Tri-angle parts

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Marius Gouws
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Tri-angle parts

Postby Marius Gouws » Tue, Jun 07 2011, 12:59PM

Good Afternoon
When I nest tri-angle parts with other parts the following always happen (see picture). The cutter is cutting into the part next to it.
Thanks in advance
Marius

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http://www.jirehcustominteriors.co.za/p ... chens.html
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Josh Rayburn
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Re: Tri-angle parts

Postby Josh Rayburn » Tue, Jun 07 2011, 3:01PM

Marius,
You will have to add "additonal part clearance" in the "nesting parameters" dialog when nesting triangular parts. This one has bitten me a few times too...
jnr
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Re: Tri-angle parts

Postby Brad McIntosh » Wed, Jun 08 2011, 9:42AM

Since adding additional spacing between parts will screw up your optimization, you may want to try the following...

Edit any parts that have "sharp" or acute angles (an angle less than 90 degrees but more than 0 degrees). Add a VERY SMALL RAD or fillet to the acute corner (maybe 0.001 or possible less is very acute). You want the radius small enough that it will appear to not visible clip the corner but will have the tool path "roll" around it.

(Test first!)
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Josh Rayburn
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Re: Tri-angle parts

Postby Josh Rayburn » Wed, Jun 08 2011, 11:53AM

Hi Brad,
I've experienced compensation failures in the past when the cutter radius is larger than the radius of the arc that is being cut. This only happened when the start point was on one of the endpoints of the arc, and I don't know if this has been addressed by setting start points on the longest entity of a part (supposed to be in the latest version of CN) but I hesitate with that solution for that reason. Have you experienced that same difficulty?
jnr
Josh Rayburn
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Brad McIntosh
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Re: Tri-angle parts

Postby Brad McIntosh » Wed, Jun 08 2011, 1:06PM

Josh,

I have seen some instances in the past where compensation on INTERNAL radius' have generated warning or errors. This I have guessed is due to the radius being "overly-negated", if you will.

The solution that I have suggested above was solely for exterior or outside cuts. The small radius will actually be ENLARGED when the compensation is applied outwardly. Due to the minute radius, the tool will appear to pivot around the point of the triangle.
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Josh Rayburn
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Re: Tri-angle parts

Postby Josh Rayburn » Wed, Jun 08 2011, 2:30PM

Thanks Brad - only a problem on comp-in's then. Good solution!
jnr
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