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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: jrrdw » Wed Jan 09, 2013 4:53 pm

I have to ask, why solid? That is going to be heavy for a piston. I understand your after strength, but it doesn't have to be solid. I can do it any way you want it. It's up to you but think it through before committing to it. There's all ready plenty of intel here for studying.

I would want you to send me all the materials for a faster turn around time. Plus your only paying for shipping and labor. That really simplifies things...
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Unread postAuthor: jsefcik » Wed Jan 09, 2013 4:55 pm

jrrdw wrote:I have to ask, why solid? That is going to be heavy for a piston. I understand your after strength, but it doesn't have to be solid. I can do it any way you want it. It's up to you but think it through before committing to it. There's all ready plenty of intel here for studying.

I would want you to send me all the materials for a faster turn around time. Plus your only paying for shipping and labor. That really simplifies things...



I can go hollow then I see your idea,, what exactly do I need to give you nd whats your price I wanna get like 2-3 of them

Ive seen some made with a 1 1/4 coupling nd two plugs nd washer nd rubber washer but I want mine done perfectly
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Unread postAuthor: jrrdw » Wed Jan 09, 2013 5:11 pm

How does $10.00 a piston sound? That's with you supplying everything. I'll throw in a cylinder truing so you will have positive seal all the way around.
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Unread postAuthor: jsefcik » Wed Jan 09, 2013 5:53 pm

jrrdw wrote:How does $10.00 a piston sound? That's with you supplying everything. I'll throw in a cylinder truing so you will have positive seal all the way around.


Sweet,, please give me a supply list I need to send you

Nd will you need the valve??? I have 2 seperate valves I need pistons for
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 24, 2013 6:04 pm

Spark plug for Zeus, 1/8 NPT thread with flats milled for a 1/2" spanner.
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Unread postAuthor: wyz2285 » Thu Jan 24, 2013 6:07 pm

Interesting... have tried to make one like that myself but had some problems (I had mentioned it some where). How much would a 1/4 one cost? Note that I need a very very tiny gap for high mix, like 0.2 mm
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 24, 2013 7:08 pm

wyz2285 wrote:How much would a 1/4 one cost?


Hmmm... 25 euro posted

Note that I need a very very tiny gap for high mix, like 0.2 mm


This one is 0.2mm, 5.6mm central part in a 6mm hole.
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 30, 2013 5:43 pm

Here's a barrel weight I made for a friend's rimfire CZ rifle:
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Unread postAuthor: Cosmic Muffin » Wed Jan 30, 2013 6:42 pm

So this is the spark plug Zeus was talking about. i must say i wasn't expecting it to look that fancy, nice work.
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Unread postAuthor: Gippeto » Wed Jan 30, 2013 8:24 pm

jackssmirkingrevenge wrote:Here's a barrel weight I made for a friend's rimfire CZ rifle:


Image

Nice work Jack. 8) Graduations are a nice touch.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 31, 2013 1:05 am

Cosmic Muffin wrote:So this is the spark plug Zeus was talking about...


Which I will post today, been a heck of a week :-/

Gippeto wrote:Graduations are a nice touch.


Cheers :) I realised that I had never used my 1/32" endmill so thought why not hehe
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Unread postAuthor: JDP12 » Thu Jan 31, 2013 4:04 pm

Forgive my ignorance, but what does a barrel weight do? is it to compensate for recoil?
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 31, 2013 4:07 pm

science heavy but a good read: http://www.varmintal.com/a22lr.htm
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Unread postAuthor: Labtecpower » Thu Jan 31, 2013 4:49 pm

JSR, how much would it cost me to have you machine this part for me?

Image

preferably machined out of some black plastic, tolerances aren't very tight except for the OD wich needs to be 15.95-16.05 mm.

Other sizes are just rough guidelines :D
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 31, 2013 5:36 pm

I haven't found a local source for black delrin so that would be 12 euro posted, 8 euro posted for white delrin. The question is time, travelling for work in a few days and will be back to my tools at the beginning of March so you might have to wait until then.
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