[net.audio] Don"t Listen to Bad Anti-Skate Advic

hrs@houxb.UUCP (H.SILBIGER) (04/30/84)

Skating force is the resultant (pun) due to the angle of the
arm, the friction of the stylus on the record, and the arm mass.
A groove only increases the friction.
For those who have had physics or mechanics, it is a very
simple problem to show that the skating "force" does not
depend on whether there is a groove.
Those who have not had physics can verbalize on skating
force forever.

Herman Silbiger CGE

pmr@drutx.UUCP (Rastocny) (04/30/84)

In reference to anti-skating and arm alignment hype, please read the
following articles.  These people have already done their homework on
these issues:

1.  Baerwald,  H.G., "Analytic Treatment of Track-
    ing Error and Notes on Pickup Design," Journal
    of  the  Society  of Motion Picture Engineers,
    37:591, December, 1941.

2.  Bauer,  B.B.,  "Tracking Angle in Phonographic
    Pickups," Electronics, March, 1945, page 2.

3.  Seagrave,  J.D.,  "Minimizing  Pickup Tracking
    Distortion,  Part I," Audiocraft, 1:19, Decem-
    ber, 1956.

4.  Seagrave,  J.D.,  "Minimizing  Pickup Tracking
    Distortion,  Part II," Audiocraft, 2:25, Janu-
    ary, 1957.

5.  Seagrave,  J.D.,  "Minimizing  Pickup Tracking
    Distortion,  A Sequal,"  Audiocraft, 2:22, Au-
    gust, 1957.

6.  Hiscocks,  P.,  "Tonearms," Audioscene Canada,
    November, 1967, page 64.

7.  Kogen, J.H., "Record Changers, Turntables, and
    Tonearms - A Brief Technical History," Journal
    of the Audio Engineering Society,  25:749, Oc-
    tober/November, 1977.

8.  Bauer,  B.B.,  "The  High-Fidelity  Phonograph
    Transducer,"  Journal of the Audio Engineering
    Society, October/November, 1977.

9.  "Have Tonearm Designers  Forgotten Their High-
    School Geometry?" Audio Critic, 1:31, January/
    February, 1977.

10. "Cartridge/Arm/Turntable Followup:  Loose Ends
    and  New  Developments,"  Audio Critic,  1:43,
    Spring/Fall, 1978.

11. Stevenson, J.K., "Pickup Arm Design," Wireless
    World, May & June, 1966.

12. Kessler,  M.D. and Pisha, B.V.,  "Tonearm Geo-
    metry  and  Setup  Demystified," Audio, 64:76,
    January, 1980.

13. Pramanik,  S.K.,   "Understanding   Tonearms,"
    Audio, 64:52, June, 1980.

14. Goodman,  B.,   "Phonograph  Arm  Geometry:  A
    Graphical  Method,"  Audio  Amateur,  January,
    1980.


		Yours for higher fidelity,
		Phil Rastocny
		AT&T-ISL
		..!drutx!pmr

schamberlain@wateng.UUCP (Ray Chau) (05/02/84)

A very good set of references indeed. Thanks.

In mechanical terms, the skating force on a tonearm is the 
resultant moment generated due to a force not in line with the 
rotational axis. ie An isolated body with a net unbalanced force (groove 
friction) can be translated into an equivalent moment and a force
through the pivot (having no moment).

Ray

P.S. it does sound confusing, doesn't it?