How to specify direction of surface roughness measurement

[Sa-Ro]

Hi,

I would like to specify the direction of surface roughness measurement.

Ex: Consider a rectangle: 100 X 50 X 10.

Roughness measurement length: 4 mm

I need 0.8 roughness along 100 and 1.6 along 50 (or) 0.4 for each diameter of 10 mm.

If the probe measures the roughness along 100 side, roughness shall be less than 0.8 for 4 mm.

If the probe measures the roughness along 50 side, roughness shall be less than 1.6 for 4 mm.

If the probe measures the roughness for dia 10, roughness shall be less than 0.4 for each circle..

Standard roughness representation allows to specify the direction of lay (cutting instrument direction). But I need direction of roughness.

Thank you
Sathish Rosario

 

[mfgenggear]

Sa-Ro

Purchase and read this document. so you have data to fall upon,

https://www.asme.org/codes-standards/find-codes-standards/b46-1-surface-texture

 

[Sa-Ro]

Thank you

The said document is described about how to measure surface roughness.

I need how to specify the surface roughness requirements including direction.

 

[Belanger]

Maybe this document:
[URL unfurl="true"]https://www.asme.org/codes-standards/find-codes-standards/y14-36-surface-texture-symbols/2018/print-book[/url]

Though I don't have the newest version, the attached screenshot addresses the direction.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[powerhound]

Sa-Ro,

See Fig. 5-4 in ASME Y14.36-2018. This was one significant change we made to that standard. There is now a way to indicate trace direction. Another significant change we made was that ALL parameters now go under the horizontal bar. That means Ra too.

Also, lay direction is not an indicator of trace direction, it's just a visual specification as to which direction the tool marks, if any, are to be on the part.

John Acosta, GDTP Senior Level

 

[Sa-Ro]

Hi


ASME Y14.36M-1996

4.2 Measurements
Measurements, unless otherwise specified, shall apply in a direction which gives the maximum reading; generally accross the lay.

The standard represents the measurement direction. It gives some idea about how to measure the surface roughness.

Thank you.

 

[Sa-Ro]

Hi


Now I am having ASME Y14.36-1996 version only.

I will get 2018 version and come back.

Thank you.