http://www.todaysmachiningworld.com/forum/topic/hex-stock-has-twist-in-bar-when-milling-slot-on-citizen Brought to you by Todays Machining World en-US Thu, 09 Feb 2012 03:01:09 +0000 http://bbpress.org/?v=1.0.2 q http://www.todaysmachiningworld.com/forum/search.php http://www.todaysmachiningworld.com/forum/topic/hex-stock-has-twist-in-bar-when-milling-slot-on-citizen#post-75 Fri, 13 Feb 2009 03:17:10 +0000 Anonymous 75@http://www.todaysmachiningworld.com/forum/ <p>Slick! You work in Allendale ? </p> http://www.todaysmachiningworld.com/forum/topic/hex-stock-has-twist-in-bar-when-milling-slot-on-citizen#post-34 Wed, 11 Feb 2009 05:56:41 +0000 Anonymous 34@http://www.todaysmachiningworld.com/forum/ <p>All of the Mitsubishi M635/M700 controlled Citizen-Cincom machines come standard with a torque sensing feature “G160”, that can be used for many interesting applications such as yours. We helped a customer a while back with the exact same problem as yours. The following is what we did. </p> <p>To be quick and simple for the customer, we installed a .187 ball nose endmill in an unused live tooling station. We then programmed the tool as a probe and touched it to one side of the hex, recording the position it touched (Fig-1). We then touched the other side of the hex the same way (Fig-2). With two points known, we did a macro calculation to figure the amount of error (Fig-3), and then positioned the C axis to that value. This process only added about 3 seconds to the cycle time.</p> <p>See the program example below…</p> <p>M5<br /> T800(BALL-MILL-USED-AS-PIN)<br /> M18C0 (C axis to zero)<br /> G50W-.5905<br /> G98G0X1.3Z2.T8<br /> Y.35(a Y position good for checking)<br /> G0X1.<br /> G160Q30.X.7F10. (check Y+ side When X axis reached 30% of load stop)<br /> #100=#5041 (record the X value on the Y+ side)<br /> G0X1.<br /> IF[#5041GT.75]GOTO10<br /> #3000=1(---ERROR -CHECK PART ROTATION)</p> <p>N10(CHECK-2ND-SIDE)<br /> Y-.35(same as above but negative)<br /> G0X1.<br /> G160Q30.X.7F10. (check Y- side When X axis reached 30% of load stop)<br /> #101=#5041 (record the X value on the Y- side)<br /> G0X1.<br /> IF[#5041GT.75]GOTO20<br /> #3000=1(---ERROR -CHECK PART ROTATION IS TOO BIG)</p> <p>N20(DO-CALC)<br /> #102=[#100-#101]/2<br /> #103=ATAN[#102/.35] (Find the rotation error)<br /> G0H-#103 (re-position the C axis incrementally)<br /> G0X1.3T0<br /> G50W.5906</p> <p>Here are a few other applications you can use the “G160” for:</p> <p>- To check if a cross drill or face drill was broken.<br /> - To find the location of special extruded stock with a special multi-shaped ID.<br /> - Often it’s used to check the collet pressure on the main- or sub-spindle to confirm clamping pressure before heavy drilling/turning.<br /> - You can even use it for in-process gauging to set and check offsets while running.</p> <p>Good luck with your problem. If you can follow these instructions these twisting problems should get under control. </p> http://www.todaysmachiningworld.com/forum/topic/hex-stock-has-twist-in-bar-when-milling-slot-on-citizen#post-33 Wed, 11 Feb 2009 05:55:57 +0000 Anonymous 33@http://www.todaysmachiningworld.com/forum/ <p>I’m milling a slot along the length of the part on .875 aluminum hex parts with a Mitsubishi M635 controlled Citizen-Cincom C32. In the process, my hex stock sometimes has a large twist in the bar, resulting in up to 8 degrees of rotational error from the hex flat to the milled slot. What can I do to get rid of this error? </p>