Sherline Products CNC Metric Linear Controller Installing And Using

WEAR YOUR
SAFETY GLASSES
FORESIGHT IS BETTER
THAN NO SIGHT
READ INSTRUCTIONS
BEFORE OPERATING
CNC Metric Linear Controller
P/N 8851
Installing and Using
the Sherline CNC Linear Controller
By Bryan Mumford and Joe Martin
Using the Template Blocks to Locate New Mounting
Holes for the Stepper Motor Mounts
This kit contains a template block that will help you locate
the holes needed to fit stepper motor mounts to your Sherline
mill table (X-axis) or base (Y-axis). (Sherline machines
manufactured after 9/99 have the stepper motor mount
holes predrilled to make this job easier.) The rectangular
template block is used to aid in drilling these holes on the
mill. These blocks are not hardened, because they will only
be used once or twice. To drill the holes for the stepper
motor mount for each axis, follow the steps below:
1. Using the handwheels, move the table and saddle so
that they are as close to the handwheel as possible.
2. On models with standard handwheels, break loose the
5-40 screw in the center of the face of the handwheel
before removing the handwheel. The handwheel gives
you a way to hold the leadscrew while breaking the
center screw loose.
3. Remove the handwheel by loosening its set screw with
a 3/32" hex wrench and pulling it off the shaft. (For
adjustable "zero" handwheels, rotate the engraved red
collar until the hole lines up with this set screw.)
2 Holes—Drill .5" Deep,
Tap 8-32 X .4" Deep
MILL BASE
FIGURE 1—The rectangular block is used for the mill table and
base. On the table, the two new drilled holes are ABOVE the
existing center hole. On the base, the two new holes go BELOW
the center hole as shown in the drawings above.
SHERLINE PRODUCTS INC. • 3235 Executive Ridge • Vista • California 92081-8527 • FAX: (760) 727-7857
Toll Free Order Line: (800) 541-0735 • International/Local/Tech. Assistance: (760) 727-5857 • Internet: www.sherline.com
CAUTION: The power cord
receptical in the control box is
easily damaged. Plug and unplug
the power connector with care!
NOTE: The power supply included with this indexer (linear controller) is intended to
operate only on 115/120 VAC, 60 Hz (38 W) current. For countries operating on 100,
220 or 240VAC and/or 50Hz a transformer will be required. As an alternative, this power
supply outputs 24VDC, 1 Amp (1000 mA). If you can purchase an appropriate power
supply that operates on local current and outputs 24VDC, 1A current, it could be used to
power the unit instead of the one supplied. Sherline Products does not provide a 220V
power supply or transformer.
4. Remove the leadscrew thrust from the table or base by
removing the single 5-40 screw.
5. Remove the 5-40 screw from the end of the leadscrew
being careful not to damage threads or shaft as you
keep the screw from rotating.
6. Bolt the template parallel to the table or base with the
5-40 SHC Screw provided with the kit.
7. Using the holes in the template as a drill guide, start
each hole about 1/16" deep with a #29 drill (0.136").
8. Remove the template block and drill each hole .25"
deep backing the drill out to clear chips add cutting
oil and finish drilling the hole in two more steps until
a depth of 0.5" is reached. Countersinking the holes
will make it easier to start a tap.
9. Tap the holes to 8-32 to 0.4" depth. Be sure to use
cutting oil. Remember the part is relatively expensive
to replace. Take your time. Remove any burrs from the
surface of the part after tapping the hole.
1. Thread the preload nut onto the leadscrew.
2. Slide the stepper motor mount over the X- or Y-axis
leadscrew end.
3. Push a coupler through the bearings and over the
tapered end of the leadscrew. Attach it to the leadscrew
with the new 5-40 screw provided. To tighten, put a
hex key through the hole in the side of the mount and
Template Block
(Holes ABOVE center hole) into the handwheel shaft set screw. Hold the key to
keep the shaft from turning while tightening the 5-40
SHCS in the end of the coupling.
4. Using a 3/8" wrench, adjust the preload nut snugly
Template Block
against the end of the bearing. Tighten to remove
(Holes BELOW center hole)
all endplay. (See Figure 3 to understand how the nut
preloads the bearings.) Turn the coupling by hand to
make sure it turns freely, then put a little LocTite
the threads behind the preload nut and let capillary
action draw the fluid in. Figure 2 shows how to use
a hex key through the hole in the mount to keep the
coupler from turning while tightening the preload nut.
5. With the leadscrew screwed into the mill saddle as
far as practical and the table moved to its extreme left
position, attach the stepper motor mount to the table
Installing the Stepper Motor Mount
on
®
8/1/18