16mm test bushing set.

by xochal, published

16mm test bushing set. by xochal Feb 4, 2013

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this is a set of test bushing to figure out what size you should size your holes to make a 8mm brass self aligning bushing fit properly.
I designed it so someone else could tell me what size i should make the holes when i modify my x carriage for brass bushings. (i dont have any on hand)
the test bushings have the actual size printed on them.
UPDATE: 2/4/13 to clarify the marked size is the inside hole size.


I suspect that the porper size should be about 16.2mm you can print the whole set as a plate or one at a time till you find the proper one.

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My general rule of thumb is: exact size hole if you want a screw to cut its own thread. 0.2mm extra for tight press fit, might require a hammer. 0.4mm for tight thumb fit, push in with a thumb but will stay put. Double the tolerances for plastic on plastic.