stepper blocked

[Guy69]

Hi there
For my first stepper based application ( a coil winder) I bought a very strong new stepper (86HY62DE04, 4.5amps per phase, 8 wires).
I use it with Unipolar mode.
When trying it "manually" (ie connecting coils by touching wires, no electronic switching), I can generally make it work normally: I am able to drive the motor ClockWise or AntiClockWise, BUT sometimes, for unknown reason, the motor seems blocked: I have to manually rotate the axis on another position in order to have it operate again.
Any idea? Is it becase of my "manual' conenections, which obviously lack cleanness: with 4 amps, there is a nice sparkle and connection is proably not instantaneous?
Or is my motor damaged :-( ?
Many thanks for your help
Guy

[smokieborde]

stepers dont run that way
i bought a small kit vrty reasonable followed directions
and it will run 1 steper
sometimes they even include the motor
go to yahoo or google and do search your searching
the info is out there

[erase42]

im sure its your method, and not the motor. Ive heard of people pulsing a motor driver manually, but never actually pulsing the motor directly. its a very complex pattern to try to do manually. That is what IC chips are for.

[Guy69]

ok,many thanks!!
I knew my method was crazy (but was just for testing, never intended to keep it that way
Guy