[pwilson101]

Hello,

I'd like some opinions please...

...We have a horizontal machining center with a Mitsubishi Meldas 300 controller and there is a part we are looking at that has a couple tapped holes coming in from the side (so a 90 deg head is needed) AND at a 56 deg angle (when looking at the part from the spindle, starting at 3 o'clock ... this would put the holes in the X+Y+ quadrant). Anyway, we'd have to tap while moving the X-axis and Y-axis simultaneously. I can't use a G84, obviously, because that feeds the machine in the Z-axis. What do you think the chances of success are if programming this point-to-point? Something like this (these are made-up numbers, but you get the drift):

G0G20G90G94S361M3
G54X2.5500Y10.4531B0.000
G43Z-1.5000H1
G1X3.5589Y11.5839F19.0M8 (start feeding into the hole with the tap)
M5 (stop the spindle)
G4P500 (maybe add this dwell to make sure the spindle stopped?)
G1X2.5500Y10.4531F19.0S361M4 (Start the spindle CCW & feed back out)
G0X1.0000Y9.0000
G0G90G53Z0.W0.
(ETC., ETC.)

Thanks for any input...

[txcncman]

As long as you use a floating (spring loaded) tapping attachment it should work.

[pwilson101]

Oh yeah, I meant to say that's what we are using...tension/compression holder. I agree with you ... I was also thinking with that type of holder, why wouldn't it work? When using a G84, the machine is moving point-to-point anyway, right? So if I copy that, but just use the X & Y axes instead of Z, I would think it would be ok. Plus, I can run it outside the part to see if it looks right.

Thanks for the reassurance ... I wanted to make sure I wasn't missing anything ...

[MetalZilla]

As long as you use a floating (spring loaded) tapping attachment it should work.

as usual, stating the obvious.

[txcncman]

Oh yeah, I meant to say that's what we are using...tension/compression holder. I agree with you ... I was also thinking with that type of holder, why wouldn't it work? When using a G84, the machine is moving point-to-point anyway, right? So if I copy that, but just use the X & Y axes instead of Z, I would think it would be ok. Plus, I can run it outside the part to see if it looks right.

Thanks for the reassurance ... I wanted to make sure I wasn't missing anything ...

Modern machines with G84 compensate in the Z axis for spindle deceleration and acceleration.