I feel comfortable enough with the laser and would like to add some variety so I figured it was time to try to engrave mugs. Yesterday I cut the bottom of my K40 to allow me utilize the Cohesion Rotary attachment I purchased last year.
I have a Chineseum K40 with a Cohesion3D Laserboard installed. I have a Cohesion3D rotary with the small wheels installed and I’m running whatever GRBL firmware came on the SD card.
I read the documentation and most of forum posts that seem to apply to my situation and was able to successfully hook up the rotary to the A axis and get it rotate, but only about ¼ of a turn on an old test Yeti (36 oz water bottle). I tried to send the G0 A360 command from the console with the same result - ¼ turn. But then, interestingly or related?, it would no longer respond to the console command.
Here are my #A Axis settings:
delta_steps_per_mm 17.77 # may be steps per degree for example delta_step_pin 2.3 # Pin for delta stepper step signal delta_dir_pin 0.22 # Pin for delta stepper direction delta_en_pin 0.21 # Pin for delta enable delta_current 1.0 # Z stepper motor current delta_max_rate 6000 # mm/min delta_acceleration 150 # mm/sec²
The Yeti measures 11 ⅞" in circumference (flat sewing tape on outside) and I have the small wheels installed and set per the documentation I could find. Here are my settings in Lightburn:
So, here’s the TL;DR
The rotary only rotates ¼ turn before coming back to it’s starting position. Any ideas on how I might resolve this?