Chris Underhill

I'm having some issues with a NEMA 14, DRV8825 build. Basically the motor just judders, unless i turn the motor delay down to 1000 - in which case it turns smoothly, but not always in the same direction! I've got another setup with a NEMA17 PG27, which works flawlessly so im a bit stumped as to why I can't get the NEMA14 to work!! Am i missing something simple? Grateful for any input!! Thanks