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Technical Discussions
anjafo79
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo79

NDT Inspector
Norway,
Joined Aug 2009
204
22:06 Dec-18-2013
making ndt calibration samples

what machines would you recommend for doing SDH, FBH, Notch on your own, small simple even portable solutions?

any suggestions?



 
 Reply 
 
Albert
Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation, USA, Joined Jun 2012, 140

Albert

Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation,
USA,
Joined Jun 2012
140
02:29 Dec-19-2013
Re: making ndt calibration samples
In Reply to anjafo79 at 22:06 Dec-18-2013 (Opening).

Make friends with a machinist.

 
 Reply 
 
anjafo
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo

NDT Inspector
Norway,
Joined Aug 2009
204
08:37 Dec-19-2013
Re: making ndt calibration samples
In Reply to Albert at 02:29 Dec-19-2013 .

For SDH but can they cut Notches?
I also have a few fabrication shops with laser/water bed cutters but I wonder on anything small in house we could use?

 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 526

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
526
13:53 Dec-19-2013
Re: making ndt calibration samples
In Reply to anjafo at 08:37 Dec-19-2013 .

It depends what you are trying to achieve.

In our application work we often need to create 'defects' and a variety of small tools - pillar drills, Dremels, small hobby type mills etc are often quite adequate for proving feasibility.

but when you are trying to make calibration samples or something that is accurate, you can have the best equipment in the world and still produce garbage. Machining is a skilled job and producing accurate results needs experience. I've been dabbling in this for nearly 40 years and I would never try and do anything that 'had to be good' myself.

As Albert says, find someone who knows what they are doing. Its the only sensible way

Joe


 
 Reply 
 
S V Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S V Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
14:48 Dec-19-2013
Re: making ndt calibration samples
In Reply to Joe Buckley at 13:53 Dec-19-2013 .

I have been following the discussion with interest. We were fortunate in having excellent workshop / toolroom and also inspection facilities to validate the dimensions and surface finish etc. of the discontinuities produced.

If such facilities are not available, it may be better to go for such calibration standards made by professional suppliers.

 
 Reply 
 
albert
Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation, USA, Joined Jun 2012, 140

albert

Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation,
USA,
Joined Jun 2012
140
16:02 Dec-19-2013
Re: making ndt calibration samples
In Reply to anjafo79 at 22:06 Dec-18-2013 (Opening).

I have a PDF file I found in the ether of the internet that covers the topic that I will look for and either post it here or email it to you.

It your just "messing" with it and I take it your using UT.

Notches- you can use a hacksaw, jewelers saw, for rectangular notches, a corner of a file for V shaped notches.

SDH- basically just drill a hold thru your sample

FBH- these are a bit tricky by hand, you can start out with a drill bit, then flatten out the bottom of the hole with a different bit, or take the existing bit and grind the tip flat, but they are probably going to snap.

with all of the above the surface finish of the notch, walls of the SDH and end of the FBH are very important to control for a good test.

Post a little bit more about what your trying to do, and with what, so you can get more on target answers.

 
 Reply 
 
Phil Herman
Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards, USA, Joined Oct 1999, 79

Phil Herman

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
21:32 Dec-19-2013
Re: making ndt calibration samples
In Reply to anjafo79 at 22:06 Dec-18-2013 (Opening).

As we say in the States, "Don't try this at home." Trust the professionals. Would you consider performing your own surgery based on advice from the web?

 
 Reply 
 
Manuel Haces
Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection, Mexico, Joined Jun 2002, 124

Manuel Haces

Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection,
Mexico,
Joined Jun 2002
124
23:50 Dec-20-2013
Re: making ndt calibration samples
In Reply to Phil Herman at 21:32 Dec-19-2013 .

Well said, trust professionals.

 
 Reply 
 
Albert
Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation, USA, Joined Jun 2012, 140

Albert

Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation,
USA,
Joined Jun 2012
140
08:08 Jan-03-2014
Re: making ndt calibration samples
In Reply to albert at 16:02 Dec-19-2013 .

Here you go.

http://www-pub.iaea.org/books/IAEABooks/6192/Guidebook-for-the-Fabrication-of-Non-Destructive-Testing-NDT-Test-Specimens

 
 Reply 
 
anjafo
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo

NDT Inspector
Norway,
Joined Aug 2009
204
22:13 Jan-03-2014
Re: making ndt calibration samples
In Reply to Albert at 08:08 Jan-03-2014 .

Thanks for comments and wonderful link.
Trusting the professionals probably wisest and for amount of orders possibly not worth investing but...

I have seen some really nice table top metal (laser?) etchers that burn down a few mm now and getting better and a slightly bigger machine can get depth required. Also table top lathes not running at massive costs and small welding machines are very common.

These can be used for other things inspectors will find handy, such as making optimizing tools, in house repairs etc.




 
 Reply 
 
Albert
Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation, USA, Joined Jun 2012, 140

Albert

Other, ASNT NDT Level III (MT, PT, UT and ET )
Aviation,
USA,
Joined Jun 2012
140
23:12 Jan-03-2014
Re: making ndt calibration samples
In Reply to anjafo at 22:13 Jan-03-2014 .

No worries, just use the material responsibly.

You'll find that to make a proper workable standard will probably not be worth the trouble.

I often made my own defective work pieces when I started out just to help me better understand a particular method and system response.

IE

UT, difference in amplitude of a FBH and a hole that was made with a regular drill bit (conical tip)

MT, Press fits with several nuts on a threaded bar and response via direct and induced magnetism

PT, take the threaded bar and grind a side of it really well just to obscure the separation between nuts and process it and see the kind of indication it produces.

ET, how two sheets of a conductive material will flat edges pressed together simulated a infinitely deep crack in relation to SDP

The first NDT test I ever performed (MT and PT) was on a knife I had purchased that years later cracked where the heaviest grinding was performed, I never used the knife. But that was a perfect example of how excessive press while grinding cause a residual stress that wasn't relieved during heat treating of the blade, and since it was ferrous I was able to identify it via PT and MT.

 
 Reply 
 
vijayaraghavan.P
Consultant,
Freelance consultant, India, Joined Dec 2009, 12

vijayaraghavan.P

Consultant,
Freelance consultant,
India,
Joined Dec 2009
12
13:51 Feb-16-2014
Re: making ndt calibration samples
In Reply to Albert at 23:12 Jan-03-2014 .

Vague answers like, Make friends with a machinist, go for such calibration standards made by professional suppliers will not help.
Following are the technical aspects to be considered for calibration / test blocks.

Ex for a UT block , Material, Drilling of FBH by EDM, Checking of flatness as per ASTM standards, Tracebility to international standards . with all this sometimes there are chances of getting ncrs during audit. Specifications shall be clearly defined to the block manufacturer and it should be verified after receiving it which is performance test.

 
 Reply 
 
David Baeley
Engineering,
Australia, Joined Dec 2014, 17

David Baeley

Engineering,
Australia,
Joined Dec 2014
17
07:10 Jan-31-2015
Re: making ndt calibration samples
In Reply to anjafo79 at 22:06 Dec-18-2013 (Opening).

I suggest oil drilling rigs tools for use and drilling equipments.

 
 Reply 
 

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