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-   -   pic: Prototype Drivetrain v2 (http://www.chiefdelphi.com/forums/showthread.php?t=85728)

EricH 09-05-2010 22:17

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by 548swimmer (Post 961124)
Yeah, I realized that after I posted. How would these work in this situation? If they tension, how do you get them in? Do they allow for the variable chain lengths?

Note that they're rubber. You put them into the chain like a sprocket. If you're careful about it, you can arrange for them to be slightly compressed (which you couldn't do with a normal sprocket) when the suspension is at "neutral" position (where it would normally be while sitting there, and the longest distance/flattest chain). Then it would force the chain to "shorten" when it got the chance, like when the suspension moved.

Hawiian Cadder 09-05-2010 22:19

Re: pic: Prototype Drivetrain v2
 
woah, if that only weighs 30 lbs then something is wrong, a cim in a 1-12 bane bots gear box weighs 12 lbs, there is no way 2 cims and the whole rest of that is under 6 lbs:ahh: :ahh:

548swimmer 09-05-2010 22:25

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by Hawiian Cadder (Post 961268)
woah, if that only weighs 30 lbs then something is wrong, a cim in a 1-12 bane bots gear box weighs 12 lbs, there is no way 2 cims and the whole rest of that is under 6 lbs:ahh: :ahh:

I'll check my materials tomorrow. Thanks for catching that.

There is also a new post with the tensioning solution for you guys to look at.

Jack Jones 09-05-2010 23:30

Re: pic: Prototype Drivetrain v2
 
Quote:

I'm not sure how to power the omni's when they're in a suspension.
Lengthen the omni wheel swing arms and pivot them on the center drive axels. That way the distance between centers remains constant as the arms rotate. Use slot mounted dead axels on the omnis to tension the chains.

Confucius say: Man who think physics is religion must sit in own pew. ;)

548swimmer 09-05-2010 23:40

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by Jack Jones (Post 961289)
Lengthen the omni wheel swing arms and pivot them on the center drive axels. That way the distance between centers remains constant as the arms rotate. Use slot mounted dead axels on the omnis to tension the chains.

Confucius say: Man who think physics is religion must sit in own pew. ;)

Physics explains more than Christianity, but let's not get into that.

http://www.chiefdelphi.com/media/photos/35715?

Already got the tensioning down. I prayed to the physics gods, and they answered!!

sdcantrell56 10-05-2010 00:26

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by Jack Jones (Post 961289)
Lengthen the omni wheel swing arms and pivot them on the center drive axels. That way the distance between centers remains constant as the arms rotate. Use slot mounted dead axels on the omnis to tension the chains.

Confucius say: Man who think physics is religion must sit in own pew. ;)

Better yet, remove the suspension as it is a solution to a nonexistent problem and greatly complicates things as well as adds more points of failure. There is a lot to be said for simple well thought out designs. Look at any drivetrain from 254/968 for inspiration

548swimmer 10-05-2010 00:33

Re: pic: Prototype Drivetrain v2
 
http://www.chiefdelphi.com/media/photos/35715?

548swimmer 10-05-2010 00:34

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by sdcantrell56 (Post 961300)
Better yet, remove the suspension as it is a solution to a nonexistent problem and greatly complicates things as well as adds more points of failure. There is a lot to be said for simple well thought out designs. Look at any drivetrain from 254/968 for inspiration

I got everything working smoothly in the latest version. Check it out.

548swimmer 10-05-2010 00:35

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by Jack Jones (Post 961289)
Lengthen the omni wheel swing arms and pivot them on the center drive axels. That way the distance between centers remains constant as the arms rotate. Use slot mounted dead axels on the omnis to tension the chains.

Confucius say: Man who think physics is religion must sit in own pew. ;)

There is no good way for 2 arms to mount on one axle evenly though.

Jack Jones 10-05-2010 06:26

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by 548swimmer (Post 961305)
There is no good way for 2 arms to mount on one axle evenly though.

If you say so.

548swimmer 10-05-2010 11:01

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by Jack Jones (Post 961319)
If you say so.

I do not see a goo way to accomplish this. If you have any ideas as to how this would work, please let me know because I am eager to expand my knowledge.

EricH 10-05-2010 21:16

Re: pic: Prototype Drivetrain v2
 
You could do a dovetail mount. It would take some machining, but it would probably work. Something like the image below (= is the axle).

__ __
=| ||=|| |=

548swimmer 10-05-2010 22:24

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by EricH (Post 961478)
You could do a dovetail mount. It would take some machining, but it would probably work. Something like the image below (= is the axle).

__ __
=| ||=|| |=

I'm not sure how a dovetail mount would work here. Could you do a quick mock-up in mspaint or an equivalent? I also believe I solved he problem with v2.1. Thanks for the idea, I can't wait till I fully understand it!

EricH 10-05-2010 23:29

Re: pic: Prototype Drivetrain v2
 
*curses at VB's not putting spaces in right*

If you've ever seen a dovetail joint, it should be fairly simple to figure out. Look at a standard door hinge; that's a fairly common dovetail application. Now replace the pin with an axle, and the screw plates with swing arms. You'd need to change the geometry and check the stresses, but that's pretty simple to do.

548swimmer 10-05-2010 23:45

Re: pic: Prototype Drivetrain v2
 
Quote:

Originally Posted by EricH (Post 961512)
*curses at VB's not putting spaces in right*

If you've ever seen a dovetail joint, it should be fairly simple to figure out. Look at a standard door hinge; that's a fairly common dovetail application. Now replace the pin with an axle, and the screw plates with swing arms. You'd need to change the geometry and check the stresses, but that's pretty simple to do.

Door hinges aren't dovetails, are they? I always thought dovetails looked like this:

/_\ or \_/-\_/-\_/ with the dashed part cutout and bottom line at the top


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