questions on rapids and the trajectory planer

i'm about to convert a knee mill to cnc and i am examining the option of driving the knee instead of the column for more travel. if i do this it would be supported/counterweighted with regulated air pressure and air pistons so there is minimal added mass. but there will still be a speed limit lower than the other axises. i want to know the behavior of the rapid moves. if one axis is slower will the trajectory planner try to make linear moves and limit the faster axis as would happen in g1 mode? or will each axis move at it's speed limit until the commanded position in each plane is reached? if you command a move on x and y in g0 of equal distances so it travels at 45 degrees will the total linear speed be at the set rapid speed? or will each axis reach max rapid so the measured speed would be 1.414x the set rapid speed? i know how it will behave in g1 but i'm wondering about g0.

i have run hass lathes that don't maintain full coordination between axises at 100% rapid so an x,z g0 move would sometimes make curved moves rather than angular and a move with more travel in one axis at a low rapid would move 45deg till one axis reached it's target then continue to the other target along the axis with the longer move. the machine would run each axis at it's speed and acceleration limits so moves were not direct. this is what i would prefer so the machine is not limited to the z speed limits for x/y moves.

well the knee may be difficult to move more than 50 ipm. that may be fine to get to a clearance position but i'd like the xy plane to move a bit faster and if i need tool changes there could be coordinated xyz rapid moves with a lot of z travel.

ok now that most of what i was wondering was answered, is there a way to set separate maximum speeds for different axises? or is there just one setting for the rapid speed? can i have 50ipm rapids on the z and 100+ ipm on the xy plane?

maybe 50 ipm sounds fine for a knee mill but if i can get more i'd like to.

i may be getting one from a co-worker.

that's also on my mind... use the quill for peck drilling and moves to clear the part. the knee for rough positioning and milling in situations where i want the quill retracted for rigidity or need travel...

use the quill for peck drilling and moves to clear the part. the knee for rough positioning and milling in situations where i want the quill retracted for rigidity or need travel...

That seems to work best for me.

Rick G