Re: accurate bore - Correction



Karl Townsend wrote: 
I made a mistake on the spec, by double. Its 2.375 -0.000 +.001

I did this from last night's memory. I've got CRS (not cold rolled steel, Can't Remember S*&^)


"Karl Townsend" <karltownsend.NOT@xxxxxxxxxxxxx remove .NOT to reply> wrote in message news:ux72f.665$y14.617@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

"The Kid", my 22 year old, is taking on a job for our Mazak M4 lathe. The part is 24" long by 3" OD, 2"ID, with a ton of features. The job is for 60 units a week, six to eight months a year.

On each end is one tight tolerance bore, 2.375" -0.0000 +.0005. Looks like they will put a Timken bearing race in that spot. The rest of the job demands that this bore be made with two feet of part hanging out of the chuck. What's the best way to do this? I'm guessing we should look for an adjustable boring head with two opposing carbide inserts. Or maybe a reamer that can be chucked in the back turret.

Karl







You will have to bore that in a steady rest to maintain concentricity. The end turns must be turned on centers to run the steady rest on them and maintain concentricity. +.0005 on a bearing bore isn't very hard to hold if you have a good steady rest.





John





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