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Finishing 80% lowers - I have questions

Posted on 11/8/13 at 10:53 pm
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
89516 posts
Posted on 11/8/13 at 10:53 pm
Anybody done it?

Can good results be achieved with just a drill press, standard jigs and a few specialty bits?

How much easier and faster is it to use a lathe? Is it enough to justify the cost?

Any recommended jig sets? And recommended 80% lower sources?

I'm a pretty handy guy, but I haven't worked with a whole lot of metal - how much experience is the absolute minimum and is there anything I can do to practice?


Posted by Carson123987
Middle Court at the Rec
Member since Jul 2011
66413 posts
Posted on 11/9/13 at 12:35 am to
buddy of mine has finished a few at his shop and he said it's extremely easy provided you have the tools
Posted by ninthward
Boston, MA
Member since May 2007
20412 posts
Posted on 11/9/13 at 3:50 am to
yes you can do a very good job with a drill press, an x and y vise and some end mills. Tactical Machine and Juggernaught tactical is where to look I think they both have tutorials online
Posted by Propagandalf
Baton Rouge
Member since May 2010
2528 posts
Posted on 11/9/13 at 12:56 pm to
quote:

How much easier and faster is it to use a lathe? Is it enough to justify the cost?


I would imagine it would be at least 100x more complicated and 10x slower if you attempted to use a lathe.

If your looking to buy a machine to do lowers, you want a MILL. And unless you intend on doing a lot of them, spending $1,500 - 3,000 on a mill is not cost effective.
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
89516 posts
Posted on 11/9/13 at 10:58 pm to
quote:

If your looking to buy a machine to do lowers, you want a MILL.


What about a Mini Mill?
Posted by ninthward
Boston, MA
Member since May 2007
20412 posts
Posted on 11/10/13 at 11:24 am to
Mini mills are great but the best ones are 1100.00(for 80% lowers, if you plan to mill other steel products you need a bigger mill if this is your thing go buy a used bridgeport on craigslist)
the 500.00 harbor freight one is a glorified drill press. I have seen just as good of jobs off drill presses than I have on mini mills, its all in the worker, etc. I have zero issues with either.
Use whatever tool you can to produce a functioning lower within the law, blah blah drill press or mini mill.
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
89516 posts
Posted on 11/10/13 at 12:22 pm to
quote:

I have seen just as good of jobs off drill presses than I have on mini mills, its all in the worker, etc.


I see the tutorials all over the internet - it looks as if a drill press and an X/Y axis vice (which the HF appears to just combine into one package) can do the job - I'm just seeing that this is about a 12-hour project with a press, while it can be done in 2 hours with a mini mill. I don't know if I'm patient enough to take 12-hours, unless I really break it up into batches.

As far as the mill configuration - I see lots of recommendations for X3 to do this, suggesting that X2 machines are struggling for this project, but that really starts to amp up the cost.

Also, what about DRO options? Is that worth the convenience/precision (and lets assume that once I get into machining, I might do other things with it, but probably not.)

This post was edited on 11/10/13 at 12:57 pm
Posted by colorchangintiger
Dan Carlin
Member since Nov 2005
30979 posts
Posted on 11/10/13 at 12:24 pm to
I'll have a few 80% I can sell you in a few weeks for $50/each.
Posted by Spankum
Miss-sippi
Member since Jan 2007
56018 posts
Posted on 11/10/13 at 1:51 pm to
a friend of mine has a machine shop on maryhill road...go over and spend a couple of days fricking around and then decide whether you want to start purchasing equipment and tools...
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
89516 posts
Posted on 11/10/13 at 3:06 pm to
Is that Southern Machine Shop?

Do you feel comfortable naming the proprietor?

(I've lived here since 1967.)
Posted by ninthward
Boston, MA
Member since May 2007
20412 posts
Posted on 11/10/13 at 8:10 pm to
I would love an X3 but space and cost keep me out of that. Drill press and good end mills and practice on things other than 80 paper weights.

Also, what about DRO options? Is that worth the convenience/precision (and lets assume that once I get into machining, I might do other things with it, but probably not.) ---yes absolutely worth it imo, not a necessity, but with blueprints and a dro you can get exact spec
This post was edited on 11/10/13 at 8:17 pm
Posted by Spankum
Miss-sippi
Member since Jan 2007
56018 posts
Posted on 11/10/13 at 8:28 pm to
quote:

Is that Southern Machine Shop?


no...it is not a commercial machine shop now, but a manufacturing facility...owner started a chain of drug stores in that area....
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
89516 posts
Posted on 11/11/13 at 8:31 am to
quote:

owner started a chain of drug stores in that area....



Pearson?
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