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
D Roughness specimen calibration Calibration and Metrology Software and Hardware 2
dhuot1990 General Calibration SOP Manufacturing and Related Processes 3
B Gage calibration Gonogo (calcul of cgk) General Measurement Device and Calibration Topics 0
Vader22 As-Found FAILED calibration ISO 14001:2015 Specific Discussions 16
M Gravimetric blender for resin in automotive industry - periodical calibration via external lab with certification Reliability Analysis - Predictions, Testing and Standards 0
N Calibration Method for Scales and Flowmeters Reliability Analysis - Predictions, Testing and Standards 7
T Calibration Tracking ISO 13485:2016 - Medical Device Quality Management Systems 4
Q Considering addition of mass calibration to ISO17025 scope ISO 17025 related Discussions 6
Z Resolution in calibration General Measurement Device and Calibration Topics 1
J Run Down Adapters Calibration Processes General Measurement Device and Calibration Topics 4
S Looking for accredited calibration lab - Onsite up to 650A and 1 kV. General Measurement Device and Calibration Topics 3
CaliperJim Screw Thread Micrometer Anvil Calibration General Measurement Device and Calibration Topics 7
Strange Juan HP 85054B Standard Mechanical Calibration Kit Calibration Procedure General Measurement Device and Calibration Topics 1
H Air Pressure Gage Calibration General Measurement Device and Calibration Topics 6
T Calibration on AVL AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 4
C Determining an as received OOT condition during calibration does not affect measurements taken prior to calibration. General Measurement Device and Calibration Topics 16
Sam.F Do heat treatment ovens need calibration? General Measurement Device and Calibration Topics 22
J Selecting reference standards for calibration General Measurement Device and Calibration Topics 3
C IATF 16949:2016 Major NC pertaining to 7.1.5.2.1 Calibration/verification records IATF 16949 - Automotive Quality Systems Standard 15
E Calibration Records during AS9100 Audit AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 8
John Predmore Calibration Determination decision Calibration Frequency (Interval) 15
J ISO 17025 Calibration Other Medical Device Related Standards 2
A Electronic Weighing scale calibration Calibration Frequency (Interval) 4
M Bourdon gauge calibration procedure failure ISO 17025 related Discussions 3
Ed Panek Calibration question Manufacturing and Related Processes 4
S Calibration/Worn gages Manufacturing and Related Processes 9
A Settings rings calibration General Measurement Device and Calibration Topics 4
R 7.1.5.2 -- Calibration AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
C CALIBRATION CERTIFICATE REQUIREMENTS General Measurement Device and Calibration Topics 11
S Calibration Label issues General Measurement Device and Calibration Topics 21
H Calibration / Capability in a PCP FMEA and Control Plans 1
R First Time Managing Calibration and Measurement System. Need Help. General Measurement Device and Calibration Topics 19
M CE marked medical device - do they need UKAS certified calibration provider ISO 17025 related Discussions 4
JDJohnson Micrometer & Caliper Calibration (ISO-9001) General Measurement Device and Calibration Topics 26
B Precision Current Loop for Current Probe Calibration Reliability Analysis - Predictions, Testing and Standards 2
Strange Juan Freezers fridges Incubators Calibration Labels General Measurement Device and Calibration Topics 12
D Tolerance and MPEs for Re-calibration Manufacturing and Related Processes 0
D ISO 9001:2015 Calibration Procedures Manufacturing and Related Processes 16
G Calibration of Angle microscope stage micrometer General Measurement Device and Calibration Topics 1
K END CALIBRATION CANNOT BE PERFORMED Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 2
C Gage Block Grade 1 - Calibration Measurement Uncertainty (MU) 15
JoeRandom11 Question of Calibration Cycles AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 8
placebo_master What is the difference between "Fitness for Purpose" and "Calibration/Verification"? General Measurement Device and Calibration Topics 6
G AMS 2750 F Instrument Calibration Results and Recording AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 3
Q Gage calibration in disarray ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 12
R GearBox Test Bench Calibration General Measurement Device and Calibration Topics 2

Similar threads

Top Bottom