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Lab talk, the good, the bad, and the ugly
Dental-CAM
EnvisionTec Resale Value
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<blockquote data-quote="TECHARTISAN" data-source="post: 68709" data-attributes="member: 1289"><p>Yes they are operating using the same principle....DLP projection. So yes there is a difference in pixel density from center to edge but this difference is less and less noticible the tighter the projection field/accuracy. Single large parts across the entire field might exhibit some distortion. The b9 is only using 1024X768....and that is still 786432 simultaneous position exposures. 1920 X1080 is 2073600 points. Now the dws008j uses an XY carriage to move the beam....its painfully slow in comparison...but doesnt suffer the "divergence issue" you elude to....However ALL other DWS models use a galvos to steer the beam...so while faster they too suffer spreading inaccuracies...from speaking with a couple of users...its far worse than DLP in that regard do to a single point being projected across the entire platform...versus what is effectively thousands of beams spread across the same area....but Ive no direct experience with their machines so....your milage may vary. There are a few hobbyists working with both galvo and carriage based laser systems as well....but none offering a finished result as of yet.</p><p></p><p>***....they refer to it as ERM enhanced resolution module....it actually only moves into two positions...shifting the image by half a pixel in X and Y. </p><p>It is the same priciple used by early rear projection TVs to fake higher resolution...they called it<a href="http://en.wikipedia.org/wiki/Wobulation" target="_blank"> "wobbulation"</a> this "feature" is being looked at by the hobbyist community as well but due to patents being in force is not being incorporated into public released designs as of yet. However it should be noted that this doesnt truly double resolution...it causes smooting of the pixels that approximates higher resolution in finish. </p><p></p><p>There is at least one group that is working on a multiple exposure system that would index the projector in the X axis during each layer to create a second offset exposure doubling build area at a given resolution....1920X1080 +1920X1080 =1920X2160</p></blockquote><p></p>
[QUOTE="TECHARTISAN, post: 68709, member: 1289"] Yes they are operating using the same principle....DLP projection. So yes there is a difference in pixel density from center to edge but this difference is less and less noticible the tighter the projection field/accuracy. Single large parts across the entire field might exhibit some distortion. The b9 is only using 1024X768....and that is still 786432 simultaneous position exposures. 1920 X1080 is 2073600 points. Now the dws008j uses an XY carriage to move the beam....its painfully slow in comparison...but doesnt suffer the "divergence issue" you elude to....However ALL other DWS models use a galvos to steer the beam...so while faster they too suffer spreading inaccuracies...from speaking with a couple of users...its far worse than DLP in that regard do to a single point being projected across the entire platform...versus what is effectively thousands of beams spread across the same area....but Ive no direct experience with their machines so....your milage may vary. There are a few hobbyists working with both galvo and carriage based laser systems as well....but none offering a finished result as of yet. ***....they refer to it as ERM enhanced resolution module....it actually only moves into two positions...shifting the image by half a pixel in X and Y. It is the same priciple used by early rear projection TVs to fake higher resolution...they called it[URL="http://en.wikipedia.org/wiki/Wobulation"] "wobbulation"[/URL] this "feature" is being looked at by the hobbyist community as well but due to patents being in force is not being incorporated into public released designs as of yet. However it should be noted that this doesnt truly double resolution...it causes smooting of the pixels that approximates higher resolution in finish. There is at least one group that is working on a multiple exposure system that would index the projector in the X axis during each layer to create a second offset exposure doubling build area at a given resolution....1920X1080 +1920X1080 =1920X2160 [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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