A lithophane without a roughing toolpath on 1/4" corian!?!

[bsimages]

That's right!
I cut this 10"x12.5" (actual cut area) Lithophane without a roughing toolpath on .25" corian using a 45 degree V-bit!
I took the picture of this huge sculpture/waterfall at the Jackson Rancheria Casino in Jackson California yesterday.
I have attached the PhotoVCarve cutting parameters page, as you can see I told the software that I am using a 0.031 ball nose bit.
I set the Z zero at -0.1" and cut it in one pass.
Cutting at a 45 degree angle is essential with this method as it is a deep cut.
With the V-bit once the first pass is cut each subsequent pass is only shaving the edge of the previous pass.
This is why the roughing pass is not needed.

Bill Schober
Pine Grove, CA

[lovebugjunkie]

bsimages

Nice Image and great result. Looks like I'm going to have to add PhotoVCarve to my list.

thanks for posting

[joecnc2006]

mind if we sak feed rate and cutting time?

[bsimages]

Look at the second image for the cutting parameters.
It took 16 hours but I cut it slow (30/30 inch per minute) as a test to watch the cutting and make sure it was working ok.
Bill

[calgrdnr]

Great job Bill,
I love it when people come up with better ways and share thank you very much.

I asked http://www.centuriontools.com/index....33447063440298 about 20 deg v-bit and 45 degree so far this is what they said about it.

The only thing close to what you are looking for is a 30 deg v-carve bit 1/2" diameter. We don't have these in 1/4" at this time. 20 deg would be too shallow an angle, the tip would not have a lot of strength. The other option would be an engraving bit, we do not have any on the site yet, but will in the near future

I order bits from them week or so ago. look great, havnt tried them yet.
I am sure they will work great from what others have said. Good prices too.
I will be ordering 30deg to see how it works

Thanks Again Bill

Kent

[calgrdnr]

Opps double post please delete thank you

[bsimages]

Great let me know how well it works!

Bill

[Tony Mac]

Hi Bill,

Great Machining Technique and Thanks for sharing the idea!

Running a roughing toolpath when working with thick material / corian is always a major hurdle for new users. This approach makes it much easier to understand and potentially quicker to cut.

Fantastic Lithophane too!

Tony

[bsimages]

Thanks Tony,
I just cut one at 50/30 (50 inch per minute on the X&Y and 30 on the Z axis) and it came out perfect and took 7 hours and 28 minutes for a complex 10"x12" lithophane...next attempt will be 60/30!
Bill

[calgrdnr]

OK bill that was just mean !! NO Picture . I can't wait to get my bit and give this a try .

[bigz1]

Used a cheap 90 degree V cutter on 3mm White Perspex to see how my DIY machine would handle it. Cut depth was 2mm but everything else very similar to yours Bill. Feed speed 1750mm/min machine time approx 4 hours. Pleased with this first atempt but definatly need something less than 90degrees to get rid of the halo effect. Anyone tried a litho in transparent sheet and lit along the edge(like a fibre optic)?

Thanks for the tip Bill. I notice on your lithophane you have a neat border where their is detail. How do you do it?

[bsimages]

I get the nice neat border because I am using 1/4 inch corian so my Z zero is a 1/10" below actual zero...with a max cutting depth of 1/10" it leaves the lightest areas at -2/10" and the darkest at -1/10 and the uncut area at 0 hence the nice neat border.
Was that clear as...as mud?
Black&Decker sells router bits with 45/60 degree V-bits on each end for under $5. It is what I have been using.

Bill