Guest
Show Posts
1
General Mach Discussion / Limit switch issues
« on: December 25, 2015, 05:14:08 AM »
From the 1000's of threads here there may be an answer already, but after searching I have read all kinds of issues, but not one like mine....
7 years ago I purchased a POS machine from Thom Carr Company. At the time I knew how to operate a CNC, but not how to build one, or very much on how they actually operate. I've since learned a tremendous amount.
From the very first day I turned on the machine after connecting it to the computer, when homing, jogging, or during a program run, the limit switches didn't stop the various steppers from trying to drive the gantry into the netherworld.....I contacted the manufacturer and he poo pooed me and said they only work when homing...I thought at the time: well that doesn't make sense, that's like saying the brakes on your car will only work when it's in drive.....I should have listened to my gut.
I also asked about setting the home switches to the opposite end of the Y axis, he said "you don't want to do that"...why I asked? he never answered..."you just don't"....
Anyhow, I met a guy who also has a CNC and he came over to check out mine, I showed him the issue with the limit switches and he says "limit switches are supposed to stop the travel of the axis period..."
SO, here's my question:
how to correct this? lol......and is this true? that limit/homing switches are only designed to work when you hit the ref all home button? That when you jog, or run a program, they don't?
7 years ago I purchased a POS machine from Thom Carr Company. At the time I knew how to operate a CNC, but not how to build one, or very much on how they actually operate. I've since learned a tremendous amount.
From the very first day I turned on the machine after connecting it to the computer, when homing, jogging, or during a program run, the limit switches didn't stop the various steppers from trying to drive the gantry into the netherworld.....I contacted the manufacturer and he poo pooed me and said they only work when homing...I thought at the time: well that doesn't make sense, that's like saying the brakes on your car will only work when it's in drive.....I should have listened to my gut.
I also asked about setting the home switches to the opposite end of the Y axis, he said "you don't want to do that"...why I asked? he never answered..."you just don't"....
Anyhow, I met a guy who also has a CNC and he came over to check out mine, I showed him the issue with the limit switches and he says "limit switches are supposed to stop the travel of the axis period..."
SO, here's my question:
how to correct this? lol......and is this true? that limit/homing switches are only designed to work when you hit the ref all home button? That when you jog, or run a program, they don't?