Need Help!- Motor missing steps then reversing ???

[TOTALLYRC]

If I read all of your stuff properly, You are running the motors at 36 volt and the power supply puts out 8.8 amps.
I would put a volt meter on the power supply terminal and run the machine. If the voltages stays near the no load condition because it is a regulated power supply it should be good. Make sure that you run a program that moves all three axis' at the same time to put the most load on the PS.
Those motors are rated for a max of 60V so they may not go as fast as you would like.

I am learning the hard way about matching motors, drivers and power supplies.
I am not sure, but if the drives do not have mid range compensation you may not be able to go much faster without doing something about it. You could always add mass dampners. Search the zone. There are several post about this problem especially with the xylotex board.

Begining of rant
I am not bashing anybody or there product. I however feel that if a manufacturer is going to offer kits, they should put out products that are matched to each other.

As an example what I mean is if the kit has a 40v power supply and 40v 3.0 amp max drivers, wouldn't you expect that the motors would also be 40v and 3.0 amp motors and or at least close?
On the low end tell people up front that you will not get the performance that a more expensive setup will give and why.

I think it would be a great service for many of the suppliers to put the max voltage on their motor pages instead of holding torque which is almost meaningless. Not too many of us machine at zero speed. To machine something at least 1 axis has to move and if you are doing aluminum this is going to be at a fairly fast speed where the holding torque of the motor has no meaning. Also as the higher holding torque motors have their torque drop off faster as the speed increases, just tell the people up front what they really need as opposed to what is cheap.

I think that there is enough data out there to be able to tell a customer that if he uses kit "a" on machine "x" he will get about speed in ipm "y" and be honest about it.

This policy may hurt in the short term but it will payoff in the long term.
End of rant