Go to Post You are joining the greatest family in the world, FIRST, because we all strive to practice GP. - Ken Loyd [more]
Home
Go Back   Chief Delphi > Technical > Motors
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #39   Spotlight this post!  
Unread 06-02-2007, 14:56
dtengineering's Avatar
dtengineering dtengineering is offline
Teaching Teachers to Teach Tech
AKA: Jason Brett
no team (British Columbia FRC teams)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2004
Location: Vancouver, BC
Posts: 1,833
dtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond repute
Re: Banebot 56mm gearbox - double D - RELOADED

While the brazing may well reduce impact loading by reducing the amount of space for "play" in the Double D, and could serve as an emergency fix, I would suggest holding off on doing it for the moment, if you can.

I would be concerned about getting proper alignment of the carrier plate while brazing... yes, it can be done, but if it is done wrong you are deeper in the hole.

I share your concern about hardening... or softening... of the shaft. You don't want to weaken the shaft, yet at the same time you don't want to make it brittle. While I can't say for sure whether the brazing is likely to affect the shaft, or whether quenching would re-harden it, I agree with you that this is an unknown of no small concern.

I would be concerned that since the braze material is softer than the steel of the carrier plate that it will deform under static load, leaving you no further ahead than you were before brazing.

If a replacement carrier plate made of hardened steel becomes available it will likely be machined to fit the double-d of the shaft... which is now brazed into the old carrier plate.

I am hoping (rather anxiously now...) that the next team update from FIRST will address an official response to this problem, and that the official response will include replacement final stage carrier plates that will be available to all teams. (I am basing this on Dr. Joe's comments that everyone at FIRST and Banebots is working hard to address this issue and the high respect I have for the FIRST organization... I have no inside knowledge on which to base this.)

So if you've got a spare transmission on which to test this fix, I'd say sure... go for it... and let us know how it works. It just might work out okay, after all. But if you can still test drive your robot, despite increasing backlash, and have no spares, then I would suggest perhaps waiting a day or two before trying this fix.

The optimal solution does seem to be in getting some proper carrier plates manufactured and distributed to teams so that the gearboxes can do the job that they were specified to do. It shouldn't be that hard, nor that expensive, particularly if it is a co-ordinated response for all teams.

Jason
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Banebot 56mm gearbox - double D related Joe Johnson Motors 78 31-01-2007 23:55
small banebot motor with 64:1 gearbox burkey_turkey Motors 16 29-01-2007 01:48
Banebot Gearbox chris31 Technical Discussion 45 15-01-2007 17:56
Attempting to Cut BaneBot 56mm Shaft edthegeek Motors 6 15-01-2007 08:51
56mm BaneBot Gearbox 15tooth sprockets. Where to buy more? VEN Technical Discussion 4 11-01-2007 14:45


All times are GMT -5. The time now is 20:54.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi