I'll give you a qualified MAYBE. Let's say it currently has a 5K ohm pot, going to a 10K won't hurt it. Maybe it's worth a try. The problem may be that the analog signal from the pot is converted to digital in the controller, so once the voltage reaches a certain low point, the digital output the the BLDC controller just won't go below it's programmed low set point. In that case all that putting in a 10K pot would do is limit the range of the pot. I'm not sure if it's possible to do what you want without going into the firmware and reprogramming it.Thanks guys. I don't know anything about controls but I wonder if you could just put a different speed pot on it.
I didn't know it does not have an external pot. In that case, you are changing a counter in the controller with the keypad, thus the entire system is digital. In that case, the only option would be to make firmware changes. I have seen analog control of BLDC motors, but it is always converted to digital in the controller through an A/D converter.Jim,
I asked Chris, the owner of LMS, about slowing it down and he said he didn't know how to do it and had not heard of it being done.
Are you guys talking about changing an internal speed pot? The 8.5x20 doesn't have an external pot for controlling speed. It uses membrane buttons to change speed in 10rpm increments. As for 1 rpm, I'm sure you know that could present a motor cooling problem. I have wondered if that's why the minimum from the factory is 100 rpm, for prolonged threading sessions, but haven't found an answer.
You could possibly cobble up a 'translation circuit' between the hall-effect's feedback and the controller, but this could likely cause more trouble than it's worth.I thought about that, too, Jim, but I'm afraid of releasing the magic smoke from the electronics and/or the motor. I'm a EE, but on the power side of the equation. They have written text books about what I don't know about electronics. I know that for a fact because I used some of them for door stops in college.
MAE, spindle runout on mine is .0006" in the center bore and .0005" on the register.Tom, how accurate is the machine? Do you know the spindle runout?
Bill, not sure about a backgear. But, did you check out the link I posted in message #2 above? That mod was done on a smaller machine than we're talking about, but offhand I don't see why it couldn't be done with a 8.5x20. I was impressed when I saw it.What about making a back-gear for it? Don't know if it's even feasible, just throwing it out there.
Yea, remember reading that one. I was considering it, but my lathe will get down to 50 so figured it wouldn't benefit me that much. Nice project though. Maybe you should consider it? As long as you are just slowing the spindle down, you won't affect your spindle to leadscrew ratios for threading. Sounds like a nice project. I'll watch!Bill, not sure about a backgear. But, did you check out the link I posted in message #2 above? That mod was done on a smaller machine than we're talking about, but offhand I don't see why it couldn't be done with a 8.5x20. I was impressed when I saw it.