"Dwell" Command

[cnc-maker]

Hi Guys,

we have a program that first drills app 100 3mm dia holes on a sheet. The next program runs an almost identical path but uses a 6mm dia countersink bit to chamfer the 3mm holes. This has been working perfectly. Then we had to change the countersink brand as the old brand were out of stock. The new countersink did not seem to leave quite as good a finish so we added a o.3 second "Dwell command at the bottom of the hole. This seemed to work perfectly. However when the program had finished we noticed that when the bit was homed it was slightly higher. Also as the program ran; the countersink holes got shallower and shallower in the sheet . At first we thought the bit was moving in the collet. But it wasn't. We tried the old countersink bit... and same problem. The countersinks got shallower and shallower as the bit ran through its program across the sheet. After a process of elimination we decided to remove the "Dwell" command. And voila!. The problem dissapeared.

Does anybody have any ideas on how a "Dwell" command can interfere with the "Z" Axis movement?



Thanks in advance

 

[masso-support]

the Dwell command does not impact any motion but it looks like you are missing steps on your Z axis, this can be due to too much load on the axis when cutting, this might be caused due to heavy cuts.

As a test run the same gcode program with Dwell but don't load any tool and just do a dry run. measure the position of the Z-axis before and after running the program. the idea is to test the program without any load on the Z-axis to see if any steps are being missed due to overloading.