Spindle Encoder-no speed control

[Cayenne]

Is it necessary to have a stepper or servo spindle motor in order to use a spindle encoder? Would an ac motor (no speed control) work with an encoder?

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[Jim Dawson]

Yes, all you are doing is reading the encoder position. It doesn't matter what is driving it.

What is the intended use of the encoder signals?

[Cayenne]

I want to be able to cut threads (lathe, x and z are on steppers) I thought encoders were strictly for positional feedback am i missing something else? Thank you.

[Jim Dawson]

I want to be able to cut threads (lathe, x and z are on steppers) I thought encoders were strictly for positional feedback am i missing something else? Thank you.

Sorry, my answer wasn't clear. It will absolutely work just fine. I did this very thing on my CNC lathe, standard AC motor. The speed control makes no difference. You will be electronically gearing the Z axis to the spindle encoder, and using the encoder index pulse for positional data to start the thread.

I used this for both rigid tapping and single point threading.

[servtech]

I want to be able to cut threads (lathe, x and z are on steppers) I thought encoders were strictly for positional feedback am i missing something else? Thank you.

Encoders give the speed feedback to the controller, a motor tacho controls speed, not a stepper motor that doesn't usually have one.

To thread electronically you need to use a marker pulse on the encoder to couple the motor angle position to the leadscrew. Center lathes use a dial and lever, I don't think a stepper motor can be coupled electronically for threading.

[mactec54]

Encoders give the speed feedback to the controller, a motor tacho controls speed, not a stepper motor that doesn't usually have one.

To thread electronically you need to use a marker pulse on the encoder to couple the motor angle position to the leadscrew. Center lathes use a dial and lever, I don't think a stepper motor can be coupled electronically for threading.

It's called an Index Pulse or Z-Pulse on an Encoder, A stepper motor can be used, the control determines how the Spindle and Axis is electronically Geared together, so it does not matter what kind of motor is being used

[mactec54]

I want to be able to cut threads (lathe, x and z are on steppers) I thought encoders were strictly for positional feedback am i missing something else? Thank you.

Your control has to have this feature to do threading, so what is your machine control you are using.

[Al_The_Man]

The type of controller makes a lot of difference, whether it is only capable of using the marker pulse alone, or using the marker for sync'ing and from then on using the actual pulses for electronic gearing.