@8ob delapena is what I’m familiar, along with abrahone engineering which is another quality manufacturer.
@jmp49 some good advice. I cut my teeth honing steam turbine coupling bolt holes on various plants from the 60’s / 70’s to within a tenth of a thou. It was done free hand with a “gut buster” two speed electric drill which would rip a shoulder out if you didn’t treat it with respect…
Always standard practice when re-aligning a machine after rebuilding. Doesn’t happen much now though.
@jmp49 some good advice. I cut my teeth honing steam turbine coupling bolt holes on various plants from the 60’s / 70’s to within a tenth of a thou. It was done free hand with a “gut buster” two speed electric drill which would rip a shoulder out if you didn’t treat it with respect…
Always standard practice when re-aligning a machine after rebuilding. Doesn’t happen much now though.