...errr, I have no idea how that became an empty post.

Anyways, my question was more or less as follows. On a turntable, does the vinyl play at exactly the same speed from outside to inside (and when I say speed, I mean bpm, not rotational physics).

Thanks

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bpm stays the same, it is probably done in the cutting process

It doesn't stay exactly the same, there is a samll difference between beginning and end of all vinyl, but the difference is so neglible, so minute it does not matter. Some are so poorly cut that a definite difference can be detected (Midtone - Pearl anyone?).

the only way the bpm will be noticably different is if the vinyl gets warped...but even then it has to be reaaaally warped

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well, correct me if im wrong, but if a vinyl is actully "cut" in..."real-time", then the rotation of the vinyl during cutting would not matter, as long as the rotation stays the same....in turn, the only effect would be that the grooves toward the end of the record would just be "bunched" together

and if the record is pressed, then the "bunched" effect is just duplicated during the pressing

again....emphasis on the "correst me if im wrong" part. this is merely a fairly educated guess

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huh?

quote:

Originally posted by Acid John well, correct me if im wrong, but if a vinyl is actully "cut" in..."real-time", then the rotation of the vinyl during cutting would not matter, as long as the rotation stays the same....in turn, the only effect would be that the grooves toward the end of the record would just be "bunched" together and if the record is pressed, then the "bunched" effect is just duplicated during the pressing again....emphasis on the "correst me if im wrong" part. this is merely a fairly educated guess

That is basically how it works

There is one other theoretical thing that might influence the bpm though... On the outside the record spins faster than on the inside... So on the outside there's more friction than on the inside... But then again... that's also the case when cutting...

quote:

Originally posted by Acid Circus It doesn't stay exactly the same, there is a samll difference between beginning and end of all vinyl, but the difference is so neglible, so minute it does not matter. Some are so poorly cut that a definite difference can be detected (Midtone - Pearl anyone?).

ah!!! don't tell me!
And I was wondering why I can never do a proper beatmatching with that record! never thought it was a general problem

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