Kistler-Morse KM L-Cell Bolt-On - Manual (Page 17)

Chapter 3. L-Cell Installation on Vertical Legs
3-3
Notes
1. Use lubricating fluid (Relton RapidTap ® Heavy Duty Cutting Fluid or
equivalent) when drilling and tapping.
2. Drilling and tapping instructions assume metal thickness greater
than 3 /
4
” (19mm). If the thickness is less, drill all the way through the
metal and tap until cutting complete threads through the other side.
Minimum metal thickness is 0.1875” (5mm), which provides six
thread engagement.
Surface Preparation
Installing L-Cells
1. Fig. 3-6. Mark position of beam axis and of drill template mounting
hole.
2. Fig. 3-7a. At the center of the L-Cell mounting location drill a 3 /
4
”
(19mm) deep hole with a #36 drill bit. This produces the template
mounting hole.
3. Peel the backing off the coarse (36) grit sander disk and press the
sander disk onto the surfacing disk. Using the template mounting
hole as a tool center, remove heavy paint and rust with the
drill-mounted surfacing disk until a 2.50” (63.5mm) diameter bare
metal surface is achieved.
• Use straight, constant pressure.
• Do not roll or rock the grinding disk as this will cause a ‘cupped’
surface.
• The goal is to grind a flat surface for mounting the L-Cell,
removing paint and rust.
• Due to the use of coarse grit, the resulting surface is somewhat
coarse.
4. Replace the coarse grit with the fine (60) grit sander disk. Using the
template mounting hole as a tool center, grind until the surface is flat
and smooth to the touch. This results in a 2.50” (63.5mm) diameter
surface where the L-Cell will be mounted. See Figure 3-7b.
Note
The L-Cell must be mounted against smooth, bare metal. All paint
and rust must be removed from the area where the L-Cell is to be
fastened.
5. Repeat Steps 1 through 3 to prepare the surface on the opposite
side of the vertical leg before proceeding with L-Cell installation.
Drill and Tap
1. Using the #6-32 tap, thread the template mounting hole for the L-Cell
(drilled during Surface Preparation) to a minimum
5 /
8
” (16mm) depth,
full threads. (See Figure 3-8) Remove any burrs from the hole.
2. Position the drill template so the center hole lines up with the
template mounting hole.
3. Fasten the drill template to the template mounting hole through the
#5A hole, using the #6-32 x 1 5/8” socket head cap screw. Refer to
the level bubble to ensure correct orientation.
Figure 3-7a: 2.5” Diameter
surface for mounting L-Cell
Figure 3-8: Thread the
mounting hole using Tap and
lubricating fluid.
Figure 3-7b: Prepared surface
showing mounting hole
0.5”
Figure 3-6: Drill Mounting Hole