G53 Z0 Strange Behavior.

[Oldraven]

Hello all,

I need some insight here.
At the first encounter of G53 Z0 the Z-axis rises very slow.
At the next tool changes a call for G53 Z0 is made and the Z-axis rises in normal speed.

I am at a loss, no idea what is going on.
I General Config I only have G21 in the Initialization String.

What is going on?

My G-code;
(PROGRAM NAME - BASE-2D-3.NC)
(POST - MACH 3 MILL METRIC)
(DATE - SAT. 07/09/2011)
(TIME - 09:33AM)

N01 G21 G40 G49 G54 G80 G90 G91.1
N02 G53 Z0. >>>>>                                        Here the Z-axis goes up very slowly <<<<<<

(JOB 1 CENTER HOLE RANDOM POINT PATTERN)
(2MM CENTER DRILL)

N03 M06 T1
N04 S1901 M03
ETC.

Thanks,

Jos
Holland

[Hood]

Put a G0 before the G53Z0, either on the same line or  before and it will move at rapid rate. The reason your move will be slow on the first is it will move at the G1 feedrate you have set at the time, so if just started it is F6 as default. The second time there will have been either a G0 or a G1, with a faster feedrate, preceding the G53.
Hood

[Oldraven]

Hi Hood,

That's it !!

I just tried it, put the G0 in the line N0 along with the rest and the Z worked normal.

That simple!

Thanks,

Jos

Put a G0 before the G53Z0, either on the same line or  before and it will move at rapid rate. The reason your move will be slow on the first is it will move at the G1 feedrate you have set at the time, so if just started it is F6 as default. The second time there will have been either a G0 or a G1, with a faster feedrate, preceding the G53.
Hood

[Hood]

Caught me out a few times in the early days as well
Hood