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Old 23rd February 2012, 08:08 PM   #5401
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Quote:
Originally Posted by Stixx View Post
I have a question for those who are messing with the Shigaclone longer than me.
I am using the Shiga with an Audiosector NOS DAC and have quite some problems to get it to lock...
Sometimes it will play music just fine... sometimes I only hear distant hum which makes me think of a grounding issue.
Neither DAC nor Shiga are connected to earth, all my other gear is...

Anyone encountered a similar issue or has some advice?
I had a problem that sounds similar. In my case it turned out that the culprit was the connection between the Shiga and DAC - one of the joints linking the digital ground to the socket was loose.
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Old 24th February 2012, 02:03 AM   #5402
c12mech is offline c12mech  United States
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Originally Posted by Ed LaFontaine View Post
Thanks Fran. I sense humility and read caution in your words.
I had the same feeling when I read what Fran had to say.

I wonder if stabilized wood would work? I know guys who use it for pens and other small turnings and I have tried it myself with good results. I'm sure it would not hurt to try.
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Old 24th February 2012, 10:25 AM   #5403
tvicol is offline tvicol  Romania
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There are two CD-mechanism for this project.
- SF-P101N-16P-DA11VZ (puck)
- SF-P101N-16P-DA11B3VZ (three ball)

I have not tested the three ball version, so Ill go for standard puck.
However, the single difference between them is CD clamp, so there will be no problems for those who prefer one or other.

Regards,
Tibi
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Old 24th February 2012, 10:40 AM   #5404
CeeVee is offline CeeVee  Portugal
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Just my 2 cents on the mechanism tests:

From my test, i have 2 mech of each type and although it's very critical on either , to get the right distance to lazer to have good focus and lock, the puck version gives consistently better sound, in my case at least.

Maybe because CD vibrates less...have to do more tests.

The puck version on the other hand would maybe benefit from a better magnetic puck, the stock one having a lot of side play represents an unstable rotating mass....bound to introduce focus distortion.

The previously posted new magnetic puck version might be worth a try but the lighter it is the better is my reasoning.
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Old 24th February 2012, 01:02 PM   #5405
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Ok, good that it's not just me. I'll go back and check the height of the disc above the laser....

Fran
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Old 24th February 2012, 01:07 PM   #5406
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Old 24th February 2012, 01:25 PM   #5407
TheGimp is offline TheGimp  United States
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The biggest issues I see with a magnetic puck are (1) the mass of the magnets and ferrous mating coupling surface, and (2) getting it balanced.

1) Mass is a - for accelerating the disk to speed, but may help maintain constant speed. Probably a wash. However, the mass may impact the servo feedback since it is the equivalent of capacitance in an LC circuit.

2) magnetic position is critical for rotational balance. Any eccentricity in the position of the magnets/coupling results in out of balance mass. This will cause vibration, modulation of the bit time, and poor tracking.
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Old 24th February 2012, 02:24 PM   #5408
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by TheGimp View Post
The biggest issues I see with a magnetic puck are (1) the mass of the magnets and ferrous mating coupling surface, and (2) getting it balanced.

1) Mass is a - for accelerating the disk to speed, but may help maintain constant speed. Probably a wash. However, the mass may impact the servo feedback since it is the equivalent of capacitance in an LC circuit.

2) magnetic position is critical for rotational balance. Any eccentricity in the position of the magnets/coupling results in out of balance mass. This will cause vibration, modulation of the bit time, and poor tracking.

Agree with all the above but it still beats the other option because the CD remains on a flat plane with fewer vertical vibrations.
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Old 24th February 2012, 03:41 PM   #5409
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If this is the case, then I submit that the difference is due either to a difference in design (different support area, etc), or to tighter manufacturing tolerances rather than the use of magnets.
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Old 24th February 2012, 05:11 PM   #5410
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I was able to just use a donut shaped magnet in place of the puck and it worked pretty well.
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