December 23, 200520 yr Drilling a hole straight thru a sprocket hub, or something similar can be a real problem sometimes. It has to be almost exactly in the middle so the bolt or pin or whatever will go thru even if its turned half over. Some things are even hard to set up in a vertical milling machine and get centered, its just time consuming and nerve whracking. These stub shafts were shorts laying around the shop and were set up in the mill and drilled exactly in the center, then rotated a little and the next size hole was drilled and so on. They are kept by the drill press on a nail on the hairpin for easy access. Its much easier to drill those kind of holes with a drill press and much quicker, and with these simple jigs there is no lengthy set up and is almost fool proof. To use, first drill the initial hole in the part and then insert the right size shaft in part with the right size hole lined up with the initial hole and then position the drill bit down thru the part and the hole in the shaft, clamp in vise and drill the other one.
December 23, 200520 yr Dang fine idea, Jr. I am going to build a few this weekend between Christmas activities.
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