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Lab talk, the good, the bad, and the ugly
Dental-CAM
Roland Air milling - ghost toolpaths
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<blockquote data-quote="tuyere" data-source="post: 362006" data-attributes="member: 26916"><p>The important question is, is this air cutting impacting your parts? </p><p>If not: It's normal in CNC milling for toolpaths to start with a positive offset from the stock and work their way into it, because they never know exactly where they "should" start cutting, and a little bit of wasted time cutting air is highly preferable to crashing the tool into the stock, almost always breaking the tool, damaging the mill and/or workpiece, or a little of all three. The stock is also never seated with its surface truly parallel to the machine's XY plane, so you often want to do a skim cut across the entire part area to mill in that true-parallel face that'll serve as the upper surface of the part being milled, and that always involves cutting a lot of air until the cutter is fully-engaged in the material at its intended depth of cut. You don't do the latter much in dental milling, but if you ever run calibration/accuracy test parts, you'll see this come into play. </p><p></p><p>If this air cutting is leaving your parts improperly-milled, then that is something else entirely, and is an issue, yes. The cause is hard to pin down without more info.</p></blockquote><p></p>
[QUOTE="tuyere, post: 362006, member: 26916"] The important question is, is this air cutting impacting your parts? If not: It's normal in CNC milling for toolpaths to start with a positive offset from the stock and work their way into it, because they never know exactly where they "should" start cutting, and a little bit of wasted time cutting air is highly preferable to crashing the tool into the stock, almost always breaking the tool, damaging the mill and/or workpiece, or a little of all three. The stock is also never seated with its surface truly parallel to the machine's XY plane, so you often want to do a skim cut across the entire part area to mill in that true-parallel face that'll serve as the upper surface of the part being milled, and that always involves cutting a lot of air until the cutter is fully-engaged in the material at its intended depth of cut. You don't do the latter much in dental milling, but if you ever run calibration/accuracy test parts, you'll see this come into play. If this air cutting is leaving your parts improperly-milled, then that is something else entirely, and is an issue, yes. The cause is hard to pin down without more info. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAM
Roland Air milling - ghost toolpaths
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