10-05-2015, 08:24 AM
Just to be clear, we are talking about removing the rear sight base sleeve from the barrel - correct?
No offense - I just want to make sure you aren't trying to remove the sight ladder from the base. Sometimes folks just aren't aware of how they go together or come apart.
As far as milling out the cross pin goes, I would suggest using a solid carbide end mill (4 flute, center cutting) and offset your plunge cut slightly (away from the barrel) to avoid cutting a deeper groove in the barrel outside diameter. And crank up the RPMS. Small carbide tooling needs SPEED.
Do yourself a big favor and stay away from the cheap import end mill sets. They are ok for aluminum usually, but can't handle cutting even mild steel in some cases. I found that out the hard way myself as I have several sets of cutters that won't cut anything harder than a pine 2x4. Total waste of money (and time).
Stick to buying from someplace like McMaster Carr, and get decent quality end mills that will do the job in most cases for general use.
No offense - I just want to make sure you aren't trying to remove the sight ladder from the base. Sometimes folks just aren't aware of how they go together or come apart.
As far as milling out the cross pin goes, I would suggest using a solid carbide end mill (4 flute, center cutting) and offset your plunge cut slightly (away from the barrel) to avoid cutting a deeper groove in the barrel outside diameter. And crank up the RPMS. Small carbide tooling needs SPEED.
Do yourself a big favor and stay away from the cheap import end mill sets. They are ok for aluminum usually, but can't handle cutting even mild steel in some cases. I found that out the hard way myself as I have several sets of cutters that won't cut anything harder than a pine 2x4. Total waste of money (and time).
Stick to buying from someplace like McMaster Carr, and get decent quality end mills that will do the job in most cases for general use.
Willie