THANKS Ralf,
I tryed with both ears and 33 rpm and 45 rpm.
Mesurements to come soon.
Hi!
You are industrious clever!
Excellent work!
It is waiting for completion of the project!
Sincerely, AlexПрослушать
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https://sites.google.com/site/agalkaaudio/
I tryed to get a few examples on the net, but I have found different kind of tangential tonearms. Then I asked to one of the shops where we buy parts for our machines. Smaller diameter has less resistance, but less presicion too. In fact they have given me a couple of 3 kind of linear bearings (D12-D14 and D16), I have done a test and the best was D16.
And I have also seen something interesting, when I put load on the bearing, the translation is smoothly better. That's why instead of doing the sliding cart with aluminium, I'll do it in stainless steel. Here is the drawing of the cart (where the linear bearings are):
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It's also in my plans, a short S type made with thuya burl, and a long straight one may be in carbone, I don't know yet.
SME, LINN or REGA, is the B plan if I'm not happy with one of the tonearms I'll made.
Hello doitmyself
If the carriage starts to move at 5 degrees, that is a coefficient of friction of .087 which is way too high. An ABEC 7 instrument ball bearing has a coefficient of friction of only .004. Once you add the tone arm and its counterweight the coefficient of friction will likely go down. I agree with "dtut" that lubrication would matters worse. Did you make sure one of the ball circuits in each linear bearing is located at top dead center i.e. 12 o'clock?
Also, do you intend to use the linear bearings for the vertical motion of the tone arm?
If you can't reduce the coefficient of friction, you may have to design a new carriage, using individual instrument ball bearings.
Sincerely,
Ralf
If the carriage starts to move at 5 degrees, that is a coefficient of friction of .087 which is way too high. An ABEC 7 instrument ball bearing has a coefficient of friction of only .004. Once you add the tone arm and its counterweight the coefficient of friction will likely go down. I agree with "dtut" that lubrication would matters worse. Did you make sure one of the ball circuits in each linear bearing is located at top dead center i.e. 12 o'clock?
Also, do you intend to use the linear bearings for the vertical motion of the tone arm?
If you can't reduce the coefficient of friction, you may have to design a new carriage, using individual instrument ball bearings.
Sincerely,
Ralf
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I do not know how much 0,087 is in gram but it may have 1,5 gram force to move, it would me perfect.
I think to make that assembly as light as possible is also a must, to let the arm follow a not perfect flat record. And to reduce friction and the forces that come with the friction. The assembly is unnecessary bulky now. Make it hollow on the bottomside is maybe a good idea.
It would also possible to reduce the construction to one linear ball bearing, instead of the two you need with this construction.
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