On 02/02/2014 07:45 PM, Gene Heskett wrote: > But the speed considerations involved in laying a consistent thickness > of material, are highly dependent on the speed and accels of a print > head that moves, and weighs perhaps a pound, often much less. Now, > translate that motion into the table of a conventional mill whose x > table probably weighs somewhere between 40 and 500 lbs. That level of > instant turnaround performance while laying a continuously flowing > layer of plastic, while also moving the y a large fraction of a bead > diameter while the head, the x axis, is turning around at the end of > its stroke with perhaps 50 thousandth of an inch to do all that while > not building up a fence of too much material at that turn around point > because the plastic keeps on flowing when the table is slowing to make > the direction turnaround, simply is not within the reach of even my > toy mill whose extended x table is likely close to 40 pounds. Now > imagine trying to do that on an 12 x 54, $47,000 cnc mill where its > table weighs perhaps 500 lbs. Common sense says it can't be done well > enough to sell the product without finish rework. Cheers, Gene
I've re-purposed 3-5 axis machines into 3D printers using inkjet printheads and UV cured photopolymers. Speed is the only major problem with them since they are designed around moving a cutting tool vs a non-contact adding tool. Resolution and accuracy is well beyond FDM. A dedicated multi-axis inkjet is much faster with accell/decell to 2G's and can travel over 2m/sec. FDM is a relatively slow additive process anyway (vs SLA, Inkjet etc) and the glue guns are far from precision gear pumps that can lay down themoplastics much more consistently. -Bari ------------------------------------------------------------------------------ Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
