Glad I was misunderstanding the post, the written word leaves much to be desired sometimes. sorry....
Anyways, my new EXTERIOR belt drive conversion is running with a three phase 1720 rpm motor and a TECO sensorless Vector drive. I have built a two tier pulley setup atop the millhead and on the low speed I can go as slow as 140 rpm with seemingly good torque and as fast as around 1200 rpm. On the High speed pulley position I can go as slow as 1100 rpm and as fast as I have adjusted the vfd so far to show 5800 rpm on my digital tachometer. The machine is very quiet and while I have yet to machine anything with it as the cnc conversion is still undergoing the finishing stages I am hopeful it will be adequate for my needs. The high speed will certainly come in handy for the aluminum and the low speed should be very torquey with the reduction pulleys.
I am not 100% sure about it but I understand the electric brakes available actually work as the last poster described. They have a spring loaded brake of some sort and the power essentially trips a solenoid or something and that disengages the brake allowing movement. The drive should not suffer any faults. I know of two persons using them right now and have no problems with them. I was hoping I did not have to purchase one just because I am forced to be cheap but if I must I will...
You fellows are welcome to check out my threads about my conversion and the belt drive...." Finally getting started" on the benchtop forum and
"Lathemaster RF45 belt drive conversion" on the same benchtop forum...
Peace....  |