FF/FL Testing
Fmin Testing
Corrective Grinding
navigation close
Allen Face Europe>

Corrective Grinding

Grinding bad floors into tolerance inexpensively

Our fast and inexpensive corrective grinding technology helps you convert any existing concrete floor into a Superflat Defined Traffic Floor suitable for high-speed VNA operations. When compared to the cost of any other corrective grinding methodology, or to the cost of any type of corrective topping installation, this technology is enormously economical.

Reasons for Grinding: If you…

  • own an existing facility that you would like to convert to VNA operations, but the floor is too bad to permit full-speed turret truck operations, or
  • specified a superflat floor in a new installation, but have received a less than satisfactory floor, or
  • built a superflat floor, but due to unforeseen circumstances, some of the aisles are out of tolerance,

you might want to consider our unique corrective grinding technology.

(At some things) Computers Are Better than Humans

For a given wheel pattern, the specification of a single Fmin Number translates into a complex of six different wheel track tolerances, all of which must be satisfied simultaneously at every location. Since the associated 3-D correlation problem is well beyond any human's ability to visualize, corrective grinding of the wheel tracks into all six of the Fmin tolerances using the profileograph has always been a frustrating, circular, trial-and-error process limited, to all intents, to the correction of just one tolerance at a time. Unfortunately, since the correction of any one tolerance may adversely affect all of the other five, the grinding mechanic often ends up just "chasing his tail". Even seemingly small defects can result in long lengths of ground wheel track - and considerable re-grinding and re-testing costs.

Ten-Fold Savings

Recognizing this age-old problem, in early 2009 the D-Meter's software package was amended to produce an optimum set of grinding instructions based on simultaneous solution of the six-tolerance problem. Comparisons between the amounts of grinding required by this new optimization program and those required by the old trial-and-error method typically show about a ten-fold savings. Obviously this improvement - unique to the D-Meter - can translate on large projects into many tens of thousands of dollars in corrective grinding.

What is the Optimum Grinding Report?

The optimum grinding report is a table showing the depth of surface to be removed (in hundreds of a millimeter) at each 30 centimeters down each wheel track. For example, a "117" at the 21.3 m station on the center wheel track listing would indicate that 1.17 millimeters had to be removed at that spot. Using these simple tabulated instructions, the corrective grinding proceeds spot-by-spot down the aisle addressing all the wheel tracks at each station as indicated. Each spot is first ground to the required depth making no effort to blend it into the adjacent concrete. Once all the spots have been brought individually to their required elevations, a second grinding pass is made to fair the entire wheel track in. The depth ground is easily measured using the D-Meter operating in Utilities Mode. With this instant feedback, the grinding crew can learn the approximate time required to remove any depth of concrete in less than an hour.

Our services related to Corrective Grinding:
  • Testing the floor for Fmin with D-Meter
  • Analyzing the collected data and creating the Defect and Grinding Reports
  • Instructing the grinding crews on-site
  • Retesting the floor for Fmin after grinding
  • Issuing a final report certifying Fmin compliance
Please subscribe to our Newsletter to get a monthly e-mail with our latest