New Technology For Bolted Joint
Design Over 50 web pages on torque, tension,
& bolted joints.
New DSP technology, PC technology, and
ultrasonic technology combine to more reliably measure actual bolt tension,
not just bolt torque. A nondestructive testing (NDT) technology. See
Here is a
new technology for an engineer, flange designer, or bolted joint designer.
Verify your design. This
new DSP technology helps in the following areas of bolted joint
Update says: " SureBolt outperformed the one-point bolt gauges
on every bolt and every test in reliability and accuracy."
1. Bolts that fail. What new technology
can help engineers avoid bolt failures? Bolt experts say "lack of pre-load
tension is the number one reason for bolted joint failures. But, isn't tension
directly related to torque? NO! Torque is directly related to friction. What factors
tension errors (Spiralock quote)? Can new technology help?
2. Bolt torque = bolt
tension? NO! You want tension not torque. You want to put a known amount of tension
into your nut/bolt combination, not just a known amount of torque. Structural analysis
calculates proper pre-load tension. SureBolt is a new technology that lets
you measure pre-load tension more reliably.
3. Measure tension errors more reliably. How can this
new technology measure torque wrench tension errors?
Do these bolt tension errors matter? These errors often
affect a mechanical engineer's structural analysis.
4. Use a bolt gauge. Your bolt's tension
can be verified using a bolt gauge. What is an ultrasonic bolt gauge? See an animated demonstration of
an ultrasonic echo inside of a bolt. Engineering labs
rarely have enough resources to let each engineer learn ultrasonics.
Are bolt gauges reliable? Are they easy to use? New
patented technology has finally made ultrasonic bolt gauges reliable and easy
5. Friction causes 80-90% of the torque. Mechanical engineers know
that bolt & nut friction consume over 80% of the torque measurement.
But, how does the actual tension vary bolt to bolt?
What if you use the same type of bolt?
6. Stress, strain & yield. A stress strain curve can be plotted using SureBolt. Stress strain
and yield. SureBolt's new technology can help a engineer verify
his bolted joint
design. Did his bolt reach yield?
7. Flange bolts vary more. Flange joints sometimes leak. Why does the tension in a flange bolt
vary so much, bolt to bolt? How can you tighten each flange bolt to closer tolerances?
How can you use SureBolt on a flange?
8. SureBolt technology. Read why NASA
used SureBolt technology on Space Station. What did NASA find out? How does SureBolt differ from any other ultrasonic bolt
gauge? What is the difference between a one-point bolt gage and SureBolt's
patented whole echo method? Are the prices similar? (Yes)
9. Engineers. Some engineers use a strain gauge to measure bolt tension because
they know a torque wrench is not directly measuring tension.
SureBolt's Whole Echo
patented technology greatly increases the reliability by using the
patented whole echo method, instead of just one point.
All other bolt gages use just "One
Point" (one zero crossing), that leaves you susceptible to peak
jumping (20% or more error). Surebolt is a more reliable bolt gage due to
this new patented technology. See comparison table.
Bolt gages have been around for over 20
years. Their "Peak Jumping"
problems and difficult learning curves, have kept them from being widely used. When your bolted joint
fails or flange leaks, then you find out your one-point bolt gage may have
Example, with a lot of training and laboratory testing, NASA has used bolt
gages for years. NASA physically takes Polaroid pictures of the echoes
before and after tensioning. Then they use their trained human
experience to determine if the echo has distorted
"too-much". Even after all
this, they have to throw away approximately one third of the ET
measurements because they are not reliable. When NASA used the
SureBolt prototype, no measurements had to be thrown away.
SureBolt gives you a 13.3" TFT, portable PC
(Panasonic Toughbook Model 72). The ultrasonic pulser and digitizer are built into the CD ROM
and PCMCIA slots. Click here to see
the actual SureBolt screens. See the animated DEMO page
to see how an ultrasonic bolt gauge can measure tension. SureBolt has been used
on different bolts from the special high strength titanium bolts, to the standard "off the shelf"
Time". See animation below of how to ultrasonically
measure the change in bolt tension using echo time.
This animation requires FLASH
(version 4 or higher).
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No more guessing as to
which "one point" is the right point.
The FIRST whole
echo method (patented DSP Technique).
Built into a
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September 27, 2011