View Full Version : Variable Drive Question
I have a Graham Variable Speed Transmission powered by a 1/8 hp 3450 rpm motor, output speeds infinitely variable 0 to 1100 rpm by means of a small hand crank. I'm going to use it for power feed on a machine I'm building. Can anyone tell me what viscosity and type of oil is used? It is an oil bath mechanism in a closed vented case.
03-29-2001, 02:31 AM
I would be careful about putting gear lubes in it unless you know for sure there are no "yellow metal" parts such as copper, brass, or bronze as the extreme pressure additives attack these metals. A motor oil or a R&O gear & bearing oil would be a safer bet. ATF is another possible canidate for the gearbox.
I have seen some transmissions that use a spinning disk to transfer motion at a right angle to the output shaft using balls on the hardened contact areas and a special traction oil (called "Gold" oil - it is highly toxic).
You could contact Amsoil Synthetic Lubricants Industrial Division at 715-392-7101 or email through their website amsoil.com - they may be able to assist you in finding the proper lubricant.
Sorry I could not help you more...
03-29-2001, 05:26 PM
Thanks for the replies. In the interim I had found my way to Graham and talked to an engineer there who was very helpful. $62. later, I have a quart of Alpha Traction Oil, a lifetime supply, ouch! but worth it - now it works properly.
[This message has been edited by BWB (edited 04-03-2001).]