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Step 4Make the end blocks
Take the six pieces of cut MDF blocks (3 7/8" x 1" x 3/4") and drill all the holes in them using a drill press. I drilled them in marked pairs- that way I would be sure they would line up correctly.
Glue 1/2" x 3/4" long wood dowels into the holes on the three pieces. These wood dowels serve as anchors for mounting the stepper motor mounts later on, so if you don't want to make the mill CNC ready you can leave them out. If you make the blocks from Delrin then you don't need to use the dowel inserts since Delrin holds screws just fine.
Tap in the bronze bushings into the 3/8" hole in each block. Check the fit of the ACME rod in each bushing to make sure it rotates freely. The bronze bushing isn't necessary if you make the blocks from Delrin- instead drill a 1/4" hole for the ACME rod (the Delrin acts as the bushing.)
Glue 1/2" x 3/4" long wood dowels into the holes on the three pieces. These wood dowels serve as anchors for mounting the stepper motor mounts later on, so if you don't want to make the mill CNC ready you can leave them out. If you make the blocks from Delrin then you don't need to use the dowel inserts since Delrin holds screws just fine.
Tap in the bronze bushings into the 3/8" hole in each block. Check the fit of the ACME rod in each bushing to make sure it rotates freely. The bronze bushing isn't necessary if you make the blocks from Delrin- instead drill a 1/4" hole for the ACME rod (the Delrin acts as the bushing.)
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