SpudFiles

Hey all, I'm lookin for someone to machine me something out of a block of aluminum. Specs are attached, diagrams may be a little unclear please let me know if there is any confusion.


i don't have the aluminum, if need be i can order it and ship it to whoever it is, but if you can procure the aluminum yourself that'd be easier, I can still pay ya for the block.

JSR if ya want a crack, i'd love to have a piece of my gun that was made by you, shoot me a PM and we'll talk shipping costs, as I really wanna get some of your work in person.

I would love to help but even if I pay myself minimum wage, it would take so long to do on the little Sherline that it would cost you a small fortune. This is more appropriate for someone with more heavy duty equipment

well shit, that's disappointing.

For other interested people- this isn't a sure deal, i can easily do this without a machined block, i can do it with a couple tees, but i'd like to get an idea of prices first, if the price of a machined block is reasonable, i'd do that.

That seems do-able, but I don't have any 2" wide aluminum stock on hand. I have some ~2.25" round, but I'd have to take off SOOO much material. The closest I have is 1"x 1.25".

Depending on time scale, Ill see if I can hit up my employer for a drop.

The only other foreseeable problem is the blind threads, especially the .5" depth 1/2" NPT. My only 1/2" NPT tap is very tapered.


If I have the right size block, I can't see this taking me more than 2 hours if we resolve the blind threads so call it $15 + materials?

I think you could do this with a drill press and some hand taps, actually. Sure, you won't get +/- 0.005" precision, but you would easily get a product which could be used for what you're using it for. Hell, you could make it out of plastic if you're making something like PS's mark III.

Sure, you won't get +/- 0.005" precision

mine wasn't precise at all

IIRC the ID was 9.1mm specificaly to improve reliability - so that ammo couldn't be blocked by a small spec of sand or something like that

Besides I guess it made machining it easier as precision wasn't that important (0.2mm +/- wouldn't be a big deal as the ammo I used was 8.731mm)

There is no need for high precision in something that essentially is a double T drilled in an alu block.

Another thing: there will have to be some radius on the mag well. And the iso view seems to conflict with the other views.


I will add that I am going to go pick up the block in about an hour. If you don't want it, Ill use it for something else.

ok looks like theres been some confusion.. the block is only 1" wide if there was confusion wiwth that.

Why did you think the mag well has to have a radius? the iso view shows it as having a radius on the top where it meets the barrel hole, but really its just a straight through slot to the barrel, no curves on that.

what are some of the other issues you see?

To actually make the part, there needs to be a radius. Picture cutting it out with a drill bit. To make it sharp, one would file or broachit.

The other issue is the iso view. It shows a sort of reverse pyramid that bottoms out. The other views show a "normal" slot that mates with the hole for what I assume is the bolt.


Sent from my phone.

ok i get what you mean by the radius... can you not do a sharp slot? not a huge problem if you cant..


as far as your reverse pyramid in iso.. i'm not seeing it? Are you saying the mag well looks tapered? it's a straight slot, through to the .625" hole. I'll try to clear it up

i can get it down to a .0625 radius, depending on depth, then file.

I figured you wanted a straight slot. I was seeing the pyramid in the iso view on the same pdf as the side views.

I can start work this week. I have some other stuff I have to finish first, though.

.0625 radius on each of the four corners would be acceptable, if ya could file it down that'd be better since i gotta get the magazine to fit as well.

Any other questions you got on the design? the .5" hole with 1/2" NPT should go through to the .625" hole, as thats the air inlet to the barrel not sure if that was clear.

what are we talking price wise?

everything else seems straight forward. is it an issue if the 1/2" npt port goes through to the barrel/bolt (at the larger diameter? Not critical, but would make things easier. I will file the mag well to make it squarer.

How about ~$20, plus shipping?

nope thats fine, i figured it might be easier if ya do it that way. that don't matter.

$20 plus shipping sounds fine to me. Do you need an aluminum block sent to you or can you get one?

Also, just so you know the 3/8-24 threads on the back are to mount an air cylinder- here's mcmaster's cad drawing of it for ya

http://www.mcmaster.com/#cadinlnord/6498k113/=fg7buw

whats the width of the piece you're using?

JDP12 wrote:nope thats fine, i figured it might be easier if ya do it that way. that don't matter.

$20 plus shipping sounds fine to me. Do you need an aluminum block sent to you or can you get one?

Also, just so you know the 3/8-24 threads on the back are to mount an air cylinder- here's mcmaster's cad drawing of it for ya

http://www.mcmaster.com/#cadinlnord/6498k113/=fg7buw

thanks! PM me with your address. I'll respond with my paypal account. Ill send pictures before I expect payment. I have the block.