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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: Technician1002 » Fri Oct 14, 2011 9:33 pm

The guys up here are willing to train me to use this lathe. Here is a size example..
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Lather chuck.
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Unread postAuthor: warhead052 » Fri Oct 14, 2011 9:57 pm

:O NICE! What would you turn on it?
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Unread postAuthor: mattyzip77 » Fri Oct 14, 2011 9:58 pm

hmmm, if you machined a piston on that beast you would have to use car tires as o rings!!!! :shock: :shock: :shock:
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Unread postAuthor: CooperJS » Fri Oct 14, 2011 11:49 pm

That would be sooo awesome getting to use a lathe like that :D

:O NICE! What would you turn on it?


probably machine things for industrial use and maybe big crankshafts or just really big pistons :D
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Unread postAuthor: Technician1002 » Sat Oct 15, 2011 12:41 am

They have used it to re-manufacture or make replacement parts for the steam train. The manufacture no longer makes steam trains or parts.

What was more interesting in the shop was this beauty.

Spent the day as Fireman on this while we shuffled rolling stock to make up the train for the Photo tour tomorrow. The train is now ready for the photo run. I'll get more photos tomorrow.

I had the chance to be engineer for about 15 minutes and run the train through a switch and back it up to some of the cars. It was all low speed stuff, but lots of fun anyway. It was my first time running a steam engine.
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Using the speeder to pull the engine out of the shop.
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Learned how to use these. Air brakes..
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They left the ignition key in the cab.
IMG_0276a.JPG
Looking back at the shop from the cab. This is where we fired it up. I was Fireman for the day.
IMG_0293a.JPG
This air compressor on the side of the engine gave some trouble. They got it working. It is for the brakes. It runs off steam and provides 100 PSI. The steam turbine and dynamo for my project can be seen on top between the headlight and stack.
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 15, 2011 4:45 am

They left the ignition key in the cab.


:D

Amazing stuff Tech!
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Unread postAuthor: Labtecpower » Sun Oct 16, 2011 11:16 am

I'm working on a new 1" QDV, and I need a piston for it.
In the following weeks I won't be able to machine anything, so maybe I can purchase one from an european member?

drawing:

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Unread postAuthor: jackssmirkingrevenge » Sun Oct 16, 2011 11:20 am

I can rustle that up out of acetal very quickly (after I'm one with the knife ;)) if you want.
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Unread postAuthor: Labtecpower » Sun Oct 16, 2011 11:21 am

That would be great!

How much would it set me back?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 16, 2011 11:23 am

I think ten euros including postage is fair, let me know if you disagree :)

edit: one point that might or might not be important, does it matter if the shoulder in the central hole has a taper from the drill bit, or does it have to be at 90 degrees?
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Unread postAuthor: Labtecpower » Sun Oct 16, 2011 12:06 pm

I think ten euros including postage is fair, let me know if you disagree :)


I completely agree :wink:


edit: one point that might or might not be important, does it matter if the shoulder in the central hole has a taper from the drill bit, or does it have to be at 90 degrees?


As long as a M4 / M5 nut doesn't fit trough, i'm happy :)
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 16, 2011 12:29 pm

Labtecpower wrote:I completely agree :wink:


ok :) also a 1 euro donation to PC guy ;)

As long as a M4 / M5 nut doesn't fit through, i'm happy :)


No worries, should have time to do it tomorrow, watch this space.
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Unread postAuthor: Labtecpower » Sun Oct 16, 2011 12:50 pm

ok :) also a 1 euro donation to PC guy :wink:


Always a good thing to do :)


No worries, should have time to do it tomorrow, watch this space


You don't have to hurry, tomorrow I have a party and i'll need the whole tuesday to recover from it :D
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Unread postAuthor: Technician1002 » Sun Oct 16, 2011 3:35 pm

Is there any reason that piston is so long? Shave the length and save weight. There is a sketchup drawing of one of my pistons. Thanks Dewey for the drawing. This fits 1 inch galvanized iron pipe that is sanded out smooth.
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Unread postAuthor: Labtecpower » Sun Oct 16, 2011 4:23 pm

I used wide ports again, and I won't be shooting very light projectiles.
I don't think the piston will weigh more than the projectiles.

A slightly longer piston is also easier to seal, it doesn't need a very precise triggering rod.
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