The Precision Grinding of commercial Tools

The entire metalworking business depends upon precision grinding in order to construct the essential tooling for mass production. Without this highly precise grinding process, manufacturing as you may know it, will come to a screeching halt.

As a young man just getting into the tool and die trade, I was astonished in the various types of grinders in use. After school I held a number of various jobs that all involved precision grinding. One of the more interesting machines was an ancient grinder, similar to a Blanchard grinder, that produced some kind of huge parts to dredge the Mississippi River, where I lived at the time. What was incredible is that this grinder was so old, but nonetheless was extremely accurate.

An additional machine that bewildered the life out of me, was the centerless grinder. I ran one for about a week and never did quite figure out why my round bushing did not just get destroyed by the two rotating abrasive wheels. If you have ever noticed one, you know what I mean.

We also had an enormous CNC surface grinder with a large wheel that scared everybody. The operator would line up a dozen or so parts, and fire up the wheel. The apparent believed was about the magnetic chuck holding all those parts: what if they came loose? There were many big dents on the guard that attested to the reality that this had happened prior to.

This wheel was a typical aluminum oxide grinding wheel, and also the coolant sprayed everywhere. Apparently, nobody seemed concerned concerning the lack of an industrial dust collector.

The very first time I ran a tool and cutter grinder was in a mold generating shop. I was not only making a cutter, but using the machine to cut ribs in a core block. Sadly, nobody informed me that I required to feed the cutter at each ends of the cut, and my rib was shaped much more like a j than an l. So, I had to grind an additional carbide cutter on the diamond grinding wheel and begin more than again.

Probably not a day goes by when a mold maker isn't needed to use a surface grinder. This machine is capable of doing a wide range of operations, all of which are highly accurate. Using the correct grinding accessories, nearly any contour or shape can be ground. A few of the essential accessories include sine plates, magnetic chucks, wheel dressers, diamond dressers, coolants, height gauges, gauge blocks, dial indicators, pin gauges, magnetic squaring blocks, vee-blocks, and spin fixtures.

Many businesses manufacture these tools, some of the better ones consist of Hermann Schmidt, Harig, Tesa, Starrett, Brown and Sharpe, and Mitutoyo.

Over the years I've used many various makes of grinders. Deckel, Elb, Parker Majestic, Brown and Sharpe, Mitsui, and Okamoto are just a few of them. Some of these companies have struggled to stay innovative and competitive and have either merged or gone out of business altogether.