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

[Boyan Silyavski]

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 cut phenolic at wood RPM and 1/3 the feed for wood, for perfect finish , especially when going deep. Now i can much speed that up HSM and blowing air in the cut, but the only reason i see doing that is serious production. Otherwise one will have to stay there and be like vigilante so the bit does not break. I prefer drinking beer while my robot does the job.

Like Dean said 2kw spindle will do that perfectly. You should worry finding and paying for ultrasharp bits in that size. Cause chinese will not do. I use Kyocera.

[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.