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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: ramses » Sat Jan 07, 2012 12:02 am

I don't know the details, but the square slot is a mag well, , and a .58" barrel is going in the thru hole. I assume JDP is using a blow forward bolt with something.

As you can see, I screwed up milling the slot. the mill y axis feeds the opposite way as the lathe, so I blew through the wall of the mag well. Yay JB weld!!!

It took me much longer than it should have. with a CNC and manual tool changes, it would have taken maybe 15 minutes. And then another 30 to tap that hole.

And it wouldn't feed the wrong way :oops:
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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
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Unread postAuthor: JDP12 » Sat Jan 07, 2012 1:18 am

Can't wait to get it... ramses I'll paypal it tonight to ya.
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Unread postAuthor: jeepkahn » Sun Jan 15, 2012 8:08 am

Here's some of my handi-work on muzzle brakes for firearms...


[youtube]http://www.youtube.com/watch?v=2JlObEv8WNo[/youtube]
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Unread postAuthor: CooperJS » Sun Jan 15, 2012 8:56 am

nice, looking very sexy :D
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Unread postAuthor: jeepkahn » Fri Feb 03, 2012 7:38 pm

Ok, Sortof of topic, but not really...

Today I was running some 1"thick aluminum plates with various features and the like, with an o.d. on one of the features 18.500"-18.499", ok .0005"+/-, no biggie... Ran them, measured them 18.4993"(they still get anodized and spec'd dimensions are after plating).

Now the fun part, when I measured them, the shop was around 72degrees f, and about 20minutes ago my boss(the owner) call me and tells me he just checked the parts and they're dead(out of tolerance 18.4967"), I ask him, is the heat still on in the shop, and his response is "No, I turned it off at lunchtime.", so i respond, "has it cooled off much in there yet?", he responds, "it's a little chilly, but not bad." I say, "well they probably shrank" and his response is, "there's no f*#king way!!! I could put these things in the freeezer and they won't shrink but a tenth or two(.0001-.0002)"... by my calculations, it would only take about 10-13degree drop, to shrink the parts to the size he measured...

So, YES, I work for a machinist he thinks the laws of physics don't apply to him or his shop...

Rant Over!!!
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Unread postAuthor: ramses » Fri Feb 03, 2012 10:17 pm

That's why the shop where I work is controlled to 72 degrees. Parts will change to out of spec (or in spec) just by holding them in your hand.

Now imagine designing a system of those parts to work in a world where operating temperature changes, but the fit needs to remain the same.
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Unread postAuthor: DYI » Fri Feb 24, 2012 10:37 pm

Starting in May, I'll be offering machining services. I don't have a mill, but my shop is otherwise well equipped. My lathe is a 10x22 with a 1" spindle bore, so please keep in mind that anything over 1" diameter becomes somewhat more time consuming, and that I can only do short pieces over 2" in diameter.

My rate as of now is $20/hour for machining and consulting services, plus materials cost and shipping. Given my current supply line, you'll have to allow ~2 weeks for raw materials to arrive at my location, but I already have quite a bit in stock. I can also produce standard engineering drawings from your designs, at the same rate as above, if any outsourcing is required.
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 17, 2012 1:55 pm

A little something I made for a colleague, a keychain very loosely based on the bullets from the movie "Wanted". The nose is theaded to reveal a storage compartment but heaven knows what he wants to keep in there :D
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Unread postAuthor: Gun Freak » Sat Mar 17, 2012 1:56 pm

How did you cut the nose cone?
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 17, 2012 2:09 pm

Roughly with the compound slide then smoothed out manually with sandpaper.
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Unread postAuthor: Labtecpower » Sat Mar 17, 2012 3:13 pm

That looks very sexy! :D
I wouldn't mind having that on my keychain..
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Unread postAuthor: MrCrowley » Sat Mar 17, 2012 3:30 pm

Ooh, very sexy indeed. How long did something like that take you?
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 17, 2012 3:43 pm

Cheers guys :)

MrCrowley wrote:How long did something like that take you?


Started this morning, 12 hours from start to finish but doing other things in between.
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Unread postAuthor: Petitlu » Sat Mar 17, 2012 5:28 pm

great job!

very nice!
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Unread postAuthor: sharpshooter11000 » Sat Mar 17, 2012 6:07 pm

jackssmirkingrevenge wrote:Started this morning, 12 hours from start to finish but doing other things in between.


Exactly the reason my mum thinks my homework takes so long :roll:

Looks great! How did you do the side engraving? Acid?
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