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.
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B
A
C
F
G
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Figure 2. Model G8748 inventory.
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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.
If you need help with your new item, call our Tech
Support at: (570) 546-9663.
E
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
Assembly
1. Attach the L-frame to the base with four M10-
1.5 x 35 cap screws, as shown in Figure 3.
Figure 3. Attaching L-frame to base.
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.
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.
Knurled
Knob
Figure 6. Vise jaws installed on base.
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 position out of the way of the workpiece.
Thumb Screw
Collar
Set Screw
Figure 4. Sliding spindle into L-frame.
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).
Tapered
Pin
Dowel Pin
Figure 7. Lever and counterbalance installed.
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 5. Handle assembly installed on spindle.
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Figure 8. Attaching adapter rack to L-frame.
G8748 Hand Tapping Machine
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.
Always wear safety
glasses when tapping!
3. Insert the adapter into the spindle (Figure
10), then rotate the adapter until it snaps in
place.
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 tapping 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. Set the depth stop of the tap as follows:
Position the spindle so the tap is at the
desired stopping point, push the spindle collar 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.
Figure 9. Tap installed into adapter.
G8748 Hand Tapping Machine
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.
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G8748 Parts Breakdown and List
22
22
21
21
20
19
18
17
16
25
30
14
35
10
15
13
11
12
34
23
24
33
32
31
36
9
29
28
27
8
5
7
6
13
26
4
1
2
3
REF PART # DES CRIP TION REF PART # DES CRIP TION
1 P8748001 BASE 19 P8748019 COLLAR
2 PSB84M CAP SCREW M10-1.5 X 35 20 P8748020 HANDL E
3 P8748003 FIXED JAW 21 P8748021 KNOB
4 P8748004 MOVABLE JAW 22 PR36M EX T RETA I NI NG RI NG 7MM
5 P8748005 KNOB 23 P8748023 LEVER
6 P8748006 GRE AS E FI TTI NG 24 P8748024 COUNTE RBA LA NCE
7 PB95M HEX BOLT M5-.8 X 16 25 P8748025 THUMB S CREW
8 P8748008 L- FRAME 26 P8748026 ADA PTE R 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
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G8748 Hand Tapping Machine
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