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Measuring spindle to pivot distance?

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Posted on October 13, 2020 at 12:45:45
SteveBrown
Audiophile

Posts: 2454
Location: Portland, OR
Joined: November 14, 2002
 Maybe I'm over complicating this.. I need to drill a new arm board (for a TD124 / Series 6 Audiomods combo). This is the same geometry as a Rega RB250 - 222mm. I thought the device I linked below would do it, but the vendor says no. Is it just a simple measurement? Or is there more to it than that?
Thanks
Steve

 

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RE: Measuring spindle to pivot distance?, posted on October 13, 2020 at 13:49:30
andyr
Manufacturer

Posts: 12548
Location: Melbourne
Joined: September 2, 2000
 I would've thought that device would be able to give you a 222mm distance from the spindle?

But, yes, all it is ... is a simple measurement (to the centre of the spindle).

Andy

 

RE: Measuring spindle to pivot distance?, posted on October 13, 2020 at 15:25:59
B. Scarpia
 Sorry to hear the Nerve Audio doesn't do it.

What I did for just a few Bucks: Buy a cheap metal metric ruler graduated in mm's. Carefully drill a spindle-sized hole at 1 cm. Another at 232 mm. small/large enough to press fit a finish nail in it. Jockey the finish nail around to ensure where you drill for the arm post places the arm assembly where cueing lever, etc. allows all the room you need front and back, side-to-side and tap the nail.

Starrett 500 mm ruler, or $10 bucks for a HOme Depot cheapy

 

RE: Measuring spindle to pivot distance?, posted on October 13, 2020 at 16:09:41
SteveBrown
Audiophile

Posts: 2454
Location: Portland, OR
Joined: November 14, 2002
 Thanks!

 

RE: Measuring spindle to pivot distance?, posted on October 14, 2020 at 22:38:15
dogwan
Audiophile

Posts: 871
Joined: December 16, 2004



I use a simple pair of trammel points. The end that accepts a golf pencil is just right to slip over a TT spindle. Of course you do have to account for the difference in height. I use the pivot (pointy) end to scratch an arc at the prescribed distance. Then I figure out where on the arc I want to place the tonearm.

Note: the pencil holder end unscrews and you can put in the other point and then use that to set the distance between centers on a ruler. You also need to make sure the micro adjuster is set so that the point is square to the trammel bar.

 

RE: Measuring spindle to pivot distance?, posted on October 15, 2020 at 07:17:53
SteveBrown
Audiophile

Posts: 2454
Location: Portland, OR
Joined: November 14, 2002
 Looks very interesting, thanks for the tip!

 

I did something similar, posted on October 16, 2020 at 08:22:23
Batman
Audiophile

Posts: 4194
Location: Western Pennsylvania
Joined: March 31, 2000
Contributor
  Since: June 16, 2000
 A metric ruler with an empty sewing thread bobbin (it's hole is exacctly 1/4 inch. With a nail at 222mm. Works like a charm for a few cents






 

RE: Ban The Hypotenuse!, posted on October 16, 2020 at 10:37:09
B. Scarpia
 Before I saw your pic, just reading the AA e-mail, I worried the spool would raise the ruler at one end. I guess that piece of clear plastic allows the already mounted arm post position to adjust?

Keeping the ruler flat, obviously, is essential for finding where to drill the hole in an armboard w/o an SME type adjustment.

 

yes, posted on October 16, 2020 at 10:47:01
Batman
Audiophile

Posts: 4194
Location: Western Pennsylvania
Joined: March 31, 2000
Contributor
  Since: June 16, 2000
 The pic doesn't make that clear.


 

RE: Measuring spindle to pivot distance?, posted on October 16, 2020 at 13:59:28
B.K.
Audiophile

Posts: 1092
Location: California
Joined: February 18, 2007
Contributor
  Since: March 12, 2007
 You can use this device.

You just need to use the Pythagorus theorem to calculate the distance between the slider and the pin along the main metal shaft.

Best regards,

 

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