I am looking for more information on single plane and 2 plane balancing on a hard bearing stand where distance calculations are used for plane separation. Victor Wowk briefly mentions one of these calculations in his book, but unfortunately, he does not elaborate on how to solve the problem, and it is one of the only times in the book where he does not go over an example problem! I already have a good understanding of Single plane, Static couple, and 2 plane using influence coeficcient. But I know that there is more that you can do on a hard bearing balancer with these distances as a permanent rotor type calibration. Any info, publications, or help would be MUCH appreciated!
Thanks
Andy

Andy, you might want to check at the Schenck-trebel site. (http://www.schenck-usa.com/index.asp). When you get there go to the "library" link along the top. You'll have to register but I haven't found that much of an issue.

John from PA

I would concur with John about Schenck-Trebel. I have a very good book by them , circa 1980, called Fundamentals of Balancing wher they go right through all the math involved with a hard-bearing balancing machine. I don't think I can copy this to you as I don't own the copyright.
You could also contact them at 535 Acorn Street. Deer Park Li. NY 11729. Tel. (516) 242-4010. (At least that's where they were back in 1980!

Ahhh caveman, I was actually looking for your email address, I did a search yesterday and saw that you had a copy of that manual scanned. But I see that they do have it in the library for $25.00. I may go that route now that someone has confirmed that this information is in the book.

Thanks

The book by Hatto Schneider may be a good reference - I don't have the book, and I can't find a reference to a version in English (Shenck may have one.)

http://books.google.com/books?id=X4q4kH4i78UC&dq=%22hat...ay1P1Mn8twgA#PPP1,M1 points to the book

Thanks Bill. I did get the Fundamentals of Balancing from Schenck. Although packed with lots of great information(although the technology portion is dated) it makes no mention of hard bearing math. I think what I am going to do is a regression curve on a series of two plane influence coeff. runs, varying the plane separation distances, bearing distances, and see what kind of data I come up with. I may have to usa a vector machine calculation, as I think there are going to be to many variations.
I wish I was better at math, I could probably come up with something much better.

AP

Have you tried to e-mail Victor for an example? Here is the link to his company. http://www.machinedyn.com/

A hard bearing balance machine measures the forces at the rollers (at two points). About a choosen point on the rotor (or not on it, but that would be wierd)this corresponds to a force and a couple (moment).

The force and moment for a rigid rotor result from center of mass eccentricity and skew of a principal axis of inertia from the line of rotation. The mass corrections at two axial location solves the force and couple measured by the machine at the balance speed.

This falls under the subject of rigid body dynamics. Look for mass properties, etc. in text books.