MUELLER
®
B-101
TM
and B-100
TM
Drilling and Tapping Machines
Operating Instructions
8
6. Continue tapping operation until
tapping line on boring bar is flush
with the top of the feed sleeve part
of the cap. (J.)
When tapping asbestos-cement with
one piece Cem-Res
®
combined drills
and taps, it is advisable to exceed
the tapping line enough to allow
corporation stops to be inserted
with only one to three threads
exposed. The exact amount may be
determined by making a “shop-tap”
ahead of time. (Use 50 to 80 foot
pounds of torque to tighten valve
into main after removal of machine.)
Remove The Tool From Main
1. If hand ratchet was used to
make tap, reverse ratchet handle
by adjusting for counter-clockwise
rotation. Rotate the ratchet handle
counter-clockwise carefully and
back out the tool. DO NOT force the
tool when removing it, as this may
cause breakage of the tap teeth.
CAUTION: When this machine
is under pressure, control the
piston action of the boring bar to
prevent bodily injury or damage
to machine.
2. If power operation has been
used to make the tap, reverse the
motor and back out the tool. Control
upward movement of the boring bar
by maintaining a firm hold on the
gear case and motor as stated in
previous caution note.
5. Start motor and rotate feed nut
clockwise by hand to engage tap
part of tool into main. Continue to
rotate feed nut until tap is securely
started into the main and feed yoke
is no longer needed to take thrust
of boring bar. At this point, the feed
yoke may be removed from contact
with thrust collar (on the B-101,
turn the operating screw counter-
clockwise to unlock the pivot arm
and remove the feed yoke) allowing
the boring bar to move downward
and the tool to feed itself. (I.)
NOTE: Feed yoke should remain
in contact with the boring bar
thrust collar and follow the thrust
collar down when machine is
being used on high pressure
mains, thin wall steel pipe or
asbestos-cement pipe. DO NOT
overfeed faster than the tap
is cutting as this will strip the
threads being tapped in the main.
During the tapping operation with
either the B-101 or B-100 machines,
extra precaution is required
because the additional weight of
the power operator tends to cause
overfeeding of the tap resulting
in stripped threads. This is more
serious when tapping asbestos-
cement pipe dry.
IMPORTANT: We recommend
only hand operation of the B-101
or B-100 machines during the
tapping operation of asbestos-
cement pipe which is not under
pressure.
3. When the tap is entirely free from
the pipe, withdraw the boring bar
to the uppermost position again
applying some downward force to
prevent uncontrolled withdrawal of
the boring bar.
If the pressure in the main is greater
than 90psi, a power clevis (H-10802)
may be used to control the upward
movement of the boring bar. (K.)
A power clevis is used as follows
to allow the upward movement of
the boring bar to be done under
controlled conditions. If a power
drive unit has been used to tap the
main, the power unit is removed and
a hand ratchet is used to replace
the gear case.
a). Hook the bent end of the
power clevis over the feed cap
handles.
b). With the ratchet handle in
place on the boring bar, bring the
center point of the control screw
down into contact with the center
hole in end of boring bar.
c). Rotate the ratchet handle
counter-clockwise and the
control screw on the power clevis
at the same rate. As the tap backs
out of the pipe, the power clevis
controls the upward movement.
d). When the tap threads are
out of the main, rotation of the
ratchet handle can stop while the
control screw is rotated to raise
the boring bar to its uppermost
position.
I.
J.
!
K.
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