Thank you Bill.
I keep threatening to make a manometer to test squirrel cage fans for my foundry furnace and then never do.
Have a good one. Try to think amateur machining.
Barry
From: Bill Williams <BWMSBLDR@PeoplePC.com>
To: GrizHFMinimill@yahoogroups.com
Sent: Saturday, September 3, 2011 10:13 AM
Subject: Re: [GrizHFMinimill] Re: Enco free shipping code
Barry Young wrote:
> OK Bill, I will bite. What is an inclinable comb manometer and how is it
> used to measure flatness of a surface especially those pesky Alfa heads?
> I mean we all know what a manometer is, it is a low pressure gage using
> the difference of levels of a liquid in a tube to measure pressure
> similar to an inclinometer. The comb obviously replaces the traditional
> scale we have come to know and love on manometers, but the inclinable
> part has thrown me which I am more than certain was the point of this
> rather ostentatious post. So spill! what are you talking about, how can
> we use it in our hobby and please be sure to tell us how to build one
> from random crap lying about the ordinary amateur machinist's workshop.
> Thank you
> Barry Young
Barry, I was not trying to do as the academic expression goes:
"If you can't blind them with your Brilliance;"
"Then baffle them with your Bullshit!"
But rather I was drawing upon my experience with surface plates to find
the most outrageous example! Firstly a comb manometer is several
parallel tubes sharing a common reservoir and all in a common plane.This
last is important if you want all of the readings to be relative to each
other. A test of this commonality is to apply the same pressure to all
of them to see if you get the same results. The second test is to slope
the set of manometers so as to spread the travel along the tube for a
given rise in the fluid height. If you can get the manometer to give
good readings at a 10:1 slope then you have done well!
By routing the tubes and manifolds in the front of one sheet of
Plexiglas and then bonding another sheet to the first while caught
between two surface plates I was able to maintain the flatness of the
tubes as well as get a lot in a small space. The object of this exercise
was to measure the flow of air through a two stroke engine cylinder and
thus evaluate the porting. A long ago effort in the pursuit of a Masters
degree at a time when two stroke cycle engines were in great disfavor!
Now as you can see this has nothing to do with nervous Alfa owners
other than the the surface plate. In fact I would doubt that
any of our list members would ever need a manometer let alone a bank
of them!
Bill in Boulder
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