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Basic
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Posted: 1/5/2013 10:23:21 AM EST
I want to replace my 4 lowers with 80% ones. I understand I need a drill press/mill and bits to complete it. What is the cheapest machine to do this? I see the $500 Harbor Freight mill in another recent thread but I would rather find something cheaper if possible as I am only going to use it 4 times and sell it. Suggestions?

Buried Susie Derkins under the tire swing.
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Link Posted: 1/5/2013 10:46:05 AM EST
Get a drill press of of Craigslist or garage sale and the correct drill bits for the lower. CNCguns.com for info. The forum there is good with a how to on that site as well. Justin also makes jigs. List the jig up for sale in the EE when you are done with it to get some of your money back.

Hardest part is finding the 80% lowers. Do you already have them? If not, you may be waiting a while to get any in. I'm not sure if you're looking to turn a profit on these, but by the time the 80% lowers are in stock, so will all of the built lowers at venders.
Trapped by a hideous graknil, Spiff draws his trusty atomic napalm neutralizer. "Chew electric death, snarling cur!"
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Link Posted: 1/5/2013 11:07:14 AM EST
Also you may find in your local area either someone that has the tools to do this or ive seen build parties as well...

If you were up here I'd say stop out...

Many people on this forum either have access to or outright own milling machines...

I got my old milling machine FREE many years ago...

YMMV
Bret

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Link Posted: 1/5/2013 12:40:35 PM EST
I don't have the 80% lowers yet but I am going to grab them when I see them. I have been watching craigslist for a used one with no luck. I figured if I could pick up a new HF mill cheap then I could sell it easier. I just don't know which cheap one would do the job.

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Link Posted: 1/5/2013 4:24:39 PM EST
If you are careful, you could use a drill press with an X-Y table.

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Link Posted: 1/5/2013 5:04:09 PM EST
"Cheapest way"

Homemade plywood drilling jig, using a stripped lower to make.
Standard drill bits to remove as much material as possible.
Dremel to clean it up
I'll never count how many I have. That way I don't have to lie when she asks.
And, yes, I do need another one.
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Link Posted: 1/5/2013 5:28:30 PM EST
If you use end mills where needed and a x,y table with your drill press it will work perfect when drilling fire control. You will have no clean up.
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Link Posted: 1/6/2013 11:58:35 AM EST
[Last Edit: 1/6/2013 12:35:14 PM EST by Russ4777]
Originally Posted By MHIDPA:
If you are careful, you could use a drill press with an X-Y table.


+1

I have finished several on my D.P. with a 2-axis slide vise. Go very slow and take very small cuts. A D.P. is not as rigid as a mill and the cutter may chatter if you take too deep cuts.

Another option is find a "build party" in your area and pay the $60 to use someone's milling center. Done in 8.5 minutes and perfect CNC cuts, drilled, and reamed holes. I just finished this one at darksoultactical.com.





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Link Posted: 1/6/2013 12:32:38 PM EST
That looks Really nice the way you have your trigger guard. Did you buy an 80% and if so, where did you get it? Did you machine it from bar stock?

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Link Posted: 1/6/2013 12:37:17 PM EST
[Last Edit: 1/6/2013 12:38:42 PM EST by Russ4777]
It is an 80% Quentin-Laser lower purchased directly from them. I added the lightening holes in the trigger guard and the trigger take-up adjustment screw.
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Link Posted: 1/6/2013 12:43:16 PM EST
Originally Posted By Russ4777:
It is an 80% Quentin-Laser lower purchased directly from them. I added the lightening holes in the trigger guard and the trigger take-up adjustment screw.


What cross slide vise are you using?
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Link Posted: 1/6/2013 1:09:06 PM EST
[Last Edit: 1/6/2013 1:14:15 PM EST by Russ4777]
Originally Posted By CLICKBANGBANG:
Originally Posted By Russ4777:
It is an 80% Quentin-Laser lower purchased directly from them. I added the lightening holes in the trigger guard and the trigger take-up adjustment screw.


What cross slide vise are you using?


This one. Inexpensive yet pretty solid with adjustable ways.

http://www.newegg.com/Product/Product.aspx?Item=0E3-0001-00002
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Link Posted: 1/6/2013 1:18:39 PM EST

Originally Posted By rcassettyjr:
I don't have the 80% lowers yet but I am going to grab them when I see them. I have been watching craigslist for a used one with no luck. I figured if I could pick up a new HF mill cheap then I could sell it easier. I just don't know which cheap one would do the job.

good luck with that. they are permantly sold out and when they do show up they are over $300 last I saw.
callmenoshie: "saying that females have the potential to be "bat shit crazy" is like saying the sky has the potential to be blue."
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Link Posted: 1/6/2013 1:30:50 PM EST
[Last Edit: 1/6/2013 1:32:46 PM EST by CLICKBANGBANG]
Cool. Thanks. In looking at this Westward for small projects.
Trapped by a hideous graknil, Spiff draws his trusty atomic napalm neutralizer. "Chew electric death, snarling cur!"
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