Gaging for Dryseal Pipe Threads (NPTF) and calibration of these gages

DietCokeofEvil

Trusted Information Resource
#11
I am not a huge fan of using a taper sine block to measure the pitch diamter on a tapered thread. Why? Because you are basing your measurements on an assumption.

Measuring with the taper sine block give you the small end P.D. Lovely.

The important part of the taper is at the notch. Of course, you can do the math and calculate your P.D. at the notch- but that math is ASSUMING that the taper of the thread is 0.0625 EXACTLY. It could be 0.0005 in either direction, or completely made wrong. Of course, you can take a measurement at the small end and the notch and incorporate the difference into your calculations, but I still don't like that.

I prefer a functional check using a master gage.

To the OP- if you like, I have a nice little Excel spreadsheet I can send you that does the math for you. PM me.
 
Elsmar Forum Sponsor
Thread starter Similar threads Forum Replies Date
A Cost effective thread gaging with ISO 9001 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 2
Roberticus MSA for gaging which specifies process parameters and 7.6.1 Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
E Floor Gaging for Internal Thread Major Diameters Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
F Optical Gaging Systems - Shadows, debris, etc. cause parts to measure out of spec Measurement Uncertainty (MU) 7
E SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B Inspection, Prints (Drawings), Testing, Sampling and Related Topics 15
P Doubt about MSA for Attributes Gaging - Reference Value Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 8
T Thread Gaging: Hand Tight Definition Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
C Part Tolerance and TAR (Test Accuracy Ratio) - Non-Fixed Gaging General Measurement Device and Calibration Topics 2
S Laser Gaging System Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
R Thread Inspection - Using go/no-go gaging to inspect threads Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
J "Gaging" the performance of a replacement gauge Capability, Accuracy and Stability - Processes, Machines, etc. 6
B In need of good Gaging house in the Midwest Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
M Checking a male taper using a female air gage fixture - Air Gaging question Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
G Air gaging information - Federal/Mahr Federal 'Dimensionair' Air Gages (EAG-31111) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
D July ME TV: Measurement & Gaging Video Book, Video, Blog and Web Site Reviews and Recommendations 2
Z Supplier of Automatic Gaging Systems need to be on our Approved Supplier List? IATF 16949 - Automotive Quality Systems Standard 6
R SAE AS8879 Interpretation - Using a Johnson Thread Gaging System Various Other Specifications, Standards, and related Requirements 1
T Gear / Spline Gaging - Both Internal and External Splines Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
apestate What tools and techniques are used in paper gaging? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
O For Reference Only Gaging question! We make sub-components General Measurement Device and Calibration Topics 6
D Reducing gaging frequency/High Cpk Capability, Accuracy and Stability - Processes, Machines, etc. 4
D Who is required to comply with Guide 25 / ISO 17025 - Multi-feature variable gaging ISO 17025 related Discussions 3
J Painted cut threads - ASME Pipe Suppliers Manufacturing and Related Processes 6
K Testing Large Plastic Pipe Imported Legacy Blogs 0
C Testing for Belt Longevity - 20ft Pipe Reliability Analysis - Predictions, Testing and Standards 4
Marc Pipe Break At Coal Facility Contaminates West Virginia Waterway Miscellaneous Environmental Standards and EMS Related Discussions 0
R How to Inspect the Weld Strength of High Pressure Vessel & Oil Pipe Line Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
E Piping for Injection Water - Regulated or not & can welded or seamless pipe be used? US Food and Drug Administration (FDA) 9
optomist1 Digging Datums - Feature control frame (FCF) applied to a pipe I.D. Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
T Correct use of NPT (National Pipe Thread) Thread Gages General Measurement Device and Calibration Topics 15
P ASTM B687 Brass Pipe Nipple Standard Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
R Do I need CE Marking? Pipe Organ Control System CE Marking (Conformité Européene) / CB Scheme 8
D Procedure for Preserving and Handling Flange & Pipe Materials ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 5
K Quality Control on Braided Metal Hose covering Stainless Steel Pipe - Fixing Dents Benchmarking 7
E Projection welding of pipe (cold drawn seamless tube) with rod spatter problem Manufacturing and Related Processes 8
C Pipe Supports Visual Examination Procedure example needed Document Control Systems, Procedures, Forms and Templates 3
ScottK National Pipe Straight Mechanical (NPSM) Specification? Various Other Specifications, Standards, and related Requirements 6
C Meeting Validation of Process Requirement - Stainless steel pipe & tube manufacturer ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3

Similar threads

Top Bottom