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Circles/arcs http://www.denfordata.com/bb/viewtopic.php?f=3&t=1978 
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Author:  staffpbu [ Tue 03 Mar , 2009 14:38 pm ] 
Post subject:  Circles/arcs 
Hi when we draw a circle and export to machine it cuts anti clockwise...is there a way we can set the default to so it will run clockwise each time....when we cut perspex it cuts a much cleaner circle running clockwise because of the cutting edge on the tooling thanks Phill 
Author:  Denford Admin [ Tue 03 Mar , 2009 17:25 pm ] 
Post subject:  
Are you using the older version of Techsoft ? The one that uses the Denford/Techsoft extension ? If so, then there could be a way to alter the Denford extension to look for circles and output G02 instead of G03 (or vice versa)... Can you create an example output , and supply the file GENERIC.GNC which will be located here: C:\Denford\Data 
Author:  staffpbu [ Fri 06 Mar , 2009 12:56 pm ] 
Post subject:  
Hi we are using V2...and then export as a design tools transfer file so we can plot to a microuter from V1 
Author:  Denford Admin [ Fri 06 Mar , 2009 13:06 pm ] 
Post subject:  
In that case, then this may work: I looked at the post config file, and it seems as though arc angles greater than 0 output G03 and any others are G02. I'm not sure what specifies a circle, but if its an angle of 0, then G02 will always be specified. Locate this file C:\Denford\Libs\Fanucm.slb Make a copy of it ! Then have a look for this bit of code: Code: * Circular traverse proc circ_trav .... if angle > 0 gcode = 3 else gcode = 2 endif .. return circ_trav Possibly changing this little bit will fix it if circles are specified with a 0 degree angle (and not 360) Code: if angle >= 0
gcode = 3 else gcode = 2 endif I'd need to see a .GNC file with circles in to be sure what will fix it though. 
Author:  Denford Admin [ Fri 06 Mar , 2009 13:14 pm ] 
Post subject:  
sorry had to edit the last post a few times as the forum was loosing parts of the message. ... you might want to refresh it and read it again.. 
Author:  staffpbu [ Tue 17 Mar , 2009 11:47 am ] 
Post subject:  
is this what you need? and many thanks for your help on this subject phill string machine_type (4)="MILL" repeat metric=TRUE real x_datum=0 real y_datum=0 real z_datum=0 real x_dimension=80 real y_dimension=80 real z_dimension=13.2 PROJECT="TechSoft Design Tools  Untitled1" DATE="17.03.2009" PROGID=99 PROLOGUE no_of_tools=1 tool=1 tool_diam=0.3 tool_length=0 DEFINE_TOOL tools_defined tool=1 tool_diam=0.3 tool_length=0 CHANGE_TOOL spindle=15000 CHANGE_SPINDLE x=9.43624 y=7.73154 FAST_TRAV z=2 FAST_TRAV z=0.800001 feed=300 LINEAR_TRAV x=70.1208 y=7.73154 feed=1200 LINEAR_TRAV cx=70.1208 cy=9.73154 angle=90 feed=1200 CIRC_TRAV x=72.1208 y=70.1208 feed=1200 LINEAR_TRAV cx=70.1208 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=9.43624 y=72.1208 feed=1200 LINEAR_TRAV cx=9.43624 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=7.43624 y=9.73154 feed=1200 LINEAR_TRAV cx=9.43624 cy=9.73154 angle=90 feed=1200 CIRC_TRAV z=1.6 feed=300 LINEAR_TRAV x=70.1208 y=7.73154 feed=1200 LINEAR_TRAV cx=70.1208 cy=9.73154 angle=90 feed=1200 CIRC_TRAV x=72.1208 y=70.1208 feed=1200 LINEAR_TRAV cx=70.1208 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=9.43624 y=72.1208 feed=1200 LINEAR_TRAV cx=9.43624 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=7.43624 y=9.73154 feed=1200 LINEAR_TRAV cx=9.43624 cy=9.73154 angle=90 feed=1200 CIRC_TRAV z=2.4 feed=300 LINEAR_TRAV x=70.1208 y=7.73154 feed=1200 LINEAR_TRAV cx=70.1208 cy=9.73154 angle=90 feed=1200 CIRC_TRAV x=72.1208 y=70.1208 feed=1200 LINEAR_TRAV cx=70.1208 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=9.43624 y=72.1208 feed=1200 LINEAR_TRAV cx=9.43624 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=7.43624 y=9.73154 feed=1200 LINEAR_TRAV cx=9.43624 cy=9.73154 angle=90 feed=1200 CIRC_TRAV z=3.2 feed=300 LINEAR_TRAV x=70.1208 y=7.73154 feed=1200 LINEAR_TRAV cx=70.1208 cy=9.73154 angle=90 feed=1200 CIRC_TRAV x=72.1208 y=70.1208 feed=1200 LINEAR_TRAV cx=70.1208 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=9.43624 y=72.1208 feed=1200 LINEAR_TRAV cx=9.43624 cy=70.1208 angle=90 feed=1200 CIRC_TRAV x=7.43624 y=9.73154 feed=1200 LINEAR_TRAV cx=9.43624 cy=9.73154 angle=90 feed=1200 CIRC_TRAV z=2 FAST_TRAV EPILOGUE until last_pass 
Author:  Denford Admin [ Tue 17 Mar , 2009 12:02 pm ] 
Post subject:  
Yep  thats the intermediate file which Techsoft creates, and the Denford post uses to create a CNC file. It looks like Techsoft outputs a maximum of 90 degree arcs  it could well be splitting circles up so as not to go past any quadrants. If this is the circle program, then only the Techsoft software could change the direction of circles. Either with a setting, or possibly by drawing the circles differently ? Might be worth putting the question to them... 
