Speed control

[ron grimshawParticipant @rongrimshaw76129]

I would like to fit a speed control to Warco Turrit miii, It has a single phase motor fitted, if this can be done, using what and best to buy and how easy
Do I have to fit 3 phase motor.

[ron grimshawParticipant @rongrimshaw76129]

[John RuddParticipant @johnrudd16576]

I recently completed a 3-phase conversion to my Chester Eagle 30 mill.

I bought a drop in motor rated at 1.1kw ( basically the same rating as the single phase motor) from an Ebay seller for around the £110 mark and a suitable vfd from another seller for less than £80…

Add together the cost of some wiring and switches the whole conversion was done for less than £225…

Without knowing what motor size you have on your mill, I cant advise…

Cheers

John

[Les Jones 1Participant @lesjones1]

Hi Ron,
Single phase motors are not suitable for variable speed operation. You would be better off fitting a three phase motor and inverter. If you search back through the forum I think you will find that this has been discussed before.

Les.

[Kevin BennettParticipant @kevinbennett25223]

hi i use a 12v car window motor and a small clutch with a variable 2 way speed controller works fine on my Chester mill and it is a safe voltage

ty Kevin

[TerrydParticipant @terryd72465]

Posted by Les Jones 1 on 30/12/2012 15:20:10:

Hi Ron,
Single phase motors are not suitable for variable speed operation. You would be better off fitting a three phase motor and inverter. If you search back through the forum I think you will find that this has been discussed before.

Les.

Hi Les,

My Milling machine (equivalent to Warco WM18) and Warco lathe WM280V-F have single phase motors and variable speed. How is this achieved if what you say is correct. I know little about motor control,

Best regards for the New Year,

Terry

[KWILParticipant @kwil]

Kevin

Surely you mean this for the table traverse? Ron needs it for the spindle drive.

[Kevin BennettParticipant @kevinbennett25223]

KWIL yes miss read it as i had a bad day????????

[John RuddParticipant @johnrudd16576]

To the best of my knowledge, the WM18 mill and the WM280V lathe both have DC permanent magnet motors which easily lend themselves to speed control using either MOSFET based or SCR based controllers.

[Les Jones 1Participant @lesjones1]

Hi Terry,
Are you sure that the motors are single phase ? I have only seen either 3 phase or DC motors used for variable speed machines. (Except for electric drill which use series/universal motors but these have vary poor speed regulation.)

Les.

[TerrydParticipant @terryd72465]

Hi Les,

Have just checked the lathe spec and apparently it uses a DC motor which probably explains it,

Regards,

Terry

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