3 votes
Accepted

Why use a reference volume for leak testing?

Pressures change in a vessel based on ambient conditions. The reference volume removes that source of error.
Tiger Guy's user avatar
  • 6,891
3 votes
Accepted

Identification of bolt material

I imagine you could just cut it in half and look at the boundary under a microscope or loupe. Compare against a known sample that is hot-dipped and one that was cold-dipped. I imagine it should be ...
DKNguyen's user avatar
  • 5,626
3 votes
Accepted

How to resolve file space issue on CDAQ Controller with Labview Test System?

@Mahendra, I had run into Hard Drive Memory Space issue few months ago on my NI cDAQ. I am using cDAQ-9132 with a 16 GB hard drive, similar to your cDAQ. I was running LabVIEW Professional 2017 SP1 ...
Nil_2018's user avatar
  • 350
3 votes
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Gear testing rig

Torque ratings for bevel POM (also called acetal or Delrin) gears are at http://www.huco.com/products.asp?p=true&cat=285 I didn't find timbre boards on google, I assume you meant timber wood ...
Greg Marsh's user avatar
3 votes
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Test UV protection on sunglasses

Your question is a little naive: "Maximum UV protection" doesn't mean much. What you want to know is the spectral attenuation values in the UVA and UVB wavelength bands. The glasses reduce the ...
Carl Witthoft's user avatar
2 votes

Short sample in a 4-point bending test ( ASTM C 393 )

Standards are established for a reason: so that tests are conducted to an established procedure so that the results are comparable. If the standard calls for a length of 150 mm then that is what is ...
Fred's user avatar
  • 9,667
2 votes

Test UV protection on sunglasses

The only real way to test this is to get a stable UV source and a diode that can detect that UV. Measure the relative voltages from the diode with and without the sunglasses, and then you will know ...
PipperChip's user avatar
2 votes

Why does tensile testing in thin films (ASTM D882) require a non-dogboned sample?

ASTM D882 is for plastic films. For thins films of many other materials, dog-bone specimens are more commonly used. The deformation of dog-bone specimens is not homogeneous through the length of ...
Biswajit Banerjee's user avatar
2 votes

How can I determine pressure leakage in a pneumatic system?

Fit a dummy test hose with no leaks - a solid tube for example, then pressurise the system to a known value perhaps the maximum used +10%. Then take readings every 10 seconds / 5 minutes (whatever is ...
Solar Mike's user avatar
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2 votes

DOE analysis or root cause analysis?

Let assume a leak has been reported in the following pump system. As a result there is 1 inch of water on the floor. To identify the failure a root cause analysis (RCA) needs to be performed. To ...
Mahendra Gunawardena's user avatar
2 votes

What height is needed to drop a 72 kg mass to impart a 5000g shock onto a test piece

it depends on how far your steal drop table travels after hitting the sample, the less travel the greater g. The kinetic energy of the drop table when it hits the sample is $$KE=1/2mv^2 \quad and\ v=\...
kamran's user avatar
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2 votes

How should the assignment to test software for a vehicle’s VCU be aproached?

I am not too familiar with the VCU, PV780, or PowerVision. Based on your description PV780 can be configured to be the Instrument Cluster Panel (ICP) for Engine Control Unit/Module (ECM) or ...
Mahendra Gunawardena's user avatar
2 votes

How to resolve file space issue on CDAQ Controller with Labview Test System?

If the built-in storage is fully utilized, there are three other options for saving test data: Save to a network share Save to a USB flash drive Save to an SD card All of these connections are on ...
Joe Friedrichsen's user avatar
2 votes

What ASTM standard would be appropriate for testing the breaking strength of nylon ropes

Go directly to the ASTM site. I put "nylon rope" in search and it said there were 154 possibilities.
blacksmith37's user avatar
  • 6,144
2 votes

Is It Possible To Calculate The Internal Pressure Which A Sealed Glass Vessel Can Support, By Creating A Relative Vacuum Outside The Vessel?

The lowest pressure you can get is zero absolute. Air pressure is about 15psi absolute. The greatest difference you can get across the glass with a vacuum is then only 15psi. If you want to test your ...
Rich's user avatar
  • 191
2 votes

Is it possible to conduct a completely random Quality Test?

Standard 9138 will define your testing requirements Of course there is math available to answer your question. I suggest that because you have a very demanding environment you should only use that ...
Tiger Guy's user avatar
  • 6,891
2 votes
Accepted

Testing specimens by dropping a ball on them and counting the number of drops required before the collapse. A better way?

It sounds like you could modify the procedure and equipment used for a soil standard penetration test (ASTM D1586). In this test, a hammer of specific weight is dropped a specific distant to strike ...
hazzey's user avatar
  • 10.7k
1 vote

C# classes through labVIEW?

The way to do this is to make the build target a dynamic linking library (.dll). Then all you need to do is read up a (relatively) clean application note on how to link to the dll file through ...
NMech's user avatar
  • 24.3k
1 vote

What ASTM standard would be appropriate for testing the breaking strength of nylon ropes

Probably ASTM A931 - 18 Standard Test Method for Tension Testing of Wire Ropes and Strand There are others closely related but not exactly the same. ASTM F3410 - 19 Standard Test Method for ...
NMech's user avatar
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1 vote
Accepted

DOE analysis or root cause analysis?

I think you might be mixing up the intentions of the two analysis tools you you mentioned - Root Cause Analysis and Design of Experiments. Consider thinking of it this way: Root Cause Analysis is ...
Argonax's user avatar
  • 106
1 vote

How to cut Silicone and leave smooth edges?

A laser would be the best method followed by repetitive razor slicing in ever deeper cuts to avoid frictional deformation. Another method would be cold cuts by freezing the silicone and using a ...
Rhodie's user avatar
  • 964
1 vote

Test UV protection on sunglasses

Someone proposed an original method. The result is binary (it doesnt give you a percentage) but it might gives you a rough idea if UV pass through the glass or not: Testing can be one with a ...
JinSnow's user avatar
  • 111
1 vote

Validation of Lightweight Chassis (measuring deflection of structures/strain gauging)

Just seen this, you should set some fixed points, from the floor for example and then you can measure the deflections / changes as you apply the loads to specific points - you don't mention how you ...
Solar Mike's user avatar
  • 15.8k
1 vote
Accepted

What is a method to detect thermal oxide layer after steel is painted?

This article written on May 02 2012 states that no non-destructive methods exist currently, other than a scanning Kelvin probe (which requires long measurement times). However, it states that ...
Jodes's user avatar
  • 1,304

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