Author:  Mr G [ Fri 13 Dec , 2013 10:15 am ] 
Post subject:  Re: Circles/arcs 
Hi, We have a student who needs to machine a series of ovals on the Microrouter to construct a laminated box. He has drawn them up in Techsoft 2D Design V2 version 2.10 and they appeared on screen as intended, and also cut out cleanly and to the correct size when he did a test run in thin card on the laser. When we save as a dxf however and import into the Microrouter running VR Milling version 5.54.0.630 the drawing import cam page shows the design as whilst still being basically the correct shape, it is made up of a series of straight lines and not the smooth curves as originally drawn, and this new, incorrect tool path is confirmed in the next stages when the outer contour is selected, simulated and machined, this problem also occurs in another design involving a circle. We have tried completely redrawing again with the same results, I am not sure what the “use arc command” is supposed to do when exporting from Techsoft 2D Design as a dxf, but it doesn’t seem to make any difference in this case whether it is used or not. We tried taking a copy the same drawing and using the “Alter the size of the selected objects” command in the 2D Design toolbox, reduced its size to enable it to fit a piece of 160mm x 90mm HIPS, and then saved this as a dxf before importing it into the Triac and where it both simulated and machined perfectly. I understand that if the drawing size is reduced, then any errors will also decrease proportionally, but the Triac version appears perfect, with no distinguishable defects at all. Both the machines are networked and running windows 7 service pack 1, the only difference I can think of is the Triac is using a different version of VR Milling, as it currently has version 5.49.0.613 installed. Is there a setting somewhere that controls the resolution when converting to Gcode, does anyone know of any conflict with our version of 2D Design and the Microrouters version of VR Milling or are we missing an obvious point, because we have never had a problem like this before. 
Author:  Steve [ Fri 13 Dec , 2013 10:49 am ] 
Post subject:  Re: Circles/arcs 
Hi, I am not sure exactly what the problem you have is. When drawing in techsoft a lot of arcs are broken down into straight lines. I have tried exporting a circle and an elipse from Techsoft and importing into another package and the elipse comes through as a series of lines. This happens when exporting to corel or QuickCAM. I am not sure why you have a problem with the arc being lines as it should still machine correctly if there are enough of them. Can you post some screenshots showing the problem and a sample of DXF's. I think this is an issue with the Techsoft. I am unsure as to why different versions of VR milling have a different result selecting a different machine will change nothing other than the material library selection. 
Author:  Mr G [ Tue 17 Dec , 2013 12:49 pm ]  
Post subject:  Re: Circles/arcs  
Hi, thanks for the reply, Here are the a couple of screen shots, dxf and a picture of the machined result, I tried to add the Techsoft 2D Design file but the forum won't allow the dtd extension.

Author:  Steve [ Tue 17 Dec , 2013 14:17 pm ] 
Post subject:  Re: Circles/arcs 
Hi, I have tried opening the DXF in various packages and it apears to be OK. I had V 5.53 on my computer which worked fine. Have upgraded to 5.54 and have the same result as you do. I will forward this to our software engineer and we will get it fixed and post a new version. Short term either go back to your previous version or import the DXF into QuickCAM 2D and post process in that package. 
Author:  Mr G [ Wed 18 Dec , 2013 13:30 pm ] 
Post subject:  Re: Circles/arcs 
Hi, OK, thanks for the quick response; your help is very much appreciated, Kev 
Author:  Denford Admin [ Mon 06 Jan , 2014 15:40 pm ] 
Post subject:  Re: Circles/arcs 
Hi. There is a new version of VR Milling available on the software download site at http://website.denford.ltd.uk/index.php ... downloads. This version number is 5.55. The curves on loaded DXF files are smoothed off as expected. Can you please download and install this new version and see if that works better for you? 
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