12
Operation Guide
(
Making threads
NV-auto Die Head)
The NP/NR50A Series comes with the Manual, NV-auto, or Uni-auto
die head (1/2 - 2") and 2 sets of dies (1/2 - 3/4")(1 - 2") as standard
accessories.
Check that the dies you use match the size of pipe you are working on.
Loosen the lever nut on the die head and match the marking on
the cam plate fixing pin with the pipe size on the size plate; then
retighten the lever nut. (Fig. 25)
Press down on the Open lever to put it into the 'Set' position.
(Fig. 26)
Switch the machine on and oil will start flowing automatically from
the die head.
Turn the carriage handle to the right to engage the pipe with the dies.
Cut 3 or 4 threads and threading will then be performed
automatically. (Fig. 27)
When the prescribed length of thread has been cut, the dies will
automatically be released by the auto-open lever.
Finally, release the die head from the pipe by turning the carriage
handle to the left.
13. Making threads
(NV-auto Die Head)
To avoid accident or injury, always start the thread cutting process
with the carriage to the right of the red line on the front support bar.
CAUTION
Fig. 25
Fig. 26
Fig. 27
Lever nut
Open lever
Size plate
Tighten
Loosen
Carriage handle
Set
1. Open
Open lever
Marking on the cam plate fixing pin
Large
Small
Open
Set
Auto-open
lever
1. Removing the auto-open lever. (Fig. 28-1)
Loosen the hex-socket cap screw (M6 x 12) and remove the
auto-open lever together with the washer and the spring
washer.
* Make sure you do not lose any of the parts you remove.
If you do, you will not be able to use the auto-opening
function to cut threads of a regular length.
2. Resetting for regular tapered threading. (Fig. 28-2)
Adjust thread length by sliding the auto-open lever
forward or backward.
You can make shorter threads or any length of parallel threads, bolts etc., if you raise the open lever at the length you
want. When threading longer parallel threads, remove it as described below.
If the die head does not open automatically for some reason, such as scrap preventing it from opening, you can open
the die head by raising the open lever. (Fig. 25-1)
* Make sure the die head and dies are appropriate for the type of thread that
you wish to make; for example, threadsr bolts etc.
hex-socket
cap screw
spring
washer
Fig. 28-2
Fig. 28-1
Auto-open
lever
washer
