> hi: because it is expensive to have White Post Restorations do it, i
> thougt that i might try sleving a brake wheel cylinder with brass myself.
> i plan to start with a scrap cylinder. does anyone know the general
> proceedure ?
Fred, I've never done it, but I'm somewhat interested in learning to do it
myself. More because I like knowing how to do things than because of the
ridiculous prices charged by White Post.
> i guess the following: 1. use lathe to bore cylinder
> oversize (how
> much ?)
Depends a bit on what you have to use for an insert, but thinner is probably
better here. Removing too much may compromise the strength of the cylinder.
I would _guess_ that a final wall thickness of 1/16" would be about right,
so 1/8" oversize. Obviously you'll need quite a bit thicker walls when
pressing, so your insert will have a smaller id when it's pressed in, and be
bored out in place.
> 2. insert brass bushing ( how
> tight ? heat cylinder first ? )
Again just a WAG, but given the limits of my skills, I'd probably shoot for
around .000 to +.001". The brass will crush as it's pressed in anyway, so I
don't see any point in using heat.
> 3. bore brass to original inner
> diameter.
Need a very smooth finish here, I believe the pros ream with plenty of
lubricant as the final step. Have to be careful to prevent heat buildup,
otherwise the bore winds up being tapered; and take small cuts so the reamer
doesn't grab the insert. Probably tough to keep it from winding up tapered
with a boring bar, too. Might not be as much of an issue with a brake
slave, but I was planning to start with a clutch slave.
> 4. drill holes for feed line and
> bleed hole.
Depending on the cylinder, this may not be necessary.
If you get any off-list replies, please summarize them for the list.
Randall
|