> selection because I haven't a clue what to set them to. > > The L297-298 chipset doesn't to my knowledge do any microstepping, perhaps > that is your problem? > > > I am using the default motor timings from the L297 default <--- Comprehension DAWNS! These settings have to do ONLY with the board! Not the motors! Now I need some timing data on the board. The user manual was rather interestingly brief. It does tell me though that these are Toshiba TB6560AHQ chips. Perhaps I should grab the data sheet on them. There are buffers on this board, though I have them set to the fastest setting they have.
I kinda need to make this work with this board if I can. Most of the really nice parts in this build were scrounged. I don't have $350 for another controller and this one was $90. But that conflicts with the 'aerospace' driver you mentioned above, and which > I am not familiar with. Does it use this chipset? I tried to use them > early > on, but found they simply were not fast enough at switching, and the > predictable result was converting a couple of them to slag, at which point > I > threw money at the problem and bought a Xylotex 3 axis kit. I've since > bought a 4 axis too. Quite good drivers in this size range, for either the > 262oz motors or the 425's. > > Generally, microstepping improves the torque, but at low speeds its by > percentage points, not magnitudes. I actually lose torque at 1/4 step > compared to 1/8 step. At midrange speeds, where the motors are still > 'stepping' a step, then stopping till the next step, they will vibrate > about > the current step position, and at some speeds, this can actually cause the > motor to forget which way its turning, or simply get confused and stall. > An > additional weight in the form of a flywheel with loose parts on the other > end > of the motor to absorb this vibration can easily extend the speed range to > 2 > or 3 times the original, un-damped stall speed. This is very important for > full and half step lashups, somewhat less so at 1/4 step, and better yet at > 1/8th. And I presume even better at 1/16th steps but mine quits at 8 > microsteps. > > Ack! Learning curve wipeout. What is a lashup? I know about dampeners and I can probably get ahold of some brass and latex ones for the X and Y axis because I only have two motors that have through shafts I think. >Leadscrews are 2 start 16tpi (so effective 8tpi?) for the two axes that I > >have working now. > > > >Thanks for your attention! > > > >ChrisK > > -- > 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) > The NRA is offering FREE Associate memberships to anyone who wants them. > <https://www.nrahq.org/nrabonus/accept-membership.asp> > > "Well, it don't make the sun shine, but at least it don't deepen the shit." > -- Straiter Empy, in _Riddley_Walker_ by Russell Hoban > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
