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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: Sparkie » Thu Dec 29, 2011 5:16 pm

Quick question:

Does anyone use fresh engine oil when cutting on a lathe to help the bit cut?
I have cutting oil but its getting low and need to use something else in the mean time
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Unread postAuthor: velocity3x » Thu Dec 29, 2011 7:15 pm

Sparkie wrote:Quick question:

Does anyone use fresh engine oil when cutting on a lathe to help the bit cut?


Motor oil will smoke and stink like hell, but it works.
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Unread postAuthor: jrrdw » Thu Dec 29, 2011 8:13 pm

I would use water before using oil.
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Unread postAuthor: ramses » Thu Dec 29, 2011 8:41 pm

Definitely. I think the motor (oil) is specifically designed to prevent machine tool like processes from happening in engines.

Edited by jrrdw.


And I apologize for my rant.
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Last edited by ramses on Wed Jan 04, 2012 7:24 pm, edited 1 time in total.
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Unread postAuthor: JDP12 » Wed Jan 04, 2012 2:05 pm

hey all, need some more stuff machined.

I need six of each of these designs. Should be made out of some sort of steel, preferably harder steel as they need to penetrate.

Someone wants to give me a quote that'd be great.
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Unread postAuthor: jakethebeast » Wed Jan 04, 2012 3:37 pm

i could propaply make that Negishi Ruy shuriken, i just need better picture heh :D
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Unread postAuthor: JDP12 » Wed Jan 04, 2012 6:30 pm

What do you Mean by better picture? More details?
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Unread postAuthor: Lockednloaded » Wed Jan 04, 2012 10:59 pm

I'm not really sure if this is what we're doing in this thread, but I'm just posting thanks to jrrdw. He machined some nice pistons for my hybrid!

Image

My creation is the ugly PVC and epoxy one in the middle :lol:
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Unread postAuthor: jakethebeast » Thu Jan 05, 2012 3:21 am

detail, yes. i just can't get anything from that picture
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Unread postAuthor: Gun Freak » Thu Jan 05, 2012 11:31 am

I has lathe

Parting
Image
Done
Image

Random cuts in a wooden dowel

Edited by jrrdw.
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Unread postAuthor: jrrdw » Thu Jan 05, 2012 4:35 pm

jakethebeast wrote:detail, yes. i just can't get anything from that picture


They are approx. .832" in diameter, drilled through and tapped M6 X 1.0 pitch threads and plugged with set screws sealed with Loctite. Don't know the length, I just used the PVC piston as a measure for the length only. The diameter was custom fitted to the cylinder with a clearance of approx .001"/.0005".

The off the shelf brass fittings are NOT machined to exact tolerances making it very hard to get exact measures. Further more are not made with enough thickness to machine to create exact tolerances. To do so in this case would have created weak spots not worthy of safely using this configuration.
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Unread postAuthor: jakethebeast » Thu Jan 05, 2012 5:55 pm

jrrdw: i mean't the shuriken's :D
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Unread postAuthor: jrrdw » Thu Jan 05, 2012 6:15 pm

jakethebeast wrote:jrrdw: i mean't the shuriken's :D


Ooooops :oops: !
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Unread postAuthor: ramses » Fri Jan 06, 2012 11:23 pm

Finally finished that receiver. The final bore came to 0.640

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Image

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Unread postAuthor: warhead052 » Fri Jan 06, 2012 11:24 pm

Wow ramses. Nice! I assume its going on a 3way + qev + pneumatic cylinder combo?
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