Need pictures of mounting limit switches on Bridgeport mill

[cnc_4_me]

Hi, could some of you post some pictures of how you mounted limit switches on a manual Bridgeport to CNC conversion for the X, Y, and Z axies. I will be using the knee for the Z axies.


Thank you

cnc_4_me

[cnc_4_me]

Still looking for pictures.

Thank you.

[cnc_4_me]

I am still looking.

Thank you.

[SCzEngrgGroup]

I could give you pictures of how mine are currently done, but I'd hate to send you down that road....
I'm in the process of making new optical limit switch assemblies, somewhat modeled after the Industrial Hobbies optical limits, with a number of "improvements". I don't have pictures yet, but I can describe what I'm doing. Hopefully this will make sense.
The switch housings each have two optos in them, one serves as both limit switches for the axis, the other as the home switch. The "flag" that triggers the optos is mounted to a 1/4" rod that passes completely through the housing, through O-ring sealed holes. The rod is spring-loaded to the center position of its travel, so it can be pushed either direction by "stops" mounted on the axis. The stops hit shaft collars locked to the shafts, allowing the limit positions to be changed by simply moving the shaft collars.
The Z axis switch will be mounted to the machine base, near the bottom on the RH side, just behind the knee ways. The shaft will run the length of the ways, and be held in place at the top by passing it through a nylon block also bolted to the base. This way, a single "stop" mounted on the knee can serve to activate both plus and minus limits.
The Y axis switch will be mounted on the underside of the saddle, with the rod extending a short distance out each side of the housing. Two stops will be mounted on the knee, one for each limit.
The X axis switch will be mounted on the front of the saddle, with the stops mounted to the front of the table.
All the limit and home switches are wired for fail-safe operation. That is, when no switches are tripped, all the optos are on, so that if an opto fails, a limit or home will be immediately triggered (With servos, you don't want to wait for a servo runaway to find out your limit switches have failed....). All the optos and limits are run at 12V, and combined on a custom board, to generate a single home signal, and a single limit signal to Mach. That board also controls the main power relay, so that if a limit is hit, power to the servo motors is immediately turned off. Re-powering, to jog off the limits, requires pressing and holding a momentary contact over-ride switch.
I'll post pictures once I get off my lazy butt and finish making them....

Regards,
Ray L.