well i'm glad i held off with the purchase of the 60 VDC PSU. i must get a sketch of a psu organised and post it here. i remember reading a thread posted here about the grounding issues and potential for error if the power supply is grounded incorrectly . i think it was in relation to the main screw of the coil touching or not touching the base plate . i'll have to dig it out and give it a read again. the homing issue can be put to bed for the time being at least , i 'm clear in my mind following the info from you guys here. with regards to the safety relay i think i will leave it for now and get the baby to take its first step with a decent level of safety using the relays that i have . down the road i will tackle the safety relay when i get more familiar with the whole experience. as always guys ... the advice is first class, cheers