Table saw injuries can be quite gruesome — amputation of fingers, for example — so any new technology that might make woodworkers more safe is welcome. The first innovator in the field was the SawStop, a device that could stop the spinning blade of the saw whenever it detected human skin. Mighty impressive, but none of the major manufacturers wanted to buy the technology: it increased the cost of existing saws beyond what they thought their customers would be willing to pay. The inventor had to form a company to build his own table saws instead.
A post at the Popular Woodworking blog looks at a newer device to make table saws more safe:
Ten years ago, table saws were about to change. In 2001, you could buy a cabinet saw, such as a Delta Unisaw, a Powermatic 66 or a clone of the Unisaw made in Taiwan. Or you could get a contractor’s saw, a heavy but relatively portable table saw. Benchtop saws were not a significant part of the market, and things hadn’t changed much since the end of World War II. All the saws at the time had one thing in common: awful guards that were rarely used. Things were changing on two fronts. Underwriter’s Laboratories and the Consumer Products Safety Commission (CPSC) were looking into bringing American saw’s guard systems into the modern age, spurred in large part by a pesky woodworker from Berea, Ky., named Kelly Mehler.
Mehler was the author of “The Tablesaw Book,” and he questioned why European saws had more effective and user-friendly guards. At about the same time, Stephen Gass, an amateur woodworker and patent attorney with a doctorate in physics invented the SawStop, an imaginative and revolutionary device that could stop a spinning blade in less than a heartbeat if a flesh came in contact with it. These two ideas caught the attention of CPSC, and the long saga of what to do about the problem of table saw injuries began.
A couple weeks ago, this story was mentioned in the national media, in a brief story with scary-sounding headline in USA Today. As has happened many times in the last few years, this set off a round of emotional debate among woodworkers.
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In the next few months the discussions and meetings between manufacturers and the CPSC will probably resume. One thing that will likely factor into this round will be alternatives to SawStop’s “flesh-detecting” technology. Last spring, the joint venture of member companies of the Power Tool Institute filed patent application 12769396. This describes an electronic detection system and a mechanism to fire an explosive trigger (similar to that used in automotive airbags) that would drop the blade below the table. An important difference to this approach is that it wouldn’t force anything into the blade, thus avoiding an expensive replacement due to an incidental firing. Also interesting is the mention of this system’s ability to tell the difference between wet wood and human flesh.
And there are several new patent applications from the SawStop inventors covering detection and deployment systems for table saws, and the possibility of using similar devices in miter saws. Will this mean new, less-expensive and less-destructive systems for table saws and other tools that will make woodworking safer, or will it mean years of waiting while the lawyers battle over intellectual property issues?
