Quality systems used at Basin include:
Basin Precision Machining has been committed to lean manufacturing since the introduction of the “Goal” in the early 1980s. At Basin Lean is a journey of continuous improvement.
Corrective and Preventive Actions (CAPA)
These are implemented in response to a suspected deviation from one or more of the Basin Quality Systems. Sources of the deviation may stem from a potential customer problem or complaint, unacceptable levels of product non-conformance, issues identified during an internal audit, or adverse or unstable trends in product and process monitoring as would be identified by statistical process control.
Six Sigma Methodology
To further focus on efficiency, Basin Precision has begun the implementation of Six Sigma. Operations at Basin are led by a Six Sigma Black Belt. We are measuring, analyzing, and improving our business processes to better serve our customers.
Statistical Process Control
The most current statistical methods are used to analyze our processes, assuring the highest quality product is produced and the robust, repeatable manufacturing process chosen remains stable and unchanged. Advanced process planning including Process FMEA and full PPAP submission are available to guarantee a smooth start up to the most difficult projects.
SPC dimensions are recorded and used in Basin’s CNC Manufacturing lines to provide continuous monitoring of our Product process and ensure that it will continue to operate to its full potential. At its full potential, the process can make as much conforming product as possible providing a minimum of waste.
SPC is applied to any process where the “conforming product” (product meeting specifications) has output that can be measured. Key tools used in SPC include control charts; a focus on continuous improvement and the design of experiments.
Because of the level of detail of measurement that precision machining provides it is relatively easy to recognize the variation occurring in any process. Monitoring this capability through SPC allows us to recognize if changes in measurement are due to:
- “Common Causes” – This is normally an expected source of variation that consistently acts on a process but still produces a stable and repeatable distribution over time or
- “Special Causes” – sometimes referred to as assignable sources, these are factors causing variation that affects only some of the process output and is often intermittent and unpredictable. The goal of SPC is to find these changes and their source in a timely manner so that the process can be corrected.
Precise Calibration Systems
This is vital in ensuring that Basin’s measurements & testing are accurate and reliable when making quality decisions. Here are few important concepts that should be understood, considered and applied to the measurement Process used.
Accuracy & Bias is the closeness of agreement between the average observed measurement value and an accepted reference standard’s value.
Precision is often described as the ability of a measurement method to replicate a given result.
Repeatability is the error/variation when measuring the same part/feature several times. This type of error might include the part setup, part size, linearity of the equipment and the variation associated with the measurement system.
Reproducibility is the error/variation when measuring the same item utilizing different operators. This variation captures the human factor associated with the measurement error.
Linearity is defined as the variation in a measurement system throughout the range of expected capable measurements. Example: when 2 different critical dimension on a particular component are measured and the first critical dimension is the thickness (.025″) of the part and the other is the diameter (12.000″). Linearity is the concept that at the .025″ dimension, the measurement instrument (Caliper) might be more accurate then when the same tool measures the diameter at (12.000″)
The correct Inspection and Measurement process is a critical part of ensuring outgoing quality. Our quality technicians are entrusted with ensuring that the measurement equipment chosen is appropriate to the Part’s Control plan and is calibrated to perform the task.
At Basin the team member responsible for management of the product’s work cell will perform all direct in-process dimensional checks. In the effort to choose the correct Measurement System, or analyze an existing one, Measurement System Analysis is also very important.
Assurance & Calibration Risk Control
Risk control, as it concerns calibration management, includes understanding what the risks to the organization are and how they are defined and presented.
To avoid Measurement Risk our quality lab maintains the equipment required to verify the precision capabilities of the gauges used for each inspection plan. Instruments working at peak performance help maximize productivity, profitability and meet regulatory requirements.
When additional dimensional confirmation of part accuracy is needed, 4 Zeiss Coordinate Measuring Machines are available to establish evidence that this accuracy has been accomplished.
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