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Thread: Focus and phony-raster

  1. 03-05-2009, 8:20 PM #1
    Dave Johnson29
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    Focus and phony-raster

    Hi All, This may have been discussed before but I had a job that I vector burned on wood but the customer wanted thicker lines. I estimated the time and cost to raster using 6pt lines and he fainted, well not really, but close too. I had a wild hare and decided to burn a sample using the beam waaaaaaaay out of focus. I set it to 1-1/2" below focus then cranked the power up by about 4-times. Bingo, vector speed and raster line width. Happy customer.
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  3. 03-06-2009, 9:51 PM #2
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    James Rambo
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    Dave, No picture it didn't happen
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  4. 03-07-2009, 10:45 AM #3
    Dave Johnson29
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    Quote Originally Posted by James Rambo View Post
    Dave, No picture it didn't happen
    Man you guys are tough. As luck would have it, yesterday I did not get to switch the laser on so it is still setup for the out of focus burn.

    I will get a piece of MDF, pine or something scrap and correct that oversight. Stay tuned...

    Can't use the actual artwork as it was a little risque.
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  5. 03-07-2009, 12:09 PM #4
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    Quote Originally Posted by Dave Johnson29 View Post
    Can't use the actual artwork as it was a little risque.
    We promise to only read the article
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  6. 03-07-2009, 12:12 PM #5
    Dave Johnson29
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    Quote Originally Posted by Dan Hintz View Post
    We promise to only read the article
    Yeah right Dan, and I have a bridge in Brooklyn going cheeeep

    I went out to the garage to do it and it is 37 degrees out there. What happened to Spring???????? Came in to get a vest and jacket and now too comfy in here to venture out at the moment.

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  7. 03-07-2009, 1:05 PM #6
    Dave Johnson29
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    Proof of concept = fess-up

    OK, here's the samples on some particle/chip board.

    Bear in mind the one I did for the customer was varnished wood so the smoke damage was not there and the edge was surprisingly clean.

    First image in focus is 120 Pulse Width, 254DPI and 42 cm/sec

    Second image 1-1/2" below focus is 550 Pulse Width, 254DPI and 42 cm/sec

    Both took the same amount of time.
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    Last edited by Dave Johnson29; 03-07-2009 at 1:06 PM. Reason: Opps on the 1-1/2
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  8. 03-07-2009, 1:19 PM #7
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    Honest, I only get Sawmill Creek for the articles. I NEVER even noticed there were pictures.
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  9. 03-07-2009, 1:28 PM #8
    Dave Johnson29
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    Quote Originally Posted by John W. Love View Post
    Honest, I only get Sawmill Creek for the articles. I NEVER even noticed there were pictures.
    You have been consorting waaay too much with Mister Hintz!

    I only read the recipes.
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  10. 03-10-2009, 9:12 PM #9
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    Just after I got my laser, I was still using the pantograph for some items that could not be engraved on the laser.. I found a focus depth, and speed/power combination to vector perfect grooves in acrylic masters that would fit the pantograph stylus..
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  11. 03-11-2009, 5:22 PM #10
    Roy Brewer
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    Quote Originally Posted by Bill Cunningham View Post
    .. I found a focus depth, and speed/power combination to vector perfect grooves in acrylic masters that would fit the pantograph stylus..
    Bill,
    A similar use of the principle: I make chocolate molds with three layers of 1/8" acrylic. With a bit of "fiddling' to get the Contour just right on the different layers, perfect "bevel" to release the product.
    "Secret:" between .5" & 1" out of focus(depending on the desired angle)!
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  12. 03-12-2009, 8:54 PM #11
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    Quote Originally Posted by Roy Brewer View Post
    Bill,
    A similar use of the principle: I make chocolate molds with three layers of 1/8" acrylic. With a bit of "fiddling' to get the Contour just right on the different layers, perfect "bevel" to release the product.
    "Secret:" between .5" & 1" out of focus(depending on the desired angle)!
    I'd have to get a box of samples of that chocolate, just to study the technique of course
    Epilog 24TT(somewhere between 35-45 watts), CorelX4, Photograv(the old one, it works!), HotStamping, Pantograph, Vulcanizer, PolymerPlatemaker, Sandblasting Cabinet, and a 30 year collection of Assorted 'Junque'

    Every time you make a typo, the errorists win

    I Have to think outside the box.. I don't fit in it anymore

    Experience is a wonderful thing.
    It enables you to recognize a mistake when you make it again.

    Every silver lining has a cloud around it
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