Centroid Community CNC Support Forum

Posted: **Thu Nov 04, 2021 10:31 am**

Hello All,

Is there a way to decrease the homing speed on the X & Z axis without decreasing the slow jog speed? Right now I have my X, & Y axis slow jog set to 5IPM, which is nice and slow and seems pretty accurate for homing, but obviously its very slow for jogging the machine around (on X & Z only because Y uses a different parameter for homing because I have the auto square enabled). My fast jog is sometimes a bit too fast to jog the machine around, but very useful for when I want to move it out of the way quickly. I know that I can decrease the fast jog speed to where the slow jog speed was (250IPM on X, 50IPM on Z) and be happy, but was wondering if it was another quick and easy way to change these settings.

Forgive me if this has been asked and answered before, I did search the forums but did not see the answers I was looking for. Also I have included a fresh report incase it is something I have missed in my configuration.

Posted: **Thu Nov 04, 2021 12:41 pm**

There is no way to separate the slow jog rate from the homing rate.
The easiest way I can think of is to "roll your own homing file (cncm.hom) using M105/M106

Unfortunately, you have paired axes so what I show below wont work for you "out of the box"
for your paired axes but you could modify the pairing macros to substitute the M105/M106
moves for M91/M92's to achieve the same thing I just don't have time to do it over my lunch hour

If you purchase an hour of support I can modify the macros for you.

All your home inputs are set to 1 so...

1. Move your axis at whatever rate you like until the input opens. I'll use 30.
You can go as fast as you want for this move without effecting accuracy.
Just don't coast through the switch.

2. Move axis opposite direction slowly until switch closes

3. Set home for that axis

;Move Z in plus direction until switch opens
M106 /Z P1 F30

;Move Z in opposite direction until switch closes
M105 /Z P-1 F1

;Home axis
M26/Z

From the mill manual:

13.34 M105 - Move Minus to Switch
M105 moves the requested axis in the minus direction at the current feedrate until the specified switch
opens (if the given P parameter is positive), or until the specified switch closes (if P parameter is negative).
Example:
M105/X P5 F30 ; move the X axis in minus direction at 30”/min until
; the switch on INP5 opens
G92 X10 ; Sets X position to 10
M105/Z P-6 ; move the Z axis in minus direction until switch on INP6 closes
13.35 M106 - Move Plus to Switch
M106 moves the requested axis in the plus direction at the current feedrate until the specified switch opens
(if the given P parameter is positive), or until the specified switch closes (if P parameter is negative).
Example:
M106/Z P3 F30 ; move the Z axis in the plus direction at 30”/min, until
; the switch on INP3 opens
G92 X10 ; Sets Z position to 10
M106/X P-3 ; move the X axis in the plus direction until the switch on INP3 closes

Posted: **Thu Nov 04, 2021 7:18 pm**

centroidsupport wrote: ↑Thu Nov 04, 2021 12:41 pm There is no way to separate the slow jog rate from the homing rate.
The easiest way I can think of is to "roll your own homing file (cncm.hom) using M105/M106

Unfortunately, you have paired axes so what I show below wont work for you "out of the box"
for your paired axes but you could modify the pairing macros to substitute the M105/M106
moves for M91/M92's to achieve the same thing I just don't have time to do it over my lunch hour
If you purchase an hour of support I can modify the macros for you.

All your home inputs are set to 1 so...

1. Move your axis at whatever rate you like until the input opens. I'll use 30.
You can go as fast as you want for this move without effecting accuracy.
Just don't coast through the switch.

2. Move axis opposite direction slowly until switch closes

3. Set home for that axis

;Move Z in plus direction until switch opens
M106 /Z P1 F30

;Move Z in opposite direction until switch closes
M105 /Z P-1 F1

;Home axis
M26/Z

From the mill manual:

13.34 M105 - Move Minus to Switch
M105 moves the requested axis in the minus direction at the current feedrate until the specified switch
opens (if the given P parameter is positive), or until the specified switch closes (if P parameter is negative).
Example:
M105/X P5 F30 ; move the X axis in minus direction at 30”/min until
; the switch on INP5 opens
G92 X10 ; Sets X position to 10
M105/Z P-6 ; move the Z axis in minus direction until switch on INP6 closes
13.35 M106 - Move Plus to Switch
M106 moves the requested axis in the plus direction at the current feedrate until the specified switch opens
(if the given P parameter is positive), or until the specified switch closes (if P parameter is negative).
Example:
M106/Z P3 F30 ; move the Z axis in the plus direction at 30”/min, until
; the switch on INP3 opens
G92 X10 ; Sets Z position to 10
M106/X P-3 ; move the X axis in the plus direction until the switch on INP3 closes

Thanks for this I'll give playing with the macro a try. I am going to have to learn at some point and if not I will reach out to support.

Appreciate the assistance.

Centroid Community CNC Support Forum

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