pic: Prototype Drivetrain v2

[EricH]

Originally Posted by 548swimmer

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]

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

[548swimmer]

Originally Posted by Hawiian Cadder

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

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]

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]

Originally Posted by Jack Jones

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]

Originally Posted by Jack Jones

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]

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

[548swimmer]

Originally Posted by sdcantrell56

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]

Originally Posted by Jack Jones

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]

Originally Posted by 548swimmer

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

If you say so.

[548swimmer]

Originally Posted by Jack Jones

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]

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]

Originally Posted by EricH

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]

*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]

Originally Posted by EricH

*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