10-04-2008 17:16

Aren_Hill

Re: pic: FRC 1771 Swerve Module

that looks familiar.....

10-04-2008 18:50

sdcantrell56

Re: pic: FRC 1771 Swerve Module

It is somewhat similar. The big difference would be in how ours is all assembled by bolts or rivets versus yours is welded. Im working on a new revision now. How are you keying your wheels. Im planning on making wheels like that for next year.

10-04-2008 18:52

Aren_Hill

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by sdcantrell56 It is somewhat similar. The big difference would be in how ours is all assembled by bolts or rivets versus yours is welded. Im working on a new revision now. How are you keying your wheels. Im planning on making wheels like that for next year.

10-04-2008 19:43

sdcantrell56

Re: pic: FRC 1771 Swerve Module

Cool. Specifically what is on the wheel to take the hex shaft. Look for the second revision in a little bit

10-04-2008 20:21

Aren_Hill

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by sdcantrell56 Cool. Specifically what is on the wheel to take the hex shaft. Look for the second revision in a little bit

10-04-2008 21:34

Akash Rastogi

Re: pic: FRC 1771 Swerve Module

sorry to be a total noob, but what motor do u use to drive? or any drawing of the inside or an exploded view would be awesome. Thanks.

10-04-2008 21:50

hillale

Re: pic: FRC 1771 Swerve Module

they use the cims in the other chassis picture with chain travelling to the modules to drive the wheels. Inside, there are just bevel gears going from the vertical shaft to the shaft the higher side sprocket is mounted on.

11-04-2008 01:45

Ice Berg

Re: pic: FRC 1771 Swerve Module

I'm considering a swerve drive for next year, but I've been having trouble finding hex shaft and sprockets that match. The only place I really know to look is McMaster. Where did you guys get yours?

11-04-2008 08:54

hillale

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by Ice Berg I'm considering a swerve drive for next year, but I've been having trouble finding hex shaft and sprockets that match. The only place I really know to look is McMaster. Where did you guys get yours?

11-04-2008 13:29

sdcantrell56

Re: pic: FRC 1771 Swerve Module

I am using 2 cims into a custom gearbox per side. It is a single speed transmission. Also the best way to get sprockets to match hex is to buy plain dore sprockets and broach them into a hex. Hex stock shaft is very cheap and can be bought at mcmaster.

11-04-2008 13:32

AdamHeard

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by sdcantrell56 I am using 2 cims into a custom gearbox per side. It is a single speed transmission. Also the best way to get sprockets to match hex is to buy plain dore sprockets and broach them into a hex. Hex stock shaft is very cheap and can be bought at mcmaster.

11-04-2008 13:37

sdcantrell56

Re: pic: FRC 1771 Swerve Module

Is 7068 or 7075 really necessary for a hex shaft that is short in length and supported on both ends. I would think that it would be plenty strong enough since you dont have to worry about a keyway.

11-04-2008 16:28

AdamHeard

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by sdcantrell56 Is 7068 or 7075 really necessary for a hex shaft that is short in length and supported on both ends. I would think that it would be plenty strong enough since you dont have to worry about a keyway.

12-04-2008 00:14

Ice Berg

Re: pic: FRC 1771 Swerve Module

In the picture above, of the module with a blue wheel, I was wondering how those sprockets drive the shafts. It doesn't look too me like they're hex, or keyed.

12-04-2008 00:33

Aren_Hill

Re: pic: FRC 1771 Swerve Module

Quote:

Originally Posted by Ice Berg In the picture above, of the module with a blue wheel, I was wondering how those sprockets drive the shafts. It doesn't look too me like they're hex, or keyed.

13-04-2008 00:09

Ice Berg

Re: pic: FRC 1771 Swerve Module

Well, my team doesn't have the machining capabilities to make a shaft like that, however, I thought about it and I think I've found a simpler solution in terms of machining. Instead of lathing anything on the hex shaft, we would use a 3/8" shaft all the way through, and where we needed bearings (on either side of the module) we would make a sort of bushing whose inside would be broached to a 3/8" hex, and whose outside would be a 5/8" dia. circle. This way we could put a hex shaft through the center and use a 5/8" bearing around the outside, and snap-rings to hold it all in place.

13-04-2008 00:36

sdcantrell56

Re: pic: FRC 1771 Swerve Module

That method would definitely work although bigger bearings are more expensive and its heavier but if thats how you have to do it then by all means use that method. It will definitely work and would be less labor intensive.