ACCURACY vs PRECISION in manufacturing - explained

This is the best explanation to illustrate Accuracy vs Precision. In this video Star Rapid's CEO Gordon Styles illustrates the difference between highly precise mechanism producing less accurate part, and less precise mechanism producing highly accurate part.

Recent Videos:

At Star Rapid, we provide high-quality prototyping, rapid tooling and low-volume manufacturing services to support your product development needs.

Our international team of engineers work with you to make your product ideas a reality through manufacturing technologies like metal 3D printing, vacuum casting, CNC machining, plastic injection molding and a range of finishing services.

Rapid Prototyping Service at Star Rapid:

Visit us:

Subscribe to us here:

Official Website:

Find us at:

Facebook:

Instagram:

Twitter:

Work with us:

Are you a reader?

#precision #accuracy #engineering

This is an engineering show for engineers and product developers.

[MiklaDfar]

Precision is simply how repeatable a process is (e.g., throw darts that hit the same spot every time).
Accuracy is the ability to obtain a specific value or target (e.g., throw a dart and hit dead center in the target).
Combined will allow for a repeatable process that hits the target every time within a prescribed parameter (e.g., multiple thrown darts all hit the bullseye).

[Ivan_builds]

Respectfully, I think you've got it wrong!
You seem to be discussing two things at the same time: the manufacturing processes of the fixtures, and the resultant data set of paint stripes, so I'll address them both:

1) The CNC fixture is precise and also very accurate (to the dimensions programmed into the CNC).

2) The cast piece is very accurate, but imprecise.

3) The paint which comes from the cast fixture is always in the correct location, in a tight grouping, which means the paint from the cast fixture is ACCURATE AND PRECISE.

4) Now, unless the designer made the CNC fixture asymmetrically in such a way that the painted stripe is always to the SAME side by the same amount, the paint stripes probably come out randomly to the left a little, or to the right a little, and sometimes you get lucky and it comes out right down the middle, probably because the fixture part profile allows just a little movement of the widgets when they're clamped inside. If you paint 10, 000 widgets in that fixture, and aggregate the data from the paint stripes, you would find that they follow a normal distribution. So the average location of a large sample of paint stripes is likely right in the center. This means that the paint which comes from the CNC fixture is ACCURATE but NOT PRECISE.
**Unless you always set the fixture on one side, which would bias the data and make it inaccurate.

[bantodacapo]

How is that copper part is made ? Can u make a video for that please 🙏🏻🙏🏻🙏🏻

[paulbaird]

We call that a book mask in my industry. They're wonderful little contraptions.