quiddity
Responses from quiddity
| Anti skate and tonearm damping query Perrew I cannot see how you can get to that conclusion. Axelwahl I love how you can take a simplification and twist it until it becomes a complexity. Your jump from "no groove" to "no tangent" is unjustified.The frictional force vector is in the d... | |
| Anti skate and tonearm damping query AxelwahlI think I have confused you by trying to simplify things. The angle I referred to as the true offset is the angle between the groove tangent and the line between the stylus and pivot. The frictional force acts along the tangent so this is ... | |
| Anti skate and tonearm damping query Axelwahl Go back and read my post 15 above this one. Mark Kelly | |
| Anti skate and tonearm damping query Axelwahl I have a simple test for you. If possible, adjust your arm to zero overhang and check the skating. It will have changed very slightly (due to the change in offset angle) whereas if I read your theory correctly you would expect no skating... | |
| Anti skate and tonearm damping query Perrew Unfortunately I can't do that without revealing details of my tonearm's geometry which are not yet ready for publication. Sorry.Axelwahl You have changed the offset angle (because the SME overhang adjustment works by moving the pivot not th... | |
| Anti skate and tonearm damping query HDMThe reason tonearm manufacturers put a scale on the antiskate corresponding to VTF is that the skate force is directly proportional to VTF, not that it equals VTF. The constant of proportionality has already been factored in and the manufactur... | |
| Anti skate and tonearm damping query Oops The Xs and Ys are reversed. Consider the arm lying along the X axis with the Y axis pointing down and it comes out right. Sorry about that Mark Kelly | |
| Anti skate and tonearm damping query Doug I find your argument a little confusing. If one did as you say and merely twisted the cartridge in the arm while keeping the alignement of the arm WRT the groove tangent the same, you would create very little force, as my post above explains... | |
| Anti skate and tonearm damping query Axelwahl You are assuming attitude is important but it isnt. Consider the frame of reference of the tonearm with its pivot point as the origin and the arm lying along the y axis. The stylus frictional reaction force vector runs directly from the ... | |
| Anti skate and tonearm damping query Stringreen That is not correct, stylus friction follows the classic Amonton law so the friction is independent of velocity. This can be confirmed by a modification of the test Doug Deacon used to demonstrate that Dertonarm's idea was completely fa... | |
| SME V effective mass.......again Not very much. If you add 5 grams to the cartridge end and counterbalance this with 50 grams increae to the CW, the net increase in effective mass if 5.5 grams. If you add 5 grams at the cartridge end and counterbalance this by moving a counterwe... | |
| How to change effective mass of a SME V. God I hate that I can't edit The bracket is in the wrong place, the equation is M . (Xa^2 - Xb^2) / Xel^2 Mark Kelly | |
| How to change effective mass of a SME V. BTW for a first approximation you can simply assume that the counterweight's contribution will be approximately 10% of the added headshell weight's. If you wish to add say 5 g overall, you would add a headshell weight of about 4.5 g and expect the... | |
| How to change effective mass of a SME V. It's actually very easy.You know the effective mass of the SME V.You know its effective length. Call this Xel.You know the mass of the extra headhsell weight.You can take the counterweight off and weigh it (in grams). Call this M.You can measure t... | |
| Direct drive/rim drive/idler drive vs. belt drive? Lewm The easiest solution I can see to your problem is to have the switch control a relay. If you have lowish DC voltages available (preferably either 5V or 12V) this is easy to do. You'll need some logic to convert the momentary action to a latch... |