I am in the process of adding some limit switches to a CNC3018. It can be done without any adapters. For the Y axis I used some 3/4 inch 4-40 screws. The screw head goes through a washer that is cut flat on one side, so it can fit in the T slot groove. Then a large bolt goes into the slot of the platform. Something square would make the switch levers hit more evenly. I might make something out of aluminum for that purpose.
This is the completed, front Y axis switch with a aluminum square block on the bolt.
|CNC 3018 Pro Y Limit Switch|
This is the Z axis limit switch. It is required as the Z axis is tested first.
This is how a major website shows to wire the CNC 3018 PRO. This is TOTALLY wrong! The platform will crash when it tries to go back because the wires and wire ties are in the way..
This is how I wired the Z axis. This works quite well and allows the cable to move freely.
|CNC 3018 Pro Z axis Wiring|
I improved the wiring harness and the X axis limit switches. The wiring harness now looks like, and could be, one continuous piece.
|CNC 3018 Pro Wiring|
The new X axis limit switches are micro switches like the one I used for the Z axis. The biggest problem with these switches is that a 4-40 screw is too big. You need a 2-56 screw. I found some screws that came with servos for use with the servo horns.
|CNC 3018 Pro X and Z limit switches|
The problem was calibrating the driver voltage/current. With a voltmeter on ground and on the center of the trimmer adjust for .7 to .8 volts. That results in 1.4 to 1.6 amps to the coils and much cooler drivers. If you do not have a voltmeter and are using 8825 drivers set the trimmers to match this picture or to about 25 degrees to the right of straight up.
This is a picture zoomed in on the trimmers.
After going to "home" set the Z axis down to the surface and then set the X, Y and Z to "0".
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