[Cartierusm]

Howdy, I use MDI alot and sometimes it moves the CNC at it's regular fast jog speed of 60 IPM, and sometimes it moves at a real slow 5 IPM. Is there any reason for this, most of time I don't think it's near any limit switches, which is what I originally thought, it's moving slow cause it's near a limit (read Soft Limits). Any advise is appreciated. Thanks.

[ger21]

The feedrate is persistent, so G1 moves will be at whatever the current feedrate is. You can change it on the runscreen by typing it in the DRO, or just type it in the MDI line. F60 if you want 60ipm.

[Greolt]

When you use the MDI do you enter G0 or G1 at the beginning of the line?

If neither are entered then Mach will use the one which was last used.

These commands are what is called modal. That is they stay in effect until another command overrides them.

So if you do a move via MDI eg. X10 Y8 and the G0 is active it will move at rapid speed.

That same X10 Y8 command if G1 is active will move at the set feedrate which also stays set until changed.

I use the MDI a lot and always enter "G0 X10 Y8" or "G1 X10 Y8 F20"

Hope that makes sense.

Greg

[Cartierusm]

Yes it does thanks. So I can just type x7y7f60 and I'll be set?

[Greolt]

No if you want a feedrate move as opposed to a rapid then type,

G1 X7 Y7 F60

Then you can use

X8 Y9

X10 Y10

and these will also go at F60

Greg

[Cartierusm]

OK thanks.