Hi everyone,
As some may already know from my other thread, I'm in the middle of a process of screwing up my Hardinge HLV-H clone ( https://www.practicalmachinist.com/...why-did-i-take-apart-hardinge-spindle-359461/ ).
I just feel that it's more appropriate to discuss measurement-related part of that here, in "Metrology".
I want to accurately inspect/measure a spindle shaft, that I took out. I'm interested in runout, straightness, roundness and concentricity with .0001" accuracy.
Here is a measurement setup that I came up with: bearing surfaces of the spindle lie on AA grade gage blocks 0.500" each. 1-2-3 blocks are stopping the spindle from rolling. I wiggle an indicator back and forth to find the maximum and I assume it's a relative diameter of that particular spot. Then I will move the indicator along the spindle. And then I will rotate the spindle 45 degrees at a time and repeat.
Ideally, I'd like to get some sort of a map of diameter deviations along the spindle. I can double check the measurements looking at values that are 180 degrees apart. If I get it right - those values should match.
All the instruments were recently calibrated.
A separate question: how do I measure concentricity/roundness of outside/inside tapers on a spindle nose? I somehow need to do measurements at the exact same position on the shaft.
Thanks!
As some may already know from my other thread, I'm in the middle of a process of screwing up my Hardinge HLV-H clone ( https://www.practicalmachinist.com/...why-did-i-take-apart-hardinge-spindle-359461/ ).
I just feel that it's more appropriate to discuss measurement-related part of that here, in "Metrology".
I want to accurately inspect/measure a spindle shaft, that I took out. I'm interested in runout, straightness, roundness and concentricity with .0001" accuracy.
Here is a measurement setup that I came up with: bearing surfaces of the spindle lie on AA grade gage blocks 0.500" each. 1-2-3 blocks are stopping the spindle from rolling. I wiggle an indicator back and forth to find the maximum and I assume it's a relative diameter of that particular spot. Then I will move the indicator along the spindle. And then I will rotate the spindle 45 degrees at a time and repeat.
Ideally, I'd like to get some sort of a map of diameter deviations along the spindle. I can double check the measurements looking at values that are 180 degrees apart. If I get it right - those values should match.
All the instruments were recently calibrated.
A separate question: how do I measure concentricity/roundness of outside/inside tapers on a spindle nose? I somehow need to do measurements at the exact same position on the shaft.
Thanks!