GAGEMAKER LG-5003 User manual

LG-5003
Lead Gage
OPERATION MANUAL

Lead Gage Operation Manual Model LG-5003
2Copyright © 2014 Gagemaker. All rights reserved
©2014 Gagemaker, LP

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 3
Contents
Introduction
Technical Support 4
Product Information and Updates 4
Parts List 5
Setup Procedures
Setting Up the Lead Gage 7
Zeroing the Lead Gage 9
Operating Procedures
Inspecting Parts 12
Care and Maintenance
Replacing the Indicator 14
Maintenance Tips 19
Warranty Information 19

Lead Gage Operation Manual Model LG-5003
4Copyright © 2014 Gagemaker. All rights reserved
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.
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 between threads, measured on a plane parallel to the
centerline of the threaded part. 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).
Gagemaker’s lead gage, Model LG-5003, uses the three-point system, to inspect thread lead. Two
fixed contact points 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. This unique design does not require
sweeping to obtain measurements. By removing the third contact point, the LG-5003 is easily converted
to a conventional lead gage, which uses two contact points and requires sweeping the gage to obtain
the shortest lead dimension.
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. The increments are normally set at ½”
intervals from 1” – 4”. 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).
To inspect parts, seat the two rear contact points 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 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-5003
Copyright © 2014 Gagemaker. All rights reserved 5
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 Base plate LG-5003-A1 1 9 Indicator set screw LG-5003-A9 1
2 Bearing assembly LG-5003-A2 1 10 Handle LG-5003-A10 1
3 Bearing alone LG-5003-A3 1 11 Handle cap screw LG-5003-A11 2
4 Bearing cap screw LG-5003-A4 4 12 Trigger LG-5003-A12 1
5 Spring LG-5003-A5 1 13 Trigger cap screw LG-5003-A13 1
6 Nose cover LG-5003-A6 1 14 Flat contact point P-500 1
7 Nose cap screw LG-5003-A7 4 15 Contact point* T072* 3
8 Split bushing LG-5003-A8 1 16 Indicator** 80-0403** 1
* T072 contact points are shipped standard, but other contact points are available.
**A higher resolution indicator is available.

Lead Gage Operation Manual Model LG-5003
6Copyright © 2014 Gagemaker. All rights reserved
Setup Procedures
Setting Up the Lead Gage
Materials Needed:
Lead gage Calipers
Contact points (3) 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 Number Thread Pitch Contact Point Model Number
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 11 ½ & 12 pitch T050
14 pitch T041T 14 pitch T041
16 pitch T032T 16 pitch T041
18 pitch T032
API Threads
Connection Type Contact 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-5003
Copyright © 2014 Gagemaker. All rights reserved 7
Setting Up the Lead Gage (continued)
1. Determine interval of measurement required
for the inspection by counting thread roots
(example shows 8 TPI).
The increments in the lead gage are set at ½”
intervals from 1” – 4”.
2. Select the correct contact points to install in
the gage, based on the connection thread
type and pitch size (refer to tables on 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.
8 4 0

Lead Gage Operation Manual Model LG-5003
8Copyright © 2014 Gagemaker. All rights reserved
Setting Up the Lead Gage (continued)
5. Install the remaining two contact points into
the proper holes at the rear of the gage.
6. Once installed, insert a paper clip into the hole
in each contact point and tighten.

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 9
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
API 8-Round Casing, Tubing & Drill Pipe
All 10-Round Tubing
¾ 8 & 10 LS-1001
Straight Threads, 6 -18 Pitch, 4” Length8 & 10 V Form
Tubing (straight)
0 8 & 10 LS-1002
11 ½” “V” API Line Pipe ¾ 11½ LS-1003
Straight Threads, Line Pipe 0 11½ LS-1004
API Buttress Casing, Internal/External 14 ½” - 13 ⅜” ¾ 5 LS-1005
API Buttress Casing, Internal/External 16” &Larger 1 5 LS-1006
6 ⅝API Reg
4”, 5½” - 6 ⅝” API Full Hole
2 ⅞”, 3 ½” – 5” Hughes Xtra Hole
2 ⅜”, 2 ⅞”, 4 ½” Hughes Slim Hole
2 ⅜” - 5½” API INT Flush
API Numbered Connections #23 - #50
2 4 LS-1007
5½”, 7 ⅝” , 8 ⅝” API Reg
API Numbered Connections #56 - #77 3 4 LS-1008
2 ⅜” - 4 ½” Reg
3 ½”, 4½” API Full Hole 3 5 LS-1009
API Numbered Connections #10, #12, #13, #16
M.T. (Macaroni Tubing)
2 ⅜” - 3 ½” PAC
2 ⅜” – 4” American 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
Straight Threads, 1-5 pitch, 4” length N/A N/A LS-5001
Straight Threads, 6-18 pitch, 4” length N/A N/A LS-5002

Lead Gage Operation Manual Model LG-5003
10 Copyright © 2014 Gagemaker. All rights reserved
Zeroing the Lead Gage(continued)
1. Loosen the indicator clamp and place fixed
contact point in the first groove of standard.
2. Slide the gage over until the fixed contact point
seats against the fence.
3. Place moveable contact point into the groove
of setting.
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-5003
Copyright © 2014 Gagemaker. All rights reserved 11
Zeroing the Lead Gage(continued)
4. With the two contact points properly seated in
the grooves of the standard, turn the indicator
dial to align the needle with zero.
5. Tighten the indicator clamp.

