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In Reply to: RE: Flattening ... posted by andyr on May 15, 2025 at 00:13:57
As most here must know, there are many vinyl flattening variations on the internet that use two panes of window glass and sunlight , I can't imagine why one would need tempered glass with such moderate temps. but I am hardly an expert, just read a lot.one of the variations that appealed to me was to heat the oven to temp, turn it off, and insert the sandwich, then let everything cool. no chance of thermal damage.
in Van denHuls paper posted on the internet , he mentions using butcher paper between the glass and vinyl. the main thing I got from his paper was his absolute emphasis on reducing moving mass in the cantilever as the primary cartridge design goal. he also suggests automobile valve springs as diy isolation devices for a turntable platform. maybe someone could explain that to me, I would think valve springs are too stiff , but I don't know the frequencies they might effect
certainly if someone asked me to pick between me and Van DenHul for advice, I wouldn't pick me.personally , the only warped record I ever flattened was by accident, " choice cuts" by the pure food and drug act, a pretty good album hippie days album. it was jammed into overly tight storage and ignored for years because of a ski jump warp on the first song. . when I decided to give it a spin, it had been perfectly flattened I knew the storage had grown a little tight over time , but didn't realize it had become industrial strength tight. .
I can see dropping a couple hundred dollars on a gizmo if you have a constant need. I never had enough records pass through my hands where it was even a problem. probably because record stores don't put warped records on the shelves , and I check everything anyway . I also cut open new records right away , so the tight shrink wrap that I prefer to leave on can't distort the surfaces over time.
Edits: 05/15/25Follow Ups:
just returned from googling my suggestions below. most get results without heat, and that worked for me, although unintentionally , because my records were stored so dang tight.
it seems the best was is to skip the heat, hit up a glass shop , and you're set.
I'll do what I can . the Van DenHul paper, the guy behind the grasshopper cartridge and the audio company , might still be online, along with other online methods . but here goes.you get two panes of common window glass, some run masking or other tape around the outside edges to prevent accidentally cutting their hands, place the record between the panes , affix them together, some use tape, wrap it with twine , string, what ever works, most just use a weight, the idea being to have two parallel surfaces to guide the record back to the "Memory" of the original molecular lattice arrangement created in the pressing machine when manufactured. the idea being to avoid melting the original bond organization forming the flat record.
most just set it in the sun to get a gentle warming and watch it so that it doesn't get too hot, and that's it .
I think the heated oven method suggests 160 degrees, but my memory is not perfect on that, you better look it up ( correction, I did look it up and 125 is the temp.. but no heat is more often successfully used) but I do like that the heat load is descending until perfectly cool, for safety., and that you can just let it cool overnight on its ownVan deHul was the only one to suggest adding butcher paper into the sandwich, I think parchment paper with any coating away from the record would be easier to obtain than his suggestion of butcher paper. most methods don't use paper, just glass
As stated, I have never done it myself, but it exploits the same properties intrensic in record vinyl , in the same way, that the electric flatteners do, you just don't have to buy another heat source and controls when you already have the sun or the kitchen oven. plus , unless you break the glass, it will never fail , lasting as long as the records , without question.
I'm going now to google window pane record flattening, just to check my work.
all the best. I had occasion to visit Alaska, mostly back in my sailor days, hauling oil or containers, and always enjoyed it immensely.
Edits: 05/15/25
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