- Joined
- Jul 31, 2020
- Messages
- 765
(Humor)
Based upon some of the responses here:
I had no clue there were so many hobby machinists who were making bearing race assemblies for high performance jet engines.
Have I needed 1/10th of 1000th inch accuracy on occasions when I worked in a fabrication shop on bearing assemblies? Yes.
Small factors like carbide wear caused significant drift, so the I.D./O.D. needed to be measured by a micrometer before the final
pass when that kind of accuracy was required. Even dimensional growth from the part being HOT from machining caused
variances as well which had to be considered. The part would be flooded with coolant to get it to an "operating temperature range"
before the final pass.
Have I ever needed 5/100th of 1000th inch accuracy on any home hobby part produced? No. Not once, Not ever. I might chase that kind
of accuracy if a Tramming Jig is made for a mill. Then I will get to sweat the fact the collet is only good to 1/10th of 1000th of one inch.
Based upon some of the responses here:
I had no clue there were so many hobby machinists who were making bearing race assemblies for high performance jet engines.
Have I needed 1/10th of 1000th inch accuracy on occasions when I worked in a fabrication shop on bearing assemblies? Yes.
Small factors like carbide wear caused significant drift, so the I.D./O.D. needed to be measured by a micrometer before the final
pass when that kind of accuracy was required. Even dimensional growth from the part being HOT from machining caused
variances as well which had to be considered. The part would be flooded with coolant to get it to an "operating temperature range"
before the final pass.
Have I ever needed 5/100th of 1000th inch accuracy on any home hobby part produced? No. Not once, Not ever. I might chase that kind
of accuracy if a Tramming Jig is made for a mill. Then I will get to sweat the fact the collet is only good to 1/10th of 1000th of one inch.