rbahr
Aluminum
- Joined
- Jul 13, 2004
- Location
- Carlisle, MA, USA
I have some holes that I would like to machine, and they are currently threaded. How do I indicate them to precisely find center on my mill?
Thanks
Ray
Thanks
Ray
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It depends upon whether you want to locate the centerline of the pitch diameter or the centerline of the minor diameter. The pitch diameter is more accurate but it requires a plug gage like these. Threaded Hole Centerline Location Gages. If you just want to locate the minor diameter (depending upon how accurate you need to be, this might be good enough) you just need to find the largest plug gage that will slip into the threaded hole, and then indicate that.
Best answer. Shoulder bolts / stripper bolts are made on purpose to be square and true to the thread, and they are pretty cheap and readily available.Alternatively, a shoulder screw could get you close if you indicate the ground diameter.
Metric, eek, sorry. You just said that part I've only used inch. Hope they are available in metric, too.Ok, I will look for some shoulder bolts.
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