How to Install Limit Switches in a Milling Machine

Milling machines are large machine shop tools used to machine large pieces of metal or wood. A limit switch on a milling machine acts as a cut-off switch if the machine either overheats or exceeds normal position. Limit switches are typically installed on the front panel of most milling machines. If the limit switch shorts out or goes bad, the milling machine may possibly perform functions which could be considered unsafe for the operator. Installation of a new switch takes less than an hour.

Phillips screwdriver
Soldering
Damp rag or sponge
Needle-nose pliers
Replacement limit switch
Solder

Instructions

- 1
  Unplug the milling machine from the wall.
- 2
  Take off the front panel of the milling machine by removing the retaining screws at each corner of the front panel with a Phillips screwdriver.
- 3
  Heat up the soldering iron. Melt the old solder joints by touching the tip to it and wiping the old solder up with a damp rag or sponge.
- 4
  Pull out the old limit switch with a pair of needle-nose pliers.
- 5
  Connect the new limit switch wires to the connectors on the milling machine and then solder them together with the solder.
- 6
  Replace the milling machine front panel and the retaining screws.
- 7
  Plug the milling machine back into the electrical socket.

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