epiloglaserfocus
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| epiloglaserfocus [2024/09/25 01:18] – andrewhowlett | epiloglaserfocus [2024/09/27 17:45] (current) – andrewhowlett | ||
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| Under normal circumstances the distance shown in the Focus Menu should be about the same as your material thickness. For instance, if I'm engraving on 1/4 inch ply, then after manual focus the focus menu should show about 0.25. Error is often in the range of 0.03, so a number between 0.22 and 0.28 would be normal. If the focus plane is different from the thickness of your material then check for warp. You should also check that your material is flat against the bed. If you push down on your material and it goes down then it isn't flat. If your material is flat and seated properly and the focus error is greater than 0.05 then ask someone for assistance. See "How focus numbers work" at the end of this page for more details. | Under normal circumstances the distance shown in the Focus Menu should be about the same as your material thickness. For instance, if I'm engraving on 1/4 inch ply, then after manual focus the focus menu should show about 0.25. Error is often in the range of 0.03, so a number between 0.22 and 0.28 would be normal. If the focus plane is different from the thickness of your material then check for warp. You should also check that your material is flat against the bed. If you push down on your material and it goes down then it isn't flat. If your material is flat and seated properly and the focus error is greater than 0.05 then ask someone for assistance. See "How focus numbers work" at the end of this page for more details. | ||
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| Auto-focus should always be turned off in the dashboard. | Auto-focus should always be turned off in the dashboard. | ||
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| The laser is focused for maximum intensity which is slightly different that the waist of the focused beam. When I say focal plane I'm talking about the plane of maximum intensity not the plane where the beam is of minimum diameter. This is possibly a nit-picky deatil since it is likely that the two planes are very close together. | The laser is focused for maximum intensity which is slightly different that the waist of the focused beam. When I say focal plane I'm talking about the plane of maximum intensity not the plane where the beam is of minimum diameter. This is possibly a nit-picky deatil since it is likely that the two planes are very close together. | ||
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| + | ===== The Cutting Table is not Perfect ===== | ||
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| + | The cutting table is not perfectly level. Nothing is perfectly level. By focusing on different spots on the Fusion Pro 24 table I measured 0.000 at the top left (0,0) corner of the table, 0.025 at the centre of the table, and 0.064 at the far corner (24,24). So you can expect variation on the order of at least 0.035 due to variations in the cutting table. | ||
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| + | ===== How much variation in focus depth is acceptable? ====== | ||
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| + | This is an interesting question. Lasers usually form gaussian beams. For a thorough discussion on the propagation of a gaussian laser beam you can find papers like this on the internet [[https:// | ||
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| + | | distance from focus (inches) | ||
| + | | 0.000 | ||
| + | | 0.010 | ||
| + | | 0.020 | ||
| + | | 0.030 | ||
| + | | 0.040 | ||
| + | | 0.050 | ||
| + | | 0.060 | ||
| + | | 0.070 | ||
| + | | 0.080 | ||
| + | | 0.100 | ||
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| + | |||
epiloglaserfocus.1727227118.txt.gz · Last modified: 2024/09/25 01:18 by andrewhowlett
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