I am in the process of repairing a gramophone (the previous owner was quite a bungler) and I have exactly the same noise. It even drowns out quieter records. How can I get rid of it, or make it a little quieter?
There is no quick fix for motor noise unfortunately. This is the first motor I looked at, and I think I may have bent the governor getting it back together so that is where I will look for the noise first. I also wonder if the weights are unbalanced and I need to change the governor springs. Something else to look out for is worn holes where the spindles are mounted in the casing. I have not done this, but they can be bushed to make them run smooth. Good luck 👍 😀
@@mrrgstuff Firstly, thank you very much for the advice, but after cleaning and checking EVERYTHING, I have realised that it is the centrifugal governor itself. I have replaced the springs, but you can see that the brake disc wobbles a bit when turning because it is not 100% flat. In addition, there is indeed a worn hole in the base plate of the motor where the pin of the rotation axis belongs (probably worn out over time due to the imbalance caused by the uneven disc). I don't think there's anything that can be done. I dare to doubt that bending it around will do any good.
This is a little single spring motor. There were 2,3 and 4 spring motors. As well as having more springs, each individual spring in these bigger motors tended to be more powerful. I think the HMV type 34 motor which had 4 springs could run for that length of time. Of course, these are turning the record at 78rpm, whereas a modern record runs slower, so doesn't need as much power for the same running time. Also, a modern pickup is much lighter than an acoustic soundbox or reproducer, so there is much less friction for the motor to overcome. The longest 78s were the 12" ones and each side is only 6 or so minutes, so the big motors were really designed to play multiple records between windings.
@@mrrgstuff I'm asking because I'm working on a project. I want to create a wind-up modern record player. I'll use 3d printed gears to take the rpm from 78 down to 33. I also intend to use the same spring engine to spin a dynamo which will provide power for a small amplifier circuit. So I'm looking for the right spring motor. I don't fancy having to crank it up after every song, so I want something that'll spin for the entire duration of a single record side.
@voldy3565 I suggest you run the spring motor as slow as you can, probably 60ish RPM and not 78, though maybe lower if you don't mind experimenting with the governor. That way, you will need less gearing down, and the run time will be extended. Just gearing down 78 to 33 will increase the torque more, but that is of no value to you, and you would need a big 4 spring motor to get anywhere near the desired running time. I have tried a 3D printed gear driven turntable but it wasn't a great success: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NxRVPAhMRQI.html You might consider belts instead as they run smoother. Good luck. 👍 😀. I would be interested in seeing how you get on 😀
