Go to Post Team 1114 does not design or build ROBOTS. They build AWESOME. - DonRotolo [more]
Home
Go Back   Chief Delphi > FIRST > Robot Showcase
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
  #15   Spotlight this post!  
Unread 18-11-2013, 20:49
sanelss sanelss is offline
Registered User
FRC #1658
 
Join Date: Dec 2012
Location: saint louis
Posts: 258
sanelss is a splendid one to beholdsanelss is a splendid one to beholdsanelss is a splendid one to beholdsanelss is a splendid one to beholdsanelss is a splendid one to beholdsanelss is a splendid one to behold
Re: Prototype transmission for potential use this year

Quote:
Originally Posted by magnets View Post
Neat idea. However, I am fairly certain that your worm wheel will loose teeth when you have the weight of the robot behind it. If your robot is going fast, and suddenly you stop applying power, the worm wheel won't be to turn the worm gear, so you'll just snap a tooth off. It will be different than just testing it on a table.

In the video you talked about having to use a smaller worm wheel in order to get the same reduction. These are pretty fragile, so you could switch to a bigger worm wheel with a two-start worm.

A few other recommendations. Be sure to lubricate your gears! Make sure there isn't any play sliding the worm or worm wheel up and down on their shafts and that the unsupported drive axle doesn't wiggle around, but a little play in rotating the gears (like you showed in the video) is really important. That backlash makes the transmission operate more smoothly, and helps with lubrication, especially when you're using gear like this, than "slide" instead of "roll" on each other.

oh indeed we are aware bench tests are different. Hence why we are prototyping. The sudden stop may or may not be an issue, we don't know. If it is, we can address it by having programmed coast made to prevent such an instance or at least minimize the sudden load. Hell at full speed our robot may topple itself over even! For robot impacts we have bumpers so with those two things in mind I think we will be fine. But we will be testing for it in the upcoming weeks.

Not sure what you're talking about using smaller worm. We didn't need to do such a thing at all, we had to use smaller wheels or we wouldn't have enough torque and we would load the cims too much so we had to use a smaller wheel. Also these worms are already 2 start.

I was thinking aboud greasing them, it would help reduce the contact friction but would also make a mess =\ And yup there's absolutely zero vertical movement on the worm. Everything was spaced down to 0.001 of an inch. Being wedged between a thrust bearing and roller bearing on the other side it's got absolutely no where to go(unless it destroys the roller bearing, but that can be addressed if it happens)
 


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


All times are GMT -5. The time now is 23:09.

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