On 3/1/2014 4:52 AM, Steve Blackmore wrote: > On Fri, 28 Feb 2014 16:31:43 -0800, you wrote: > >> On 02/28/2014 04:10 PM, Steve Blackmore wrote: >> ... snip >>> There is virtually no limits to program lengths since tape died so >>> writing subs isn't necessary to save space and serves no other purpose >>> other than living in the 80's (or earlier :) >>> >>> >>> Steve Blackmore >> I tend to agree. I have the loops in the g-code generator and >> automatically get ... (see below) > Looks very similar to CAM produced code. > > As time is generally the most important thing to a commercial company, > most CNC operations are done on a tool ordered system. There are other > considerations like distance or operation based processing or a > combination. Tool changes generally waste most time. > > Usually the CAM system will pick and do all the roughing first with the > biggest rougher it can use on the majority of the job. It may then do a > tool change to a smaller rougher to get to the finish allowance size on > all the job. Then do the finish passes finally drill or finish any > holes. > > Very simplified as all sorts of calculations will go on in a good CAM > system to select the most efficient way of doing the job. > > For example - I do a lot of pick guards for guitars on the router. > > 1st op - 3mm drill - drill all screw holes > 2nd op - .05 mill - cut outlines of pockets and larger holes > 3rd op - .05 mill - cut any other straight sided outlines > 4th op - 45 deg chamfer bit - countersink screw holes and cut remainder > of outline. > > It takes longer to do one manual tool change than all the machining on > one pick guard :) > > Steve Blackmore > -- > What control are you running your router with? It is not LinuxCNC or Mach3, correct? Are you happy with it?
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