Spindle Gage Line Question

[robk]

Does a Big Plus Spindle gage line differ from a standard CAT50?

If so does that mean that a calibrated gage bar for a standard 50 taper spindle will have 2 different tool length offsets between machines with a Big Plus and standard spindles?

[jeff]

From MMS online:

The only measurable difference when standard V-taper tools are used is that the gap between a standard V-taper tool flange and the new spindle is 1.5mm instead of 3mm. Gage line for the tools is not affected.

 

Linky

[MMT-USA]

Matsuura spindle gage line for a 40 Taper spindle face is .97~.98mm

[Rick Henrickson The Boeing Co.]

I would think the gauge line would be diffrent big plus is a double face contact I would think you could check this with an indicator, measure your tool, put it in the spindle, MDI to a specific z height off the table with length comp active and measure it from the table and see if it is correct and if not you will see the diffrence and can adjust for that.

[Rick Henrickson The Boeing Co.]

oh and isnt a big plus actually a BT and not a CAT

[MMT-USA]

Big Plus is the specification of the taper only. This is available in both CAT and BT

[Rick Henrickson The Boeing Co.]

good to know I thought it was just BT, Thanks for the info

[robk]

Thanks for the input guys.

We tried to use the same tool in the machine with the Big Plus spindle and the length was about .017" different.

 

We checked appropriate parameters. We checked the laser alignment as well as the pivot point calibration programs. All came out really good.

 

I was told by the service rep for the machine manufacturer that they are different.

I just wanted to hear what others had to say.

[Guest CNC Apps Guy 1]

The Spindle does not dictate if it is BT or CT, the Tool Changer Claw and the Tool Magazine (if Rack Style)do.

 

BTW, gage line is not necessarrily the face of the spindle. It's just a convenient location to get a positive tool length from.