Gallery, Projects and General > Oooops!
It's the little things that catch you !
vtsteam:
One other thought. If you have variable shims for an insert you are slightly altering the thread profile. Obviously that must be an acceptably small amount, since they supply them. But it must occur to some degree in that type. The tools that don't use shims can have an ideal profile, but probably overdo the clearance for most threading in their range.
Or do I have that backwards? Is the ideal thread profile normal to the axis of the part, or normal to the helix angle? I assumed it was normal to the axis.
awemawson:
I >think< I've sussed it.
If you look at the chart in the Sandvik link I posted above, the vast majority of threads fall in the 'needing 1 degree' category so the 1 degree supplied shim is right in virtually all 'normal' threads, so this is why most dealers only supply that shim. Sets of other inclination shims are available at significant cost but rarely needed.
Andrew
lordedmond:
I knew you would sort it
just wind ( clockwork motor ) you up and let you run round a bit and bingo up comes the solution :lol:
I knew what they were for but not the full story
Stuart
awemawson:
Well it all turned out ok in the end :ddb:
This morning I finished off the nut
awemawson:
I decided to continue an experiment started seven years ago and never finished due to my move. I had heard that hot photographic 'fixer' works as a good durable blacking agent, I bought some, tried it on some bits of scrap and then packed it up and moved house!
So digging the rather fly blown bottle out I set up this blacking rig
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