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  1. #1
    I have small CNC lathe which has been retrofitted with a heavier 3ph. motor, due to the the old one being no longer available.
    I have lost the spindle synchronisation in the process. It is running on Mach3. Would anyone know how to go about restoring the facility please. Most grateful for any guidance.

  2. #2
    How does it synchronised? Are you talking for a speed / tacho feature or something more accurate to determine angular location?

  3. #3
    Should have been more clear. The spindle speed encoder is working fine. But for screwcutting the consistent return for each pass is not there. So does not pick up in the same place.

  4. #4
    Quote Originally Posted by Leadhead View Post
    Should have been more clear. The spindle speed encoder is working fine. But for screwcutting the consistent return for each pass is not there. So does not pick up in the same place.
    Sounds like the index pulse is missing or not being read.

  5. #5
    Chaz - Yes the guy who did the motor conversion said it would not be possible with this setup. I wanted to understand if I could retrofit a second encoder to get it to register a repeatable position.

  6. #6
    Quote Originally Posted by Leadhead View Post
    Chaz - Yes the guy who did the motor conversion said it would not be possible with this setup. I wanted to understand if I could retrofit a second encoder to get it to register a repeatable position.
    Probably best to just get a new encoder. Any pics of the setup?

  7. #7
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,104. Received thanks 232 times, giving thanks to others 5 times.
    What controller are you using, as that will dictate what options are available?

    Encoders/slot sensors are normally mounted on the spindle which a motor change shouldn't affect, and Mach must be seeing something if it's attempting a threading move (it should pause until it sees a suitable/stable spindle speed before moving).
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  8. #8
    Guys still trying to get my head around what I have got and what I have not. - Mach diagnostics do not show an active encoder light.
    The speed is apparently being displayed, but checking with optical tacho, 200rpm set and 208rpm actual given on Mach3 screen read out on the tacho at 240. So not too accurate.
    I guess I will buy a new encoder head and make a Mach3 single slot disk to run on the back of the spindle.
    Any suggestions for a UK encoder purchase appreciated.

  9. #9
    Quote Originally Posted by Leadhead View Post
    Guys still trying to get my head around what I have got and what I have not. - Mach diagnostics do not show an active encoder light.
    The speed is apparently being displayed, but checking with optical tacho, 200rpm set and 208rpm actual given on Mach3 screen read out on the tacho at 240. So not too accurate.
    I guess I will buy a new encoder head and make a Mach3 single slot disk to run on the back of the spindle.
    Any suggestions for a UK encoder purchase appreciated.
    There is a guy in Iver Heath that sells good quality encoders for around 40. Search for Hengstler on Ebay, you will find him. I bought my encoder from him for my Harrison M300 CNC lathe.

  10. #10
    Chaz - Thanks. Did you use the rotary encoder?

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