Slamming Z-Axis Limit Switch

robb

Robb
First: I hope everyone is well and not suffering from the deadly Covid.

[I have MASSO G3 and version 3.46 (latest I believe). I'm running a CNC Router (3D Tek Heavy Mill]

I have Auto Tool Zero set up. It has worked okay but, I recently set up Auto Tool Changing and for some reason things have gone south.

Sequence of failure: I load a file. I Home the system. I set the axis to zero for the job. I CTL+R and then CTL+S. the spindle moves to the Auto Zero location and zeroes the bit. It then dwells for a few seconds before moving to the job. When tool #1 completes the system dwells and requests tool #2. I change the tool, (I don t have mechanical ATC system), myself and hit CTL+S. The spindle moves to the Auto Tool Zero location and auto-zeroes. Then the spindle carriage rises up the Z axis and slams into the hard limit switch ( slams is a bit dramatic but, you know what I mean). That s it. After that I have no control. I have to reboot MASSO. Once rebooted I can t continue the job as MASSO does not request a tool change so, I go for a beer.

The only way I can complete jobs is to save each tool as an individual file. I can then run the job totally manual.

I know I am at fault. I just can t figure out where? I ve gone through Homing and revisited all the general settings and all are good (at least I think so). I ve reset Auto Tool Zero and Changer a few times with a variety of settings and the same problem occurs each time a tool needs to be changed and zeroed. The Z axis slams into the top limit switch and triggers the Z-Axis Limit warning. After that, it s beer time again.

I need to get this sorted for two reasons. 1) If I don t I will become an alcoholic, 2) The time taken to do a job is unreasonable (and, three, I'm not making best use of the systems).

Any help or suggestions will be very much appreciated.

In the meantime, keep safe and well folks.
 

cncnutz

CNCnutz
Staff member
Hi Robb,

Have you checked the Z axis Maximum travel value. This defines the top of travel and since you are hitting the top before the limit comes on it it reasonable to assume that it is wrong or at least something has changed in this area. Has the Z axis homing switch changed position which has lead to the maximum travel value being wrong?

Zero your machine and jog the Z axis up and it should stop before it reaches the top of the Z axis and not crash. If it hits re-home the machine and move the Z axis up as far as you think it should be at the top. Compare the Z axis machine coordinate with the one in the Z axis maximum travel and adjust if necessary.

Cheers Peter
 
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