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Originally Posted by sanddrag
Rather than creating a new thread, I'll post here. We are using a fisher price and Dewalt tranny. Is it backdriveable from the factory? If not, how do we make it backdriveable? Does doing so have any bad event on robustness or anything?
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If you leave the 5 rollers (or any 1 of the 5) in the front end of the transmission, it will not be backdriveable.
I have had an experience where the outside ring of the transmission cracked and the no-backdrive feature failed. Notice it is not the RING GEAR that cracked but a special ring made to provide the no-back feature required for a keyless chuck. The transmission still worked, it just did not remain in place after power failure.
It was definitely a high stress application and it only failed once (and I think that Dewalt subsequently changed the design of the ring to reduce a stress riser in the part -- if memory serve me well), but it did fail.
It can cause your feedback loops to go into fits if you leave them in, especially with large arms that are not well counter balanced.
Bottom Line: if I can, I take them out.
Joe J.