NPT thread gauging and the "rapping" process

marcusja2002

Involved In Discussions
#1
I've just been made aware of the ASME B1.21.1 standard indicating "rapping" is ok to correct nicked threads.

Where can I find the controls on this rapping process, because as I see it, it could be interpreted as a method to just re-ream the thread with the gauge to make it pass.

Any guidance would me much appreciated.

Thanks,
 
Elsmar Forum Sponsor

Eredhel

Quality Manager
#2
I don't have an answer unfortunately but you might contact a gage manufacturer. I had a minor diameter issue while checking a shop made plug gage. I sent an email to Vermont Gage and they were kind enough to point me in the right direction. They also gave me the exact section of a standard that dealt with my specific question.
 
Thread starter Similar threads Forum Replies Date
T How do I calibrate NPT Thread Plug Gages? General Measurement Device and Calibration Topics 9
T Correct use of NPT (National Pipe Thread) Thread Gages General Measurement Device and Calibration Topics 15
S Calibrating a 1/8-27 NPT thread gage General Measurement Device and Calibration Topics 4
S NPT Thread Calibration Method - NPT Taper Thread Plug Gages General Measurement Device and Calibration Topics 9
V Thread Plug Gage Pitch GO Diameter out of spec AQL - Acceptable Quality Level 8
C Aluminum galling on thread plug gauge Manufacturing and Related Processes 10
ScottK Measuring thread flank angle on a screw Inspection, Prints (Drawings), Testing, Sampling and Related Topics 0
G Oversized Threads - What sized stab pin would be best to quickly check for oversized thread holes General Measurement Device and Calibration Topics 5
H Thread Plug Gauge Tolerances General Measurement Device and Calibration Topics 3
A Cost effective thread gaging with ISO 9001 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 2
APHX02 Thread Roll Process Verification w/in AS9100 (i.e. BSP-F-69/AS8879) Manufacturing and Related Processes 2
O Thread Tolerance - Can I use a 3A Ring on a part that the drawing calls out for a 2A? Manufacturing and Related Processes 5
M Error trying to Start a New Thread Elsmar Cove Forum Suggestions, Complaints, Problems and Bug Reports 2
Marc Basic - How to Start a New Discussion Thread Elsmar Xenforo Forum Software Instructions and Help 1
S What the difference is between Stub Acme & Acme thread? Oil and Gas Industry Standards and Regulations 1
Marc Printable Discussion Thread View Elsmar Xenforo Forum Software Instructions and Help 0
S Thread Ring Gauge verification General Measurement Device and Calibration Topics 6
O Thread Diameter as a Datum Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
O ISO 9001:2015 Transition Internal Audit completion thread ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 16
R Thread plug chip groove - Thread plugs without the chip groove General Measurement Device and Calibration Topics 0
S Unique ID Required for Thread Gage Replacements? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 2
M Calibration of Thread Plugs and Ring Gages - Various Thread Standards General Measurement Device and Calibration Topics 3
P Thread recommendation for Cast Iron part Manufacturing and Related Processes 1
K Thread callout - M22 x 1.0-6H 0.100R Thread Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
4 In-House Thread Wire Calibration General Measurement Device and Calibration Topics 5
C Manufacturing Thread Ring Gages Manufacturing and Related Processes 3
E External Thread Cosmetic/Appearance Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
C Thread Gage Training? Training - Internal, External, Online and Distance Learning 3
C Measuring Solid Thread Ring Gages General Measurement Device and Calibration Topics 17
P Best Method of Cleaning of Thread Ring Gages Calibration Frequency (Interval) 5
G Sequence and Frequency of Calibration for Thread Gauges General Measurement Device and Calibration Topics 2
A Product Impact When Thread Rings Require Adjustment General Measurement Device and Calibration Topics 9
kedarg6500 How to calculate Thread Pitch Diameter for non standard TPI like 5/8" 17.75 NF3 Manufacturing and Related Processes 3
I How to determine the thread wire size needed - Buttress Thread Gauge General Measurement Device and Calibration Topics 3
D Roll Form Thread Standard Manufacturing and Related Processes 7
M Thread Gage Longevity Question General Measurement Device and Calibration Topics 6
kedarg6500 Availability of 5/8" 17.75 TPI Thread Ring Gauge & Die Nut Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
N Formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gage Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
6 Print Callout for a Special Thread - 1.173-18 UNS-3A Major Dia. Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
C Calibration of Master Thread Plug Gages General Measurement Device and Calibration Topics 2
C Measurements of Major Diameters of plug thread gages General Measurement Device and Calibration Topics 12
J Thread Gauge Calibration Failure for Pitch Diameter being too large General Measurement Device and Calibration Topics 3
N Free iPhone app - Screw Thread Calculator After Work and Weekend Discussion Topics 0
D Indysoft Calibration Software Thread Plug Template Help General Measurement Device and Calibration Topics 2
K Qualifications I need to adhere to for Thread Gage Calibration Calibration Frequency (Interval) 1
T Inspecting Full Thread Depth with a Plug Gage Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
S Screw Thread Go and No Go Gauge Standard Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
J Acme Thread Gage Tool Wear Measurement General Measurement Device and Calibration Topics 11
A STI (Screw Thread Insert) Thread Gauge-use Before or After Insertion? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
SATHYABALARAMAN Thread Plug Gauge - NO-GO Rejection Criteria General Measurement Device and Calibration Topics 4
Similar threads


















































Top Bottom