tag:blogger.com,1999:blog-89958510566871283252011-11-27T16:51:07.168-08:00Helping beginners to use CAD for CNC machining.CAD2Gcodehttp://www.blogger.com/profile/14873995996854582091noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-8995851056687128325.post-10663847269124677672009-02-02T07:37:00.000-08:002010-08-09T16:51:24.441-07:00<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://3.bp.blogspot.com/_ZUF2HqBN97E/SYcTk3n6lFI/AAAAAAAAABY/tS19CZ9SEFo/s1600-h/stepm.JPG"><img style="MARGIN: 0pt 10px 10px 0pt; WIDTH: 173px; FLOAT: left; HEIGHT: 172px; CURSOR: pointer" id="BLOGGER_PHOTO_ID_5298225010752263250" border="0" alt="" src="http://3.bp.blogspot.com/_ZUF2HqBN97E/SYcTk3n6lFI/AAAAAAAAABY/tS19CZ9SEFo/s320/stepm.JPG" /></a><br />This Part Drawing can be used to machine, in the way you want the operations to be performed.<br />Looking at the part to be made, will require 3 machine operations.<br />Spot and drill 5 holes<br />Circular pocket mill the large hole<br />Mill the outside profile<br /><br /><br /><br />In this example I'm using the CMS IntelliCAD 6 SE program.<br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcXVrxSnlI/AAAAAAAAABg/Zk6Z0ct3_RU/s1600-h/sq3.JPG"><img style="MARGIN: 0pt 10px 10px 0pt; WIDTH: 182px; FLOAT: left; HEIGHT: 168px; CURSOR: pointer" id="BLOGGER_PHOTO_ID_5298229147918835282" border="0" alt="" src="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcXVrxSnlI/AAAAAAAAABg/Zk6Z0ct3_RU/s320/sq3.JPG" /></a><br />Point is the First CAD command and the First machining operation.<br />Clicking on the Circle places a dot in the center of each Circle. Points are used for Drilling and can be selected in the order of Drilling.<br />Starting with the Center, moving to the lower Left Circle, up to Top Left, over to the Top right and to the lower Right.<br /><br /><br />This is the way the DXF conversion program will see XY Points.<br />The Gcode would look like this.<br />N10 ( 1/4" Spot Drill )<br />N20 M6 T1<br />N30 M3 S8759<br />N40 M8<br />N50 G00 G43 H1 Z0.1000<br />N60 G81 X1.0000 Y1.0000 Z-0.125 R0.1000 F17.5<br />N70 X1.7501 Y0.2500<br />N80 X1.7500 Y1.7501<br />N90 X0.2499 Y1.7500<br />N100 X0.2500 Y0.2499<br />N110 G80<br /><br /><br /><br />The Next Machining Operation is to Mill a Circular Pocket.<br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcrE2UZndI/AAAAAAAAABo/pqKoSxkPU1A/s1600-h/cirpoc.jpg"><img style="MARGIN: 0pt 10px 10px 0pt; WIDTH: 217px; FLOAT: left; HEIGHT: 206px; CURSOR: pointer" id="BLOGGER_PHOTO_ID_5298250848925228498" border="0" alt="" src="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcrE2UZndI/AAAAAAAAABo/pqKoSxkPU1A/s320/cirpoc.jpg" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Using the Gcode from Pocketing program for the Center Circle.<br />Next Operation Cut the Outside Profile<br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcsrziFfaI/AAAAAAAAABw/EQKO2-LvPmg/s1600-h/polyline.jpg"><img style="MARGIN: 0pt 10px 10px 0pt; WIDTH: 358px; FLOAT: left; HEIGHT: 268px; CURSOR: pointer" id="BLOGGER_PHOTO_ID_5298252617703849378" border="0" alt="" src="http://2.bp.blogspot.com/_ZUF2HqBN97E/SYcsrziFfaI/AAAAAAAAABw/EQKO2-LvPmg/s320/polyline.jpg" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Using these CAD commands, Pedit, Explode and Offset for the Next operation.<br />First CAD command is Pedit, this converts Lines and Arcs to a Polyline.<br />The reason to use Polyline, is its easier to offset the part for the cutter used.<br />The Inner square is the part and Outer is the Tool path offset, by half the cutter diameter used.<br />The short line on the Tool path is the lead in/out for the cutter's start point.<br />Can be added to any point on the Polyline you want, by Exploding the drawing.<br />Then using Pedit to convert back to a Polyline for the finished profile.<br />The DXF file conversion program now knows where to start an end the cut.<br />Taking all the gcode files and using Windows Notepad program.<br />Doing a little Cut and Paste a complete Gcode program can be created.<br />Then run in Mach 3 Mill, to verify there are no mistakes.<br /><br />Click on the Links<br /><a href="http://www.cad2gcode.com/">DXF conversion programs</a><br /><a href="http://www.cad2gcode.com/cncprojects">CNC Projects</a><br /><a href="http://www.cad2gcode.com/pulley">4th Axis Timing Pulley Maker</a><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8995851056687128325-1066384726912467767?l=cad2cnc.blogspot.com' alt='' /></div>CAD2Gcodehttp://www.blogger.com/profile/14873995996854582091noreply@blogger.com0