Gene,
Although they are often called "thread protectors" , I prefer to call
them adapter pushers.
I have found that their most important function is to be installed
BEFORE the collet adapter and to be used by turning CCW to push
against the collet adapter to remove it. Otherwise you will need to
use a knockout bar to pound the 5MT to 5C adapter out of the
spindle. I have made them in steel and aluminum for different
machines and I find no reason to not use aluminum. If you do use
plastic be sure that it is strong enough to withstand a bunch of
torque with a spanner in pushing out the adapter.
In order for it to work the adapter needs to have a "step" in it
which the pusher can push against. If the hole in the pusher is just
a clearance fit over the adapter then a snapring in a slot will
provide the surface to push against.
Cecil
At 07:29 AM 2/11/2018, you wrote:
Another reason to get one of those 3d printer things is that I don't have
a thread protector for the 2.25x8 spindle on my Sheldon. I've considered
making one out of alu, but putting that in contact with alu doesn't seem
like a Good Thing. I saw a you-tube video where someone made one out of
pla for a smaller 6" craftsman, and expanding that for the 2.25" seems
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