Hi Rob, The computer is plenty fast enough. This is a physics problem, something like possibility #3.
If my memory serves correctly, EMC will try to make every little corner to within 0.001mm unless you tell it not to. Try adding this to the top of the program: G64 P0.01 This tells EMC it's allowed to round off the corners a little bit. P is the tolerance value, though it might actually be out of spec by twice the P value, since long stretches of tiny segments get glommed together if they move out of line by less than P. -fenn On Fri, 8 Feb 2008, Rob Jansen wrote: > My machine is set to to amax. speed of 4800 mm/min (~ 190 inch/min) and > an acceleration of 9600 mm/min. > But somehow, during milling I reach only speeds of up to 600 mm/min when > doing small steps in the program. > > The thing is controlled with an older PC I still had standing in a > corner - don't know the exact specs but it is a 1.4 GHz AMD / 786 MB > SDRAM and a simple VGA card using stepper motor control through the > printer port. > > The G-code is created using DeskProto an contains a lot of small steps > like this: > >> F2000.0 G1 Y26.1111 Z-7.6255 >> F2000.0 G1 Y26.3333 Z-7.5962 >> F2000.0 G1 Y26.5556 Z-7.5686 >> F2000.0 G1 Y26.7778 Z-7.5429 > I see three possible causes for the low speed reached during milling > this (larger steps are going faster): > > 1. the PC is too slow (there is a fairly high CPU load of about 80% > 2. the G-code is not optimal: all the "F2000.0 G1" sequences are not > needed and just take up valuable time > 3. EMC is deaccelerating after each step before proceeding with the > next one. > > Is anyone using DeskProto with these kinds of speeds ? > and what kind of PC and/or DeskProto settings are you using ? > > What is the best thing to try first: create a simple C-program to > optimize the G-code or should I just go to the shop for a new PC? > Any suggestions on processor type and/or memory, what is the speed > difference between Core2 Duo and Quad or the newer AMD cores? > > I am new to EMC so any help in configuring and building a decent system > is appreciated. > > Regards, > > Rob ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
