Making a lathe inconsistent speed?
I have a bench lathe where the speed is familiar by moving belts on different sized pulleys. As this requires stopping the lathe and opening the access panel, I would like to be capable of change the speed on the fly. I have see variable speed control boxes that you plug a tool into then dial the speed up and down. They adjectives state that they are not for use with slow start motors. How do I know if the motor I have is slow start? Does anyone hold any other suggestions?
Answers:
It sounds to me that it is a slow-start motor. Merely because it is belt driven. However, you would know best! Does it start slow. That is really what a slow-start motor is. Does it take a a moment or two bit to achieve its full speed/rotation? Or, does it go to an instant on? My lathe is sudden start, but when I was a kid, we had a slow-start. You can use a undependable speed control box with it even if it is a slow-start, but you will wear out the motor (brushes) fairly soon. Why, you ask? The motor is not designed to run at a variable speeds and what you would be doing is slowing it down - in turn cause the motor (brushes) to overheat. Belt drives run at one speed and the various belts determine the speed - as you already know! However, quick start motors are made to run hot and it would smaller quantity of a strain on the motor. Lathes can be fairly cheap to purchase these days and they will ending as long as the way you use it. Check on the web and find wharehouse tool distributors. I bought one 2 years ago for $90 and it still works only just fine! If you decide to use a variable speed control box, be concerned of overheating or a fire.
Good Luck to you!
My suggestion is you could use a frequency inverter.this changes the speed of your A.C.motor by controlling the hertz.normal American power is 60 Hz.and can be taken up to 180Hz.or down to10Hz. depending on motor nouns.This is not a difficult install but could be expensive..This will work with slow start motors as you may change the ramp up or ramp down speed to collect your needs
Since your MOTOR isn't gear drive, but belt drive, it seems to me it was manufactured at its extreme level of strength, to support the various alterations via the belts. I enjoy to assume it's an older model.
I'm not an electrician but I've used many lathes, commonly.
I suspect that a "Rheostat" would only put more strain on a motor not designed in that technology. I'll also assume that most or adjectives lathes aren't instantly at 25,000 plus RPM's, as Routers aren't strictly either. To recreate a slow start motor is better left to those more qualified, or who figure out the design and dynamics of the motor.
Steven Wolf
(The Rev.) Source(s): 40 plus years as a contractor
first off, dont stick a fluffy dimmer on there....seen that one to lots times...
you can control the speed of an AC motor but its not good for it and DC motor controls are much more precice.
you should upgrade the lathe or just stick near the belt changes.
yea its not fun as its how my drill press is set up but it works... Source(s): electrician
Without getting into the electronics, most lathes with fluctuating speed are DC voltage motors and use a rheostat to control the speed of the lathe. You have to use a transformer to change AC voltage to DC voltage and use a motor life-size enough to do what your lathe is designed to do. It can be expensive.
I don't relatively agree that using a variable control alone heats up the brushes and the motor. What is occurring is that AC speed controls work on the principle of chopping part of the AC's sine wave stale. As a result, the motor slows down but also and more importantly, loses mechanical power. You, using your cutting tools on the work piece, motivation a mechanical strain on the motor which "he" can no longer deliver, and therefore heat up.
Any solution that really works, be it electronically or a mechanical gear box, is likely so expensive that you a bit continue to swap your belt positions.
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Answers:
It sounds to me that it is a slow-start motor. Merely because it is belt driven. However, you would know best! Does it start slow. That is really what a slow-start motor is. Does it take a a moment or two bit to achieve its full speed/rotation? Or, does it go to an instant on? My lathe is sudden start, but when I was a kid, we had a slow-start. You can use a undependable speed control box with it even if it is a slow-start, but you will wear out the motor (brushes) fairly soon. Why, you ask? The motor is not designed to run at a variable speeds and what you would be doing is slowing it down - in turn cause the motor (brushes) to overheat. Belt drives run at one speed and the various belts determine the speed - as you already know! However, quick start motors are made to run hot and it would smaller quantity of a strain on the motor. Lathes can be fairly cheap to purchase these days and they will ending as long as the way you use it. Check on the web and find wharehouse tool distributors. I bought one 2 years ago for $90 and it still works only just fine! If you decide to use a variable speed control box, be concerned of overheating or a fire.
Good Luck to you!
My suggestion is you could use a frequency inverter.this changes the speed of your A.C.motor by controlling the hertz.normal American power is 60 Hz.and can be taken up to 180Hz.or down to10Hz. depending on motor nouns.This is not a difficult install but could be expensive..This will work with slow start motors as you may change the ramp up or ramp down speed to collect your needs
Since your MOTOR isn't gear drive, but belt drive, it seems to me it was manufactured at its extreme level of strength, to support the various alterations via the belts. I enjoy to assume it's an older model.
I'm not an electrician but I've used many lathes, commonly.
I suspect that a "Rheostat" would only put more strain on a motor not designed in that technology. I'll also assume that most or adjectives lathes aren't instantly at 25,000 plus RPM's, as Routers aren't strictly either. To recreate a slow start motor is better left to those more qualified, or who figure out the design and dynamics of the motor.
Steven Wolf
(The Rev.) Source(s): 40 plus years as a contractor
first off, dont stick a fluffy dimmer on there....seen that one to lots times...
you can control the speed of an AC motor but its not good for it and DC motor controls are much more precice.
you should upgrade the lathe or just stick near the belt changes.
yea its not fun as its how my drill press is set up but it works... Source(s): electrician
Without getting into the electronics, most lathes with fluctuating speed are DC voltage motors and use a rheostat to control the speed of the lathe. You have to use a transformer to change AC voltage to DC voltage and use a motor life-size enough to do what your lathe is designed to do. It can be expensive.
I don't relatively agree that using a variable control alone heats up the brushes and the motor. What is occurring is that AC speed controls work on the principle of chopping part of the AC's sine wave stale. As a result, the motor slows down but also and more importantly, loses mechanical power. You, using your cutting tools on the work piece, motivation a mechanical strain on the motor which "he" can no longer deliver, and therefore heat up.
Any solution that really works, be it electronically or a mechanical gear box, is likely so expensive that you a bit continue to swap your belt positions.
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