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  #1  
Old 09-15-2006, 11:00 AM
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Default convert surface finish - Rz to Ra

I need to convert an Rz surface spec to Ra. Please and thanks in advance.
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  #2  
Old 09-15-2006, 09:56 PM
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Default Re: convert surface finish - Rz to Ra

I found a page with much information on this, its a good read.
http://www.mmsonline.com/articles/1102gage.html

It says, if the manufacturer uses Rz and the customer uses Ra then a ratio of 4 to 1 or 7 to 1 is ok. But if the manufacturer uses Ra and the customer uses Rz the ratio will be higher, up to 20 to 1.
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Old 05-23-2007, 03:54 AM
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Default Re: convert surface finish - Rz to Ra

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I need to convert an Rz surface spec to Ra. Please and thanks in advance.
PLS convert 12.5Rz to Ra.
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Old 07-05-2007, 02:47 AM
pungal
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Default Re: convert surface finish - Ra to Rz

pls. convert 12.5ra to rz,

pls.convert 6.3Ra to Rz
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Old 07-05-2007, 03:29 AM
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Default Re: convert surface finish - Ra to Rz

pls.convert 6.3Ra to Rz,

pls.convert 12.5Ra to Rz
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Old 07-06-2007, 08:37 PM
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Default Re: convert surface finish - Rz to Ra

There is no direct conversion. Try following this link:

Quote:
Originally Posted by Robert Fogt
I found a page with much information on this, its a good read.
http://www.mmsonline.com/articles/1102gage.html

It says, if the manufacturer uses Rz and the customer uses Ra then a ratio of 4 to 1 or 7 to 1 is ok. But if the manufacturer uses Ra and the customer uses Rz the ratio will be higher, up to 20 to 1.
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  #7  
Old 08-17-2007, 09:40 PM
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Default Re: convert surface finish - Rz to Ra

need Rz 60 in Ra
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  #8  
Old 08-17-2007, 09:47 PM
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Default Re: convert surface finish - Rz to Ra

I need to convert an Rz10 surface spec to Ra. Please and thanks in advance
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  #9  
Old 11-06-2007, 02:41 AM
ABHIJIT DUTTA
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Default Re: convert surface finish - Rz to Ra

Quote:
Originally Posted by Unregistered
I need to convert an Rz surface spec to Ra. Please and thanks in advance.
Rz 2.5 = ? Ra
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  #10  
Old 01-08-2008, 11:39 AM
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Default Re: convert surface finish - Rz to Ra

Assuming Rz DIN verses Rz ISO
Conversion factor = 7.2

Ra = Print Rz / 7.2

If print is in metric micrometer and you want english microinch equivalent
then ...

Ra = (Print Rz / 7.2) x 40

example: Print states 6.3
Ra = 6.3 Rz / 7.2 = .87 Ra micrometer
or
Ra = (6.3/7.2) x 40 = 35 Ra microinch


Popular conversion factors:

Rz Din = 7.2
Rz ISO = 7.6
Rmax = 8.0
RMS = 1.1
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