Originally Posted by MechanoMan  Allegro used a very large minimum Ton-min time in all its products, including SLA7078. |
Is that the 1.7uS spec? I assume you're not fond of the National LMD18245 either then?
Thanks for your comments on the steppers. I searched, but wasn't able to locate the exact article. I did find other mention of the "point of diminishing returns" being in the 140-160 range, but the material is dated. Maybe the one I remember was older as well.
Incidentally, I can appreciate your position regarding the engineering and performance of the Gecko drives. However, it is the purpose of engineering to solve problems. If those problems are relatively minor in terms of accomplishing the work, the additional engineering cost may not be justified. I believe that's the case regarding the Gecko controllers, at least from the perspective of a hobbyist. Searching the 'Net, I find a number of HobbyCNC users who seem entirely satisfied with their results. Also, I'm on the fence regarding resonance solutions, insofar as it may be possible to dampen it mechanically rather than electrically. Neither method is a perfect solution, but mechanical dampening appears to be an inexpensive add-on, particularly if one also has access to a lathe. In the end, this is all a matter of matching the cost to the job at hand, and to do that in a way that compliments both my DIY skills and the goals I've set for my projects.
Thanks again for your well-considered (and informative) comments on these issues.