on the mount face. The face of the mount is .625 wide with a .75 dia. thru bore. We drill and tapped two 1/4-20 holes on each side of the .75 bore and bolted the mount to the inside of the chassis side plate. Here's a link to one of our team photo sites which has some good pics. http://f2.pg.photos.yahoo.com/ph/berserker717/my_photos go to build 2001 |
Re: gear ratios
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For the question on how the drill motor is mounted to the gearbox plate, there is a thread on that in the Technical forum, called "mounting the drill motor". Might help. Also, the shaft of the drill motor is a 5 mm shaft. What you do to get a press fit into the new gear, you cut a hole about 0.001" smaller. Yea... if you calculate that, you would have to cut a .1955" hole. That is a really random size, BUT, you can find reamers that size. A reamer is a special cutter that brings a hole to the exact size you want it. You cut a guide hole about 5-10 thousandths smaller and use a reamer. I haven't replaced the pinion on the drill motor ever, since I use .7 mod gears to mate with it. But, I have replaced the pinion on the Fischer Price motor. What I do is I press off the gear, and press on a .25" shaft with the press hole in it, also a small flat on one side. That way, I just order a .7 mod gear off PIC Design and use the set screw that comes on it, as well as the original bore. That way I can easily change the gear on the motor, say if it breaks or the design changes. Presto, literally. (bad pun) As for the origninal topic of gear ratios, here are some free load rpms: drill: 19670 CIM: 5342 FP: 15000 If you want to join the Drill and the CIM, I suggest keeping the drill motor's pinion. To mate it, just use the CIM's keyed shaft. It's an 8 mm shaft with a 2 mm keyway. Just order a .7 mod gear on PIC, bore and key it, and its done. By the way, the 56 tooth .7 mod mates them to 1.4% error. Not bad, not bad at all. That's what I use. To be more exact, go try to find a 55 tooth. Good luck :P. Here's a pic for Sanddrag on how I got a new gear on the FP motor: |
Re: gear ratios
I really appreciate u guys helping. I have decided to use the CIM(9:9) and the drill, no gearbox(32:9) I don't want to see another drill gearbox again :mad: all i have to do is figure out how to mount the drill and the sprockets to the motor shafts and i will be done. i will post pics when i am done in a week or so.
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Re: gear ratios
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