GAGEMAKER LG-6001 User manual

LG-6001
Lead Gage
OPERATION MANUAL

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
2
©2016 Gagemaker, LP
OMLG60014-16

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 3
Contents
Introduction
Technical Support 7
Product Information and Updates 7
Parts List
Parts List 9
Setup Procedures
Setting Up the Lead Gage 10
Adjusting the Lead Gage 13
Zeroing the Lead Gage 15
Operating Procedures
Inspecting Parts 18
Care and Maintenance
Replacing the Indicator 20
Maintenance Tips 23
Warranty Information 23
Products Requiring Repair or Calibration Return Process 23

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
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Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 5
Congratulations! Your decision to purchase a Gagemaker product above all others on the market
demonstrates your confidence in our quality and workmanship.
To ensure the high performance and operation of our product, we urge you to use the included reference
materials. They contain important information for proper setup and use of the equipment. Also, we
recommend that you follow the care and maintenance tips in this manual to keep the equipment working
in top condition.
If your questions have not been addressed in our reference materials, contact your local
representative or a customer service representative at 713-472-7360.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
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Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 7
Introduction
The lead gage inspects both internal and external thread lead using contact points that seat in the
threads of a part. Thread lead is the distance from a point on a thread to a corresponding point on the
next thread turn, measured parallel to the thread axis. The pitch of the thread determines the diameter
of the contact points required for taking measurements (refer to the tables for ACME, Stub ACME, UN
and API Threads in the Setup Procedures section of this manual for contact point model numbers).
Gagemaker’s lead gage, Model LG-6001, uses two contact points to inspect thread lead. One fixed
contact point at the rear of the gage and one moveable contact point at the front of the gage provide
complete stability when taking thread lead measurements.
Before inspecting parts, the lead gage must be preset to a nominal predetermined dimension, using a
lead gage setting standard. These setting standards are manufactured according to ANSI and API
specifications with grooves ground at precise increments. Lead standards are available for ACME, Stub
ACME, UN and API threads (refer to the table in the procedure for Zeroing the Lead Gage in this
manual for lead standard model numbers).
To inspect parts, seat the rear contact point of the gage into the thread of the part. Then, seat the
moveable contact point at the front of the gage in the thread. Apply pressure to the nose of the gage
with an index finger and sweep from side to side to get an indicator reading. It is recommended that the
gage be zeroed periodically during use to maintain accurate readings.
Technical Support
Phone: [phone]
Hours: Monday – Friday 8AM – 5PM (CST)
Product Information and Updates
Visit our web site at: www.gagemaker.com

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
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Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 9
Parts List
Take some time to become familiar with all the parts that make up the lead gage by reviewing the
labeled diagram below. The part names are important for understanding the operating
instructions.
Item
Description
Part Number
Qty
Item
Description
Part Number
Qty
1 Contact Point (T072)* 4-1-315 2 11 Front Brake Washer 4-2-8271
2 Bearing Pack Assembly 4-2-815 1 12 Handle 4-2-8291
3 Body 4-2-819 1 13 LG-6001 Contact Point 4-2-894 1
4 Side Cover 4-2-820 1 14 Indicator (157SSGA) 8-0-270 1
5 Base Plate 4-2-821 1 15 Flat Head Socket Screw 8-0-607 4
6 Contact Point Holder Bar 4-2-822 1 16 #2 Plastite Screw 8-0--624 8
7 Drive Nut 4-2-823 1 17 SHCS #2-56 X ⅛” 12-0-045 2
8 Thumb Knob 4-2-824 1 18 SCHCS #4-40 X 1/32” 12-0-216 2
9 Adjustment Screw 4-2-825 1 19 SSSCP #4-40 X 3/16” 12-0-145 1
10 Back Brake Washer 4-2-826 1 20 SBHCS #8-32 X 9/16” 12-0-203 1
*T072 contact points are shipped standard, but other contact points are available.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
10
Setup Procedures
Setting Up the Lead Gage
Materials Needed:
Lead gage Calipers
Contact points (2) Paper clip
Setting up the lead gage, involves installing the proper size contact points for the application (refer to the
table below for selecting the proper model contact point for ACME, Stub ACME, UN threads or API
threads).
ACME or Stub ACME Threads
UN Threads
Thread Pitch
Contact Point Model No.
Thread Pitch
Contact Point Model No.
1 pitch T531T 1 pitch T562
1.5 pitch T344T 2 pitch T288
2 pitch T266T 3 pitch T188
2.5 pitch T219T 3.5 pitch T188
3 pitch T188T 4 pitch T144
3.5 pitch T144T 4.5 pitch T128
4 pitch T128T 5 pitch T115
5 pitch T105T 5.5 pitch T105
6, 7 pitch T090T 6 pitch T096
8 pitch T062T 8 pitch T072
10 pitch T050T 10 pitch T057
12 pitch T041T 12 pitch T050
14 pitch T041T 14 pitch T041
16 pitch T032T 16 pitch T041
18 pitch T032
API Threads
Connection Type Point
Diameter Thread Pitch Contact Point
Model Number
Hughes Slim Line H-90
0.235”
3
T235
All Hughes H-90 0.200” 3 ½ T200
API Rotary Shouldered Connections 0.144” 4 T144
API Rotary Shouldered Connections
0.128”
4 ½
T128
API Rotary Shouldered Connections
0.115”
5
T115
Truncated for Extreme Line 0.105” 5 ½ T105T
API Rotary Shouldered Connections
0.096”
6
T096
API Tubing, Casing and Line Pipe 0.072” 8 T072
Buttress Casing - Lead 0.062” 5 T062
API Tubing and Line Pipe
0.057”
10
T057
API Line Pipe 0.050” 11 ½ T050
API Line Pipe 0.041” 14 T041
API Line Pipe
0.032”
18
T032
API Line Pipe 0.021” 27 T021

