The Shop > Tools
Internal hole measurement - bearing seat - opinions?
dickda1:
"Years ago our predecessors used firm joint calipers for most work and made bigger and better things than we do today."
When I read about how craftsmen used to chase threads on a lathe in a distant but still memorable age, I am humbled.
-Dick
Bogstandard:
John S,
The reason I always put in my posts 'this is the way I do it'.
Everyone has their own way of achieving things, and no two people will do it EXACTLY the same way, even though they think they do. If you end up with a good result, then the way you are doing it must be correct, for yourself.
What would the world be like if there was no diversification, everyone doing things the same way?
John
Anzaniste:
I feel much better having read this thread. I just thought that it was me who was a bit useless at measuring internal bores. I now wont feel so inadequate when it takes me so long to be confident about a bore measurement. :thumbup:
loply:
Hi folks,
I know this thread is slightly old but I thought I would chip in.
Just received a set of internal telescopic bore gauges, a cheap set made in China.
On receipt I noted that the finish on the ball ends was a bit crude, shiny but faceted, and that the motion of the telescopes was "stictiony" and scratchy.
I buffed the ball ends on a soft cotton mop on my bench polisher until mirror like and not faceted, and I dribbled some engine oil into the telescopic parts and blew air in to spread around.
I then spent 10-15 minutes practicing on a range of bearings I had handy from 10mm ID up to 40mm ID.
To my surprise I was able to get results to within ± 0.01mm with ease, if I measured the same bearing three times I would get the exact same result twice and maybe 0.01mm off on the third attempt.
My technique was to put the gauge in at an angle of about 15 degrees, expand it, lock the screw pretty tight and then slowly rotate it up to vertical and then a bit beyond whilst simultaneously wiggling it back and forth by 5 degrees or so in a direction perpendiclar to the main movement.
I then mic'ed the gauge using the ratchet on my mic.
Really pleased with the results, didn't expect such accuracy with such ease.
I suspect results will be less predictable on turned bores, but that's a function of the uneven surface finish, not of the tools or methods, I guess.
Joules:
My prefered method is a guage a few thou under size (.010) then use feeler guage strip to creep up on that final diameter. Ok for 20mm+ sized holes, and saves getting the gauge stuck.
Just my 0.01p worth
Joules
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