Need help with sharp internal corner

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Need help with sharp internal corner

Postby frank131313 » Fri Apr 21, 2017 11:49 pm

SharpInternalCorner.jpg
SharpInternalCorner.jpg
i try to do a rectangle with sharp internal corner with a V-bit 90deg ... or a 120 deg and the result is not perfect does someone can teach me ....?
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Re: Need help with sharp internal corner

Postby Leo » Sat Apr 22, 2017 12:32 am

You MUST use the same cutter in the tool database when you create the toolpath as the actual cutter you use in the machine.
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Re: Need help with sharp internal corner

Postby frank131313 » Sat Apr 22, 2017 1:40 am

yes its what i do
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Re: Need help with sharp internal corner

Postby Leo » Sat Apr 22, 2017 1:43 am

The preview picture looks good.

From the picture of the actual cut it looks like the V cutter is a different angle than the tool path generation.
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Re: Need help with sharp internal corner

Postby scottp55 » Sat Apr 22, 2017 1:49 am

What software runs machine?
Looks familiar, like a setting problem I've seen with people that have Mach3(of which I know nothing)?
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Re: Need help with sharp internal corner

Postby highpockets » Sat Apr 22, 2017 1:50 am

I agree with Leo, check your bit. Just because the label say 60° doesn't mean it is. Read this thread viewtopic.php?p=13653
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Re: Need help with sharp internal corner

Postby frank131313 » Sat Apr 22, 2017 1:35 pm

thank you ... i agree , i'm gonna check the angle ...
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Re: Need help with sharp internal corner

Postby TReischl » Sat Apr 22, 2017 8:15 pm

Scott, I have been running Mach 3 about 10 years now and have never had it cause the problem shown.

That said, I have seen all sorts of problems when things got lose, or the bit was not as advertised, etc.

That is a new one on me?
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Re: Need help with sharp internal corner

Postby scottp55 » Sat Apr 22, 2017 8:26 pm

Sorry Ted:(
It reminded me of Constant Velocity(??) settings where it would over run a corner at first?
My mistake.
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Re: Need help with sharp internal corner

Postby TReischl » Sat Apr 22, 2017 9:15 pm

Scotty, that could definitely happen. Decel set way too high and the machine slams into the corner, everything is stressed to the max and voila, overcut!
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