Lead Gage Operation Manual Model LG-6001
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Setting Up the Lead Gage (continued)
1. Determine interval of measurement required
for the inspection by counting thread roots.
2. Select the correct contact points to install in
the gage, based on the connection thread
type and pitch size (refer to tables on the
previous page).
3. Verify the diameter of the contact point ball
using calipers or a micrometer.
4. Install a contact point into the moveable
holder at the front of the gage.
5
4
6
7
10
8
32

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
12
Setting Up the Lead Gage (continued)
5. Determine the location of the remaining
contact point based on the interval required to
measure the part (from Step 1).
6. Install the contact point into the fixed holder at
the rear of the gage.
7. Once installed, insert a paper clip into the hole
in each contact point and tighten.

Lead Gage Operation Manual Model LG-6001
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Adjusting the Lead Gage
Materials Needed:
Lead gage Hex wrench
Lead standard
1. Unlock the screw at the front of the gage with
a hex wrench to loosen the rear contact point.
2. Place the gage on the lead standard and turn
the adjustment knob at the rear of the gage
until the rear contact point is aligned with the
appropriate groove.
3. Continue rotating the adjustment knob until
the indicator needle makes one full revolution
of preload.
4. Lock the indicator knob.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
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Adjusting the Lead Gage (continued)
5. Tighten the screw on the front of the gage with
a hex wrench.

Lead Gage Operation Manual Model LG-6001
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Zeroing the Lead Gage
Materials Needed:
Lead gage Lead gage standard
The lead gage performs a comparative inspection between a fixed standard and the threaded part.
Before applying the gage to a part, you must zero the lead gage on the proper standard.
Based on the type of connection being inspected, locate the proper lead gage standard in the table
below to ensure consistent and accurate readings. The lead gage should be zeroed on a standard once
during each shift, at a minimum.
Connection Type Taper
(in/ft) Threads per Inch
Lead Gage
Standard Model
Number
8 & 10 Round Tubing / Casing ¾ 8 & 10 LS-1001
8 & 10 V Form Tubing (straight) 0 8 & 10 LS-1002
Line Pipe Tubing / Casing ¾ 11½ LS-1003
Line Pipe (straight) 0 11½ LS-1004
13 ⅜” & smaller Buttress Casing ¾ 5 LS-1005
16” & larger Buttress Casing 1 5 LS-1006
6 ⅝API Reg
4”, 5½” - 6 ⅝” FH
2 ⅜” - 5½” IF
2 ⅞” - 5” XH
NC23 – NC50
2 4 LS-1007
5½” Reg
7 ⅝” - 8 ⅝” Reg
NC56 – NC77
3 4 LS-1008
2 ⅜” - 4 ½” Reg
2 ⅞” - 3 ½”, 4½” FH
3 5 LS-1009
2 ⅜” Open Hole 1½ 4 LS-1010
3½” - 6 ⅝” H-90 2 3½ LS-1011
7” - 8 ⅝” H-90 3 3½ LS-1012
2 ⅜” - 3½” Slimline H-90 1¼ 3 LS-1013

Lead Gage Operation Manual Model LG-6001
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Zeroing the Lead Gage(continued)
1. Loosen the indicator clamp and place fixed
contact point in the second groove of standard.
2. Place moveable contact point into the first
groove of standard.
3. With the two contact points properly seated in
the grooves of the standard, sweep the
moveable contact point from side to side in
order to obtain the smallest indicator reading
(needle changes direction).
For Non-V threads, pull the lead gage
toward the load flank of the groove in the
standard.
For V threads, be sure the contact points
touch both flanks of the groove in the
standard.
!

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 17
Zeroing the Lead Gage(continued)
4. Turn the indicator dial to align the needle with
zero.
5. Tighten the indicator clamp.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
18
Operating Procedures
Inspecting Parts
Materials Needed:
Lead gage Inspection report

Part
Inspecting parts using the lead gage involves placing the lead gage’s contact points in the flanks of the
thread to obtain an indicator reading. The two-point system on the lead gage provides accurate readings.
1. Place the fixed contact point into the thread
next to the first scratch on the part (or first full
thread).
2. Rock the gage forward and seat the moveable
contact point into the thread. Use your index
finger to apply just enough pressure to
maintain the gage’s contact with the thread
flanks.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved 19
Inspecting Parts (continued)
3. Using the fixed contact point as the pivot point,
sweep the gage left and right to locate the
smallest indicator reading. Take note of the
indicator reading.
4. Move the gage to the next thread, repeat the
sweeping action and note the indicator reading.
5. Move the gage to a thread at the rear of the
part and seat the moveable contact point in the
last full thread.
6. Sweep the gage from left to right in order to
obtain an indicator reading. Take note of the
reading.
7. Record the maximum lead error on an
inspection report.
8. During the inspection process, periodically
verify the gage’s repeatability by placing it on
the lead standard.

Lead Gage Operation Manual Model LG-6001
Copyright © 2016 Gagemaker. All rights reserved
20
Care and Maintenance
Replacing the Indicator
Materials Needed:
Lead gage Hex wrench
Indicator Phillip’s head screwdriver
1. Using a hex wrench, remove the four screws
from the back of the gage.
2. Remove the handle.
3. Remove the eight screws on contact point
holder bar.
4. Remove contact point holder bar from the gage
body.
5. Remove the side cover.