Author Topic: Suggestion for Engraving  (Read 78458 times)

Offline Doanwannapickle

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Suggestion for Engraving
« on: August 03, 2007, 01:51:38 am »
Until today, when I wanted to engrave something I just selected the true type font and ran the engraving MOP.  I normally use a 90 degree included angle cutter and mill .005 in. deep.

Today, I did it a bit different.  I used the same cutter at the same depth but used the profile MOP.  Actually, you need to use 2 MOPs, an inside and an outside.  I just told the MOP I was using a .010 dia. cutter.

The result was excellent.  It ended up looking exactly like the font.  Better than a single stroke font.

Just thought I'd share,
Walt


Offline 10bulls

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Re: Suggestion for Engraving
« Reply #1 on: August 03, 2007, 09:14:45 am »
That sounds great Walt!  Pictures please!  ;D

Offline Doanwannapickle

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Re: Suggestion for Engraving
« Reply #2 on: August 03, 2007, 18:29:57 pm »
Really tough to get a picture of engraving.  There are 3 different fonts here.  All are .150 tall.  Three are .005 deep and one is .008 deep.

Walt

Offline 10bulls

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Re: Suggestion for Engraving
« Reply #3 on: August 03, 2007, 19:16:54 pm »
Really tough to get a picture of engraving....
Ah, I see!  Sorry to get you at it taking photos, but this is not what I expected...and much better!
Stick fonts are indeed a faff and I'm yet to find a decent one.
Thanks Walt!  I love it when I learn new CamBam tricks! ;D

Offline EL34

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Re: Suggestion for Engraving
« Reply #4 on: August 03, 2007, 20:25:10 pm »
I'm guessing by looks that the left side is the MOP's?

The left side looks really crisp compared to the right side.
Mach 3, Cambam, Autodesk Quickcad 8, machine info -> http://www.el34world.com/Misc/Cnc/CNC0.htm

Offline Doanwannapickle

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Re: Suggestion for Engraving
« Reply #5 on: August 03, 2007, 21:03:06 pm »
I'm guessing by looks that the left side is the MOP's?

The left side looks really crisp compared to the right side.

They're all the same insofar as being produced by CamBam.  They are different fonts and a couple of different depths.  What you're seeing is the difficulty in taking a picture of something so small and shiny.  In person, they look really good.

When I convert that font to a polyline, my cad program dices it up into very small arcs.  There is almost 700 lines of code in each of those engravings, almost all as arcs.  The steppers sound absolutely musical in the way they change tone so rapidly. 

Cheers,
Walt

Offline 10bulls

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Re: Suggestion for Engraving
« Reply #6 on: September 06, 2007, 09:28:56 am »
I haven't had time to try cut this yet Walt, but I wondered if this would work...

I did just one text profile mop then used our new 'trick' to add a negative roughing clearance and increase the cut width so it does one step the other side of the geometry.

Can just make it a template then.

Offline Doanwannapickle

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Re: Suggestion for Engraving
« Reply #7 on: September 07, 2007, 14:27:55 pm »
Ok, it took me a bit to figure out what you had done here.  ???

Took me a bit longer than that to figure out WHY you would want to do it.   :D

My original idea was all about keeping all of the cutting confined to the interior of the font.  The stuff I do is all little and when the cutter gets outside the font lines, the lettering quickly loses its clean look.

BUT, if you're doing large engraving, I can see where cutting on both sides of the line like you're doing might look pretty cool.   8)

Cut something up and give us pictures.   ;D

Regards,
Walt


Offline 10bulls

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Re: Suggestion for Engraving
« Reply #8 on: September 07, 2007, 14:35:17 pm »
My original idea was all about keeping all of the cutting confined to the interior of the font.  The stuff I do is all little and when the cutter gets outside the font lines, the lettering quickly loses its clean look.
I thought you did an inside and an outside mop?
I know your tool diameter was set very small so you in effect ended up with almost an engraving.
I exagerated the inside/outsidedness of my drawing to try to show what it has done, but in practice, if I changed it to 2 cuts 0.01" either side of geometry, is that close to what you did?

Offline Arie kabaalstra

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Re: Suggestion for Engraving
« Reply #9 on: September 07, 2007, 14:59:06 pm »
Ok.. it also took me a while to see what jou've done..

sort of This:



but then inside out.. ;D
you  take the outside contour of the fonts, and profile them on the inside, while the inside contours are profiled on the outside?.. to put it in other words, you machined them with cutter-width compensation.. I get it.. :)

Offline 10bulls

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Re: Suggestion for Engraving
« Reply #10 on: September 07, 2007, 15:14:16 pm »
you  take the outside contour of the fonts, and profile them on the inside, while the inside contours are profiled on the outside?.. to put it in other words, you machined them with cutter-width compensation.. I get it.. :)
Urm, no, or maybe...now I'm getting confused  :o
My method will end up with a 2 parallel V grooves VV where the point in the middle is on the geometry line.
I had a clutch of carbide V cutters arrive yesterday so I will do some investigations tonight and take some pics.

Offline Doanwannapickle

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Re: Suggestion for Engraving
« Reply #11 on: September 07, 2007, 15:16:42 pm »
The inside MOP covered most of the lettering.  The outside MOP was for the letters that have an inside part like 0 and D and P.

Here's a quick sample:

Regards,
Walt

Offline 10bulls

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Re: Suggestion for Engraving
« Reply #12 on: September 07, 2007, 15:29:35 pm »
Ah! The penny has dropped!
Ouch!  I bent to pick it up and it hit me on the back of the head! ;D

If you leave it as a text object (or turn it into a region), doing a single inside profile mop should figure out the inside/outside business for you.

Offline Doanwannapickle

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Re: Suggestion for Engraving
« Reply #13 on: September 07, 2007, 16:35:07 pm »
Ah yes, the region thing.  I tend to forget about that.  It works great, thanks for the tip.

Walt

Offline Arie kabaalstra

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Re: Suggestion for Engraving
« Reply #14 on: September 07, 2007, 20:45:53 pm »
well, you could make each letter a region, so you mill out the entire letter, but, you could also choosse to machine just the contours.. this way, the lettersize isn't increased with a cutter's width.., smaller letters could look better this way..

i think i've got it now... :)