Lettering Problem - Help needed

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Lettering Problem - Help needed

Postby pj26 » Mon Jul 29, 2019 11:57 am

I am a newbie to cnc routing and need some guidance please.

I am making an urn and am having problems with the lettering I getting. In Vcarve pro 9.5 everything looks good, but when it is engraved on the wood I get rounded corners when they should be a straight crisp intersection. The depth of the cut is more than twice what the toolpath preview is showing in Vcarve which is causing the lettering to overlap and look nothing like what I see in the preview. Prior to carving I did set the tool z axis with the touch plate.

I have attached the .crv file I made.

Any help/suggestions will be gratefully accepted.

Pete
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Re: Lettering Problem - Help needed

Postby Bob » Mon Jul 29, 2019 1:00 pm

Pete,
My first question is: Have you made any other Vcarvings yet, that turned out as planned?
Bob
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Re: Lettering Problem - Help needed

Postby pj26 » Mon Jul 29, 2019 6:40 pm

This is my first attempt at lettering.

I did a spoil board, I put through holes on 2 inch centers, surfaced it and routed lines making a two inch grid. This turned out as expected.

With this project it is my first time using V-carve/engraving toolpath tool.
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Re: Lettering Problem - Help needed

Postby tonydude » Tue Jul 30, 2019 7:47 am

Have you zeroed out the bit on top of your material? Also do you have virtual zero which helps with uneven thickness of the boards?

Tony
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Aspire 9.518, photo vcarve, cnc mako shark extended bed, control panel 2.1
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Re: Lettering Problem - Help needed

Postby sharkcutup » Tue Jul 30, 2019 8:46 am

In your tool path setup there is no Flat Depth (F) recorded so the program will use the depth recorded in the toolbase setup which in this case showa .125" which I believe may be causing your problem issue. Try setting a depth 0f .050" for Flat Depth (F) and try it again on a piece of scrap then adjust this depth accordingly.

This is all based on if you have setup z-zero correctly and you are using z-zero for the variations in the material boards surface as stated by Tony in the previous post.

Good Luck and Happy Carving!

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Re: Lettering Problem - Help needed

Postby pj26 » Tue Jul 30, 2019 11:35 am

Thank you for helping me.

I have zeroed out the bit at the top of the board using the touch plate. (I checked the software settings for the touch plate and it is good)

I have not set up z-zero as I am using scrap plywood and that appears to be relatively flat. Do you think it's necessary?

I will give it a try this afternoon setting up the flat depth as suggested and then I will let you know how it turned out.

Thanks - Pete
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Re: Lettering Problem - Help needed

Postby Bob » Tue Jul 30, 2019 2:47 pm

Your toolpath settings look good to me. And the preview looks good. Therefore, I'm suspecting that you are doing something to cause a different outcome than what the preview shows.
So,
Which post processor are you using?
Also,
Are you sure that you're using the same v bit as specified in your toolpath? 90V?
Bob
Last edited by Bob on Wed Jul 31, 2019 6:12 am, edited 1 time in total.
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Re: Lettering Problem - Help needed

Postby bill z » Tue Jul 30, 2019 6:11 pm

pj26,

I've had similar experiences where square corners get rounded. What I did to fix my problem was to set the speed of my cut in the tool section slower, like half the speed. It has to do with centrifugal forces and what not. I think the machine does the rounding. That is why you don't see it on the software rendering.

Try it on a piece of test and let us know what happens.
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Re: Lettering Problem - Help needed

Postby pj26 » Wed Jul 31, 2019 12:24 am

Post Processor is: CNCShark-USB Arcs (inch)(*.tap)

No change so far with the suggestions posted.

I will slow the feed in the morning and try again.

Thanks to all -
Pete
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Re: Lettering Problem - Help needed

Postby sharkcutup » Wed Jul 31, 2019 6:53 am

please attach photo of your most recent carving so that we may see exactly what you are talking about.

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