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Rotary (chuck), “position laser” problem

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2023-06-14

Hi, using an Ortur lasermaster 2 with their chuck.
I am commonly engraving on items around 7cm diameter. To save my remaining braincells I have chosen to set it for a 21cm circumference and for my 21 cm circumferential patterns it all seems to “join up” very nicely. If all the design is set to be “engraved in one session” whether a combination of scanline images and/or vectors it all seems to be positioned properly. What I am still befuddled with is the “position laser” aspect. the rotary is connected to the y axis. if the laser is on the y axis origin and it is told to go to 10.5 cm (ie a half turn) it travels for approx 18cm of circumference, if told to go back to the y origin it does so. Other distances lead to proportional overtravel.

Is it just possible, for whatever reason, that the “position laser” command uses a different rotary conversion system than that employed when actually engraving/cutting ?
C

    • Christian

      2023-06-15
      "7cm diameter … set it for a 21cm circumference and for my 21 cm circumferential"

This is mathematically incorrect…
70mm diameter relates to a 219.911mm circumference. Almost a 10mm difference from the actual size.
Did this in Lightburn, no loss of brain cells, so you have no excuse :wink:
If your rotary is setup properly it should reproduce consistent results.
If you give it an erroneous value and make it work… you’ll have to fiddle with any different sized object.

"“position laser” command uses a different rotary … system than that when actually engraving/cutting ?"
The Lightburn people will have to answer this… but I would think not.
It can also depend on the controller type…
Ensure the rotary chuck rotates 1 complete turn and back when you press the test button in the rotary gui. If this isn’t right it’s probably not configured correctly… and will continually be a problem.

Good luck
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