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Old 15th May 2006, 02:00 PM   #101
pixpop is offline pixpop  United States
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Quote:
What weight is that cartridge tracking at?
It's 2 grams. I don't know the recommended weight for this cartridge.. don't even know what kind of cartridge it is. I chose a weight that I might use with my good cartridge.
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Old 15th May 2006, 05:56 PM   #102
tubee is offline tubee  Netherlands
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Nice initial efforts done, Pixpop
I have a steel rod of old printer, might try this too here. How is the tracking, is the cantilever bending a little before the whole starts to move?
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Old 15th May 2006, 07:36 PM   #103
baggins is offline baggins  United Kingdom
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Well if youve got it tracking O.K. @ 2 gms I reckon your well on the
the way to a successful design. The vibrations you mentioned -are they at the audio frequencies because the cartridge is low compliance or are they being caused by the transport system itself?

Congratulations once again
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Old 15th May 2006, 07:47 PM   #104
baggins is offline baggins  United Kingdom
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Sorry Maxro,

Ive only just back - tracked the thread and seen your reply and yes if you use an underslung counter weight ( // tracker meets unipivot) you could be on to something apart from having to be careful when initially lowering the stylus .but unipivots have that anyway!
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Old 15th May 2006, 07:55 PM   #105
pixpop is offline pixpop  United States
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tubee -

I can't detect any lateral movement of the cantilever. There is no evidence of stick-slip motion, the whole thing seems to be moving slowly all the time. If in fact it is stopping and starting, the increments are too small to detect visually. Perhaps a test I could do would be to lower the stylus with the platter not spinning, and then watch what happens as it spins up.

Baggins -

I think the vibrations are due to the brass rod resonating. If I press on the rod with my finger, the vibration stops, so I don't think it's related to the cartridge or armtube. I think the rod is not rigid enough.

A solution is to use a thicker rod, and mount it more rigidly. But this will mainly serve to simply raise the resonant frequency and improve the Q, neither of which is helpful. Another solution would be to glue two rods together, one above the other, and make them of different materials.. e.g., brass and carbon fiber, to reduce the Q.
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Old 15th May 2006, 08:01 PM   #106
baggins is offline baggins  United Kingdom
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So the brass rod is resonating in tune with the platter motor vibration then?

A quick fix my be to just bond some square ramin (hardwood) to the underside this and the glue used should shut it up a bit.
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Old 15th May 2006, 10:32 PM   #107
owen is offline owen  United Kingdom
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Yup, if the magnet is very strong, then it will increase friction. However, if you mount the magnet at the apex of your inverted V, the air gap should temper the field strength enought to avoid that too much..



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Old 15th May 2006, 11:37 PM   #108
pixpop is offline pixpop  United States
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Quote:
o the brass rod is resonating in tune with the platter motor vibration then?
No, it's resonating with the music that's playing. Acoustic feedback.
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Old 15th May 2006, 11:42 PM   #109
arnoldc is offline arnoldc  Philippines
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Can the brass rod "rail" be shortened to minimize the vibration?
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Old 15th May 2006, 11:47 PM   #110
baggins is offline baggins  United Kingdom
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Sorry pixpop ,
I should have realised the source of the resonance.I wonder if my idea of using an arm made from Birch ply would overcome the feedback problem or just shift the frquency?
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