On 5/18/2017 11:24 AM, Jim Wilkins wrote:
"Bob Engelhardt" wrote in message
news
On 5/16/2017 3:37 AM, Aussie wrote:
...
The sides of the cut are terrible, not smooth at all.
...

PVC and poor finish says "heat" to me. Try water as a coolant.

The photos appear to show that the bit deflected when the decreasing
rigidity of the parted-off end could no longer force it straight.



Maybe, but in the 2nd picture, the tool appears to be aligned properly.
Too much "in", if anything.

And the twisted off nub looks gummy, as if over heated.

Of all the possible problems, heat is the easiest one to check for: do a
cut while spritzing it with water.