Yoocnc / 3040z Kernal Speed

I recently got my 3040z machine home and have been really enjoying it so far. The particular machine I purchased claims to be able to achieve 4000mm/min (~155 IPM) rapids and cutting speeds as high as 2500mm/min (~98 IPM). After getting the machine running I quickly learned that with 640 or so steps per revolution on the motors this limits the max speeds to 2000mm/min, according to Mach3. The instructions in instructions say your need to set your kernal speed 25,000hz but that means no mater what I am limited to around 2000mm/min.

Has anyone experimented with faster speeds or achieved the advertised speeds?

This is the yoocnc controller I have:

4Axis breakout board -450JKB (New driver Board for 6040Z+S80) - carving-cnc.com

450jkb.jpg

Attached Images

• 450jkb.jpg‎ (101.5 KB)