On 06/15/2013 12:04 PM, Charles Buckley wrote: > you could treat the spool feed as an > additional axis whose feed rate is the same as the 4th axis.
I think that would come heartbreakingly close to working, because the feed rate depends so much on the effective diameter of the gear/pulley/wheel. A teeny difference in hobbing will eventually (i.e., over the course of a dozen hours) cause the filament loop to either vanish or spill off the table: gotta wrap some feedback around the filament coming off the spool. But it might be close enough. Do a coarse positioning at the start of the print to put "enough" filament in the loop, then run the two motors in parallel for a few hours without feedback. That would eliminate the need to keep track of the filament while it flops around, which sound like a Good Thing. > measuring the table temp for a heated table bed would also be good. The TC4 board also has four thermistor inputs... and I now have some 25 A DC-DC SSRs on hand. [grin] -- Ed softsolder.com ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
