Vexta 5 phase stepper motor

[RobWilson]

Hi Lads

I am thinking about converting my 626 mill to cnc ,,,,, i have two un-used 5 phase steppers (PK596BW1-H100) and drivers (UDK5114NW2)  ,,, the motors have 100:1 harmonic drives and going off what info i can fined on them looks like they have a max shaft  rpm out put of 35 RPMS

newer model but close ,, step angle on the ones i have is 0.0072 deg
http://catalog.orientalmotor.com/item/stepping-motors--1068/pk-series-5-phase-stepping-motors/pk596be1-h100?&plpver=11&origin=advsrch&by=prod&filter=0&categid=1068&prodid=3001062

Do you think they would be suitable to use for the X,Y axis of the mill with 10 or 16 mm pitch ball screws ?


Thanks Rob

[Hood]

Will be extremely slow even with 16mm pitch, thats a max rapid of only 560mm/min, you would be looking for at least 4 or 5 times that speed.

Also the step count wuld be quite high, not sure if the drives are full/half or capable of microstepping but even at full step that would be 29KHz so if half stepping double that and so on.

Hood

[RobWilson]

Hi Hood

The driver dose have a half step setting ,,,,,,,, suppose i could go for 20mm pitch , that would give 700mm/pm rapid ,,, or use one for the Z axis and by two more for X and Y 



Rob

[Hood]

You would need a kernel of 60khz for that, some computers just wont be happy there so make sure you do a driver test at that frequency before investing money in ballscrews.

Hood

[RobWilson]

Just be in the shop and hooked  up a motor and driver for a test  to  the computer i use to run my Denford mill at 25KHz  set the steps/per to 20000 ,and to my surprise it actually ran , velocity was down to 40 per/min      ,,,,,,,, stuck a taco on the motor shaft got 2800 rpms   ,,,,,,,,,, so that a very poor 28 rpms at the gear box end LOL

I think these motors would probably be better suited to a fourth axis ,,,,,,,,,, back to the drawing board 



Rob   

[RobWilson]

After giving up on the motors i have ,, now on ebay    ,,,,,,,,,,,,, what about this set http://www.zappautomation.co.uk/three-axis-driver-kit-with-stall-detect-p-520.html  ,(anyone interested in a Denford Starmill  lol ),, what would be a good size/pitch of ballscrews to go with 12Nm motor driving the screw direct ?.

Is the some sort of calculation for working out these things ?

Cheers  Rob

[Hood]

What size of mill is it as these are big steppers, I had 916ozin geared 2.5:1 on the Bridgeport and it was plenty, reckon I could probably have gone 1:1 with them.

5mm pitch screws are likely your best choice for a mill.
Hood

[RICH]

Is the some sort of calculation for working out these things ?

Some of the major manufactures have software which will calculate everything that you need and  even give you a list of applicable motors.
Remember that garbage in =garbage out.....
RICH

[RobWilson]

Hi Hood ,,,,,,,,,,,,, the mill is a Chester 626 ,,,,,,I just thought BIGGER would be better    ,,, I was planning on fitting a stepper to  the knee and just locking off the quill .

Cheers Rich ,,,,,,,, i will have a look around the major manufactures sites


Rob