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#1
09-15-2006, 12:00 PM
 Unregistered Guest Posts: n/a
convert surface finish - Rz to Ra

I need to convert an Rz surface spec to Ra. Please and thanks in advance.
#2
09-15-2006, 10:56 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,414 Rep Power: 12
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.
#3
05-23-2007, 04:54 AM
 Unregistered Guest Posts: n/a
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.
PLS convert 12.5Rz to Ra.
#4
07-05-2007, 03:47 AM
 pungal Guest Posts: n/a
Re: convert surface finish - Ra to Rz

pls. convert 12.5ra to rz,

pls.convert 6.3Ra to Rz
#5
07-05-2007, 04:29 AM
 pungal Guest Posts: n/a
Re: convert surface finish - Ra to Rz

pls.convert 6.3Ra to Rz,

pls.convert 12.5Ra to Rz
#6
07-06-2007, 09:37 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,414 Rep Power: 12
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.
#7
08-17-2007, 10:40 PM
 Unregistered Guest Posts: n/a
Re: convert surface finish - Rz to Ra

need Rz 60 in Ra
#8
08-17-2007, 10:47 PM
 Unregistered Guest Posts: n/a
Re: convert surface finish - Rz to Ra

I need to convert an Rz10 surface spec to Ra. Please and thanks in advance
#9
11-06-2007, 03:41 AM
 ABHIJIT DUTTA Guest Posts: n/a
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
#10
01-08-2008, 12:39 PM
 Unregistered Guest Posts: n/a
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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