![]() The thickness isn't critical either, but would normally be in the range of 30-50 thou, something like that. You don't need an Akai belt, you only need a simple flat belt of appropriate length. But running that too-tight belt will destroy it. If the machining of the flywheel was done concentric with the flywheel shaft, all that would be needed is a motor speed adjustment. 'Totally ruined the deck'- that may be going a bit far. In this case, too tight will destroy the deck. It's quite possible that when the belt is too tight it will not respond properly to the crowned drive or driven pulleys. If you google "akai CS-F14 manual" you will get a number of free sources for service manual. An O ring might have workedīasically, you have now totally ruined the deck, but it may work well enough for your purpose. If you had cut it down to be narrower, it might have worked. It's perfect for riding up on the drive pulley, but not so good for staying on. The rubber band is the wrong characteristics for that belt, it's probably a bit wrong in width, and too stretchy, plus not straight, wrong length, too thick, etc, etc. Crown might have let the belt run on the wrong diameter, so it couldn't be much. There was no crown on many, but others did have crown on the drive pulley, but, IIRC, with a widish flat area in the middle. V, or really, square, belts had a groove in each pulley. The flat drive belts were often retained by a very tall flange on the drive side. I repaired stereo stuff back when I was in school, earlier than when that thing was new. I've had belts that I made this way last for years. The strip has to be able to lay flat without curving, so that's going to dictate how you cut the strip. You can also use a strip cut from an inner tube, though it may not be a very consistent thickness which would end up giving you noticeable speed fluctuations. Doesn't take much tension to run a cassette tape, especially since the take up, ff and rew are being handled by that other belt. ![]() A fixture made from cardboard will help to align it, and you just sand off any ca that remains on the outside or inside of the loop before using it. What works for me on a flat belt is three tiny drops on the end, not a continuous wetting across the diameter. You should be able to find rubber sheeting- just cut a strip and get the length about right, then ca it together. If you can't find a suitable rubber band, you can always make a belt. It doesn't matter if the flywheel is crowned- some are, some aren't. And yes it should ride well centered on the motor pulley, which is crowned. There might be a hole in the back of the motor where you can insert a tiny screwdriver to make the adjustment. But you should be able to adjust the motor speed. Looks like you turned the capstan flywheel down a bit. Here is some interesting information on the physics of flat belt drives: I don't know if a deeper groove would hold it in place, or if I should instead make a crown? The red rubber band is probably too small but it will stretch to fit: There is a small black rubber belt shown lying on the motor, which connects to the white plastic pulley, and this operates the FFW and REV functions. So I wonder if the same principle would work for this tape drive? This is the way a bandsaw idler pulley is made, and the angle can be adjusted so it will ride on the center. I have known that flat drive pulleys are often crowned, and the belt rides to the high point. So I pulled the pulley out of the mechanism and turned a groove on it which I thought would keep it in place. I tried a different rubber band and the same thing happened. But this rubber band had lost its elasticity and was no longer providing any torque to that portion of the drive.Īfter much difficulty I was able to put a new rubber band in the mechanism, but as soon as I turned it on, it rode off the pulley. I remember having this problem before and I replaced the flat rubber drive belt with a rubber band, and it worked well enough. I have a rather old (1982-1985) Akai CS-F14 cassette tape deck and when I dug it out of my "stuff" to try to transfer from an old cassette to the computer, it did not turn the tape in play mode, but the FFW and REV worked OK.
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