80% Arms- Easy Jig

[00tec]

Huh?

I bought an extra end mill for mine. It is 1/4" diameter, 4" long end mill. 1 1/2" length of cut. You order and ship to my address, I hand you my bit. (new in package)
It is the same price (ish).
Basically, buy me the replacement, and I hand you one. I'm not in the immediate need for one. Have one on the way for me and I'm good.

Basically, place the order, show me confirmation, and as long as it is legit, I can wait for the bit to come in. I paid ~$24 for the bit plus shipping. I have another, so I don't really NEED it right now.

ETA: or, PayPal me like $30 and I will order it myself. (fees suck)

[balyon885]

I need the 3/8th sized one the most. My lower had most of the rear pocket opened and thats all the universal jig uses the 1/4 one for.

[balyon885]

Got it milled out, walls look pretty good few hills and such but the bottom is still pretty rough. Going to try and clean it up some more. Got a lpk to check and see if it will work tolerance wise. Don't care so much if it looks bad as long as it works. After all, it is my first attempt.

[David_J]

I've seen lots of photos of 80% lowers where the bottom looks a little rough from going a little to far with the drill. It is not something specific to any brand jig, but from not measuring properly. I'd recommend going a little shallow with the drill and that way when you finish milling it out there will be no dimples on the bottom. It's purely cosmetic and nobody will notice once you install the LPK. But for anyone anal and OCD types, just drill out the pocket a little shallow - maybe 1/16" or so. You may need to make a couple more passes with the end mill until you are the the spec depth but in the end you'll have a nice smooth bottom on your lower. I took my time and measured everything like 3 times to make sure I didn't cut too deep. It was messy but a fun project. Next time I'm going to have the shop-vac running the entire time I'm drilling or milling to try to catch all the stuff as it comes out.

[balyon885]

I got the bottom cleaned up but over milled the area by the hammer pin. Needless to say, I'm ordering another one.

[David_J]

Bummer. Go slow and measure twice everything. If you mess up one the lowers from 80% Arms they will replace it for half price.

[balyon885]

I'm using then Anderson ones, only 45 bucks. So not a horrible hit.

[james_bond_007]

Side force on the bearings of the chuck from the end mill are one of the problems you're having. I know people use drill presses for these projects, myself, i'd use a mill. Even one of those table tops units. Yes not everyone has access to a mill and a drill press does work. I'd be real leary of doing more than 1-2 using a drill press, tops.

I would consider the type of work and material to be 'light' machining (especially if you mill out in small increments).
I came across this "adapter" for a drill press that, on the surface, seems pretty easy to make.
It also looks like, for they type of work we are talking about, would take the lateral load off the drill press bearings.

http://books.google.com/books?id=AuA...epage&q&f=true

I have concerns that too much lateral force might move the jig, though.
Your thoughts ?

(Here's a brief overview)

[Great-Kazoo]

I got the bottom cleaned up but over milled the area by the hammer pin. Needless to say, I'm ordering another one.

Depending how far off, you might consider shimming the H/T/S , making sure it is centered.

http://www.brownells.com/gunsmith-to...k-prod589.aspx

[balyon885]

I thought about a drop in trigger too.