Arithmetic Surface Roughness of Turned Surface
Arithmetic Average Surface Roughness
Arithmetic average surface roughness is defined in Chapter 10. For n discrete measurements of surface distance from the reference height it is
AA = Ra = ( y1 + y2 + y3 ... + yn ) / n
Ra for Turned Surface Profiles
Figure 23-7 shows a lathe turned surface profile if cutting is only done by the tool nose.
When there is more relevant tool shape than just a circular section a more complicated surface profile results. For example, the exercise shows the general profile below.
© 2002 by Barney E. Klamecki all rights reserved.