Re: [MW:13295] Surface roughness measurement instruments.

Dear Experts

I understand from mails of all group members that Surface roughness can be measured with suitable comparator.

However if we want roughness value exactly to be measured, we can ask dial gauges/ digital instruments / Press "O" films etc.

if anybody have other opinions, pl. share the same.

Best regards

Rao.

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From: Pieper QSI <info@pieper-qsi.nl>
To: materials-welding@googlegroups.com
Sent: Saturday, 24 December 2011 1:07 PM
Subject: RE: [MW:13287] Surface roughness measurement instruments.

Dear Mr. Rao,

 

In my previous e-mail I mention that SA is roughness but that was wrong. As already mentioned by some other members SA is cleanness of surface after blasting. Unit for roughness is Ra or Rz, two different values, one measures an average roughness the other the maximum roughness, value to be used should be mentioned in the contract / coating specification. Both Ra and Rz will be measured in microns.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens Vasantharao
Verzonden: vrijdag 23 december 2011 13:31
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:13281] Surface roughness measurement instruments.

 

Dear Mr.Pieper

 

Thank you for your info.

 

Could you pl. give the units for measuring the surface roughness. As per my client spec. it is mentioned as microns only.

 

I think surface appearance after blasting should be SA 2 1/2 or SA 3 and should not be measured in microns.

 

thank you

Rao

 

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From: Pieper QSI <info@pieper-qsi.nl>
To: materials-welding@googlegroups.com
Sent: Friday, 23 December 2011 2:07 PM
Subject: RE: [MW:13277] Surface roughness measurement instruments.

Dear Mr. Rao,

 

Be aware that the microns you mention is not the surface roughness but the coating layer thickness (DFT = Drie Film Thickness).

For surface roughness you will have values like SA 2,5 microns or similar and in practice mostly the comparators are used for inspection prior to first layer of coating.

After fist coating layer there is no need to measure the roughness anymore.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens jsrisud@gmail.com
Verzonden: donderdag 22 december 2011 14:45
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:13259] Surface roughness measurement instruments.

 

Dear Mr. Rao,

There are portable surface roughness measuring instruments to measure as required.

UK based Rank Taylor Hobson instruments are available in India.

Srinivasan

Sent from BlackBerry® on Airtel

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From: Vasantharao <vasantharao@yahoo.in>

Sender: materials-welding@googlegroups.com

Date: Thu, 22 Dec 2011 15:38:40 +0530 (IST)

To: materials-welding@googlegroups.com<materials-welding@googlegroups.com>

ReplyTo: materials-welding@googlegroups.com

Subject: [MW:13256] Surface roughness measurement instruments.

 

Dear Experts,

 

I work as inspection Engineer. When i go for Blasting inspection, contractor provided  me profile comparator for surface roughness measurement.

 

Contractor do  Grit blasting in the shop.

 

I need to measure surface roughness  -  75-100 microns      Painting system No#1

                                                            50-75 microns        Painting system No#2

Queries

Q 1: Comparator is enough for surface roughness measurements.

 

Q2: Is any other tools available for roughness measurement?.

 

Q3:  What is the normal industry practice.


Pl. provide your valuable suggestions as i'm new for painting activities.

Rao.

 

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

 

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.