RIDGID 141 Operator's Manual page 6

Model 141/161 Receding Geared Threaders
Thread Size Adjustment
With the drive shaft/die head of geared threader up, turn
the drive shaft or gear case by hand. Align the die head
with appropriate starting point marks on the guide post or
pinion sleeve (see Figure 4) . The thread size needs to be
set before every thread to insure proper thread size.
• Standard Size Thread – either set bottom of the die
head flush with the red standard line on the pinion
sleeve, or set the upper surface of die head flush
with the centerline on the guide post.
• Oversize thread (larger diameter, less turns of fitting
engagement) – set upper surface of the die head
flush with the bottom line on the guide post. That line
is marked "2T OVER".
• Undersize thread (smaller diameter, more turns of fit-
ting engagement) – set upper surface of the die head
flush with the top line on the guide post. That line is
marked "2T UNDER".
Threader can be adjusted to any point in between as
desired.
Pinion Sleeve Standard
Die
Head
Figure 4 – Thread Size Adjustment – Close-Ups of Pinion
Sleeve and Guide Post Markings
Adjusting for Straight or Tapered Threads
Geared threaders are factory set to make tapered threads
(NPT or BSPT), and can be adjusted to cut straight
threads (NPSM or BSPP). Tapered threads are made with
the guide block engaged in the angled slot in the guide
post. Straight threads are made with the guide block
engaged in the straight slot in the guide post.
1. Adjust the geared threader to cut a standard size
thread (see above) .
2. Remove screw from gear case at the base of guide
post.
3. Pull the guide post up until guide block (attached to
selector plate) is disengaged from the slot in the
guide post.
6
2T Under
Standard
Guide Post
Die
Head
Angled Slot
Guide Block
Figure 5 – Adjusting For Straight or Tapered Threads
4. Turn the guide post until appropriate slot (angled for
tapered threads, straight for straight threads) faces
inward and is aligned with the guide block.
5. Engage guide block in the guide post slot and push
the guide post down into the gear case.
6. Reinstall the screw in the gear case at the base of
guide post.
Changing Dies
Geared threaders are marked with the number of threads
per inch on the nameplate. The threaded barrel for an
NPT geared threader has 8 threads per inch, while a
BSPT geared threader has 11 threads per inch.
Do not use BSPT dies in NPT threader and
NOTICE
vice versa. This will cause incorrect threads and may
damage dies and/or geared threaders
1. Place the geared threader with drive shaft/die head
up.
2. Remove stop screw from the selector plate (Figure 3) .
3. Pull cam plate knobs out and rotate cam plate to
"CD" mark on top of the die head.
4. Remove the existing dies from the die head.
5. Insert correct dies for the application into the slots. The
numbers on the dies (1-5) must correspond with the
Guide Post
Straight Slot
Gear Case