Gentlemen, I am running the big brother of this card named SMC-1500 including a small piggy back board with some intelligence on it. As the name implies, it's capable of 1500 mA at 26 volts and this was always sufficient to drive my small milling machine making gear wheels. Furthermore, it can very well move all three axes at a time simultaneously. The manufacturer supplies drivers in C and Pascal that can be fitted in user programs, and a demo program which has been good enough to meet all my needs so far. I have fed it with home made PCB drilling files from EAGLE, tuned up with MS Excel to minimize idle ways. The drivers can drive any ramps up and down and interpolate 3-axis trajectories. Also, the board accepts step and direction pulses when I run it with EMC2. (So far, I only tried with stepgen test mode). I never bothered with current adjustments as I am using the maximum I can get all the time anyway.
The only problem is that speed is very limited to about 3.5 kHz max. which keeps the machine slow. So, after about 15 years of service, I am looking for a more modern board with a little more power (esp. in voltage). Thanks for the hints. Peter Blodow andy pugh schrieb: > On 7 August 2012 22:01, Alexander Grill <ale...@fet.at> wrote: > > >> Unfortunately I don't have a Step-Direction based card installed (I plan >> to build a new one based on TB6560 or A3977, but that is rather a long >> term goal). In the mean time, i want to use my old card (EMIS SMC-800), >> which cannot be driven directly by linuxcnc. >> > > >> http://www.produktinfo.conrad.com/datenblaetter/950000-974999/967599-an-01-en-SMC_800_Schrittmotor_Karte.pdf >> >> Signals are described on page 11. >> > > There has to be something wrong with that information, as it gives the > same bit pattern for 60% and 100% current. > > That can _almost_ be controlled by the Type 15 stepgen which lets you > supply a lookup table of your own. It ought to be fairly simple to > modify it to create 6 pins. (changes in lines stepgen.c 1211 and 1217 > to add more phases, 308 to add more steps, and you can recompile just > that file with comp (I think). > > However, the fact that you can only step one axis at a time looks a > lot more troublesome. I _might_ be possible to enable three stepgens > one at a time, and direct their output to the parport accordingly with > a bunch of AND gates (in HAL, i.e. software). That is probably easier > than writing a step generator component from scratch. > > To be honest, it all looks rather painful, and multi-axis stepper > boards are €45 delivered on eBay. http://www.ebay.at/itm/280819674945 > > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
