Hello

I'm construction a wing. And i use skin surface to 'cut' the foils i need. The cuted foils outline consists of a lot of tiny lines. I used connect curves in order to get one line. Then i export it to dxf and generate the NC file with Cut2D. When i start my mill it still has all the tiny lines and it cuts along this tiny lines. Which means stop and go for my mill. this is not good for my mill and it is time consuming.

So my question is. Is there an other way to get rid of this tiny lines or what else can i do to convert the these lines in to one line. I also tried right mouse click, change object type but with the same result.

You can change the lines to polyline or another type using change object type command under edit.

Tim


It would be awesome to get that composite curve integrated for things like this among others that have been discussed in the past.


Thanks

Jason

>>>>>> Yes understand. For this instance I think the OP should be able to use existing tools to create a single polyline for DXF export. A polyline comes in as a single entity into AutoCAD.<<<<<<<

Tim

Yes a polyline comes in as a single entity composed of many little line segments. The cam software then has to stop start or change acceleration at each point on each small segment. So the less small segements the better. It's much better to have small fitted arcs than a bunch of little line segements. A almost straight line can have 5-10 segements when it's a polyline.

In these cases the geometry from splines and polylines I would draw over top fitting 3 point arcs and delete all the small lines/ polylines. Then the cam profile is smooth and faster.
In a lot of cases normal longer lines and or arcs and circles can take the place of all the little line segements in a polyline.


Thanks

Jason

Sorry that it took so long for my answer. But here are my files i did some test with.

The vcp file contains a foil with some 243 control point spline. It was generated from a skin surface with cut section. If i do a select chain and change type to polylines i have 243 polylines. I've tried DXF exports with R12 and R14 both with the same result. I also tried with dwg export same result.

The txt file is the G-code file

Edited by user Monday, December 15, 2014 4:54:39 AM(UTC)  | Reason: Not specified

I've done the CNC cut and it is still the same. A lot of tiny steps and the machine slows down with this stop and go. Unfortunately this is 70% of the cad work i'm doing, - making some cut section from skins and cut them on my cnc mill. Attached is the file i have been working on.

A college of mine uses rhino i think and he has no problem at all using the same (Cut2d) tool for generating the nc file. So, what am i doing wrong? Can someone please help me? Or am i using the wrong cad tool for this stuff? That would be hard, because i spend now 2 years learning and working with ViaCAD.

I have a 3d file generated from a dxf export for milling, i hope this will work. I'll try it within the next week.

Martin

Use the arcs from curves tool on the splines before anything else. Select the tool and hold down shift and select a bunch of splines one by one and it will create a arc fit to those splines. So pick 20-30 at a time to get smooth arcs. The key is to select several with the shift key vs selecting all the lines and splines. You can set the tolerance in the top before using the tool.

The Cnc equipment used circular interpertation on arc so it slows acceleration but doesn't stop like on lines. Line are stop start end points. So even if you have 20 some arcs and a few lines in the linear areas l after changing all the splines it should cut ok



Regards
Jason

Martin

The arc from curve tool is in the arc toolbar last tool. This tool will give you what you need.

Regards
Jason

The way things are sounding to me, Check the direction of the lines(splines). I'm going to assume the cnc program is for "hobby"- that is, it's not running on a Mazak 250,000buck machine correct?
Captain Canardly>johnny