Methods in Measuring Angles or Checking Angles for tools?

E

Edgarf

I have a tool that needs angle to be calibrated,i have attached a simple drawing.
Can anyone give their ideas on checking angles for tools?

I've tried calculating the measurements in reverse,although i was able to get the angle,I want to know how the experts do it.

Thanks for replies.
 

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bobdoering

bobdoering

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CMM, optical Comparator, Sine Bar or angle blocks...just depends on the budget and availability. Biggest problem? Getting your 10:1 resolution at 0.01 degree. Need to measure at .001 degree. That is incredibly tight. I guess it is about 4 seconds (angular) resolution.
 
I

iamtroll

If you really mean calibration and not just measurement, you would probably use an autocollimator and also the angle surface for flatness with an optical flat.
 
bobdoering

bobdoering

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The digital protractors from Insize only have a 0.1 degree resolution. Even those are not "good enough".
 
bobdoering

bobdoering

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It is best to you can measure directly, if possible. You eliminate possible calculation error. Every calcualtion and additional measurement step is a potential, additive probability of cause for error.
 
N

normzone

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Out of curiosity, does the application require this degree of precision to develop the end result as desired, or is the nominal and tolerance a result of having an available stockpile of decimal places?
 
BradM

BradM

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Admin
bobdoering said:
It is best to you can measure directly, if possible. You eliminate possible calculation error. Every calculation and additional measurement step is a potential, additive probability of cause for error.
Click to expand...

That's true. Good points.

However... sometimes we take what we can get. :D

I had a task of verifying a tool once with lengths and angles. I didn't have the correct equipment to accurately measure the angles. I could measure the lengths fairly accurately. It wasn't the best process, but it sufficed. :)
 
D

David-D

Involved In Discussions
I tHink the first question that really needs to be asked is how big is the part? Is it 1 inch? 1 foot? 1 mil? Depending on the size/scale its going to be a significantly different problem. Also, what is the shape of the tool? Rectangular (w/ a flat reference surface)? Round/cylindrical? I'd think it makes a big difference trying to make the measurement. Also, for all the accuracy being called for, I'm a bit surprised it isn't specified with GD&T.

David
 
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