Testa nodi -Dinamometro

Patented 102018000009623

A maniacally well done knot does not weaken the resistance of the thread on the joints, the problem is that sometimes, unfortunately, not all knots are well made .... Think to make a fishing trip sometimes dozens of kilometers and then miles again navigation to reach the ideal spots, thousands of euros are spent on sophisticated equipment, echo sounders, reels, fishing rods and expensive all kinds of small parts, without thinking about the cost of the boat and the fuel needed, and then in the most beautiful ... Our thread gives way to a bad knot and maybe that was the only fish that took the bait all day long!

Of course it is also useful for testing the shock leader in surfcasting, or any other knot or junction, sleeve, thimble, swivel, hook, etc., as well as testing the actual breaking load of the line and the relative elasticity.

The thread is wound a few turns around two oval jackets made of soft rubber and then pressed onto the rubber base below and is not stressed or dented, once the test has been carried out the wire recovers its linearity.

The electronic scale is not supplied by us as there are numerous versions and models with different capacities, tolerances, reading speed and precision, applicable to our dynamometer / knot head, you can buy it directly as it is not supplied by us, below you will find some link.

Because it is important to test the node:

Many of us have the habit of calibrating the friction of the reel (and consequently the joints made) with the classic spring scale, some with the bucket of water, others hooking the hook to the net of a gate and pulling the barrel horizontally , But physics also says more ...

FXB = R
Strength for the arm = Strength or torque,
In order not to have rotation, the strength for the arm is balanced by the resistance / torque.

To better explain in the image below we indicate:

As a resistance to rotation / torque the calibrated friction of our reel.

The arm that would be the radius of the coil of the wound wire, which when full has the maximum radius, as the wire comes out the radius decreases accordingly.

The strength of the fish (blue color) that acts tangentially to the diameter of the wound wire.

This principle applies to both rotating and fixed reel reels.

We put on a trolling / big-game reel size 50LB on average when it is full the outer diameter of the wire spool is about 8 centimeters, the clutch is usually calibrated around 9/12 kg usually weight.

We calibrate the clutch when the coil is full, if we calibrate it like 10 kg., For the physical formula FxB = R we would have a resistance / torque given by 10x4 of arm = 40kg / cm, and this value remains constant until it is we touch the clutch.

When we put the rods into trolling, bolentino fishing or after the first escape of the fish, the outside diameter of the wound wire decreases considerably, even half the example becomes 4 cm, and therefore the arm B = becomes 2cm. Closing all the clutch preset to 10kg.ora the tangential force of traction of the wire to balance the torque of 40kg / cm is not more than 10 kg but will be 20kg (formula FxB = R, to obtain F you have to do R / BR = it was 40, divided by the arm B which is now 2 cm) the DOUBLE, in addition to the resistance of the thread that cuts the water, so your knot is very important to resist much more than the test done with the clutch closed ... and full coil!

JUNCTION TEST BETWEEN TWO WIRES

 

FUNCTIONALITY TEST:

THIS MEANS THAT ACTUALLY THE MEASURED TRACTION IS EQUAL

TO THE ACTUAL EXERCISED ON THE WIRE.

FOR TESTS OF THE WIRES IN NAYLON, FLUOROCARBON, THE VALUES DEPEND DEPENDENTLY ON THE SPEED IN WHICH THE TEST IS CARRIED OUT, EXAMPLE QUICKLY TURNING THE HANDWHEEL OFF THE MOLECULES HAVE LITTLE TIME TO GO AND THE BREAKAGE VALUES ARE GREATER AND NEXT TO THOSE DECLARED BY THE MANUFACTURER DEL FILO (THE MOST RELIABLE AND TRUTH), TYPE 30lB ANDE VERY WIDTH AT 14.80 KG. (Does not exceed the 15Kg limit)

MAKING THE TEST SLOWLY AND GIVING YOU WANT TO UNDERSTAND THE BREAKAGE VALUES ARE LOWER BUT ACTUAL EXAMPLE THE SAME 30lB ANDE VERY WIDTH 13.65 (value close to what stated by the manufacturer)

Please note that all the scales have a more or less precise tolerance, some have an error of + or- 80 grams, another 200 grams.

Approximately to have approximate values to the official tests that the manufacturers do (iso 2062 procedure), which involves traction of a test tube with a length of 500 mm, with a speed equal to 100% of the length per min (500 mm / min) enough regularly rotate the handwheel by one revolution per second, which is equivalent to 480 mm / min of speed, even if there would then be a pretensioning, the humidity of the product, the ambient temperature and a series of tests to then make the average.

We paste the link of these scales that we have tested and have an affordable price / quality

You can buy it directly as it is not supplied by us.

http://www.pce-italia.it/html/dati-tecnici-1/bilancia/bilancia-di-gancio-pce-hs-50.htm

There are two versions, one that weighs up to 150 KG. with precision 200 grams, and another up to 50 kg with a resolution of 20 grams and accuracy of 80 grams.

They also have the PEAK function (ie they read the value every half second) and automatically memorize the maximum value detected, convenient but not essential to test the mechanical strength of the wires before they break.

This is another balance of decent quality

à  https://www.amazon.it/gp/product/B079P8QWWD/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

 

others even cheaper are unreliable, bust the value of even a few kilograms ....

TEST binding hook - swivel

It is made of aluminum, nylon and stainless steel, the sliding joints are in hardened steel and recirculating ball guides that do not make any friction, 100% reliability of the measurement.

TO TEST THE BRAID ULTRARESISTENT it is advisable to remove the upper rubber rings, avoiding sawing them (if you wish you can replace them autonomously with the need for a bike air chamber strip)