Hi all, 

We are experiencing some strange behaviour on our lathe with main and sub spindle.

While programming a part cutoff and transfer to the subspindle we couple the mainspindle to the subspindle.

but after we do this the spindle rpm also gets coupled to the feed override button on the control. So turning the feedrate down to zero also means the spindle completely stops.

This only happens in iso gcode, programming this part in shopturn works as aspected.

This is the code we use to couple the spindles:

COUPDEF(S3,S1,1,1,"NOC","DV");

SPCON(1);

SPCON(3); 

COUPON(S3,S1,0); 

WAITC(S3,"FINE"); 

And this to cancel the coupling:

M1=5

WAITS(3)

COUPOF(S3,S1)

This is according to the manual found at https://support.industry.siemens.com/cs/mdm/25034189?c=18490256395&lc=en-DZ

Are we doing something wrong? Should we use different code to decouple the spindles. Or is this defined in machine settings? In this case i would like to know what settings we need to change.

The machine is a Doosan LYNX2100 SLYB with Siemens 828D v04.08+SP 06+HF03

Kind regards,

Addy

Just a guess, but you might try programming SPCOF(1) and SPCOF(3) to put the spindles back in speed control mode.

Or do you even need to put them in position mode in the first place?

Will try this as soon as i get the chance.

This is the only way i could find to do the part transfer. Most examples use the siemens L600 cycles but they are not installed at this machine.

Do you know another wat of handeling te part transfer? 

Sorry, not familiar with transferring parts between spindles on a lathe.

Not saying don't use SPCON if you need it, just reset to SPCOF after the COUPOF.