Grizzly G8748 User manual

Introduction
The Model G8748 provides excellent alignment,
control, and rigidity when tapping holes. As a
result, tapping will be much easier and you will
have fewer broken taps.
Inventory
A. Fixed Jaw ................................................... 1
B. Lever .......................................................... 1
C. Spindle ....................................................... 1
D. Handle Assembly ....................................... 1
E. L-Frame ...................................................... 1
F. Movable Jaw .............................................. 1
G. Counterbalance .......................................... 1
H. Base ........................................................... 1
I. Adapter Rack .............................................. 1
—Adapter #6 .............................................. 1
—Adapter #8 .............................................. 1
—Adapter #10 ............................................ 1
—Adapter 1⁄4" .............................................. 1
—Adapter 5⁄16" ............................................. 1
—Adapter 3⁄8" .............................................. 1
—Adapter 7⁄16" ............................................. 1
—Adapter 1⁄2" .............................................. 1
—Adapter 5⁄8" .............................................. 1
J. Hardware
—Knurled Knob .......................................... 1
—Cap Screws M10-1.5 x 35 ...................... 4
—Collar ...................................................... 1
—Phillips Head Screws M5-.8 x 40 ............ 2
—Thumbscrew ........................................... 1
—Dowel Pin 4 x 30mm .............................. 1
—Taper Pin ................................................ 1
Cleaning
Remove shipping grease from all coated parts
with a mild solvent or degreaser, then re-coat
them with a light layer of oil to prevent rust.
MODEL G8748
HAND TAPPING MACHINE
INSTRUCTIONS
Figure 1. Model G8748 Hand Tapping Machine.
If you need help with your new item, call our Tech
Support at: [phone].
COPYRIGHT © APRIL, 2007 BY GRIZZLY INDUSTRIAL, INC.
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#TR9245 PRINTED IN CHINA
Figure 2. Model G8748 inventory.
AB
C
D
E
F
GH I
J
Lubrication
After assembly, lubricate the grease fitting on the
side of the L-frame with multi-purpose grease,
then re-lubricate often to minimize wear and ease
operation.

-2- G8748 Hand Tapping Machine
Assembly
1. Attach the L-frame to the base with four M10-
1.5 x 35 cap screws, as shown in Figure 3.
Figure 8. Attaching adapter rack to L-frame.
2. Slide the collar about halfway down the
spindle, then tighten the collar set screw so
the collar is secured to the spindle.
3. Slide the spindle into the L-frame as shown in
Figure 4.
Figure 4. Sliding spindle into L-frame.
Collar
Set Screw
4. Insert the handle assembly into the top of the
spindle, then slide the tapered pin through
the spindle and into the handle assembly
(Figure 5).
6. Attach the lever to the lever bracket with the
dowel pin, then slide the counterbalance onto
the end of the lever and secure it with the
thumbscrew (see Figure 7). The counterbal-
ance helps the spindle return to the up posi-
tion out of the way of the workpiece.
Figure 5. Handle assembly installed on spindle.
Tapered
Pin
7. Attach the adapter rack to the L-frame with
the two M5-.8 x 40 Phillips head screws, as
shown in Figure 8.
Figure 7. Lever and counterbalance installed.
Dowel Pin
Thumb Screw
5. Slide the fixed jaw into the slot on the base
and secure the movable jaw with the knurled
knob, as shown in Figure 6.
Figure 6. Vise jaws installed on base.
Knurled
Knob
Figure 3. Attaching L-frame to base.

G8748 Hand Tapping Machine -3-
Operation
The biggest risk when tapping holes is breaking
the tap. Since taps are hardened, they are also
very brittle and can snap off in the workpiece
if they are over-torqued. Chips may fly into the
operator's eyes if a tap breaks, causing immediate
eye injury. Also, broken taps can be very difficult
to remove, often requiring a special tap extractor.
Figure 9. Tap installed into adapter.
3. Insert the adapter into the spindle (Figure
10), then rotate the adapter until it snaps in
place.
4. Set the depth stop of the tap as follows:
Position the spindle so the tap is at the
desired stopping point, push the spindle col-
lar down so the lever is against the L-frame,
then tighten the spindle collar set screw, as
shown in Figure 11.
Figure 11. Tightening spindle collar set screw.
5. Position the workpiece in the vise so the
drilled hole is aligned with the tap, then
secure the workpiece with the vise.
To remove an adapter:
1. Rotate the clip near the bottom end of the
spindle until the detent ball is exposed.
2. Pull the adapter out.
3. Rotate the clip back over the detent ball to
prepare the spindle for accepting another
adapter.
Always wear safety
glasses when tapping!
To prevent breaking taps, follow these tips:
• Drill a hole to the proper size for your tap
(refer to the documentation included with
your tap set or find a chart on the internet).
• Use tapping lubrication designed for the type
of metal you are tapping.
• Don't force the tap deeper when rotation
becomes stiff. Instead, back the tap out,
clean off the cutting threads, re-lubricate,
then start again.
• Be aware of the tapping hole depth. When
the tap bottoms out in the hole, stop rotating
it. Use the collar provided with the hand tap-
ping machine as a depth stop.
To install a tap and prepare the hand tapping
machine for operation:
1. Slide the tap into a matching sized adapter.
2. Tighten the set screw in the adapter against a
flat surface on the tap shaft (see Figure 9).
Figure 10. Inserting the adapter into the spindle.

-4- G8748 Hand Tapping Machine
G8748 Parts Breakdown and List
1
2
3
4
5
6
7
8
9
10
11
12
13
13
14
15
16
17
18
19
20
21
21
22
22
23 24 25
26
27
28
29
30
31
32
33
34
35
36
REF PART # DESCRIPTION REF PART # DESCRIPTION
1 P8748001 BASE 19 P8748019 COLLAR
2 PSB84M CAP SCREW M10-1.5 X 35 20 P8748020 HANDLE
3 P8748003 FIXED JAW 21 P8748021 KNOB
4 P8748004 MOVABLE JAW 22 PR36M EXT RETAI NI NG RI NG 7MM
5 P8748005 KNOB 23 P8748023 LEVER
6 P8748006 GREASE FI TTI NG 24 P8748024 COUNTERBALANCE
7 PB95M HEX BOLT M5-.8 X 16 25 P8748025 THUMB SCREW
8 P8748008 L-FRAME 26 P8748026 ADAPTER RACK
9 PN06M HEX NUT M5-. 8 27 P8748027 #6 ADAPTER
10 PB93M HEX BOLT M5-.8 X 30 28 P8748028 #8 ADAPTER
11 P8748011 LEVER BRACKET 29 P8748029 #10 ADAPTER
12 P8748012 DOWEL PIN 4 X 30MM 30 P8748030 1/4" ADAPTER
13 PSS07M SET SCREW M5-.8 X 5 31 P8748031 5/16" ADAPTER
14 P8748014 CLI P 32 P8748032 3/8" ADAPTER
15 P8748015 STEEL BALL 3/16 33 P8748033 7/16" ADAPTER
16 P8748016 SPINDLE 34 P8748034 1/2" ADAPTER
17 P8748017 TAPER PIN 35 P8748035 5/8" ADAPTER
18 PSS04M SET SCREW M6-1 X 12 36 PS100M PHLP HD SCR M5-.8 X 40