by bdring » Wed Jan 02, 2013 9:33 pm
I don't have any, but...
You can make them out of HDPE. They were originally tapped. Delrin taps better than HDPE. HPDE threads are very tight and would use up all the torque of the motor. The first batch from China were fine, the second batch were drilled at a slight angle. I reworked all of that batch to add metal inserts, drilled and arbor pressed in straight. All follow on batches used the insert. If I had started with the insert, I probably would have used HDPE.
Here is the M8 insert.
http://catalog.pemnet.com/viewitems/hex ... nal-metric
Bart
"If you didn't build it, you will never own it."