PDA

View Full Version : Couple of questions regarding a TM jig


m16
02-20-2014, 6:48 PM
I finally got my jig from Tactical Machining and I have some questions.

Here it is assembled:

http://i.imgur.com/LmHU688.jpg

The kit did not come with any instructions, I'm actually milling this on a Bridgeport with a DRO and using the jig as a guide.

It looks like I use plate #TM1001 and make my first cut 0.625" below the top edge of the receiver.

Then I use plate number #TM1002 and continue cutting to a depth of 1.250".

(I verified these measurements by checking a finished receiver.)

Obviously the last plate is used to punch through the bottom for the trigger.

So, how much can I cut on each pass using a two-flute carbide end mill?

Should I drill the trigger pin and selector holes before or after milling the pocket?

kcstott
02-20-2014, 7:12 PM
I would not use carbide but it will do the job. and you r second dimension depth is incorrect. should be 1.249" +/-.010"

as for depth of cut, that depends on your feed rateI can feed my machine with a prototrak style control at 10 IPM at about 1200 RPM .100 depth of cut leaving .010" all the way around and deep to clean up.

If you are hand cranking a machine thats 1.5 revs of the handles per second. pretty damn quick

m16
02-20-2014, 7:15 PM
Yeah that was a brain fart, I meant 1.250"

What kind of end mills do you recommend, I don't mind buying the proper cutters since I have more than one lower to do.

kcstott
02-20-2014, 7:20 PM
Plain old HSS works just fine in aluminum. Three flute is the best for surface finish and least vibration. Carbide is over kill and Aluminum tends to stick to it better and clog up the flutes

I notice they recommend a 3/8" end mill. I use a 7/16" I can push it harder but 3/8" will do.

m16
02-20-2014, 7:22 PM
Roger that, thanks for the info.

kcstott
02-20-2014, 7:32 PM
use soem good aluminum cutting oil too. WD40, kerosine something

lovemyguns
02-20-2014, 7:38 PM
here is a good video to watch...http://www.youtube.com/watch?v=ZKz2sLJUvGU

m16
02-20-2014, 10:23 PM
Yikes.

I'm glad I don't have to do this on a drill press.

wecf
02-21-2014, 9:05 AM
here is a good video to watch...http://www.youtube.com/watch?v=ZKz2sLJUvGU

PLEASE, please DO NOT use this method. PM me if you are thinking of doing it this way.

lovemyguns
02-21-2014, 8:42 PM
Yikes.

I'm glad I don't have to do this on a drill press.

I do them all the time on a drill press until I get my bridgeport up and running and some do them with a router. The more you do them on a drill press the easier it gets....

kcstott
02-22-2014, 7:48 AM
PLEASE, please DO NOT use this method. PM me if you are thinking of doing it this way.

The only reason the guy can get away with that is he has a 100# MILL vise on the drill press. it that was a drill press vise the end mill would grab and yank it out of his hands

lovemyguns
02-22-2014, 8:27 AM
The only reason the guy can get away with that is he has a 100# MILL vise on the drill press. it that was a drill press vise the end mill would grab and yank it out of his hands

Here is my setup for now and works just fine and I use a $19 vise from homedepot. You need to go slow and easy and everything comes out just fine. You can't rush perfection and I whip these out in 43.5 minutes now because I take my time.
http://i307.photobucket.com/albums/nn287/bebe67_01/Mobile%20Uploads/image_zpsd2e2993a.jpg (http://s307.photobucket.com/user/bebe67_01/media/Mobile%20Uploads/image_zpsd2e2993a.jpg.html)

Iminocca
02-25-2014, 7:38 PM
Here is my setup for now and works just fine and I use a $19 vise from homedepot. You need to go slow and easy and everything comes out just fine. You can't rush perfection and I whip these out in 43.5 minutes now because I take my time.
http://i307.photobucket.com/albums/nn287/bebe67_01/Mobile%20Uploads/image_zpsd2e2993a.jpg (http://s307.photobucket.com/user/bebe67_01/media/Mobile%20Uploads/image_zpsd2e2993a.jpg.html)

43.5 minutes....any pictures of the finished pocket? Would love to see what you can do with that set up.

lovemyguns
02-27-2014, 7:12 AM
43.5 minutes....any pictures of the finished pocket? Would love to see what you can do with that set up.

The pocket might not be pretty but it functions just as good as any store bought lower plus no one sees the pocket so it does not matter if what it looks like.