On Saturday 09 November 2013 10:11:49 Marius Liebenberg did opine: > I don't think it will help as the problem is acceleration over distance. > I.E. Distance of move to short to reach max feed rate.
The other problem no one has mentioned is that his LCNC machine is old & slow, however the OP did not mention the base_thread times from his ini file. Or his microstep ratios if he is using steppers. I ran into this while exploring the merits of running my 2M542 drivers at higher microstep ratio's. The atom board, running a base_thread of 23 microseconds, is simply incapable to issuing enough steps per second to be able to hit the motors maximum speed capability when the microstep divisor is more than 8. At 8, and a 2/1 gear between the 425 and the Z screw, I can move Z on the lathe at 60ipm. At 8, its noisy, I think because I may not be on the sweet spot for motor currants so the thou or so gear lash in the 2/1 takes a beating despite the damper on the motor. Some day I may convert it to belt drive just because of that. At 16, it drops to 30ipm regardless of what else I set in the ini file, the 23 u-sec base_thread cycle is tapped out and can't issue the steps fast enough. So my question to the OP is: What is your base_thread period, and your microstep rate? > On 2013/11/09 01:47 PM, Belli Button wrote: > > I think LCNC can only execute one Gcode per servo cycle. Does it help > > to reduce your servo cycle time? > > > > > > > > -----Original Message----- > > From: aaron moore [mailto:aaronmo...@linuxmail.org] > > Sent: 09 November 2013 12:58 PM > > To: EMC userslist > > Subject: [Emc-users] (no subject) > > > > Hi > > I am trying to get my head around running a rotary axis on top of a 3 > > axis router, but I am having problems; > > > > The main one is low feed speed. I have tried editing the code and > > increasing feed and acceleration in the ini file to increase the > > speed, but in makes no difference. I am trying to cut a helical final > > cut, which seems to have lots of tiny moves, but other files I have > > tried are almost as slow. Can any one offer some advice? The computer > > I run Lcnc on is very old an slow, does that have any bearing? > > Thanx in advance > > Aaron > > > > Re-Form Furniture > > Aaron Moore > > Conileigh > > Skinners Bottom > > Redruth > > Cornwall > > TR16 5DY > > > > Tel: 01209 890084 > > Mob: 07805686188 > > Email:aaronmo...@linuxmail.org > > Web: www.re-formfurniture.co.uk > > ---------------------------------------------------------------------- > > ------ -- > > November Webinars for C, C++, Fortran Developers Accelerate > > application performance with scalable programming models. Explore > > techniques for threading, error checking, porting, and tuning. Get > > the most from the latest Intel processors and coprocessors. See > > abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg. > > clktrk _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > ---------------------------------------------------------------------- > > -------- November Webinars for C, C++, Fortran Developers > > Accelerate application performance with scalable programming models. > > Explore techniques for threading, error checking, porting, and > > tuning. Get the most from the latest Intel processors and > > coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg. > > clktrk _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) BOFH excuse #34: (l)user error A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
