Hi, ive got a thiel 158 tollroom mill. Ive seen this kit http://www.rhonmac-cnc.co.uk/index.htm and woundered if the one with the 5.8nm steppers would be enough to power it geared down 2:1, but dont quite understand about the driver, as it appears to me that it can run 4.2 amp but the motor takes 7?

Thanks