Defect in groove. Anybody else seen this?
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- concretecowboy71
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Defect in groove. Anybody else seen this?
I have seen this defect twice in the last couple of months and was wondering if anybody else had ever seen anything like it. It looks like a small groove exiting the side of the main groove, like a branch on a tree.
I think he playback stylus catches this and skips over to the next groove.
Here is a shot I took on my phone:
http://www.flickr.com/photos/cowboy71/5507564932/
Thanks for the input, scratching my head as to what might cause this.
I think he playback stylus catches this and skips over to the next groove.
Here is a shot I took on my phone:
http://www.flickr.com/photos/cowboy71/5507564932/
Thanks for the input, scratching my head as to what might cause this.
Cutting Masters in Bristol,Virginia, USA
Well Made Music / Gotta Groove Records
Well Made Music / Gotta Groove Records
- concretecowboy71
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I did not think of the chip nozzle. I will keep an eye out for that. Right now, it is pretty high up off the plate, but that does not mean that has always been.
I thought of the scratch thing also, but this has happened twice and both times the extra groove originates and branches directly off the main groove. It would seem that a scratch might go all the way through the groove to the other side.
Thanks for the input!
I thought of the scratch thing also, but this has happened twice and both times the extra groove originates and branches directly off the main groove. It would seem that a scratch might go all the way through the groove to the other side.
Thanks for the input!
Cutting Masters in Bristol,Virginia, USA
Well Made Music / Gotta Groove Records
Well Made Music / Gotta Groove Records
You should check the feedscrew, I had an issue awhile back on the last part of some records I made that I noticed immediately that the groove was becoming shallow only on a couple revolutions, there was some chip that had somehow wrapped around the screw which was causing liftage. Maybe your screw has something on it causing it to jump like that.
Just another thought.
Just another thought.
all the best!
- tommie 'plan 9' emmi
poly-cut lathe cuts / cymbalism recordings
- tommie 'plan 9' emmi
poly-cut lathe cuts / cymbalism recordings
- dietrich10
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I use one of the paper circles that come in a box of lacquers. The suction works through the paper. I use it to cut two sided dubs. Works a treat for me.
Cutting, Inventing & Innovating
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Groove Graphics, VMS Halfnuts, MIDI Automation, Professional Stereo Feedback Cutterheads, and Pesto 1-D Cutterhead Clones
Cutterhead Repair: Recoiling, Cleaning, Cloning of Screws, Dampers & More
http://mantra.audio
I've been playing with this anti-static "slipmat" that has a built in 3 speed strobo in the center I got from amazon.. Reduces static charge on the plates, but seems like air would pass through it, and its soft and fussy.. so it doesn't mar the lacquers.. I just pop'd a hole 1" from the center to allow the "dub pin" on the presto to come through and lock the overhead, but you guys dont have those..
- concretecowboy71
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I have been using the material that one uses in silk screening. It is soft enough where it does not scratch the lacquer but allows air to pass through for the suction to work. Has worked like a dream.
This shot is from a test pressing so this defect was in a master lacquer. It was brand new, although I cannot tell you if this was the first or second side I used.
I wish I could find the picture I took of this same defect the first time I saw it on another lacquer. It looks identical, that is why the scuff/scratch theory seems harder to go with. Plus, the first time, the extra groove perfectly bridged between two adjacent grooves without overshooting either groove. If I find the picture I will post it also.
This shot is from a test pressing so this defect was in a master lacquer. It was brand new, although I cannot tell you if this was the first or second side I used.
I wish I could find the picture I took of this same defect the first time I saw it on another lacquer. It looks identical, that is why the scuff/scratch theory seems harder to go with. Plus, the first time, the extra groove perfectly bridged between two adjacent grooves without overshooting either groove. If I find the picture I will post it also.
Cutting Masters in Bristol,Virginia, USA
Well Made Music / Gotta Groove Records
Well Made Music / Gotta Groove Records
- concretecowboy71
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Here is a picture I took in January of the same defect on another record. This one is in the lead-in groove of a 12". The first picture was on a 7".
These are very similar and could not be in the same spot on the lacquer because of the size difference in the lacquers.
Anyway, just more food for thought.
http://www.flickr.com/photos/cowboy71/5509405850/
These are very similar and could not be in the same spot on the lacquer because of the size difference in the lacquers.
Anyway, just more food for thought.
http://www.flickr.com/photos/cowboy71/5509405850/
Cutting Masters in Bristol,Virginia, USA
Well Made Music / Gotta Groove Records
Well Made Music / Gotta Groove Records
- dietrich10
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- dietrich10
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- concretecowboy71
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Hi Concrete,
Yes, that looks like a momentary chip drop. If you notice the angle of the mark matches the angle the chip travels from stylus to suction tube.
A few things that can cause this:
1. Suction strength weak.
(Chip jar getting full, or suction tube gets blocked intermittently)
2. new/wet/soft batch of lacquers.
3. Suction tube not close enough.
4. Impurities in the lacquer
That's all I can think of for now. Let us know what you find.
Hope this helps some.
JJG
Yes, that looks like a momentary chip drop. If you notice the angle of the mark matches the angle the chip travels from stylus to suction tube.
A few things that can cause this:
1. Suction strength weak.
(Chip jar getting full, or suction tube gets blocked intermittently)
2. new/wet/soft batch of lacquers.
3. Suction tube not close enough.
4. Impurities in the lacquer
That's all I can think of for now. Let us know what you find.
Hope this helps some.
JJG
- monkey1553
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