Up With the Slugs and Banana Spiders
January 12th, 2009The Return of 5:30
What a wonderful morning this has been so far. The holidays derailed my schedule; I found myself getting to bed and getting up late. But as of today I am back to my regular routine. I got up at 5:30 and had the world to myself.
I think things reached a crescendo on Saturday. Sunday was coming up, and I was not going to let myself spend that day in the garage, working on my own projects. And I was trying to get the extension for my woodworking megaplex put together. So I kept working, and I got to bed at something like 1 a.m., which is four and a half hours before my preferred rising time. Unacceptable. But that’s all behind me now.
Help me out with VFD questions.
A VFD is a doodad that allows you to run an electrical motor at a speed you like. Readers have been mentioning them. One of the fun applications is running a big, cheap 3-phase motor on single-phase current. You can buy a big ol’ industrial tool cheap and then use it in your garage with single-phase power. Some of these things accept 120 in. You can also get them in 220.
If you stick one of these on a drill press, it can make your life easier. I think. Drill presses with 3-phase motors are not too hard to find. I have read about people using VFDs on their home drill presses.
My questions:
1. Do you lose a lot of power if you slow a 1750-RPM motor down by half, to get a bit speed of around 250 RPM? I don’t know a whole lot about electric motors. I assume there must be some sort of torque band, even if it’s not as peaky as a gasoline engine’s.
2. Do you lose any power running at normal speed? I don’t see why you would. Current is current.
3. Is there something out there that will convert 1-phase 220 to 3-phase 220 without affecting the speed? I might land a nice variable-speed drill press that needs 3-phase but no speed control.
I checked into the place that has the used Powermatics for sale, and their prices are out of control. They want $850 for fairly beat-up machines. I think that’s about twice what a used Powermatic 1150 should cost.
I found a 14″ Walker Turner band saw for sale right here in Miami. Dang it. Too small.