I am planning to add some limit/home switches to my CNC mill.
Sherline mill, Gecko 540, EMC2 controller...
Any specific comments about adding switches to a Sherline? How you you keep the Y axis switch clean? How do you mount the Z axis?
Any general comments about switches?
What is the current state of the art in limit/home switches? Does everyone still use mechanical microswitches or have people moved on to optical things or maybe hall effect sensors and little magnets covered in swarf (Err, forget I suggested hall sensors and magnets)
What kind of repeatability do you guys measure off your home switches? I'm guessing hundredths but maybe it's better or worse? I'm guessing repeatability is controlled half by the switch mounting and the other half by the quality of the switch?
Is the market for switches primarily controlled by repeatability or by durability or by water/coolant proofing or oil proofing or chip proofing? In comparison, the market for steppers is pretty much controlled by torque, for a given NEMA size and shaft diameter.
Have lots of problems with chips wedging into your home switches?
Just check out the "mouser.com" phone book sized catalog on my desk and look for microswitches, or are there "special machinist suppliers" whom sell "special switches"? I'm guessing I can just stroll thru mouser.com?
For all things in life there is a minimum price below which you are wasting money on junk and above a different price you are making a middleman rich. What are typical high and low prices for limit switches? I'm guessing for the price of one stepper I should be able to handily outfit my entire mill with switches?
Is this the kind of thing I will be replacing often like an endmill or something thats good for the life of the machine (barring accidents) like a power switch? I'm guessing they last forever if they're coolant and oil proof?