Bottom row: If you have dots that are just touching each other then you have a dot size of 0.15mm diameter.Bottom row: If you have engraved dots with equal sized spaces, then you have a dot size of 0.1mm diameter.
Representation of Dot Size File Interpreting The Dot Size Test resultsĮach of the dots on the bottom and middle row are 0.1 x 0.1mm in size. If you have a B-Grade HV-PSU, then you could find your self running at significantly slower engraving speeds Luckily, most A-Grade HV-PSU’s perform at least 50% better than the specification, as shown with my 400mm/s engraving speed. This may seem fast but in practice, a 127 DPI image equates to a maximum raster speed of 200mm/s.ġ dot/ms = 1000 dots/s | 127DPI = 5 dots/mm | 1000 dots/5 = 200mm/s This basically means you will get 90% of the requested power in less than or equal to 1ms. ≤1ms (Time from the TTL Signal is given to the output current up to 90% pre-setting current) MYJG-40W HV-PSU from Cloudray The specified response time for a lot of HV-PSU’s is as follows: To carry out true photo replication you need to replace 1 pixel with dot from the laser. One of the limiting factors of raster engraving is that the response speed of your high voltage power supply unit (HV-PSU) can limit the speed of your engraving. Laser engraved slate – close up of wolf eye The Response Speed Of Your High Voltage Power Supply Unit You can see the detail that is achievable even at what most people would consider a low resolution. The Wolf image towards the top of this page was run at the following settings:īelow is a close up of the left eye. You are unlikely to get a dot size smaller than 0.15mm (170 pixels per inch), and more likely you will be working with a dot size of 0.2mm (127 ppi). While you have some control over the dot size by using different lenses e.g. Photo replication is basically ensuring that one pixel in the image relates to one dot from the laser. Raster engraving involves the engraving of an image or photo, to get as accurate a rendition as possible we use the photo replication process. Raster Engraving / Photo Replication onto Slate Just be careful to make sure there are no gaps between the lines. Overlapping lines are of no benefit with slate, so increasing the interval size will speed up the engraving process as there are less lines to engrave. Slowing down the speed without decreasing the power, will give you thicker lines. You will just need to reduce the power or increase the scan interval. Your machine may not be capable of running at 600mm/s, but whatever your maximum engraving speed is you should be able to mimic these results. This is why I accepted the first test settings as there was no point in trying to go faster. However, after doing some timing trials I determined there was no benefit in engraving faster than 600mm/s. My laser machine is capable of running up to 1000mm/s. Time to complete: 7 minutes 37 seconds Laser Engraving Speed Considerations.The settings for vector engraving slate were: Laser Engraved Heraldic Lion onto Slate Place Mat
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