THINK OUTSIDE THE PYRAMID
Most forklift instructors understand sit-down counterbalance construction and how the basis for the "stability triangle" can be explained and plotted.
But how do you explain this geometric relationship to a student who may have been away from school for a long time? And how do you use this information and skilfully extrapolate to a three-dimensional, three-sided pyramid?
I have seen references to polyhedrons, tetrahedrons, isosceles triangles and other technical terms in operator training manuals, but they are often used incorrectly. Perhaps it is better to keep it simple. Most operators are familiar with triangles and pyramids but still have trouble with the three-dimensional aspect of the relationship.
A large, low-detail forklift model with strategically-placed rubber bands can be phenomenal in bringing understanding to the student. I also recommend that the vertical sides of the pyramid be described as "lines of stability".
Another major challenge for instructors is to engender true comprehension of the centre of gravity. Three-dimensional thinking is of utmost importance in the operation of a forklift and the visualisation of C of G is a challenge.
Most students say they understand but, when tested, often confuse the C of G with something else. Again, using a model of some kind is very useful. I use movement of the human body as a test of retention.
Contact me for more information on this important area of forklift instruction.
Many readers enjoy having a quiz at the end of my articles. Here are some more questions:
1. Is the stability triangle equilateral or isosceles?
2. Do the geometrical stability shortcomings of the forklift apply to some cars as well?
3. Do the geometrical stability shortcomings of the forklift apply to other types of machinery as well?
4. Will a forklift lift 0%, 10% or 50% more than its rated capacity?
5. Many training companies incorrectly describe the stability triangle on a reach truck. How should it be drawn?
If you do not know the answers, please ask your trainer. If he/she doesn't know, find one who does.
Be safe. Save money.
Wayne Chornohus is a forklift consultant with Hunter Industries Ltd. He brings more than 20 years' experience in the forklift and training industries to the Forkliftaction.com community.