[modeleng] Re: Soft Packing
- From: "Terry Lane" <tel@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 18 Mar 2005 09:37:00 +1100
normally you would leave the depth of the groove a bit under the packing
thickness and then cut the packing dead to size, now roll the packed piston
on a hard, flat surface to compress it down to the level of the side of the
piston & shove it in the 'ole. If you grooves are already cut you could try
putting a ring of (say) 0.005" brass shim in the bottom of the groove.
----- Original Message -----
From: "John Pagett" <john.pagett@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, March 18, 2005 9:17 AM
Subject: [modeleng] Re: Soft Packing
> Gents,
> My problem is the soft packing of the pistons on gunmetal cylinders, not
> the glands for the piston rods.
>
> I can get the square packing in, it just doesn't seem to stop the steam
> from flowing past! One of our club members suggests packing it in really
> tight - i.e. an overlength piece of packing compressed lengthwise as it
> is pushed in to "fatten it up". I think this is better but how much over
> length should it be? pistons are 1" diameter with 1/8" x 1/8" groove.
>
> Should I be aiming for a completely steam tight seal?
>
> Thanks,
>
> John
>
> alan wrote:
> > For the square packing in cylinders, a diagonally cut with a shallow
angle
> > works best.
> >
>
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