Denford Software & Machines

Hi looking for some help I have a easiturn
Pnc2c and can't get the spindle running
There is 6 cards inside the machine some light up
When I push the motor direction buttons when
I adjust motor speed the chuck moves a small amount
There is a small buzz from the cards and the led's go out?
Anyone got any ideas where I should look for a fault.

Thanks scotty

Can you spin the chuck by hand ?
Was it working recently ?

Yes I can spin the chuck ok belt in good
Condition I have just bought this machine and it was
Running spares or repair, there must be power
Tho every five times of pushing the motor button/stop button
The spindle moves a small bit

Have you checked the motor brushes?

Will check tonight thanks

Well it's a brushless motor i think could not see any brushes
Aesa is the make is this an ac motor?

ok update - no power going to motor but the odd burst for a fraction of a second,
anyway i am going to have to rip this apart anyway to upgrade to mach3 as I am a new to cnc and used it once before with
the wizards.

so what will i need?, am I right in thinking either an inverter which can be controlled through mach if so which one and how much and what do i need to control speed?

or change the motor, sell it and buy a dc one and a sprint motor control card which would be my cheapest/ best route,
also I am thinking of a new power supply which one to suit nema 34 steppers and which driver cards? and spindle mod and breakout board/ limit switchies

am looking for someone who has done these mods and can tell me exactly what i need so i can just buy and fit it if that makes
any sense as i am new to cnc and want to get it up and runnig

Done a bit of wire chasing last night
From the motor back to switch,
Looks like someone has been In
The machine before, there's a transformer
Next to what looks like a reset fuse that has been chopped
And rewired this is connected to the fused motor
Board 240vac input blue/ brown how do I test these points
Without giving myself a nasty jolt.

Thanks scotty

I think a photo will help if you can get one.

jpmiller wrote:...what will I need? Am I right in thinking either an inverter which can be controlled through Mach? If so which one and how much and what do I need to control speed?

Any modern inverter (VFD) suitable for the HP of the motor you have will do. Write down the information from the motor and give Drives Direct in Nottingham a call. You want a standard single phase 230v input three phase 230v output inverter.

Whatever you do, you will need a board that sits between Mach and the VFD. Hence that cost is fixed. Personally, I wouldn't bother with a DC motor.

jpmiller wrote:...I am thinking of a new power supply. Which one to suit nema 34 steppers and which driver cards?

You could re-use the toroidal transformer from the PNC control so long as it suits your drivers. If not, have a look at ArcEuroTrade's site as they have some diagrams of power supplies. Basically, a big toroidal transformer (eg from Airlink), a rectifier (£3 eBay) and a big capacitor (eBay).

jpmiller wrote:spindle mod and breakout board/ limit switches.

Spindle board - diyCNC (Roy) or Peter Homann. Breakout board diyCNC or CNC4PC. Limit switches - already on the machine. Home switches require a simple transistor circuit which is posted elsewhere on this board.

I re-used the 55v psu and fitted Gecko 203v drivers, 2 Homan breakout boards, kept the inductive proximity home switches, (Alan Henderson at Irridian supplied a small board for these), fitted a 2nd parallel port to my PC, and an Emerson VFD, "controlled" by a Homan digispeed. When I can afford a round tuit I shall bin the digispeed and have some preset speeds and a common or garden potentiometer. I also have MPG's on both axes, very handy when prototyping. The air chuck and its associated bits went, this was a "blind" chuck and I have need to get bits through the spindle.
There is a vast amount of information on these Denford forums, seek and ye shall find as someone remarked.

MHJ wrote:...When I can afford a round tuit I shall bin the digispeed and have some preset speeds and a common or garden potentiometer.

I'm curious why you might consider this a more desirable option. Would you care to write a couple of lines on the reason for your choice? If you do wish to dispose of the digispeed, I'd be interested in buying it.