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Audio cassette pinch roller - 11mm

I'm trying to recondition an Akai GXC760D Hifi cassette deck (late 70's vintage I believe.)

This is a twin capstan (both engaged at once) design that uses

11.0mm diameter pinch rollers. The diameter is quite critical as there is only just enough travel on the carriage, the clearances are tight, and I think the nature of a twin capstan design makes pinch roller pressure fairly critical. The common replacement sizes (9.6mm and 13.0mm) do not fit. I think an acceptable range would probably be 10.5-11.5mm.

The height is 7.9mm and hole diameter 2.5mm, though these are somewhat negotiable.

I've looked through a variety of usual UK parts sources (RS CPC/Farnell Grandata CharlesHyde Seme etc) and I get the feeling nobody stocks other than the two 'standard' sizes.

Anyone know of somewhere that stocks 11.0mm? Anywhere in the world (though UK would be ideal.)

Alternatively, has anyone successfully machined down a larger size (e.g. 13mm) on a lathe? My gut feeling is that rubber is unlikely to machine down smoothly, though I've not tried. Or maybe, if a VCR pinch roller of the right diameter existed (is there a table of VCR model to diameter anywhere??) then as these seem readily available, could one be cut down in length?

Thanks for your help! Mike.

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Go to a small industrial rubber products supplier and ask about rubber cordage, no not S&M. Local to me

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all 3 Technix, Martins and Portmere are perfectly happy for small sales enquiries. Preferably go in when its quiet and stock up with a range of "O" rings and they may give you a sample length of cordage, otherwise about 2GBP per metre. Preferably with a lathe , for centering , drill hole through pieces of the right length, cut with a sharp knife. One should be good enough

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

On Mon, 22 Jan 2007 20:14:01 +0000, Remove _ for valid address Has Frothed:

Many years ago if I recall I resized a pinch roller for something using an emory board and a Dremel tool. I guess if you're in a "pinch" (pun intended) the closest port in a storm will often do.

--
Pierre Salinger Memorial Hook, Line & Sinker, June 2004

COOSN-266-06-25794
Reply to
Meat Plow

You could try a razor blade as a cutting tool and very fine cuts.

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Reply to
Homer J Simpson

u snipped-for-privacy@csi.com (Remove _ for valid address) wrote in news:slrnera6o9.6j.u snipped-for-privacy@csi.com:

The way to reduce the diameter of a rubber cylinder is to chuck in in a lathe or electric drill, start it turning and bring a block with sandpaper up to it. You abrade the rubber away, the same way you file your fingernails.

Reply to
Jim Land

I've sometimes found that with oddball sizes, they are more a function of the hub diameter, so if you can get a replacement 9.6mm roller of the correct width, removing its tyre, and refitting this to the original hub, will get you a 'new' pinch roller of the correct diameter. The rubber is quite flexible, and will normally stretch over a slightly larger hub without too much trouble, helped if necessary, by a little washing up liquid. I've also performed the same trick where the hub is the same size, by cutting a short length of heatshrink tubing to fit over the centre part of the hub. When that is then shrunk on, it will boost the diameter of the hub by up to a mm, which will do the same to the outer diameter of the tyre when it is fitted over it. When refitting the tyre, make sure that it has gone into the hub recess squarely all round. This technique only works of course, for pinch rollers with a central plastic hub, not those with a moulded-in brass bush. Bit of a bodge I suppose, but it does work, and is a lot less trouble than filing and lathing and so on.

Arfa

Reply to
Arfa Daily

Its poss to fit a rubber sleeve on a smaller wheel, if that would otherwise fit.

NT

Reply to
meow2222

Just wondering how putting some shrink wrap on the smaller replacement would go to build up the diam - slip?

David

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Reply to
quietguy

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