On Fri, Mar 26, 2010 at 07:24:21PM -0700, Chris Reynolds wrote: > what's happening is that my cuts aren't coming out perfectly round. > Any suggestions?
I think very few machines can make a good round circular pocket with an end mill. If the ballscrews, lube, gibs, (and if servos, tuning) are not perfect you will always get some artifact at the reversal points, no matter your backlash setting. There is no doubt that backlash compensation is useful for things like getting spot drills in the right place, but for all the reasons others have given, it can't fix everything. For many circular pockets it really doesn't matter, but if you want to press fit a bearing, you need it pretty round. If you need a very round hole from an imperfect machine, you just have to use a boring head. Do the helical or circular milling first to rough out the hole, leaving as little as possible for the boring head to take off while being sure it will cut all around, and do a feed in/feed out bore cycle like G85. I do this in Aluminum and I like to use one tooth of a HSS end mill as a boring bar. You'll have to test your program a few times in scrap to get the boring head diameter set right, but after that you'll be set and you can make properly-sized very round holes. Chris ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
