[captainDL]

I've just started working with a Fadal VMC4020 with the 88HS control. I have a couple questions I would like input on.

First, we would like to set tools using a standard block/gage on the table surface and use the Z-height offset to set the part surface reference. I tried this when setting up the first job without success. The tool either wanted to rapid to the touch off height way below the part surface or when inputting a positive number representing the difference in height from the part surface to the touch off block the Z would over travel. What is the best way to set this machine so that once a tool is touched off we won't need to do it again when switching set ups?

Second, when running parts the machine will run fine for a little while then when a tool change is commanded the spindle will return to the tool change position and appears to want to orientate but doesn't seem to " lock in" to an oriented position. The control gives an error message that axis doesn't communicate with NC. What could be the problem here?

Thanks in advance for your help.

[Techman]

If the z value is greater than 4.0 inches in the fixture offset, then you will need to combine the fixture offset and the tool length offset on the first motion line. I use a tool probe to establish the length of all the tools so that when I set up any job all I have to do is calculate the difference in Z height from the tool probe to the top of the part (Z zero) and put that number in the fixture offset. It would be the same for a tool block on the table. The typical first line of motion for any tool would look something like this:

G0G90 X1.Y0 Z2. E1H1M3
If I split the X,Y move from the Z move and the fixture offset Z value is greater than 4.0 inches then the machine will hit the Z limit on the X,Y move:
G0G90 X1.Y0E1 (CRASH!!!@&*$$)
Z2.H1
Hope this helps.
Jim

[captainDL]

Thank you for the response! I will give that a try.