Moment of Inertia of grand action parts.

[Don A. Gilmore]

Hi John:

Well, you did the math right and got the correct answer, but there are a few
minor discrepancies in your formulas in step 2.  Step 1 looks great.

You state the formula for angular acceleration correctly, but you have shown
angular acceleration as w^2.  I'm assuming that this denotes angular
velocity squared (I have been using w for angular velocity in my posts, but
it's usually denoted by a small omega, which looks like a roundish w).
Angular acceleration is not the square of angular velocity.  If it were it
would have the units "square meters per second squared".  Angular
acceleration is usually denoted with a small alpha.  Also, you call the
downward force F in the diagram, but N in the formula...just a typo.

Otherwise it looks good.  I'm glad to see you convert newtons to kg-m/s^2 as
this makes the units more understandable.

Good job.

Don A. Gilmore
Mechanical Engineer
Kansas City


----- Original Message ----- 
[link redacted at request of site owner - Jul 25, 2015]
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, December 27, 2003 6:41 PM
Subject: Re: Moment of Inertia of grand action parts.


> Don A. Gilmore wrote:
> > This one looks great, John.  Can you send me the other ones you
mentioned?
>
>
> O.K. Ron,
>
> I will send one at a time since the list seems to reject attachments
> over 30 k.
>
> So here is the first one.
>
> John Hartman RPT
>
> John Hartman Pianos
[link redacted at request of site owner - Jul 25, 2015]
> Rebuilding Steinway and Mason & Hamlin
> Grand Pianos Since 1979
>
> Piano Technicians Journal
> Journal Illustrator/Contributing Editor
[link redacted at request of site owner - Jul 25, 2015]
>
>


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