As far as I know, my Mitsubishi M3 controls have no provision for an additional "K" value on the G61.1 line. That might be something specific to the Mazak software. There is nothing in the Mitsubishi manual about it so I've never tried.
The only value I have adjusted is the variable in the machine parameters, base spec, page 4, G1btL. I normally have this set to 100 with good results.
For your pre-finishing pass, you can use the G61.1 to ensure that your tool is getting as much material from the corner as programmed. Another option is to use the automatic corner override G62. This feature identifies inside corners and slows the feedrate on approach to the corner to reduce the loading the tool experiences. It cannot be used simultaneously with G61.1. Cutter comp must be turned on for it to work, but you can put a nominal value in for the tool radius like .0001". When the tool approaches a corner, it drops the feedrate to the %override specified in user parameter, setup, #4, #5, & #6. |