[simpits-tech] My first lathe attempt

[Craig Rochester]

I bought a Taig lathe and am trying to turn a piston for my G-suit regulator
rig.
http://pages.zdnet.com/johncraigrochester/sitebuildercontent/sitebuilderpict
ures/new_qev.jpg  Here's a sketch of the piston :
http://pages.zdnet.com/johncraigrochester/sitebuildercontent/sitebuilderpict
ures/piston.jpg

I'm making it out of 1.5" Delrin rod.  I have to turn the diameter down by
0.020" and cut groves for two cup seals.  I got the lathe set up, the 1.5"
diameter rod set in the 4 jaw chuck and aligned.  I needed a "dial gage" to
get the bar aligned properly.  Not having one, I used the "gage head" LVDT
from my stick-base project and it worked great.  I used a bit that came with
the lathe(shaped like a clothes iron) to try turning the OD.  I'm sure I'm
not doing it right, but it worked OK, I've still got all my fingers. :)

The cup seal grove needs to be very smooth (15 microinches).  Anybody
willing to advise me on how to proceed?  Could I use a thin wood chisle and
grind it to the proper width, and then dial it staight in?


Thanks,

Craig R.



-----Original Message-----
From:	simpits-tech-admin@simpits.org [mailto:simpits-tech-admin@simpits.org]
On Behalf Of James Hallows
Sent:	Saturday, December 28, 2002 7:54 PM
To:	simpits-tech@simpits.org
Subject:	Re: [simpits-tech] Vero/Prototype board layout programs?

At 11:46 24/12/02 -0600, you wrote:
>Hello James,
>
>Congradulations on your new house!

Aah - well it's not certain yet. But I hope it comes together as it's got a
double garage and that means room for a pit ;)

>( and the move to the bottom right hand corner of the UK)

That's where we used to live - we're now in Bristol/Bath - bottom left.
It's where "Double-0-Two" - the first British-built Concorde had her maiden
voyage in May 1966, when it took off on the short flight from Filton
Airfield to Fairford in Gloucestershire. It's also the home of Rolls Royce
and BAE Systems, just to put it on the map ;)

>My travel plans are not completely nailed down yet, but Ill let you know as
>it comes into foucus.

Yup do that.

>  I know you are busy, so if its too hard I understand.
>I will be going to Europe many times in 2003, so maybe on one of those hops
>I can meet up with you.

Definitely Chris. When we've got our house you've got a place to stay
whenever you need to.

Cheers

James

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Thanks!