Programming secondary spindle for MAZAK quickturn

[Ben.KimKRXLX]

New programmer here, setting up shop with a Mazak QT250MSY lathe.  

We downloaded the post for this machine, and have cut a few test parts.

Now we would like to use the second spindle to pull the stock forward after parting.

However, we cannot get the secondary spindle to chuck.

Turret moves out of the way (good), machine reaches M540 (transfer mode on)

but then we get an error for "illegal format". The secondary spindle doesn't move.

The code shows a rapid B axis and a formula in brackets.

We have tried leaving the formula alone, and also entering values to try to get the spindle to move at all.

Nothing.

Post has "gotSecondaryspindle=true".  

Any help would be apprecitated; i've included a screenshot, the program, and the QT250MSY post from autodesk.

[andrew.millardCYPQ9 · Accepted solution]

Hi,

This will almost certainly be a post issue, but before getting the post updated, I was wondering if you had tried removing the '+' from the following line :-

M540 (TRANSFER MODE ON)
G0 B[20.435-0.2325] (MOVE HD2 TO APPROACH)
G1 B[20.435-0.7325] F40.
M307 (CLAMP SUB CHUCK)

The # vars in the formula will work fine, but I suspect the '+-' will be confusing the controller.

If you could verify that this works, we can look to update the post accordingly.

Regards,

Andy

[Ben.KimKRXLX]

Thank you for the reply. Completely missed the "+-".

Once we can access the machines (occupied until off-shift times) we will try this again. 

We will try the formula (no "+-") and entering a raw number. 

[Ben.KimKRXLX]

Thank you Andrew, the +- was the problem. Also the #501 variable (distance: stock to sub jaw) needed to be made negative.  No big deal to do manually in the code for our purposes.

[billcainautodesk]

The #501 should be able to be entered as a negative in Fusion.

The +/- problem should be fixed in the next update. It's in for quality checks now.