A Bumpy ride

At Indrotech we feel it our duty to educate the industry on what faults we look for on a problematic driveshaft and how and why we rectify it.

Here is a fault that we find with a typical truck drive shafts.

The fault either comes from neglect to service it, normal wear and tear and believe it or not, even as new from the Original Manufacturer. This fault creates a massive vibration causing failure to the shaft components like; universal joints, centre bearings and even the driveshaft itself. That’s why we always stress that shafts need to run geometrically true to avoid this from happening.

Our first step is to look at the overall concentricity of the assembly starting from the straightness of the tube to the concentricity of the other components welded to either end of the tube. It does get technical and tedious to fix but it must be right, otherwise we come up with the problem that you saw in the video.

The benefit of our procedures is reducing this obvious runout down to 4 thousandths of an inch, equivalent to 1/10th of a millimetre. This is a standard service we practice within our Manufacturing Process let alone our Balancing Procedure.

This procedure helps with our final balancing process that in turn eliminates any vibration in the truck that is caused by the driveshaft. In the video we are running the shaft only at a couple of hundred RPM, imagine what effect it would have running at 3 or 4 thousand RPM. It would be dangerous on the road and more than just a bumpy ride for the driver; it could be catastrophic!

Please refer to our last post so you can see how a shaft, whether a single piece, 2 piece, 3 piece or 4 piece should run. 3 piece driveshaft balancing


Schenck H20 hard bearing balancing

Indrotech Pty Ltd is proud to announce their new addition to their Industrial Balancing facility; a Schenck H20 hard bearing balancing machine backed up with a CAB 590 measuring unit.

Indrotech, Australia’s leader in Industrial Rotational Technologies, Industrial Fans, Industrial Balancing and Driveshafts, have today confirmed this new addition has now been commissioned. The H20 was introduced to the workshop to handle the smaller rotating components that require balancing such as drive pulleys, electric motor rotors, small pump impellers and small turbine wheels of maximum weight up to 50kgs. Having the sensitivity of its ‘big brother’  in the workshop, the H4, it can comfortably achieve grades of balance as low as G0.4 to the ISO Standard.

The key features of this machine are:

  • Selection of 4 speeds;
  • 1500mm long bed;
  • 800 maximum diameter
  • Digital readout;
  • 3“ diameter high speed crowned rollers.

“At the moment, it’s a dedicated direct drive machine. The next step from here is to incorporate a belt drive system. This will allow the work piece to “float” on the rollers eliminating any external drive influences that may compromise accuracy”, said Dennis Eliopoulos Managing Director, Indrotech. “Not that the direct drive system is inaccurate but when we’re balancing light weight, small diameter components, it’s better to belt drive them at very high speed. The bigger diameter components have no issue with direct drive”.

Dennis added that, “the introduction of the H20 now allows us to free up the H4 from the geometrically smaller jobs. This way we can balance more rotors in the equal amount of time. I like this because that’s what my customers want; fast turnaround.


We were fortunate enough to pick up this machine from an ex fan manufacturing company, Flakt Woods who I considered as “the Rolls Royce” of the fan industry…”


It’s a matter of balance

A day in the life of the balancing machine! First up – The Thresher, workhorse of farm equipment, like all rotational equipment if it is out of balance it won’t operate at optimum capacity. The damaged metal fingers get replaced and after a short crane ride it’s ready to go back on the farm.

Next up the delicate blade of a cheese slicer takes its place. The balancing tolerances are a lot finer and extra care is required to bring it into balance.