The entire point of GD&T, after all, is to relay to the machinist or welder or casting plant or whomever which tolerances are important for part function, and which aren't. RE: Effect of modelling method in CAD on CAMĪs a blanket statement I would disagree with this- although in some particular situations it may not matter, on complicated parts, as designers we can directly effect project lead times and budgets by making smart design choices that don't effect function but DO effect machine time required to produce a part. Then there is always 100's of knowledgeable (and opinionated) people with lots of experience about this stuff on sites PracticalMachinist and CNCZone. For newbie CNC programmers like me, I found it very useful. Somewhere on the HSMWorks site / Autodesk site you can find a web-based version of something called CNCBOOK.
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And if my info is correct, they offer a free HSMWorksExpress version covering 2-1/2D CNC. I/we like it because ease of use, integration with SW, and is designed so that a simple mouseover of the commands pops up a very good explanatory note. It is now an Autodesk product so is also ported to Inventor. Many sources for online learning of G-Code, dig around and you'll find them.įor a CAM system, the Uni I'm with standardized on HSMWorks because it is cleanly integrated with SolidWorks. The skill of the programmer / machine operator helps when they set up the NC machine, too. Modern CAM systems provide automatic offset values to accommodate tool wear, stock allowances, etc. Should it be exactly modelled in the same way it's going to be machined ?Generally YES as you should model your net shape requirements. Pembroke Pines, FL, USA RE: Effect of modelling method in CAD on CAM tygerdawg (Mechanical) 15 May 16 16:36 They are great learning tools for what you seem to want to do.
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Many CNC machines come with software simulators that you can install on a PC. That assumes you are using a fairly elemental machine control some of the newer ones allow you to do CAD right at the panel, but unless the part is simple, that's probably not a good use of your time, or the machine's time. The corresponding G-code file typically describes the cutter centerline path to produce that part, which of course assumes that the exact cutter to be used has been selected already, and the G-code file will require adjustment if the cutter size is to be changed. I.e., the CAD output file, typically a DXF file, describes the generated part. Just get the geometry of the generated part right. Yes, you want to avoid things like sharp internal corners, but in general the CAD operator should not worry about what the machinist or the CAM operator is going to do. If you are designing a part in CAD, just design the part you want. It's the sort of grinding stupid labor at which computers excel, i.e., it's boring, repetitive and not fun for more than half an hour. AutoCAD does not natively understand G-codes, but it understands lines and arcs.
I have checked G-code sequences by manually generating the cutter path in AutoCAD, from the G-code file, in 3D.