I'm having this Issue that I get less trebels towards the middle.
If I record a track twice on a 12 Inch using makrolon the second one has less trebels.
I have no Idea why....
Does anybody know why this happens?
Cheers
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Aussie0zborn
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yeah thats it.
The high frequencies are getting less and less towards the centre hole.
How the fuc.. is that possible?
I also cannot get rid of the bloody Background noise.
I have stylus heating and i tried heating up the disc as well.
I always have the same amount of noise.
New diamond and cutting on lexan & makrolon.
cheers
The high frequencies are getting less and less towards the centre hole.
How the fuc.. is that possible?
I also cannot get rid of the bloody Background noise.
I have stylus heating and i tried heating up the disc as well.
I always have the same amount of noise.
New diamond and cutting on lexan & makrolon.
cheers
-
Aussie0zborn
- Posts: 1827
- Joined: Sat Mar 11, 2006 8:23 am
- Location: Australia
- Contact:
This is a natural phenomenon that has to do with the reduced velocity as the cutting diameter decreases. You will find the detailed info somewhere here on the forum. As you get closer to the label area of the disc you are packing more information in to less space with each revolution than you did in the previous revolution and certainly more than you did in the first revolution of the disc. This is very normal but I am surprised it would be so noticeable. I have never cut on anything other then lacquer so I don't know about cutting on other materials like a lot of people here do.
You should buy the books "Disk Recording Vol 1 and Vol 2" from the Audio Engineering Society, New York, USA. All this sort of stuff is explained in detail.
You should buy the books "Disk Recording Vol 1 and Vol 2" from the Audio Engineering Society, New York, USA. All this sort of stuff is explained in detail.
ok that's good to know I gonna have a look.
the thing is it is very noticeable.
If I cut the same track twice the second one has a lot less trebels.
Do you reckon it could also have something to do with the groove depth?
I mean it cannot be normal that it is so noticable. If I listen to a dance record I cannot really hear less trebels at the end and they cut often one track per side. My track is just half way of a 12"
strange.hmm
the thing is it is very noticeable.
If I cut the same track twice the second one has a lot less trebels.
Do you reckon it could also have something to do with the groove depth?
I mean it cannot be normal that it is so noticable. If I listen to a dance record I cannot really hear less trebels at the end and they cut often one track per side. My track is just half way of a 12"
strange.hmm
how many lpi are you running? when i'm cutting 12" dance music (drum n bass or dubstep) on poly, i ALWAYS cut it at 45 using either 120 or 192 lpi and i hardly notice any sort of treble loss. as far as background noise, there's always some but shouldn't be terribly noticeable.
i've cut some punk stuff on poly on 7"s at 240 lpi and can't really tell the difference either.
that's really strange.
i'll upload some polycuts i've done so you guys can hear it
i've cut some punk stuff on poly on 7"s at 240 lpi and can't really tell the difference either.
that's really strange.
i'll upload some polycuts i've done so you guys can hear it
all the best!
- tommie 'plan 9' emmi
poly-cut lathe cuts / cymbalism recordings
- tommie 'plan 9' emmi
poly-cut lathe cuts / cymbalism recordings
Ok I uploaded something i recorded.
The first bit is on the outer side and the second bit is as close as possible to the centre hole.
In 45 rpm
http://www.sendspace.com/file/2wcj5h
cheers
The first bit is on the outer side and the second bit is as close as possible to the centre hole.
In 45 rpm
http://www.sendspace.com/file/2wcj5h
cheers
Closer to the middle the cutting speed is lower than that at the outer area. Through this the friction between the stylus and the cut material is inconstant; this friction leads to a self-generated heating. Besides the mentioned problem of decreased length-per-time of the groove as it progresses towards the inner area, the decreasing self-generated heat at the cutting edges might make the cut material respond varied to the cutting: The surface might get more rough and a more elastic respond to the modulation will lead to loss in the high frequency range first.
Experiment with different heating settings and maybe a variable heating corresponding to the actual position of the cutter head might diminish the mentioned effects.
Experiment with different heating settings and maybe a variable heating corresponding to the actual position of the cutter head might diminish the mentioned effects.