de Groot makers Dumbbells

These dumbbells have been designed using state-of-the-art parametric solid modelling software. The caps are made of 8” cold rolled round which is CNC machined and later calibrated by conventional lathing. The cap faces are engraved for permanence and painstakingly paint filled by hand. They are polished, left bare, and coated with a food-grade industrial corrosion inhibitor. The one piece handles are CNC machined from an alloy of steel, knurled with an aggressive pattern, heat-treated and subsequently black oxided for protection. All fasteners are certified grade 8 hardware. The average mass accuracy per dumbbell in the set shown is .04 pounds!! They are so accurate that the density of the material in a given bar from which the caps are machined must be determined before a set is made.

The handles in the set shown are 1.25” in diameter. These handles are guaranteed to never come loose. Will they bend during normal use? Not likely. In one test, we dropped an 80 pound dumbbell 2010 times at a 45 degree angle onto a ¾” thick rubber mat. The drop height was 3.5 feet. The dumbbell was marked to ensure that it could be dropped ensuring the same contact point on the mat each time. Every ten drops, the distance between the inside faces of the caps was measured with a dial calliper at three points, 120 degrees apart. There was no measurable distortion. So, we guarantee that, during normal use, our handles will not permanently bend.

A polished, bare metal finish protected by periodic application of the aforementioned compound is the only reasonable and practical method of preserving the finish of this product. There is nothing available, from an engineering standpoint, that will permanently protect such a product from corrosion during its life cycle in a high use environment, regardless of cost. Rubber coating will eventually shear, de-laminate and abrade with no course for refinishing….and such coated products cannot be made to such mass accuracies. Powder coating is not an option due to the thermal masses involved and concomitant cost. Chrome is expensive, yet beautiful and it will fail mechanically, long term with expensive refinishing prospects. Other electroplating, such as zinc are cheaper but ineffective long term with the same refinishing problems as chrome. Wet coat paint is pointless except for initial presentation. This product, as provided, is easily refinishable if the aesthetic value is of concern through its life cycle. Here, is a product which is…built to last!!!

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