I am working on getting setup to do some gunsmithing, and one of the things I want to be able to do is machine a pistol slide. Pistols are are full of undercuts, and there are some tough ones on the slide, namely the lugs that the barrel locks into. Here's a picture for those who may not be familiar:
FN HP-DA Compact Slide and Barrel
To me, the only way to access the round, square-shouldered cuts for these lugs is to come down through the front of the slide (to the right in that pic) with a long-shanked tool.
So my question is, how can I go about fabricating such a tool? My grinding facilities are limited to a humble bench grinder. I do however have a Wabeco D2400 lathe on the way (roughly 9x20, ~2HP spindle).
I'm guessing that perhaps I could make this tool out of an endmill with a toolpost grinder on the lathe. That said, I've spent a lot of money setting up the shop already and would rather avoid the additional cost of a toolpost grinder at this point. Would there be any other way to make this tool on the lathe?
Finally, my apologies for asking what is probably a basic question, but I am just setting up my shop and am teaching myself as I go. Unfortunately I didn't have any machinist mentors growing up, and my day job doesn't allow for any formal machinist education.
Thanks...