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Unread 08-02-2016, 14:00
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3D Printing Specialist
AKA: Bradley Rigdon
FRC #0222 (The Tigertrons)
Team Role: Mentor
 
Join Date: Sep 2001
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Re: pic: 222 VexRhino Drive

Quote:
Originally Posted by Skywalkar View Post
Looks like you've got more than an inch of travel on those slots up front; do you think that VersaBlock tensioning may have been insufficient for this application?
We added extra length to the slots for ease of track removal.

We tried VersaBlocks on our proof of concept, but I was unhappy.

Too many problems so we created a better solution

Problems with them:

They are about the same size of the pulleys and could cause problems with going over obstacles, etc.

Hard to tension evenly and accurately. (One mentor holding the frame, another mentor to pull the tension, and another mentor to lock the tension.)

Additional complexity. You'd need bearings all over. (Two in the pulley and four in the VersaBlocks)

They did not fit my space requirement to keep the rails as compact in width as possible. (The rails are 3 inches wide internally.)

Chance of pulley not being perpendicular to the frame due to different tensions on each side of axle.

We created an aluminum plug to insert into the 2x1 extrusion. It has two threads at the end to "tension" the belt against the edge of the 2x1 and two bolts on the outside of the 2x1 to lock the tension in place.



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Last edited by team222badbrad : 08-02-2016 at 14:06.
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