Hello and a big thanks for all the help and ideas ive gotten from this forum the last few weeks.  This is my first post so bear with me.  I would like to share what i consider a major breakthrough in motor tuning within Mach 3 for my system (homemade 3 axis router) controlled by the growing in sales and maybe popularity, Toshiba TB6560 chip board sold on ebay....   
I was having a horrible time with the motor tuning issues, tried everything, blah blah....    then i came across an excerpt from the Mach 3 manual saying something like ~ "the steps per unit control is NOT intended to be a tuning mechanism, if your calculated values do not work, youve done something wrong."  Now i had been trying to tune in 1/8 microstepping mode on my board (or so i thought) but the steps per unit was needing to be set atleast TWICE AS HIGH as my calculated values ~ very frustraing!!!   As a last shot i tried switching to 1/16 microstepping mode just for kicks and much to my surprise, the steps per unit value came in EXACTLY as i had calculated for 1/8 step micro!!!!   
Therefore, i am trying to say, i think the chinese boards have the DIP switch positions for 1/8 & 1/16 micro BACKWARDS!!!!!
Anyone else having the same troubles i had, please take a few minutes and give it a try & please post back as i would like to pass this on to the ebay seller i got the board from because, unlike some on ebay, this seller is very good and seems to care deeply about his customers....     
Thanks much to all, Bill

Glad you found the issue, I had a similar kind of thing with the stepper drives I used on one project, the dip switches to choose between Ste/Dir and CW/CCW modes were backwards.
Hood

I think you are on to something. I have the same board. I thought I was too amatuer or crazy but- my x and y axis are switched. Maybe there is a quality control prblem with these boards.

Thanks for commenting, I have gotten to the point where i know products like the geckos, etc...  are far superior, but way out of my budget, so this is the best practical alternative that i can figure.   So, we combine our efforts and make the chinese junk work for us!   hahahaa