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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: saefroch » Mon Mar 19, 2012 8:15 pm

I hope this isn't way out of place... But does anyone here have facilities for machining crystals? Right now I'm thinking about ZnSe, but possibly others.
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Unread postAuthor: Gun Freak » Mon Mar 19, 2012 8:19 pm

Just curious... why?
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Unread postAuthor: Fnord » Mon Mar 19, 2012 8:33 pm

^^ Someone needs to focus/reflect/transmit lots of intense Infrared light apparently :D :D

Oh and ramses, tube would be more effective. That's what I was thinking of as I typed, but as usual I kinda fialed at comunicaction;
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 20, 2012 12:35 am

Fnord wrote:Also I really like your shell jsr.


Image

:D

Someone needs to focus/reflect/transmit lots of intense Infrared light apparently


Are you making an Attenuated Total Reflectance unit ;)
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Unread postAuthor: JDP12 » Tue Mar 20, 2012 12:39 am

Hey all- I need a bolt machined for my rifle. Attached is the PDF file with the necessary dimensions.

I'm pretty sure I remembered to include all of the necessary dimensions, but please let me know if you have any problems with the drawing that you need clarified.

I need this made out of aluminum bar stock.
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Unread postAuthor: DYI » Tue Mar 20, 2012 9:28 am

I don't see anything on tolerances in that drawing. What are they?
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Unread postAuthor: saefroch » Tue Mar 20, 2012 9:34 am

Fnord wrote:^^ Someone needs to focus/reflect/transmit lots of intense Infrared light apparently :D :D
Right on. Estimated power is 100-400W, and I'm going to try to do this on the cheap.

jackssmirkingrevenge wrote:Are you making an Attenuated Total Reflectance unit :wink:
I'll let you answer that one yourself, based on the above numbers...
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Unread postAuthor: JDP12 » Tue Mar 20, 2012 11:18 am

Good point... I totally forgot about tolerances. I normally dont worry about it when I make things since I don't have the ability to machine that precisely.

I'll add some tolerances in an hour or two and update it.
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 11:34 am

Can anyone machine the pump head? I need the total outer diameter to be about 1/32" under 3/4", and the oring groove needs to be 1/8" deep, and 3/8" long. Total length needs to be 4", and I need the back part to be drilled and tapped to 7/16" for an all thread rod. I don't care what the material is, as long as it doesn't melt with the pump heating up. Any idea on what it would cost? I am located in Alabama, USA and shipping needs to be low.
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Unread postAuthor: JDP12 » Tue Mar 20, 2012 12:29 pm

Ok here are the updated drawings.

Added tolerances on the bolt. Also need a wooden block made to the dimensions specified. If i was at home I'd just do it on my table saw, but I'm not so I need that made. doesn't have to be super nice, as it'll just be a mold for forming a magazine.

Let me know if there are any other questions.

EDIT: Should probably add the files...

EDIT 2: DISREGARD THE PLANS I PREVIOUSLY POSTED! Realized I have to change a couple dimensions... standby for some updates tonight.

Thanks all
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Unread postAuthor: jrrdw » Tue Mar 20, 2012 5:06 pm

warhead052 wrote:Can anyone machine the pump head? I need the total outer diameter to be about 1/32" under 3/4", and the oring groove needs to be 1/8" deep, and 3/8" long. Total length needs to be 4", and I need the back part to be drilled and tapped to 7/16" for an all thread rod. I don't care what the material is, as long as it doesn't melt with the pump heating up. Any idea on what it would cost? I am located in Alabama, USA and shipping needs to be low.



1/32" under 3/4"


23/32"nds

the oring groove needs to be 1/8" deep, and 3/8" long.


Are you sure you want the groove that long?

back part to be drilled and tapped to 7/16"


The back would be on the right? The slotted skirt? How deep do you want the hole? Are the slots representing the hole or do you need the slots?
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 5:24 pm

Duh, should have been a bit more detailed. I am a bit rushed for this though... The back part is indeed the right side. I need it about 1 inch deep. If you want to, adjust the oring groove to what you feel would be good to make it like a check valve. The slots on the right side are representing the hole, and left side is the o ring groove.
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Unread postAuthor: jrrdw » Tue Mar 20, 2012 5:30 pm

With the way work is going I could get it out the door in approx 2 weeks for $30.00 shipped. It will be Aluminum. Your looking for a "floating o-ring".
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Unread postAuthor: sharpshooter11000 » Tue Mar 20, 2012 5:31 pm

Apparently you need to have the exact right size of o ring for it to act like a check valve. If its too small it will only start to act like a check valve part of the way through the stroke. I was reading that on another forum, somebody said that it happened to them with an o ring that was too small.

Would it not work if you had the piston (with an o ring to always be sealing) pushing the air through one check valve on the bottom (flow direction out of the pump) out to the cannon and when you pull the pump handle back up then it sucks air in from another check valve also at the bottom (flow direction into the pump)? It would be a whole lot easier to make.
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 5:39 pm

I kinda need it by next Wednesday Jrrdw. I dunno. I will see if I can use my friends lathe, but its his dad's and he may not let me.
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