How to Convert Rz to Ra

How to Convert Rz to Ra thumbnail
All surfaces have peaks and valleys that are too small for us to see.

Both Rz and Ra express how smooth the finish of a surface is. However, the two do not measure precisely the same things. Rz measures the average height distance between a set number of the highest peaks and valleys on the surface. Ra imagines that you could level all the peaks to fill in all the valleys to come up with a theoretical mean surface line. Ra is the average deviation from the theoretical mean of the peaks and valleys. Even though Rz and Ra measure different things, it is possible to do a rough conversion between the two with simple math. Does this Spark an idea?

Things You'll Need

  • Calculator
Show More

Instructions

    • 1

      Enter the Rz value in your calculator. For example, press the "9" key.

    • 2

      Divide the Rz number by 7.2. For example, press the "/" button, then enter "7.2." 7.2 is the factor needed to get an approximation from Ra to Rz. So, if you already have the Rz, you divide by 7.2 to get the estimated Ra.

    • 3

      Press the "=" button to get a rough estimate of the Ra. For example, 9 Rz roughly converts to 1.24 Ra.

Related Searches:

References

  • Photo Credit chairs & table image by timur1970 from Fotolia.com

Comments

You May Also Like

  • How to Convert Surface Finish From Metric to English

    Surface finish has a significant impact on the frictional properties of a surface. It is usually described as rough, glossy or smooth....

  • Rmax Surface Finish Definition

    There are other methods of measuring roughness, such as Ra, Rz, Rp, Rq, Rx and Ry, though the most common method is...

  • How to Convert Real Audio to Burn on a CD

    Real Network's Real Audio files are optimized for storing high-quality audio and video streams in Web-efficient packages. And while Real Audio is...

  • How to Be a Good RA

    During the late summer months, students around the world leave for college. Many of these college attendees choose to live in on...

  • What Is Surface RA?

    Surface RA stands for "Roughness Average" and is a parameter used to measure the surface texture of a material. According to the...

  • What Is an RA Number?

    A return authorization number is a number that companies issue to authorize you to return an item. If you've received a defective...

  • How to Convert RA to MP3

    The Real Audio (RA) file type is the native file format for the RealAudio players. RA files can be converted to MP3...

  • Definition of RV Classes

    There are various types of recreational vehicles (RVs) made for camping. Some models are suitable for short camping trips, while others provide...

  • How to Be an RA

    When you take on the responsibility of a resident assistant at a college dorm, (sometimes called a preceptor or resident adviser), you...

  • How to Build Your Own RV

    If you want a recreational vehicle with your own personal touch, you can look to build your own RV instead of purchasing...

  • How to Buy an RV

    Decide on which class vehicle is right for you. Class A motorized models are the largest. Class B motorized models are modified...

  • How to Cope With RA

    Rheumatoid arthritis (RA) is a recurring inflammatory disorder that usually involves the small joints in your hands and feet. RA occurs in...

  • How to Convert PMS Colors to Embroidery Thread

    Embroiderers are often asked to match corporate colors in sewing identity elements to clothing and it can be time consuming to manually...

  • How to Rejet the Carburetor on a Motorcycle

    If your motorcycle is running lean, one idea to consider is to rejet your motorcycle carburetor. Putting in larger jets will give...

  • How Do I Calculate Scallop Height & Surface Finish?

    Scallop height and surface finish are two measurements that are used for characterizing surfaces, particularly when the surface is created using a...

  • How to Convert Pitch Rate to Angle

    A slope may be expressed as a ratio of the height gained over a set distance. For example, a roof that gains...

  • What Is the Nutritional Value in Ramen Noodles?

    More and more pantries seem to be filled with ramen noodles these days. Parents and kids alike love them because they are...

  • Surface Finish Methods

    Surface Finish Methods. Surface finishing is a process for treating wood, metal and other materials to give them the desired texture and...

  • How to Read Surface Finish Data

    These days, we expect consumer products to have a smooth and sleek design. You might call it the ipod syndrome. This increased...

Related Ads

Featured