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Lithophanes
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| tweakie |
Dátum/Date: Péntek, 2012-12-14, 13:56 | Üzenet/Post # 1 |
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A new topic for Lithophane and similar related works.
Success consists of going from failure to failure without loss of enthusiasm. |
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| JJWMACHINECO |
Dátum/Date: Péntek, 2012-12-14, 15:15 | Üzenet/Post # 2 |
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John,
I have always used a BEM on Lithos and have gotten allot more detail from what I have seen others get using a V-bit. From reading posts on the PVC forum the biggest reason for using a V-bit is removing allot of material quicker because they start out with a 1/4" thick piece of Corian and have to cut around .200" total depth and do it in one pass. I can't do this with a .031" BEM without making a couple roughing out passes first so I use a different approach.
I start out with .5" thick Corian and pocket out an area in the back .360" depth the size of the Litho I will be making using my CNC milling machine. I leave between .200"-.250" width wall all the way around the pocket to strengthen it for clamping it down flat to my CNC router table. I can then cut the Litho on the other side of the pocket in one pass the required .09"-.1" depth using the .031" BEM with a stepover of .005". I get very good results and amazing detail with this process. I have even used as small as a .015" BEM with a .003" stepover to do a finish pass and the detail would blow you away.
The way PVC works, when you specify a tool type and diameter, it will skip over fine detail of the original image because it knows the tool is to big to go into those areas and that is when detail is lost. John, I guess the biggest question would be is there a tip diameter for the V-bit in the calculations of the toolpath using the Rotary Engraving setting? If it's doing the calculations based on a sharp point, then it should create code with the most detail that is possible. I was comparing your Pixel Resolution with the stepover setting I was using in PVC and I must have got that wrong. 
Thanks. Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver |
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| picengraver |
Dátum/Date: Péntek, 2012-12-14, 18:24 | Üzenet/Post # 3 |
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Good Morning Jeff,
I use .25 Corian for all my lithos. I buy full sheets from a local cabinet shop and cut to size as I need. I use double stick tape (Duck brand from WalMart) to stick my blanks down onto my spoil board. I then pre-thin with a flat router 3/4 inch bit to .15 inch thickness. I then switch to a 1/8 inch diameter, 20° carbide engraving V-bit with about a .2 mm tip to engrave the lithos. I engrave single pass to a max. depth of .1 inch at 50 ipm, leaving the thinnest parts at .05 inches thick. The problem I see when trying to use larger bits is that small white areas (people's eyes) will be magnified in size by the bit if the tip diameter/angle is too large, ruining the appearance of the final litho fo me. To prepare some images, I often edit the small white areas and make them smaller before generating the gcode. Engraving V-bits with angles less that 20° would do even better, but they tend to be too fragile for Corian (frequent tip breakage). I've had good luck with V-bits from China that are sold on eBay.
PEP has no provisions to adjust for tool tip diameter and relies on the use of sharp V-bits. I have not seen a need to engrave at less than .01 inch pixel resolution, but I do use the 2x engraving angles for .005 inch line separation to eliminate tool tip lines. Perhaps ball end mills may be better, and I should try some someday to learn how they do and compare.
After a litho finishes engraving, I scrub the surface well with a thick paste of Bon Ami pot cleaner and a stiff tooth brush to remove the Corian dust adhering into sharp recesses of the surface. Sometimes I also use a brass bristle brush first.
I think that if the end result of one's engraving procedures is pleasing, then whatever techniques work best for each user is good. I may be inadvertently skipping some details now, so please ask if I need to clarify anything else.
JohnHozzáadva (2012-12-14, 18:24)
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Tweakie,
Thanks for starting this new thread. I hope it gets used as much as the laser diode thread. Now all I need to do is learn how to post images properly. Can't seem to master that yet 
John
I paint with a blue light beam. |
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| KisKZ |
Dátum/Date: Péntek, 2012-12-14, 20:58 | Üzenet/Post # 4 |
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I'm very happy because you start this topic!
In hungarian section now We purchased lot of plastic for this.
I hope we will learn many more special technics from you!
Go ahead!!
Peter |
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| tweakie |
Dátum/Date: Szombat, 2012-12-15, 08:04 | Üzenet/Post # 5 |
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Quote Tweakie,
Thanks for starting this new thread. I hope it gets used as much as the laser diode thread. Now all I need to do is learn how to post images properly. Can't seem to master that yet
John
Hi John,
I have sent you a PM.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| tweakie |
Dátum/Date: Szombat, 2012-12-15, 08:24 | Üzenet/Post # 6 |
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Unfortunately, Corian (definitely the best material to use) is not commonly available here in the UK so I have to make do with 3mm thick opal Plexiglas, which easily melts onto the tool tip unless coolant / lubricant is used.
This white tiger took approx. 8 hours to complete (342,000 lines of GCode) using a 1.5mm ballnose cutter and relatively slow feed rate.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| Amatőr |
Dátum/Date: Szombat, 2012-12-15, 10:14 | Üzenet/Post # 7 |
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tweakie, try simply use Polystyrene! I used 3mm thick to carve lithophane with 0,2mm upper and 0,3mm bottom offset. The results are here.
Jeff, I think using BEM is make the work necessary to do roughing before, so it will be longer time. The V bit I tried is 0,2mm shaped to radius, so it is a pseudo BEM with single flute, but can work with a single pass.
H1i.hu |
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| picengraver |
Dátum/Date: Szombat, 2012-12-15, 12:22 | Üzenet/Post # 8 |
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Here is one I did yesterday of friends for Christmas.
Tweakie, Thanks for image posting help.
John
I paint with a blue light beam.
