The Handy-Thread machine is ruggedly constructed, and fully adjustable in every way. The
standard machine will cut or roll threads from 1/8" through 5/8" N.C., N.F., or 16mm with
the proper heads.
The standard non-reversing machine uses a 1-1/2 HP, 1725 RPM, 115 volt, 60 Hz, single-phase
electric motor with 3-prong grounded plug. It should be plugged into a 3 prong grounded
receptacle with 20-ampere capacity on 115 volts.
Compressed Air Supply
The standard machine requires a compressed air supply of 85 PSI minimum gauge pressure, with
a flow capacity of about 1/2 SCFM (standard cubic feet per minute). If no compressed air is
available in the plant, or a stand alone unit is desired, a small air compressor of 1/2 HP
which will deliver at least 85 PSI should be adequate for most jobs. The compressor should
be used with a receiver (storage tank) of 10 to 30 gallons capacity.
Cutting Fluid or Coolant
Modern chemistry is developing many new and improved cutting fluids. Contact your local
supplier of cutting tools if you have no special source for purchasing cutting fluid. The
fluid should have a viscosity of no higher than 200 SSU (rated at 100°F). A minimum of 5
quarts and a maximum of 8 quarts is required in the Handy-Thread reservoir. When filling the
reservoir, pour the fluid into the chip pan. It will drain through the chip screen into the
Caution! Do not mix cutting fluids of different kinds because of the possibility of
forming gums which will clog the pump, the coolant tube, or die head.
If the fluid discharge tube should become clogged it can usually be cleared with a blow gun
without removing it from the machine. Blow backward through the tube. If necessary to remove
it for cleaning, unscrew the pipe where it comes out of the machine base plate and pull the
Caution! Running the pump without cutting fluid may damage it. If fluid is not desired
for threading certain materials, turn the pump off with the selector switch on the
electric control box.
If the cutting fluid is too thick (viscosity too high), the pump may have difficulty in
picking it up when the machine is first started and the fluid is cold. This may happen even
with thinner fluids in cold weather.
Caution! Do not use flammable or aromatic solvents to thin the cutting fluid because of
the danger of fire.
Remove/Install Die Head
To install or remove a complete die head, remove cutting fluid guard and loosen (about 2
turns) the socket set screw(s) in the spindle behind the die head. Move the die yoke latch
bar to the right and lift the bronze die yoke out of its groove in the die head. The die
head is now ready to be removed by pulling it toward the operator. Do not hammer on the die
head if it is tight; drive a thin wedge or screwdriver between the die head and the spindle.
Some die heads have die blocks which can easily be removed while the die head remains in the
machine. This allows a quick change of thread size or thread lead. Consult the instruction
manual for your particular brand of die head and proceed accordingly.
To re-install the die head, slip the shank into the spindle hole. Be sure the flat
on the die head shank is exactly in the center under the spindle set screw(s).
Tap the die head lightly with a soft hammer until its base seats against the end of the
spindle, then tighten the remaining set screw(s) in the spindle, drop the die yoke into its
slot, pull the yoke latch bar to the left, and re-mount the cutting fluid guard. Next,
select the proper size rod guide bushing which mounts on the carriage plate and twist 1/8th
turn clockwise. The rod guide bushings are about 1/32" larger than the diameter of the rod
to be threaded.
Next, unscrew the collet retaining nut on the air chuck and remove the collet. Install a
collet for the size rod to be threaded, re-assemble the collet retaining nut, and tighten.
Cutting Single Threads
For threading only one end of a rod, or for threading the same length on opposite ends of
the same rod, first make sure there is at least 85 PSI air pressure showing on the gauge. If
pressure is low, raise it with the pressure regulator located beneath the electrical control
box. Turn the "Alt-Cont-#1" selector switch to its No. 1 (right) position. The indicator
light located inside the selector switch should light. Set the right switch cam (the one on
the longer switch bar) to the desired thread length by reading the scale at the front
(operator) end of the switch bar. Tighten the knurled cam knob finger tight. If threading a
material which requires cutting fluid or coolant, turn on the pump selector switch and wait
until fluid begins to flow. Adjust the position of the fluid tube to direct the full stream
of fluid onto the rod just before it enters the die.
Insert the rod to be threaded through the rod guide bushing and collet, stopping it against
the swing stop arm. Gently push the carriage toward the die head. Do not bump the
rod into the die head because it may chip the chasers.
After engaging the rod into the die head about 1/8", the rod will be pulled along by the die
until the switch cam is contacted, at which time the die head will be automatically opened
by the die head air cylinder.
Caution! Do not start to thread unless there is at least 85 PSI air
pressure. The gauge is mounted on the collet air valve. Without sufficient air
pressure the collet will not clamp the rod securely, and the die head will not open when the
switch cam is actuated. If, after starting to thread, you discover the air pressure to be
less than 85 PSI, turn off the electric motor as quickly as possible to prevent the collet
from jamming into the die head. Use the "Stop" push button on the control box.
