lathe problem axis movement in opposite direction

[Sam]

Hi, I have a problem with a Microturn, when I send the machine to home pisition this moves in the opposite direction in both axes, the problem arose due to change PC, as it damages the motherboard of the PC earlier. I installed the software and the surprise is not going home, away from home (goes to the chuck), if I press the home switches, the current position is saved as home but the directions of the axes are inverted. if I press the lefth arrow key the Z-axis moves in the opposite direction marking a negative trend, the same thing happens with X.

A photograph of the machine appears at the address below.

Http://www.denford.ltd.uk/index.php?opt ... &Itemid=29

Its features are:

Model: Microturn
Serial No: 53579
Despatch date :21-Sep-00
Voltage: 110V FLC: 7A 50Hz 1Ph
Control Voltage: 12V
Spindle Motor: 0.5Hp 0.37KW
Electrics Serial No.: OC00222530
Max. RPM: 2800
Nett Weight: 50Kg

Software version: Denford Microturn V2.12 (DOS version)

Early in the program notes:
Denford Fanuc CNC Lathe (MINT) programming (V2.12)

I reviewed the home switches and are in good condition

What could be the cause?
How could I eliminate the mistake?

Regards

[Martin]

The easiest way to sort it out is to swap the polarity on a phase to each of the stepper moters.

If they are wired in colours the Black & Orange will be one side & yellow & red the other.

Therfore change swap the Black & Orange over.

[Sam]

Thanks for the idea but it did not work, I had inverted terminals black and orange in both steppers moters, when I send the machine to home, it arrives at the switch but never released (not save the position of home) and sometimes goes to the chuck. Any other idea?

I think that the problem can be the parameters, I understand that they are on file fanucml.opt, but I don’t know each one of them and if they are correct

AUTOERROR 0
DRAGMARKING 0
DISPLAYSIZE 3
NARROWSIMBOX 0
utils_menu_1 Dos Access
utils_go_1 dos
LOWSPINDLE 100
HIGHSPINDLE 3000
HIGHFEED 500
HIGHFEEDZ 500
SLAVE_XDATUMFEED 400
SLAVE_ZDATUMFEED 400
SLAVE_SPINDLEFACTOR 1.2
SLAVE_ACCEL 160
SLAVE_RAMP 5
machineextentx 127
machineextentz 127
moverangex 127
moverangez 127
chuckcentrex 40
billetz 70
slave_manualfastfeed 500
slave_manualfastfeedz 500
mintool 1
maxtool 16
ATC 0
MINT_MFACT 314.96
SLAVE_MMCONVERT 314.96
METRIC 0

[Martin]

From what you are reporting it now sounds as if you are missing a phase to the stepper motors or the drive card is faulty.

Try measureing the resistance of each pair of windings. Should be around 2 ohms & open between pairs.

[Mr Magoo]

Hi Sam,

I do not know if this is relevant on your machine, but try this in the OPT file

SLAVE_DATUMTYPE 3

For your information,
1 == Negative Datum seek
3 == Positive Datum seek

Are you using the original software disk that came with the machine, or have you downloaded new software?

Cheers
MrMagoo