Would you recommend a Chinese 60K rpm spindle for 20K rpm use?

[JAZZCNC]

I cut phenolic a lot. I would like to see you cutting phenolic at 30k rpm . One can not evacuate chips at that speed and relative to the size of the bit depth and you will glue and break your cutters

I worked on a large industrial machine for furniture manufacturer which only cut Phenolic board and they used left-hand cutters.

[AndyUK]

I worked on a large industrial machine for furniture manufacturer which only cut Phenolic board and they used left-hand cutters.

For the less experienced muppets here (i.e. me), can you explain how a left-handed cutter improves chip evacuation - or have I missed the point and the left-handed cutters were useful in some other aspect?

[JAZZCNC]

For the less experienced muppets here (i.e. me), can you explain how a left-handed cutter improves chip evacuation - or have I missed the point and the left-handed cutters were useful in some other aspect?

In all honesty Andy I've no idea. I just fixed the machine but noted the cutters and infact I've got one somewhere the operator gave me. They only used these cutters for cutting phenolic boards which is tricky to cut at high feeds.