Roughness Comparison Specimens
Roughness Comparison, EDM, Type 013
- Comparison Standards Type 013
- This comparator scale has 12 specimens of spark-eroded (EDM) surfaces, with roughness values corresponding to nos. 12 - 45 inclusive as specified in the internationally-used guideline document VDI 3400.
- A label on the rear face gives the Ra and Rz roughness values for each patch.
- It is a scale often used by German machine manufacturers
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The Roughness Comparison Specimens are simple to use, inexpensive, and therefore widely used in many different applications. They are great for checking roughness of turned, milled, ground, reamed, polished or lapped parts during machining.
The measurement of surface roughness is not as straight forward as most other engineering measurements, such as length, angle or hardness; and in order to get good accuracy, expensive instruments are needed. These are often unsuitable for workshop use, where roughness of machined surfaces can usually be assessed conveniently and with sufficient reliability using visual and tactile (fingernail) comparison with a standard set of surfaces machined in the same way.
EDM Finish Scale
Type 013
Roughness Comparison, Type 130
Article No: 13132
