machine screws, (2) M3 flat washers, (2) M3 split-
lock washers, and (2) M3 nuts. The Y axis switch
assembly will be built in the orientation shown in
the picture to the right. The X switch will have the
“L”
opposite. See the middle picture on the next
page for that switch orientation. Slide an M3 flat
washer on the screw, the put it through the plate
and the switch, then secure it with an M3 split-
lock washer and nut.
Now put an M5 “drop in T nut” into the L
eft Y Rail,
towards the Front Frame. Use an M5x12 screw to
install the plate onto the T nut, with a half inch
washer sandwiched between the V rail and the
Homing Switch Plate as shown. You will have the
head of the screw, an M5 washer, followed by the
Homing Switch Plate, the half inch washer, then
the T nut that is embedded into the V Rail. Slide
the bed back and forth a bit and make sure that
the M5 Nylock nut that is on the V wheel doesn’t
catch the head of the M3 screw on the Homing
Switch Plate. If it does, just loosen the Homing
Switch Plate from where you just tightened it to
the T nut and cant it clockwise a tiny bit (there is a
little wiggle room). You can easily get a millimeter
or so of clearance this way. See the picture to the
right.
It’s not shown in this pic,
but you MUST put an M5
washer between the head
of this M5x12 screw and
the switch plate or the
screw will bottom out and
you will never get the
plate tightened down
You’ll now
install the stud that engages this
switch in the remaining pilot hole in the bed. For
reference, this is the leftmost “B” hole in the
diagram of the bed on a page 7. Your homing
switch kit will include a long, approximately 1.95”
aluminum spacer. Slide thi
s spacer over the 2.50”
wood screw and insert the screw into the hole.
Once screwed in (don’t overtighten!), it will
engage the switch as the bed moves towards the
front. Loosen the screw on the Homing Switch Plate and slide the T nut forward or back in the
rail so the engagement stud you just screwed in activates the switch about a millimeter or two
before the V wheels hit the front frame piece.
Page 26 of 35
