home switches

[chevdrgtrk]

I am currently installing a cnc retrofit on my bridgeport, and was wondering where the correct location for the home switches would be (ex: 2 inches from the bottom of Z.....etc) I know I can put them prettymuch anywhere I want, but where is the typical location?

[Al_The_Man]

As to the Z Generally as far up as possible just before the up Over travel.
Also If the system allows auto 3 axis homing, I do it in sequence, first the Z and then the X-Y.
Al.

[chevdrgtrk]

ok, but what about the other 2 axis? home right or left......... and in or out?

[wcarrothers1]

x table would move to right

Y table would move away

to get to home possition. Or in other words if a part was clamped down it woulc be going to the lower and to the left side of the piece as far as possiable.

Home for Z is all the way up. travels neg going down and you zero it manually to the top of what ever you are cutting before you cut.

And like said. Wire in series that way you don't have to have a separate input for each axis (and same for limit).. Also wire so they are normaly closed so if a wire breaks you get a limit signal (and also like I said you could wire in a loop and save inputs (by what was said earler home Z till circuit opens then it moves off till it recloses and is home, then home X till circuit open then move back closed again then Y till open and move back till closed.

b.

[chevdrgtrk]

ok, I was a little confused the other day about the z being all the way up......but then it dawned on me, most people are running there quill, I am running the knee......so that would be almost all the way down for me.......I have run a cnc lathe before, but have never had experience on a mill........actually never seen a mill "home" before. I am running mach 3, and well, lets just say I have some playing around with it to get it all figured out, but before I do all of that, I have to get the servos, and switches mounted first. Thanks everyone.