A screw up in using a slitting saw

[TomG]

If you have the cutter in front of the part and feed it in with on he Y axis, you are conventional milling and the cutter will push the part away. If the cutter is behind the part and you feed it with the Y axis, you are climb milling and the cutter will tend to pull the end of the part into it, which is what happened on your second cut. The climb milling thing would be more apparent if your cut was shallower on the X axis.

I use these slitting saws all the time and would highly recommend using ordinary cutting oil over coolant. Coolant will only work on a slitting saw if you flood it. Oil sticks much better and it only takes an instant of no lube for the saw to seize in the cut because there is so little clearance.

Tom