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•
The parameter horizontal feed equals the feed of the laser tool and should lie between 1
previously found feed rate. Revolutions per minute is used to determine the power of the laser. We recommend
using values between 20% (Value 51) and 100% (Value 255).
•
In order to set the cycle count, you can apply a trick: Set the infeed to 0,01 mm. The thickness of the material now
should be set to reflect the amount of cycles you need – ignoring the true thickness of the material. If you need 4
cycles, set the thickness to 0,04 mm. If you need 6 cycles, set it to 0,06 mm.
•
Be sure that the safety and working heights are set to 0 to avoid the laser brushes losing contact to the surface and
thus allowing scattered laser light to escape.
•
Generate the toolpath and save the G-code. Send the code to your CNC software and start your job following the
instructions of „5.3 Starting a Test Job".
5.4.3 Engraving a Picture
Before starting an engraving job, you definitely have to calibrate your laser tool. You will have to calibrate your tool for
every material, as every material demands for different laser settings in order to achieve good results. For engraving jobs,
STEPCRAFT recommends to perform two automatic testing scenarios: A black-contrast-feed test and a grey-scale test.
Feel free to download both test files:
The reason to perform a black-contrast-feed test is to establish the needed feed rate (with maximum power) to achieve
good results on the individual workpiece. During the test, the laser will burn multiple lines into the material. The program
slowly rises the feed from 6 to 44
A faster feed will produce a brighter line. The optimal feed is the highest speed which still burns black lines into the material.
The table on the next page shows the speeds which the test will go through.
Black-contrast-feed test
https://www.stepcraft-systems.com/
service/black-contrast-feed-test.nc
/
. The slower the laser is moved over the workpiece, the darker the line will be.
mm
s
Grey-scale test
https://www.stepcraft-systems.com/
service/grey-scale-test.nc
64
/
and 50
/
. Set your
mm
mm
s
s
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