b'\x1b\x1a\x19 \x1f\x18\x1d\x17\x16Machinists CornerCRASH AVOIDANCE WITHOUT SIMULATIONBy Brandt Taylor Here, Ill discuss how to preventthat will run safely and produce cor-crashes on a three-axis CNC millingrect parts. The procedure involves T he introduction of CNC machinemachine. This could be a Bridge- using a machine tool to verify the part tools changed the machine shopport-type machine, a lathe, a bedprogram. This starts with program-world. Productivity is way up, andmill or a machining center. ming. A shop should have a standard shops can produce parts and partThe first step in solving a prob- procedure for determining the z-axis features that were out of the questionlem is to define it. A crash is when azero position with regard to the work-in the past. But unlike most machinecutting tool contacts a solid objectpiece and a standard positive z di-operators, if you tell a CNC machinewhile a machine does a rapid movemension for a clearance plane.to kill itself, it will. So in program- (G0 in G code). For the three-axisRapid (G0) moves in the x, y plane ming language, G0Z-0.500 is goodmilling machine were using, theshould be done at the clearance for a move, but G0Z-5.00 can breakG code is generated with or with- plane or above it. When clamping a something. To paraphrase Benja- out the aid of a CAM program, andpart with a vise, set the z zero at or min Franklin, breakage prevented isthere is no simulation software avail- above the vise jaws. Confusion can money earned, so lets use low-costable to debug the code. lead to trouble, and having stan-methods to raise the bottom line. Good shop practices deliver codedard procedures reduces confusion. Introducing the Neo Roughing LaserAchieve Greater Processing Rates for PCD Production Up to 60% overall processing reduction times Fast and easy processing of superhard materials Low operating costs and space saving footprint Integrate with standard finishing equipment for greater overall efficiencyFind out more at agathon.chSee us at IMTS Booth #236823AGATHON Machine Tools, Inc | 9 Parklawn Drive | Bethel, CT 06801Tel: 203-730-8741 | [email protected] | www.agathon.ch16MARCH 2020MachininstCorner.indd 16 2/14/20 12:07 PM'