may have built the next best thing to a better mousetrap-a mini-grader that squeezes through narrow doors but does a big grader job.
And although the world hasn't yet beaten a path to his
says so many contractors are hiring his
machine that he's
building another one.
Laser Grader Early Days
The Original Article As it Appeared
Laser Grader Laser Grading
Leo Paradis of Precision Grading uses his homemade mini-grader
to fine-grade the gravel base for a concrete floor in a commercial building.
At left is the Spectra-Physics Electronic Level which he
uses to guide the
grader's moldboard during the precision leveling operation.
built the machine right from scratch.
It features an 18-hp Cushman golf cart gasoline engine which powers a Vickers six-gailon oil pump and which in turn drives the Charlin hydraulic motor -the primary mover for the entire hydraulic system.
Because of the hydrostatic drive and the gearing he
said the 18 hp is actually boosted to 119 wheel horsepower, giving him all the power and infinite speed he
needs for the job.
The six lever hydraulic controls raise and lower the dozer blade, raise and lower the moldboard, move it laterally and vary the angle of the blade.
The mold board itself is made from a ten-inch-diameter steel pipe, while the cutting blade is a standard manufacturer's piece.
Giving him the precision and production he
The SpectraPhysics ELI Electronic Level he
bought from Waste, Inc.
of Concord, N.H.
The level provides an invisible electronic signal which is picked up by a target sensor mounted on the grader's moldboard.
Set up above the grader's hydraulic controls, and wired to the target sensor, is a remote display which tells Paradis
blade is too high, too low, or on target for the predetermined grade.
"When I first started using the minigrader," he
said, "I didn't have the electronic level.