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Curves cutting in short straight lines
Cutting a largish set of graphics which consist of a lot of curves most cut ok but where the curves tighten it turns into a series of short straight lines. Redrawn and re-cut, no nodes in this area. Using Corel 12 and graphtech cutting master.
Any ideas as I am now hand cutting all these areas with a scalpel !Chris
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18 Replies
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You would be quicker highlighting the nodes and convert to curves with symmetrical node elements. Solve the problem pre-cut…..
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That’s the problem there are no nodes at all, it only happens where the curve increases and only on large pieces.
Chris
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what format are you exporting through to the cutting software in ?
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are you doing the art work at full size in corel or reduced then scaling up in CM.
i old software there used to be a setting to control this can’t remember what it was called. else to do a big curve there will be thousands of coordinates.add more points around the curve to help control the output.
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Drawing it full size, cuts fine until the curve radius tightens then goes to a series of straight lines (50p style)
I cut directly from coral using cutting master plug in.
The graphtec manual says something about a setting in the cutter for smoother curves.
Only seems to do it on large pieces
Chris -
Still having problems, tried re-drawing with added nodes, checked all the settings in the plotter. It’s fine on small stuff but still cuts curves as a series of short straight lines when on larger items.
Chris
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This has happened to me but it was nearly 20 years ago and for the life of me I can’t remember what caused it..
Something to with HPGL language and going through a parallel port instead of a serial one (or vice versa)
Sorry…I know it’s not much help
Is this a new problem or one you’ve had since set-up?
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It’s on a USB, had the issue once before but maybe allways been there as it’s only recently I have started doing large curves
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Still having difficulties with curves cutting in short straight lines, Have just cut some 500 mm high lettering which of course contains varying curves, this was fine. Then i cut the rest of the graphics (crescent shapes) only to find they were a series of short straight lines again. The only nodes are the ones at either end (points).
Tried cutting elongated ovals and it’s ok up to ovals of about 200mm long, anything bigger and its straight lines again.
Cutting direct from Coral with cutting master.
Have a very old Flexi that came with my old plotter (second hand and am wondering if I can get the graphtec to work from that, seems to need different settings.Chris
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The last time I saw this yonks back when using flexi was when you could tell the software to cut the quickest way possible, and basically what the software did was delete so many nodes out of curves to enable the quickest cut, thus making a circle look like a 50p piece.
Nigel
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Nigel, cutting from Corel (never been able to get Flexi to work HPG thingy I think), cutter is only on 15 speed, set to minimise media movement.
If I had any hair I’d be pulling it out, something has to go, either Corel and cutting master or the Graphtec !Chris
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You say cutting it small is ok but when cutting it larger / to size it happens, now I’m a Corel noob by any standards but could it be that the page size in Corel for this job is not long enough and so the "graph is clipped" as in trying to cut the job in a shorter page size ??
Just guessing because I don’t supply Graphtec cutters but have seen some weird problems before with cutters and CorelDraw.
Nigel
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have a look at the STEP PASS command in the plotter menu. it should be set to "0" if set any higher will do as i think you describe
its under option 1
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Chris, try downloading a demo of signtools4. That works inside CorelDraw.
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Thanks everyone, tried all suggestions but still no luck, step size at 0, speed down to 8, still the same, do you thing re-loading all the software would help ?
One odd thing, the item i was test cutting, I cut in half to only cut the portion that was cutting in small straight lines and this portion cut alone is fine but cut the complete graphic which has a gentle curve which increases at the end and the tighter curve is stepped.Chris
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Is this just happening on fonts or on drawn circles and elipses?….I’m just wondering if the fonts are corrupt?
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Fonts are fine, it is just on drawn curves and only where a curve decreases radius.
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Finally seem to have got somewhere, after talking to graphtec who tested my files and found them all ok I re installed Corel and cutting master. this made no difference, tried changing just about every setting with no luck. Finally out of the blue I just added a node for no reason and bingo, so now if i just add a node somewhere on a curve it cuts correctly !
Confused !Chris
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