Calibration of CNC Machines - Does anyone have written documentation procedures?

#1
Does anyone have written documentation procedures on how to calibrate CNC machines to ensure that produce consistent product?
 
Elsmar Forum Sponsor
C

CJacobsen

#2
In my experience (working with a Machine Tool Manufacturer a few years ago - lots of CNC machines in this facility) when calibration of these machines came up, the manufacturer of the machine had supplied the alignment and calibration procedures and in fact for most of the machines, these procedures could be found in the Technical Manuals. I would check these two places first. These are procedures that are performed usually during the initial installation and set-up of the machines.

Even though most machines came with a 'Test' program, this facility developed their own 'test' program for each machine that related to the parts they were actually producing. This program was used in conjunction with written instructions for setting up the machine to perform the test. This procedure (written instructions and test program)was run after the initial set-up, calibration and alignment of the electronic and mechanical systems was performed. Depending on the machine, the program instructed the machine to produce a part or machine raw material to a specific size, pattern, shape or whatever, and then this was checked using standard micrometers, calipers, gages, etc. and the data recorded.

One aspect determined to be a big factor in the machine passing the 'test' program test, was the tooling currently in the machine. After many runs, it was determined that the actual cutting edge of the tool being used contributed the most error or variance in the piece being produced as opposed to the finite movement and placement control of the cutting tool.

Subsequent checks of machines were done using this test program and written procedure only. Cycles were every 3 or 6 months. This cycle was determined mostly by the production rate of the machine. If the part was produced to size/spec., the machine was considered 'in cal.' If the part was not produced properly, the full calibration/alignment procedure was performed.

Hope this helps.
 
C

CJacobsen

#3
I should add that some machines were tested more frequently than the 3 or 6 months stated above. This facility had 110 or so machines. Generally the smaller machines were tested more frequently - two weeks to 1 month cycles. This was due to the heavy production load and nature of the machines.

Tool life was also monitored and tooling was changed based on number of cuts or time in service as opposed to when it got dull (of course it could be changed any time sooner if warranted.) This was to prevent the tooling from getting worn to the point that the variance introduced was unacceptable.
 
Thread starter Similar threads Forum Replies Date
J CNC Machine Tool Calibration - 6 dof Calibration Interferometers General Measurement Device and Calibration Topics 1
L Caliper Calibration Standards - One for CNC and one for Sheet Metal? General Measurement Device and Calibration Topics 9
J CNC Calibration - What should be calibrated on a HAAS machine? General Measurement Device and Calibration Topics 7
M Machine Tool Calibration - Machine Capability Studies on CNC Machine Tools Manufacturing and Related Processes 5
A AS9100 - 7.1.5.2 In-House Calibration AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 20
B UV-A and Illuminance meter Calibration Setup General Measurement Device and Calibration Topics 0
S Calibration Related Posters General Measurement Device and Calibration Topics 2
F Quality Control in Electrical Calibration ISO 17025 related Discussions 0
C Narrow definition of IMTE or calibration possible? ISO 13485:2016 - Medical Device Quality Management Systems 8
dhuot1990 In-House Calibration Program - Biotech Industry General Measurement Device and Calibration Topics 3
M Reference part calibration or verification General Measurement Device and Calibration Topics 12
M Calibration of equipment IATF 16949 - Automotive Quality Systems Standard 4
Q Gage calibration / tracking software General Measurement Device and Calibration Topics 5
C Should resolution be included in uncertainty budget for digital caliper or micrometer calibration? Measurement Uncertainty (MU) 5
S Calibration Due date-Critical Connie General Measurement Device and Calibration Topics 16
Q Request Calibration Info Calibration and Metrology Software and Hardware 16
R Calibration Log - Archive Manufacturing and Related Processes 2
U Calculate acceptance of equipment reading after calibration General Measurement Device and Calibration Topics 2
D Question on Documented Calibration versus ISO 17025 Accredited Calibration ISO 13485:2016 - Medical Device Quality Management Systems 2
U Calculate acceptance of calibration reading Measurement Uncertainty (MU) 1
D Air hood calibration ISO 13485:2016 - Medical Device Quality Management Systems 1
K Ground Bond Test for Class I Medical Electrical Equipment - calibration problems IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
E Calibration/Verification Report Durometer ISO 17025 related Discussions 2
S Medical device equipment calibration Qualification and Validation (including 21 CFR Part 11) 1
J Scrap Material Scale Calibration Required? IATF 16949 - Automotive Quality Systems Standard 21
S 7.1.5.2.1 Calibration/Verification Records IATF 16949 - Automotive Quality Systems Standard 6
K Is Calibration Required for Non-Adjustable Commercial Inspection Devices? General Measurement Device and Calibration Topics 11
F Calibration in GPC/SEC General Measurement Device and Calibration Topics 1
Q Changing calibration frequency Calibration and Metrology Software and Hardware 18
M IATF 16949 SI # 10: Integrated self-calibration of measurement equipment- Needs for explanation IATF 16949 - Automotive Quality Systems Standard 2
M Storing Calibration Certificate Document Control Systems, Procedures, Forms and Templates 7
B Risk analysis for defective measuring or measuring equipment out of calibration General Measurement Device and Calibration Topics 2
S Placing a calibration sticker with someone other than your initials Records and Data - Quality, Legal and Other Evidence 8
J IATF 16949 Calibration/Verification records question ISO 26262 - Road vehicles – Functional safety 6
M Approval of Calibration Certificates General Measurement Device and Calibration Topics 1
lanley liao Question regarding the calibration of monitoring and measure equipment. Oil and Gas Industry Standards and Regulations 3
N IATF Calibration Lean in Manufacturing and Service Industries 5
Q Do these certificates of calibration meet ISO 9001 requirements for traceability to NIST? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 23
T Plug Gage Calibration Calibration and Metrology Software and Hardware 1
M Load Cell Calibration using a totalizer on a flow meter General Measurement Device and Calibration Topics 0
E Calibration Records needed ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 1
D Limited Range Calibration - 5000 lb Industrial floor scale General Measurement Device and Calibration Topics 3
D Calibration of Small Scales General Measurement Device and Calibration Topics 32
C How to Establish the Calibration & Measurement Capability (CMC)? ISO 17025 related Discussions 1
I IQOQ or just initial calibration required? General Measurement Device and Calibration Topics 3
B Calibration in real life ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
J Calibration cycle for monitoring & measuring tools used in medical device manufacturing General Measurement Device and Calibration Topics 5
A Is calibration of test weight required General Measurement Device and Calibration Topics 4
S Calibration Frequency for Slip Gauge Kit used for CMM Calibration? General Measurement Device and Calibration Topics 0
S Calibration/Verification of customer fixtures IATF 16949 - Automotive Quality Systems Standard 6

Similar threads

Top Bottom