[modeleng] Lapping, pumps, etc was Why is it so quiet?
- From: Harry Wade <hww@xxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 19 Feb 2006 11:35:35 -0600
At 08:11 AM 2/19/06 -0800, you wrote:
>#1--What materials were used in full sized practice and WHY cannot the
same material be used in our models?
Al,
Not applicable. I've never heard of a full size loco with an axle
pump, only crosshead pumps. Besides, there are conditions where the
materal used in full size will work well on a model, and places where it
won't.
>#2--WHY must the inside of a pump bore be lapped
It's not that it's a "must", but the smoother the bore the longer the
O-rings will go between needing replacement, or so I believe. Now is the
time to do it, before it's time to cut the chucking piece off the pump body.
Regards,
Harry
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