Az üzenetet módosította/Modified by picengraver - Szombat, 2012-12-15, 12:23 |
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| tweakie |
Dátum/Date: Szombat, 2012-12-15, 12:47 | Üzenet/Post # 9 |
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Thanks for the tip Amator, I will give Polystyrene a try. If I can get anywhere near to the quality of your work I will be more than pleased.
Nice work John, they will be delighted with that. 
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| JJWMACHINECO |
Dátum/Date: Szombat, 2012-12-15, 13:05 | Üzenet/Post # 10 |
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I am using Corian and can do them in one pass with the 1/32" BEM with the process and setup I use. My spindle runs at 45,000 RPM and it's a very precision, Precise brand grinding spindle so I'm able to run at 50IPM at a stepover of .005" without breaking my small 1/32" BEM bits.
Tweakie, that Tiger Litho came out very good. What software did you use and @ what stepover/pixel resolution?
Amatuer, that Litho of your son looks just like the original photo and the detail is amazing. What software and what stepover/pixel resolution did you use?
John, I know what software you are using. 
My very first Litho I ever made went to the extremes. It took 34 hours to cut with a Bosch Colt and it was only 7-1/2" wide by 5" high. Did it with 3 different size BEM's. First roughing with a 1/16", then a 1/32" and finished with a 1/64". I really wanted to see how much detail I could get with PVC and here is the results. The picture was an antique glass negative I scanned and inverted.
I will be experimenting with PEP today and see how it works out.
Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
Az üzenetet módosította/Modified by JJWMACHINECO - Szombat, 2012-12-15, 13:30 |
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| tweakie |
Dátum/Date: Szombat, 2012-12-15, 13:41 | Üzenet/Post # 11 |
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Quote Tweakie, that Tiger Litho came out very good. What software did you use and @ what stepover/pixel resolution?
I'll have to check the GCode for the step-over and come back to you on that one.
I didn't want to own-up but the software used was PVC ( sorry John, but it was done some while ago before I had heard of PicEngrave )
Nice work Jeff, there is certainly a lot of detail in that litho.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| JJWMACHINECO |
Dátum/Date: Szombat, 2012-12-15, 19:45 | Üzenet/Post # 12 |
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Thanks Tweakie.
John,
Your friends will be very pleased with that Litho and the detail is amazing. Maybe I need to invest in some V-bits and give them a try. 
Jeff
Hozzáadva (2012-12-15, 19:45)
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Here are 2 night lights I just made that are 3." X 3.75" in size. Used .005" pixel resolution and Engraving Angle was Right-45 degrees with a 1/32" BEM, .09" cut depth and set feedrate @ 50, but it averaged @ 35. Took 2 hours each to cut in one pass. Since these are small lithos and the original images were digital paintings, not digital photos, they came out pretty good considering and I would say my first try with PEP was successful. Also since the Litho image was not flat on the scanner bed, the picture I'm posting is a little out of focus as you can see. They do look allot better in person. 
Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
Az üzenetet módosította/Modified by JJWMACHINECO - Szombat, 2012-12-15, 23:15 |
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| tweakie |
Dátum/Date: Vasárnap, 2012-12-16, 09:24 | Üzenet/Post # 13 |
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As always, excellent work Jeff.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| Amatőr |
Dátum/Date: Vasárnap, 2012-12-16, 09:36 | Üzenet/Post # 14 |
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tweakie,
Quote (tweakie) I will give Polystyrene a try.
I'm sure You'll not be disappointed.
Jeff,
Quote (JJWMACHINECO) What software and what stepover/pixel resolution did you use?
I used AC to generate gcode with 0,1mm stepover, I don't know what was the resolution.
You made awesome works again! 
H1i.hu |
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| JJWMACHINECO |
Dátum/Date: Vasárnap, 2012-12-16, 23:19 | Üzenet/Post # 15 |
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Thanks again guys.
Amatuer, what is AC g-code software? 
Jeff
Hozzáadva (2012-12-16, 23:19)
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Never mind Amatuer I figured out what AC is.
Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
Az üzenetet módosította/Modified by JJWMACHINECO - Hétfő, 2012-12-17, 00:12 |
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| tweakie |
Dátum/Date: Kedd, 2012-12-18, 13:14 | Üzenet/Post # 16 |
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Quote Amatuer, what is AC g-code software?
Hi Jeff, I think that is a reference to ArtCam.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| JJWMACHINECO |
Dátum/Date: Kedd, 2012-12-18, 13:26 | Üzenet/Post # 17 |
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Thanks Tweakie,
I figured that out because it came with my mini router and have been playing around with it. Cool program. I was going to try a Litho with it today.
Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver |
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| picengraver |
Dátum/Date: Péntek, 2012-12-21, 23:57 | Üzenet/Post # 18 |
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This is a night light I made today for a good neighbor of his dog, Toby.
About 3 x 3 inches - .1 inch pixel resolution - .005 inch line spacing.
Merry Christmas All,
John
I paint with a blue light beam. |
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| JJWMACHINECO |
Dátum/Date: Szombat, 2012-12-22, 17:35 | Üzenet/Post # 19 |
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Excellent Litho John.
Sorry John, but I wanted to try AC because it allowed me to select a 1/32" BEM and it generated the code based on that tool. My wife loves MM, so I made her a 3"X3.75" night light. Setting was .1" depth of cut with a .005" stepover and I set it at a .0001" toolpath accuracy.
Merry Christmas everyone.
Jeff
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver |
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| KisKZ |
Dátum/Date: Szombat, 2012-12-22, 18:12 | Üzenet/Post # 20 |
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Jeff!!!!
It's beautifull job!!!!!
Congratulations!!!! |
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