Let the fun begin !!! ???

[PAULRO]

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

[JAZZCNC]

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.

That's the point you don't need a safety relay at all. You just need standard relay/s wired such that they create a latch and drops the latch if an E-stop occurs. Latch can only be reset via momentary button after fault is cleared. Very easily done and costs very little.

[Clive S]

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.

Paulro I think what you are referring to is the bolt that holds the toroidal transformer through the centre to the chassis. What you must not do is connect an earth wire to the end of the bolt that is not touching the chassis. The reason of this is that it will give you a shorted turn on the transformer by connecting the bolt from the two ends to the same point ie earth. ..Clive

[PAULRO]

so i have a coil with 2 insulating rubber pads ( 1 per side of the coil) a steel dish washer to sit on top of 1 rubber pad and a bolt to secure the whole lot through the disc on to a metal plate that will be earthed anyway. so the steel disc will be earthed through the frame and if i put another earth at the top i'm creating a shorted turn. Standard Range Toroidal Transformers- CM0750225- 750VA 230v to 2x25v that is good to know , i've been searching the forum for a thread that explained the construction but couldn't find it . by the way is my understanding of how the coil is assembled correct or am i assuming the assembly incorrectly?

[njhussey]

http://www.mycncuk.com/threads/8421-...6783#post66783

There's a diagram of the power supply....there are a few posts on the forum where people have put links to the actual items that they have used...I'll be looking for them myself again soon!

[EddyCurrent]

Here's a picture of how mine looks, the bridge rectifier is under those wires between the terminals and the capacitor.


And here's a typical latch circuit

[PAULRO]

thanks guys i'm about to put the first elec dwg. together and when it's finished you might critique it and let me know

[Clive S]

Here's a picture of how mine looks, the bridge rectifier is under those wires between the terminals and the capacitor.

Nice pic. Eddy but I only see one cap!! How big is it ..Clive

[EddyCurrent]

Nice pic. Eddy but I only see one cap!! How big is it ..Clive

22000uF 100v