Gallery, Projects and General > How do I??
How do I.... accurately measure a tilted hole?
efrench:
Won't ball bearings give you an accurate location?
Lew_Merrick_PE:
--- Quote from: AdeV on November 23, 2015, 11:46:05 AM ---Lew, unfortunately, not so much in this case, but thanks for the thought! I'm not quite sure how I'd use a tooling ball in this instance...
--- End quote ---
There is a relatively simple solution to your problem if the countersinks are consistent and accurate. Place (3 equal sized) ball bearings into the countersinks and lay a piece of (flat & true) plate on top. You can then adjust (tilting head or table) until an indicator sweep is reasonably close to true -- and your head's axis will be perpendicular to the hole set. The rest is just trig!
Joules:
For my own jobs I make a plug with a central dowel on the lathe. If need be the plug can have a shoulder, then a DTI is used to reference off the dowel. 3 Balls great as long as the screw holes aren't damaged or chewed up. If I understand what you are wanting to achieve, correctly.
awemawson:
Lew,
The fly in the ointment of your method is that it entirely relies on those counter sinks being exactly the same. I'd have though sweeping the face that they are drilled in is more likely to give an accurate result :scratch:
BillTodd:
know any one with a cmm?
measuring the angle requires ony a surface plate and a sine bar.
locating the hole is tricky, but if you have a mill big enough to make one, then could you not make measurements with the mill and a touch sensor? (poor man's cmm)
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