The Elsmar Cove Business Systems and Standards Discussion Forums 3 Wire Pitch Dia. Method - Measuring Force Correction & Lechowski?s method
 Forum User Name Keep Me Logged In Password
 Register Photo Albums Blogs FAQ Registered Visitors Social Groups Calendar Search Today's Posts Mark Forums Read

 Elsmar Cove Forum Visitor Notice(s)

# 3 Wire Pitch Dia. Method - Measuring Force Correction & Lechowski?s method

 Monitor the Elsmar Forum Courtesy Quick Links Links Elsmar Cove visitors will find useful in the quest for knowledge and support: Howard'sInternational Quality Services International Standards Bodies - World Wide Standards Bodies International Organization for Standardization - ISO Standards and Information Quality Digest

Post Number #1
10th October 2010, 03:56 AM
 sgopal Total Posts: 2
3 Wire Pitch Dia. Method - Measuring Force Correction & Lechowski’s method

Hi I am new here
My question is regarding correct method to apply compression correction in 3-wire method of determining pitch dia.
European co-operation for accredition document EA-10/10 describes method for Correction for the deformation of the spherical probing elements
approximated as a ball-on-flat contact with Hertz’ formula which can be used for compression correction for internal thread measurement by three wire method where spherical ball is used.
This document does not specify method to arrive at deformation of cylindrical wires used external thread measurement by 3-wire method.
Qmsys Thread PD programme says that "The correction for the measuring force is defined by Lechowski’s methods". Inspite of extensive GOOGLING i am unable to find any reference this method.
I find internal thread compression correction results tally with results calculated based on method described in EA-10/10 document for spherical balls.But for external threads the correction is 45 % of internal thread correction
NPL gives compression correction=constant*force^(2/3)/pitchdia^(1/3) with constants specified for different thread forms. It also gives correction chart.
My questions are
1. What is the correct method for applying compression correction.
2. What is formula for Lechowski’s method

Post Number #2
10th October 2010, 05:23 AM
 harry Total Posts: 6,291
Re: 3 Wire Pitch Dia. Method - Measuring Force Correction & Lechowski’s method

Welcome to the Cove.

Qmsys is related to one of our Regular Poster. Be patient and wait for him to check-in (this is a weekend and usually very quiet).

 The Elsmar Cove Business Systems and Standards Discussion Forums 3 Wire Pitch Dia. Method - Measuring Force Correction & Lechowski?s method

 Bookmarks

 Visitors Currently Viewing this Thread: 1 (0 Registered Visitors (Members) and 1 Unregistered Guest Visitors)

 Forum Posting Settings You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Emoticons are On [IMG] code is On HTML code is Off Forum Rules

 Similar Discussion Threads Discussion Thread Title Thread Starter Forum Replies Last Post or Poll Vote tdarling General Measurement Device and Calibration Topics 1 10th July 2012 11:15 AM sgopal General Measurement Device and Calibration Topics 2 13th October 2010 09:00 AM theva Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3 10th September 2010 02:11 PM gagegirl General Measurement Device and Calibration Topics 39 25th June 2010 01:11 PM theva Manufacturing and Related Processes 7 25th November 2009 07:43 AM

The time now is 11:21 AM. All times are GMT -4.