Lead Gage Operation Manual Model LG-5003
12 Copyright © 2014 Gagemaker. All rights reserved
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 three-point system on the lead gage provides accurate
readings without sweeping the gage.
1. Seat the rear contact points 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.

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 13
Inspecting Parts (continued)
3. Use your index finger to apply just enough
pressure to maintain the gage’s contact with
the thread flanks. The three point contact
system provides accurate measurements
without sweeping. Take note of the reading.
If you wish to sweep to obtain the shortest
lead dimension, remove the third contact
point, (the one not aligned with the
moveable contact point). Then, using the
rear contact point as the pivot point, sweep
the gage for the measurement.
4. Move the gage to a thread at the rear of the
part and seat the moveable contact point in the
last full thread. Take note of the reading.
5. Record the maximum lead error on an
inspection report.
6. During the inspection process, periodically
verify the gage’s repeatability by placing it on
the lead standard.
!

Lead Gage Operation Manual Model LG-5003
14 Copyright © 2014 Gagemaker. All rights reserved
Care and Maintenance
Replacing the Indicator
Materials Needed:
Lead gage 1/8” hex wrench
Indicator 7/64” hex wrench

Lead gage setting standard

5/64” hex wrench
1. Using a 7/64” hex wrench, loosen the two cap
screws on the gage handle and remove the
handle.
2. Using a 5/64” hex wrench, loosen the indicator
set screw on the nose piece of the gage, and
remove the indicator.
3. Remove the flat contact point from the indicator
stem.

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 15
Replacing the Indicator (continued)
4. Remove the split bushing from the indicator
stem.
5. Insert the flat contact point and sleeve on the
indicator shaft of the new indicator.
6. Tighten the flat contact point.
Do not over-tighten the contact point, as
damage may occur.
7. Insert the new indicator into nose piece of the
gage.
Be sure the split in the sleeve is at a 90º
angle to the indicator set screw.
Set Screw
Sleeve Split
!
!

Lead Gage Operation Manual Model LG-5003
16 Copyright © 2014 Gagemaker. All rights reserved
Replacing the Indicator (continued)
8. Using a 5/64” hex wrench, tighten the indicator
set screw on the gage’s nose piece.
9. Replace the gage handle and tighten the cap
screws with the 7/64” hex wrench.
10. Loosen the indicator set screw to release the
indicator.

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 17
Replacing the Indicator (continued)
11. Place the lead gage on the proper lead gage
setting standard.
12. Using a ⅛” hex wrench, turn the indicator
adjustment screw in the gage’s handle
clockwise until the indicator travel reaches the
maximum limit.
13. Loosen the indicator clamp and rotate the
indicator bezel to align the indicator needle with
–10 to give the gage the proper preload.
14. Turn the ⅛” hex wrench counter clockwise until
the indicator needle aligns with zero. Pull back
slightly on the indicator if necessary.

Lead Gage Operation Manual Model LG-5003
18 Copyright © 2014 Gagemaker. All rights reserved
Replacing the Indicator (continued)
15. Using the 5/64” hex wrench, tighten the
indicator set screw.
16. Remove the lead gage from the lead standard.
17. Place the gage back on the standard to verify
that there is a .010” preload.

Lead Gage Operation Manual Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved 19
Maintenance Tips
Keep all unprotected metal surfaces coated with light oil.
Avoid dropping the gage or subjecting it to any vibration or impact.
Keep the gage dry and away from any machine coolant spray.
Do not force the movement of any of the mechanical parts. The mechanics are designed to move
freely.
Keep the indicator face clean.
Warranty Information
Gagemaker warrants its products to be free from defects in material and workmanship under normal operating
conditions for 12 months from the date of shipment. This warranty is limited to repairing, or at Gagemaker’s option,
replacing any product which is proven to have been defective at the time it was shipped and/or suffered damage
during shipping; provided buyer has given Gagemaker written notice of any such claimed defect within 15 days of
receipt. Any defective product must be properly packed and shipped to the Gagemaker factory in Pasadena, Texas
USA. This warranty applies to all products when used in a normal industrial environment. Any unauthorized
tampering, misuse or neglect will make this warranty null and void. Under no circumstances will Gagemaker or any
affiliate have any liabilities for loss or for any indirect or consequential damages. The foregoing warranties are in
lieu of all other warranties expressed or implied, including but not limited to, the implied warranties of
merchantability and fitness for a particular purpose.
Products Requiring Repair or Calibration Return Process
1. Prior to sending any products to Gagemaker, please call 713-472-7360 and request a Returned
Material Authorization (RMA) number from Sales.
2. Include a Purchase Order or work instructions with the returned product.
3. Return to: Gagemaker LP
712 East Southmore Ave.
Pasadena, TX 77502-110

Gagemaker, LP, P.O. Box 87709, Houston, Texas 77287-7709
712 East Southmore Ave., Pasadena, Texas 77502
Phone: [phone]
Fax: [phone]
Web site: www.gagemaker.com