Reamer sizes

[Twmaster]

Quick question about reaming. If you want to make say, .451" pills would you ream the bore of your die to .4510" or say a few tenths larger like .4515"?

[Cane_man]

what are you reaming, and what type of reamer are you using?

[Twmaster]

41xx series steel and a chucking reamer.

[blaser.306]

Idealy ream undersize and polish lapp to final dimention. Is your 41xx?? Pre-hard or in a fully annealed state?

[Twmaster]

Blaser..

That is the answer I seek.

[Cane_man]

not sure what you are making, but if you are making some type of swaging die you will want to ream annealed 4140 type steel to about 0.004 under final ID, rough lap to about 0.002 under then heat treat, then lap/polish to final id