Rules on metal casters

[Jeff Pahl]

Originally Posted by S.Nickens

McMaster Carr and M.S.C. both carry nylon ball casters (a.k.a. ball transfers ) in 1" dia. for less than $20 with a load cap. of 100#s. Do a search for "ball castors". Good luck!

Thanks! I had not thought to look on McMaster Carr (that's what happens when a EE is doing the shopping). They have several kinds and sizes. I've looked repeatedly on MSC and can only find metal ones. Looks like we'll be ordering some from McMaster if FIRST comes back and answers the question in the negative.

[Wayne Doenges]

FIRST finally answered the question. Here is their response;

Q: <R27> states "Traction devices may not have surface features such as metal" We would like to use a roller ball castor with a metal ball and do not consider this a traction device since it is a castor, may we use such a device?

A: Yes. We define / clarify traction devices as those which provide a driving force or restraining force. The intent of this rule is to attempt to avoid carpet damage. The metal castor ball would not be considered a traction device and would be allowed.

Yippeeeee

Wayne Doenges
CAD Mentor