ream out gas check

[oldfart]

how hard is it to ream out gas check section?
can it be done with hand reamer?

[RayinNH]

My brother did a .45 Colt mould for me. He used an end mill. Use a depth stop so you don't cut into the mould too deeply...Ray

[Ben]

You might want to look at this :

http://castboolits.gunloads.com/showthread.php?t=22102

[beagle]

The easiest and safest way is to get a machinist with a CNC vertical mill to do it.

Comes out very precise that way. Of course, if it's done by hand and gets a little oversize, sizing takes care of it./beagle

[MT Gianni]

The reaming is easy. The set up and maintaining straight and true are not. Gianni

[BABore]

I do them on a vertical mill with a boring bar. Indicate the cavity in and your all set. Ink up the inside and adjust the boring bar until you just start to remove it.

[JIMinPHX]

The best way to do it is with a boring head on a mill (CNC or Conventional). It can also be done on a lathe with a boring bar, if the lather has a 4 jaw independent chuck or a faceplate with tie down clamps.

Reamers don’t really like to take off much more than about .005-.010” in a single pass & as was said before, the trick is to keep them on center. If you do use a reamer, it is best to first use a countersink, spot bit or chamfering tool, then a slightly undersized drill bit, then the reamer. In any event, when you run the reamer, use plenty of oil & run it at a very slow RPM if you run it in a drill press. If you turn it by hand, then make up some kind of support to hold it straight.

[JIMinPHX]

Also, look here -

http://castboolits.gunloads.com/showthread.php?t=22102