OK, I found the data sheets on the chip and I also found a couple of app notes, which helped a bit, now I need some translation of the EMC tags please
Step Time: I assume this means the pulse width from rising edge to falling edge? Step Space: I assume this is the smallest spacing between pulses that should be sent? Direction Hold: I assume that this is the amount of time the direction signal has to stay high to make the direction change? Direction Setup: I have no idea what this is. On Thu, Nov 19, 2009 at 5:12 PM, Gene Heskett <gene.hesk...@gmail.com>wrote: > On Thursday 19 November 2009, Chris Knowlton wrote: > >> 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. > > The Toshiba document is very complete, although they use some less than > obvious names for some of the signals, there is enough there to design a > pretty complete driver. And with 5 volts more headroom, and an amp more > ability than the Allegro A-3977, it looks like a slight step up in power, > plus the 16 step micro stepping will smooth it up a wee bit. Interesting > chip, but would prefer the flat pack and a glued on heat sink. No idea > which > is in yours though and you are pretty well fixed by their choice. In > either > event, the more heat sink and fans, the better off you are. > > >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 > > > > > -- > 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> > > CONGRATULATIONS! Now should I make thinly veiled comments about > DIGNITY, self-esteem and finding TRUE FUN in your RIGHT VENTRICLE?? > > > ------------------------------------------------------------------------------ > 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