Note: For threading rods which are shorter than about 7" long, the rods must be inserted
into the collet from the opposite side. In this case the rod guide bushings and the swing
stop assembly are not used. The accessory twist-on stop rod assembly (furnished with each
Handy-Thread machine) is inserted in place of the rod guide bushing, and adjusted to provide
a stop of the proper depth as the rod is inserted into the collet. Rods as short as 1" long
can be threaded in this way. The swing stop assembly may be left in place while threading
short rods, or if a large number of short rods are to be threaded, the complete swing stop
assembly can be taken off by loosening the two socket head screws on the top of the stop rod
In using the accessory twist-on rod stop assembly, the measuring rules on the switch bar
will not be usable. A trial cut will have to be made, and if the thread length is too short,
the switch cam will have to be re-set for a slightly longer thread. After a little
experience the correct length will be produced on the first or second trial.
Alternate threading is the cutting of threads on opposite ends of the same rod to different
lengths. The machine can be set to alternately produce a shorter, then a longer thread. The
operator can thread a rod on one end then withdraw it and re-insert the opposite end for a
different length thread. To set the Handy-Thread machine for alternate threading, first turn
the "Alt-Cont-#1" selector switch to its "Alt" (left) position. The indicator light will
light only on every other carriage stroke. When it lights, the next thread length will be
that set on the right switch bar cam, usually the longer thread length. Next, set the left
switch bar cam for the shorter and the right switch bar cam for the longer thread length. As
the machine comes from the factory, the shorter switch bar cam can be set for up to 3-1/2"
and the right switch bar cam for up to 6" thread length.
Continuous threading is the cutting of threads longer than 6". To set the Handy-Thread
machine for continuous threading, first turn the "Alt-Cont-#1" selector switch to its
"Cont." (middle) position. During this mode only the right switch bar cam is active. When
the length set on the right switch bar is reached the chuck is opened and the head remains
closed. Caution: at this time the rod will spin, so provisions must be made to insure
operator safety. When the carriage is returned to the neutral (back) position, the chuck
will close on the part and allow an additional length of rod to be threaded. Continue to
cycle the length of the rod you wish threaded. Just prior the last cycle of the desired
threaded length, switch the "Alt-Cont-#1" switch to "#1" (left) position. When the right
switch bar is reached this time, the head will open. Turn off the machine to stop the
rotation of the head and to release the rod from the chuck. It is important to turn off the
machine prior returning the carriage the neutral position to prevent damage to the threads.
To determine the setting for the right switch bar, divide the length of the desired thread
in to even cycles less than 6" (ie. to cut a 15.75" thread, set the switch bar to 5.25" and
run for 3 cycles).
Standard accessories furnished with the Handy-Thread machine include five sizes of
quick-change rod guide bushings, each with a hole slightly larger than the rod to be
threaded. These bushings are for supporting the rod and guiding it into the collet. Also
included is the accessory rod stop for use in threading very short rods. This stop is used
in place of the swing stop for short rods, and twists on to the carriage plate.
The standard machine uses standard No. 11 collets. These are not furnished unless specified
on your order. Round collets in increments of 1/64" in diameter from 1/8" through 13/16" are
available from AAA Products. Larger rods, up to 1" in diameter, can be held by using an
optional special collet sleeve, collet retaining nut, and using a standard No. 21 collet.
For information contact the Jiffy Products Division of AAA Products International. Special
collets to hold hex and square rods are also available from the factory.
The kind of material, its hardness, and its diameter will determine the maximum spindle RPM
which can be used. The standard machine is assembled with motor and spindle pulleys to have
a speed of 400 RPM on the spindle. This is a good speed for a wide range of threading jobs,
for cold rolled (low carbon) steel up to 1/2" in diameter with the right cutting fluid.
Larger rods of this material can usually be threaded at this speed although die chaser life
may be reduced. However, on long production runs, spindle speed should be reduced on rods
larger than 1/2" in diameter. It is quite important that the proper amount of the right
cutting fluid be used and that it be directed on the rod as close as possible to the place
where the material enters the die.
If rods of less than 3/8" diameter are to be threaded in quantity, the spindle speed can be
increased by replacing the motor pulley with one of larger diameter. We recommend your die
manufacturer be consulted for best surface speed of a particular material along with
recommendations on lubricant or coolant.
For threading harder materials such as stainless steel or higher carbon steel, the spindle
should be run at a slower speed. The standard pulley supplied on standard units may be
replaced with an optional pulley. These are standard timing belt pulleys for a 1" wide belt,
and can be purchased either from the factory or from a local power transmission dealer. It
is unimportant to change the pulleys for a short run of small rods.
For best production rate the machine should be run, if possible, at the highest RPM or
surface speed (SFM) recommended by the head manufacturer. When running at higher speeds,
particularly on large diameter rods, or when threading harder materials, it is especially
important to use the right amount of the right cutting fluid and to see that it is directed
Changing Belt and/or Pulley
Remove the drive belt guard and loosen the belt tension adjusting knobs. Remove the belt and
the motor pulley. Install the replacement pulley. Align the motor and spindle pulleys, then
tighten the pulley screws. Install the belt, then adjust the belt tension knobs to produce a
light tension on the belt. Install the belt guard. Caution! Do not operate the
machine without the belt guard in place.