08-18-2010 11:28 AM

ttldomination

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

If I may ask, which program did you use to make this? And did you use a special feature to make the chains?

- Sunny

08-18-2010 12:01 PM

Al Skierkiewicz

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Clem,
A very nice drawing, you sure are getting the hang of using Inventor. Do you have an exploded view worked out yet? Keep up the good work!

08-18-2010 02:34 PM

Chris is me

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

I like a lot of things about your modules this year. Two chain reductions instead of a transmission, the triangle gussets on the sides of the module for stability, the dead axle with extra nuts instead of spacers at the bottom, and using an axle as a structural member of your module. Nice job!

08-18-2010 02:52 PM

AdamHeard

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Is that #25 or #35 chain?

08-18-2010 07:29 PM

jspatz1

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

I am very surprised that you did not have trouble with the cantilevered side-load on the Denso motor shaft. The worm gear in that motor is a plastic gear captured only by the thin sheetmetal lid on the housing, and is not designed for any side-load whatsoever. You might want to consider supporting the end of that sprocket if you can. We have found that a 5/8" OD ball bearing fits nicely into the center hole of the plastic Denso adapter to provide end support.
I very much like the chain reductions and overall design of your module. Very similar to our own.

08-19-2010 08:10 AM

Gdeaver

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Inventor was used to model the whole robot. The chains are #35. We have not had any problems with the steering motors from the sprocket not being supported on 2 sides. We have had major problems with the Denso window motors. The locking pins caused some serious drag when not run at full speed. We removed the locking pins and the denso motors worked much better in this steering application. Even with the pins removed, we had random motor shut down. We removed the jags and substituted victors. Since we went to victors we have not had any problems with the Denso units. Denso and jags do not mix. The over all design has worked very well. However we are working on several design tweeks in the off season. One thing that gave us problem were set screws constantly loosening. The next iteration will not rely on sets screws.

08-19-2010 08:39 AM

Brandon Holley

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Gdeaver One thing that gave us problem were set screws constantly loosening. The next iteration will not rely on sets screws.

08-19-2010 09:12 AM

Alan Anderson

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Gdeaver Denso and jags do not mix.

08-19-2010 11:04 AM

Siri

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Alan Anderson That observation seems worthy of a tangential discussion. We haven't used window motors for anything lately, so I can't comment, but I'm very curious. Are there any other teams out there who had a similar (or contradictory) experience using them with Jaguars?

08-19-2010 11:05 AM

Gdeaver

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

There is a thread on the Jag and Denso problem.
http://www.chiefdelphi.com/forums/sh...ad.php?t=83973
We have not responded to this thread since removing the locking pins. Even with the locking pins removed, we experienced random Denso shut down. For IRI we swapped out the jags for victors and the problem has disappeared. The window motors are great without the locking pins and victors. We have no hard data to help with why the Denso's overheat while under very light load with the jags. I think it has something to do with the high switching frequency of the jags interacting with the PTC causing it to self heat. I would like to see First allow the removal of the locking pins. Its easy and improves the performance of the motors. However, The bypassing or removing the PTC is much more questionable. It's an actual modification of the motor. So if you use the window motors, use victors.

08-19-2010 02:59 PM

AdamHeard

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Gdeaver Inventor was used to model the whole robot. The chains are #35. We have not had any problems with the steering motors from the sprocket not being supported on 2 sides. We have had major problems with the Denso window motors. The locking pins caused some serious drag when not run at full speed. We removed the locking pins and the denso motors worked much better in this steering application. Even with the pins removed, we had random motor shut down. We removed the jags and substituted victors. Since we went to victors we have not had any problems with the Denso units. Denso and jags do not mix. The over all design has worked very well. However we are working on several design tweeks in the off season. One thing that gave us problem were set screws constantly loosening. The next iteration will not rely on sets screws.

08-19-2010 04:33 PM

Alan Anderson

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Gdeaver There is a thread on the Jag and Denso problem. http://www.chiefdelphi.com/forums/sh...ad.php?t=83973

08-19-2010 09:39 PM

Clem1640

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

We have not had any problems with the cantilever loading on the window motor sprocket. We are still using the original (4) window motors after (6) competitions (on & off-season) and (4) demos. We've got (L&R) spares, but have not needed to replace any originals yet.

We embed a magnet in the end of the sprocket. A Cherry absolute magnetic encoder is mounted on the plate below the sprocket. This encoder provides information on the sprocket angle and (since the drive sprocket on the motor and the driven sprocket on the pivot are both 15T) therefore the pivot angle. This makes mounting the bottom end of the drive sprocket problematic.

Regarding building chains in Inventor, I have a process which works well (albeit a little tedious). I will write this up (it'll be short).

08-20-2010 03:44 AM

Aren_Hill

Re: pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

Quote:

Originally Posted by Clem1640 Regarding building chains in Inventor, I have a process which works well (albeit a little tedious). I will write this up (it'll be short).