5 ips is very slow for a lot of machines these days. I have seen some machines at a Chrysler transmission plant that has rapids so fast that you really can't tell what is going on when it is moving around between cutting operations.
They eek out another fraction of a minute in cycle time and that adds up to hours over a period of weeks and days over a period of a year. They aren't cutting anything at those speeds, just repositioning and changing tool bits etc. Dave On 6/18/2011 3:45 PM, gene heskett wrote: > On Saturday, June 18, 2011 03:27:25 PM Dave did opine: > > >> Yes, linear servo motors are amazingly expensive. If someone starts >> making reasonably priced linear servo motors I think they might be >> overwhelmed with demand. >> >> Unless you need really fast rapids, or extreme precision, I don't think >> they can be justified in most cases. >> >> The machine I setup before with Parker drives was scary fast. I was >> really concerned that if I screwed up the tuning that I might drive the >> carriage right off the end of the rails due to an impact. >> >> Ironically the machine runs very slowly, 5 inches per second is about >> it's top speed. But it is very reliable, they like that, so they >> associate the linear motors with being reliable. >> >> But for the price, those linear motors should be reliable! >> >> Dave >> >> > 5 IPS? My machine, wide open, can occasionally do .4 IPS without coming > undone. Even that is too fast to carve wood precisely at 2400 revs from > the main spindle. Bit forces when using the die grinder also restrict the > speed, so I get tenons, when carving then from the end& running about the > stick in a climb cut, cause the tenon to be several thou fatter at the root > that at the tip, and that is cutting a 1.35" long tenon in 5 stepdowns to > get to the root length. How much fatter depends on how sharp the bit is, > and I generally have to change the bit about every 75 such tenons, and > about 30 matching mortises, generally for the same reason, the bit is > dulling because of all the chip recutting despite having a vacumm rigged > keep the mortise clear. This is using Bosch router bits, but next time I > order, I note that Henley has longer bits that might stay put in the collet > better. Longer would also allow better access for the vacuum too. > > 5 IPS? Sheesh, you could paint car doors with a spray gun at that speed. > > [...] > > Cheers, gene > ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
