Bright Luxeon LED Bike Light

Step 12 Pretending to be a machinist

Here the builder is fantasizing that when he drills the next copper cap, the holes will actually be in the same positions as the first. Do the best you can here. To the amateur, small drill bits bend and wiggle all over the place when drilling on the outside of a cylinder. Allow yourself some loose tolerances and you'll have no problem.

Comments

[rodeobob]

If you use a centre punch to mark the holes and pilot drill with a (sharp) 1/8 or smaller drill bit you should be able to reproduce the holes accurately. Use an offcut of bar stock or pipe that the cap slips over mounted in a vice as an anvil.