Homing switches & 'methods of working' (Mach3)

[ptjw7uk]

I have often wondered about the same thing as to my mind a homing switch should be in the middle of the travel and limit switches at the extremities. If a homing switch is in the middle then its construction will dictate how accurate the position will be depending which direction the position is reached from(if you get my drift! - no pun intended)
So far Ihavent fitted switches to my mill as I dont see how they are going to be that useful!

Peter

[HankMcSpank]

I have often wondered about the same thing as to my mind a homing switch should be in the middle of the travel and limit switches at the extremities. If a homing switch is in the middle then its construction will dictate how accurate the position will be depending which direction the position is reached from(if you get my drift! - no pun intended)
So far Ihavent fitted switches to my mill as I dont see how they are going to be that useful!

Peter

Hi Peter....there seems to be a problem with homing switches for the hobbyist - lots of sites tell you how to implement them (indeed it only took me about 45 mins from scratch to fit mine & get them working) & I can certainly see the *massive* win wrt pushing steppers too hard & them stalling, then losing your place - but there seems to be scant info about how such switches fit into the overall picture/workflow wrt using CNC machines!

I stumbled upon something via Google today that I need to investigate a little bit more - a possible 'offset' from the 'ref all home' position, which I can only assume means something along the lines of "after homing to a known point, go offset to position by Xx & Yy (ie the middle of your table) & then consider this to be 0,0. Something like that would make sense.

I'll update you if I suss this one out tonight!