![]() ![]() Most of the spindles you encounter on Ebay are 2pole (same as 1 pole pair per phase) and at 400Hz input synchronous speed This means to get useful lowspeed torque you need a big spindle motor. To cut steel in LIGHT cuts with a 6mm tool at 3000rpm then you will need about 1Nm minimum. All of the high speed spindles suffer this problem.īest approach is to determine the torque required to do the machining you want and work backwards. Scarcely enuf to spin a 3mm tool when cutting steel. At 6000 rpm it still only produces 0.3Nm torque I have a German made 750W 24000 rpm unit which produces 0.3Nm of torque. They too suffer from low torque and while they run at low speed often with That's the combination I use and it works well. Some cases its necessary to provide a separate fan. One problem to be aware of that the fan will also be slower than normal and the motor will run hot. ![]() On the Kress there should be a makers plate and that could be used to make some pretty fair calculations as to how it might Low speeds the spindle will have very low power and will be very easily stalled. Just reducing the speed does not increase the torque so at Whether you buy one or build one you may be disappointed tho. I made oneĪ while back for a customer who had an old (very old) school pin welder. I'm not familiar with any particular commercial off the shelf product that would do the job. They are as robust as each SCR even a $10 SCR can handleĢ0A or more. Inductance is to high they don't switch off to well.įor highly inductive loads anti-parallel SCRs are the way to go. Triacs are not the best choice for inductive loads, if the Most light dimmers have a knob of the front as well but that knobĬould be replaced, conceptually at least with a control voltage. Old school way of doing things but simple and reliable.Īnother way is triac control, a bit like a light dimmer. ![]() Downside is it has a knob on the front not electronicĬontrol. One way to do it is with an autotransformer widely called a variac. Ie 50 or 60 Hz depending on where in the world you are. You can control the speed of a universal motor by changing the input voltage but the input frequency stays the same, ![]()
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