[modeleng] Re: Why is it so quiet?

Well, Harry, here goes:

#1--What materials were used in full sized practice
and WHY cannot the same material be used in our
models?  I'm using ground Stainless in mine and if I
have to replace it after several years, I can do that.

#2--WHY must the inside of a pump bore be lapped
instead of just a good bored or reamed finish?  Isn't
the rings/packing job to take up any small
irregularities in the finish of the bore?

Just the rambling thoughts of a total newbie.

Al Messer

--- Harry Wade <hww@xxxxxxxx> wrote:

>        There is always the "other" ME list where of
> late the conversations
> have centered around such compelling subjects as
> manure, bovine and
> chicken, among others.  Fascinating reading.  :-) 
> I've been quiet  because
> I've been busy handling life, juggling the care of
> unwell and aging parents
> with a full work schedule and deadlines.  It's just
> that time of life.
>         Workshop-wise I've been getting a little
> done but what little I've
> been able to do has been taking me closer toward the
> material wall - that
> point at which I can no longer make substantial
> additional progress without
> biting the bullet and buying some expensive
> materials.  At that point we
> pause, . . take a couple of deep breaths, . . and
> pull out the checkbook.
> It's a good time to pause though because there are
> some design and material
> selection choices to be made, and best not made in
> haste.
>         I have a couple of questions for the list
> though, now that we are
> at it, about axle water pumps.
>         #1 - I know that for some years Monel has
> been recommended or
> specified as the ram material because it is less
> susceptible to galling
> than stainless and I wondered if anyone is or has
> used it and what your
> results were.  I can't seem to find it in a ground
> finish at any price (see
> checkbook above) so would turn and grind my own from
> oversize stock.
>         #2 - I have bored (not reamed) my pump body
> (.500" diam x 2.5") and
> would like to put a lapped finish to it.  I have a
> 1/2" split brass lap but
> I can't afford to buy a series of lapping compunds
> at $$ per grit.  Any
> suggestions as to how to proceed?  It may very well
> be that for a one-off I
> would come off better sending this out to a
> commercial lapper.
> 
> 
> Regards,
> Harry Wade
> Nashville  Tennessee
> 
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