by bdring » Tue Nov 01, 2011 12:05 pm
The HDPE threads were very good against vibration. The threads were so tight, that it was quite hard to turn the screws. The depth of a the socket head on the nylon screw seemed less than a normal socket head screw so you had to be careful not to strip the head. I did put a little silicon lube on the threads which helped. My two concerns were the extra fabrication steps and the lack of good feedback on the pressure against the tube.
The initial photo did not show the complete design. Here is a snapshot of the drawing. There is a lock nut that is used to fight vibration. There is very little vibration that reaches the tube anyway. The soft plastic bracket itself attenuates a lot of it.
http://www.buildlog.net/cnc_laser/erp/g ... ber=B30044
Bart
"If you didn't build it, you will never own it."