Work Instruction to Calibrate or Verify a Combination Square

J

jcschwartz - 2009

#11
Thank you everyone for such informal responses. These tools are used for product verification but it is my belief that a square is either good or bad. There is nothing that can be done to "calibrate" a square. We have between 50 to 60 of them and the company that calibrates them charges $25 a pop. It just seems like a waste of money to me. I want to verify that they are good and if not, get rid of them which is what the calibration company is going to do if they find it to be out of tolerance. Unfortunatly I do not have any real tools to make sure they are good. I do have a small granite table and a 90 block but that is about it. Can I make this work to verify these tools?
 
Elsmar Forum Sponsor

harry

Super Moderator
#13
harry, it's been many years since I took geometry in high school, won't say how many, but I believe that this method can be tied to a "Proof" that we did in class. I would like to meet the auditor that would question the basic foundations of mathematics.
Yes Howard, I think we can claim it to be 'from first principles'.
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#14
Thank you everyone for such informal responses. These tools are used for product verification but it is my belief that a square is either good or bad. There is nothing that can be done to "calibrate" a square. We have between 50 to 60 of them and the company that calibrates them charges $25 a pop. It just seems like a waste of money to me. I want to verify that they are good and if not, get rid of them which is what the calibration company is going to do if they find it to be out of tolerance. Unfortunatly I do not have any real tools to make sure they are good. I do have a small granite table and a 90 block but that is about it. Can I make this work to verify these tools?
Actually, you can calibrate the square.....that involves the comparison and calculating the uncertainties so you know just what you actually have.....for example, if the calibration shows 90 degrees, plus/minus 0.01 degrees MU, then the true value of any measurement you make will be AT LEAST 90 degrees plus/minus 0.01+ degrees.....you will not know exactly what true value is or whether you ever hit true value.....the reason for 0.01+ degrees is because you also then have to calculate the MU as used which WILL be higher than as reported by the cal lab.....the same holds true for the graduations on the linear scale.....

If you send them for calibration, tell the calibration provider to give values plus uncertainty.....anything else is useless to you.....

Hope this helps.

Hershal
 
D

Dimitri

#15
How do you calibrate a square that by simply loosing the lock screw moving the blade by a inch and retightening the lock screw can change slightly the angle of 90* ?? :confused:

If your doing product verification with a 90* square why not get a fixed square that does not have the ability to change with a simple adjustment the 90* angle your measuring and because its fixed there is no chance of "change" in the 90* measurement ?? :confused:

Dimitri
 
Thread starter Similar threads Forum Replies Date
D Work Instruction Question ISO 13485:2016 - Medical Device Quality Management Systems 5
DuncanGibbons Resources for aiding in procedure, work instruction and manufacturing plan development and management AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 0
A Read instruction manual - What Graphic Symbol must I use? US Food and Drug Administration (FDA) 7
J Manufacturing procedure / work instruction depth ISO 13485:2016 - Medical Device Quality Management Systems 12
Mr Roo Work Instruction Authorization ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 12
F Label work instruction - Medical Devices Manufacturing and Related Processes 1
I 2017/745 (MDR) - Instruction for use (IFU) - manufacturer's website EU Medical Device Regulations 15
S Root cause analysis - The system of developing a work instruction is not effective Problem Solving, Root Cause Fault and Failure Analysis 1
J Standard Work Instruction Languages (IATF 16949 8.5.1.2) IATF 16949 - Automotive Quality Systems Standard 8
E Safety work instruction if the equipment have the CE Marking and a Manual with safety instruction Various Other Specifications, Standards, and related Requirements 16
M EU Regulations or Standards for instruction for use (IFU ) EU Medical Device Regulations 3
S Manufacturing Work Instruction examples that include process pictures Manufacturing and Related Processes 3
L I need an example rework procedure/instruction for injected plastic parts Document Control Systems, Procedures, Forms and Templates 2
Q Product Instruction for Use Manual (IFU) - Obligation to list the standard used 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 1
C Example Work Instruction/Procedure for AQL (Acceptable Quality Level) AQL - Acceptable Quality Level 4
W CPU BIST IEC 62304 - Embedded code has CPU instruction tests IEC 62304 - Medical Device Software Life Cycle Processes 2
M Standard work, standardized work instruction & work instruction: What are differences IATF 16949 - Automotive Quality Systems Standard 7
M Work Instruction Content or Sequence Changes and Operation Numbering Document Control Systems, Procedures, Forms and Templates 3
0 Safety Instruction Card and Safety Work Instruction Document Control Systems, Procedures, Forms and Templates 3
L TS16949 Work Instruction Requirements IATF 16949 - Automotive Quality Systems Standard 7
G SOP or Work Instruction for PFMEA? FMEA and Control Plans 5
Z Internal Memo used to document work instruction Document Control Systems, Procedures, Forms and Templates 2
T Handling of Obsolete Material Work Instruction ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 2
M Mention "according to Work Instruction" in Control Plan FMEA and Control Plans 3
alonFAI SMI (Solder Paste Inspection ) Inline Work Instruction (Procedure) Manufacturing and Related Processes 3
G Work Instruction Performance Measures Misc. Quality Assurance and Business Systems Related Topics 3
M ISO 9001 Work Instruction Structure Document Control Systems, Procedures, Forms and Templates 1
W Control of Document - Working Instruction and Checklist ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
D Steps to Complete Quality Control Plans and Work Instruction Manufacturing and Related Processes 4
A Should I call this ?Blank Template? a Work Instruction? Document Control Systems, Procedures, Forms and Templates 11
Q Referencing a Specification in a Work Instruction as a ?Guidance Document? ISO 13485:2016 - Medical Device Quality Management Systems 1
C SOP Work Instruction (Job Card) Template Revisions question Document Control Systems, Procedures, Forms and Templates 6
K Intended Use wording: What is suitable for the instruction manual? EU Medical Device Regulations 4
A Definition Technical Work Instruction vs. Method Statement - Differences Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 6
M Orthopedic IFU ( Instruction For Use ) EU Medical Device Regulations 3
J Control of equipment instruction manuals ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 15
H Writing a Product Label Inspection Work Instruction Manufacturing and Related Processes 2
I Document Control - Instruction Manuals and Service Manuals General Measurement Device and Calibration Topics 2
C SS-EN ISO13485 Work Instruction Requirements for Dentures ISO 13485:2016 - Medical Device Quality Management Systems 2
I Work Instruction for Validation of Packaging to EN ISO 11607-2 Requirements Document Control Systems, Procedures, Forms and Templates 3
M Looking for a Powder Coating Process Instruction Manufacturing and Related Processes 3
J Setting up Performance Review Instruction Phrases in my Company Human Factors and Ergonomics in Engineering 11
W FDA Labeling Requirements - Instruction for Use Content 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 5
L ISO 17021:2011 - The Application of Annex A - Work Instruction Details General Auditing Discussions 9
T AS9100C Work Instruction Clarification - How detailed should a Work Instruction be? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 10
B Work Instruction Application (Software for Document Control) Quality Assurance and Compliance Software Tools and Solutions 2
6 Instruction Manual for the production of Deionized Water Manufacturing and Related Processes 2
M Procedure & Work Instruction Flow Charting vs. Turtle Diagrams AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 7
K Audit Nonconformance? Employee References Work Instruction Internal Auditing 17
S Work Instruction template for Automotive Component (Refrigerator) Manufacturing and Related Processes 11

Similar threads

Top Bottom