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Old 23rd December 2012, 09:23 PM   #21
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Join Date: Mar 2004
Location: Belgrade RS
Quote:
Originally Posted by madmike46 View Post
Here I have the arrow shaft set up in the mill to grind a 19 degree angle for the head shell.
22 degree!

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Old 23rd December 2012, 10:24 PM   #22
49 - for the 18th time
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Quote:
Originally Posted by zeonrider View Post
22 degree!

Regards zeoN_Rider
Sometimes that depends on the design of the arm. Here is a classic article to take a look at. I haven't done the math for a 10.5 in arm so I'm not sure as to what the angle should be.

http://www.helices.org/auDio/turnTable/stevenson.pdf

According to Fig 6b it looks as if 19 degrees is bang on for a 10.5 inch arm - but hey - I'm a big dummy - just ask ZM.
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Last edited by c2cthomas; 23rd December 2012 at 10:36 PM.
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Old 23rd December 2012, 10:37 PM   #23
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Originally Posted by c2cthomas View Post

Too old!

22-23 Twisting your cartridge in the headshell | Vinyl Engine

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Old 23rd December 2012, 10:40 PM   #24
49 - for the 18th time
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Originally Posted by zeonrider View Post
Yeah - but then I am an old dude now!!!! (And I'm grateful for every day that I get to hang around here and learn some new tricks. )
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Old 23rd December 2012, 10:43 PM   #25
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Originally Posted by c2cthomas View Post
Yeah - but then I am an old dude now!!!! (And I'm grateful for every day that I get to hang around here and learn some new tricks. )
I'm not much younger!


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Old 24th December 2012, 12:49 AM   #26
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I am just going by this for the angle of the cartridge http://welltemperedlab.files.wordpre...ment-guide.pdf
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Old 24th December 2012, 12:53 AM   #27
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Here is another reference ToneArm Geometry Well Tempered Lab Blog
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Old 24th December 2012, 01:19 PM   #28
pdm4606 is offline pdm4606  United States
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Location: Las Cruces, NM
Default long arm

I wonder how a really, really long arm would work.
Possibly in the range of 25 to 35 inches.
By theory tracking error at the center null point (using Boerwald) should go down drastically if the present idea that a shorter arm makes the null point error increase drastically.
The technology is there as seen by these great pics.

Paul
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Old 24th December 2012, 04:30 PM   #29
a.wayne is offline a.wayne  United States
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How does it compare to a uni-pivot ....?
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Old 24th December 2012, 07:48 PM   #30
pdm4606 is offline pdm4606  United States
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Default uni-pivot

Really a different animal. I never had a uni but remember the old Stanton or Pick. that was a uni.
My arm is just plain bearings that I replaced with DIY bearings due to age.
The arm is very rigid.
I have often thought about trying to make a uni. but was very happy with the fact that I finally got my ROK arm up and running. It took 25 years until I had time.
If I did a uni. I would make it very much longer. I remember making a uni. way back in the 50's but I didn't know it was a uni.
I use wood and it was 48" long with a GE VR II mono cart. The arm sounded as good as an untrained ear can manage. I didn't have the knowledge at the time being in high school and gave up due to issues.
Over the years being a certified journeyman tool & diemaker my knowledge level is pretty broad and being retired gives me the time.
I recently connected with a machinist(hobby) that has a full machine shop. 2 big lathes and 2 Bridgeport milling machines at his house. He has much equipment but limited practical machine knowledge. He just loves working on the machines. I am working on a uni. idea that would require the use of his mill and lathe.
Plans are for after the first of the year as he is also retired and travels a lot.

Paul
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