ak question

[slickjoesd]

so here i am in my garage with my drill press....i am going to attempt a screw build, it says you drill using a #21 bit, before tapping... now my question is you drill right into the old rivits or do you have to drill into the old rivets and pry them out somehow first? Anyone help me out here? any tips and tricks? I have allread ground the old demilled reciver off. Thanks
Joe

Ps someone told me there is videos on the net somewhere, but i cant seem to find them.... anyone have a link?

[wayoutwest]

Slick, you will have to drill right into the rivits on the upper ones, you will need to be careful on how deep you drill, cause you dont want to drill into the barrel. There is a silm chance that the rivits can be removed from the uppers holes with the barrel in place, there is very little room in between the barrel and the inside of the trunion. The lowers rivits you can drill out and tap the trunion without a problem.

Tap VERY slow and use lots of cutting oil, back off the tap every quarter turn at least. Ask me how I know.

[slickjoesd]

yeah thats what the paper i have says about being slow..... I center punched my 1st one and started drilling, but the damn bit went off center. any sugestions?

[wayoutwest]

center punch deeper, pre-drill all the holes with a much smaller bit they go up in size to the one you need.

[slickjoesd]

thanks for your help! I am going to hold off till i get some better bits.

[triaged]

What you want to start the holes is a center drill. Spin them somewhat fast and feed them slow. Because they are so short they won't deflect like a normal twist drill does.



To start the tap chuck it up in your drill press and turn the pulley by hand (DO NOT POWER IT IN). Once you get it started straight you can go to the tap handle.

[superhondaz50]

Tap VERY slow and use lots of cutting oil, back off the tap every quarter turn at least. Ask me how I know.

Hey way out west, did you use a bottoming tap for your build, or did you modify a standard tap by grinding down the tip to make a bottoming tap, or did you do something different? So what happens when you tap to fast, i'd like to hear the story

[wayoutwest]

Hey way out west, did you use a bottoming tap for your build, or did you modify a standard tap by grinding down the tip to make a bottoming tap, or did you do something different? So what happens when you tap to fast, i'd like to hear the story

I happen to have a press so I didnt need a bottoming tap but I bought one anyways, I had tapped the front trunion without any troubles, started on the rear, was working on the last hole, not paying attention, not backing off and the tap broke off inside the rear block. SO I am still trying to get it out. The materal the tap is made of is very hard.

[superhondaz50]

Were did you get your bottomin tap? I am trying to find one locally.

[CowtownBallin]

would it work if I just grind the heads off the rivets and punch them through?

[Builder]

I drilled out all of the rivets in the parts kit with an undersize drill and then progressed to slightly larger ones until they came out. I first flattened the tops of the rivets a little with a grinder. This resulted in no damage to any of the reusable parts.
Thanks,
Builder

[Pablo]

Ps someone told me there is videos on the net somewhere, but i cant seem to find them.... anyone have a link?

Not a video but it has a lot of pics! I hope it helps:

http://www.gunsgutsandgod.com/SBS%20tutorial.htm

The original thread:

http://www.calguns.net/calgunforum/showthread.php?t=30457

[glen avon]

would it work if I just grind the heads off the rivets and punch them through?

sometimes. sometimes they don't just go thru, esp. the rear trunnion rivets.

[superhondaz50]

I just finished my build. Some holes on the NDS werent lined up, but it worked out ok. Hey wayoutwest, the hole your tap broke in was the same one I almost broke my tap in. I think that hole tapers as you go down which causes problems. As for the trunion holes, I dont know what everyone is talking about, mine taped like a knife going though butter. How many rounds do you have through your gun?

[TheMan]

sometimes. sometimes they don't just go thru, esp. the rear trunnion rivets.

This was what I found as well. I was able to punch the short rivets through after cutting their heads off. But the long ones on the front and rear trunion, I had to drill all the way through, before I could then punch them out.

The centering drill saved my *** on a couple of those rivets, one of these is a must have.