Apparently ending decades of efforts to require SawStop-style flesh-sensing safety devices on table saws, the U.S. Consumer Product Safety Commission quietly dropped a proposed rule that had previously been expected to soon go into effect.

In a press release on August 20, the CPSC announced it would withdraw “several existing and pending rulemakings that no longer align with agency priorities, and which fail to advance safety.” Leading the list of six proposed rules was the Safety Standard Addressing Blade-Contact Injuries on Table Saws (76 Fed. Reg. 62678).

Specifically, the proposed measure would have required “a rule under the Consumer Product Safety Act (CPSA) that would establish a performance standard that requires table saws to limit the depth of cut to no more than 3.5 millimeters when a test probe, acting as surrogate for a human finger or other body part, approaches the spinning blade at a rate of 1 meter per second (m/s).”

CPSC said the decision was a “fundamental shift under CPSC’s new leadership” under the Trump administration. "Regulations that promote unscientific agendas, impose unnecessary costs, and reduce competition are no longer agency priorities,” said CPSC Acting Chairman Peter A. Feldman. “We will not squander limited resources on rules that diminish consumer choice or hand unfair market advantages to foreign competitors at the expense of American consumers and manufacturers.”

Ever since Dr. Stephen Gass invented the SawStop system in 1999, there have been repeated efforts to expand the technology to all table saws. 

The SawStop system detects contact between a table saw blade and flesh, causing the almost instantaneous activation of a brake that slams a block of aluminum into the blade to stop its motion while simultaneously dropping the blade below the surface of the table. SawStop famously demonstrated the system by using a hot dog in place of a finger. In countless tests, including by this writer, the system was shown to hardly even nick the hot dog. 

However, the system was frequently criticized because it tended to destroy the blade when activated, and it took about 15 minutes to replace the brake cartridge and blade to return the saw to operational status. There were also reports of the safety system being triggered when there was no danger to the operator.

Initially, Gass, who was a patent attorney, physicist, and amateur woodworker, tried to get existing table saw manufacturers to adopt his technology and license his patent. Those efforts failed as most companies thought the technology was too expensive and they feared potential liability if it failed. Gass responded by founding the SawStop company to manufacture and market saws himself.

That effort was widely successful, with SawStop eventually leading the market in its class and making inroads in school shops, professional woodworking operations, and with amateurs who could afford the technology.

Still, Gass was not satisfied. He made a number of attempts to get government to require the technology, not only with the federal CPSC, but also in an effort in California where he contributed more than $40,000 to the campaigns of state legislators to introduce legislation mandating the technology on all table saws sold in California. That legislation did not pass.

All the while, SawStop waged repeated defenses of its patents to keep other companies from manufacturing similar systems without licensing the technology from SawStop. In one high-profile case, SawStop successfully got the U.S. International Trade Commission to block the importation of Bosch’s Reaxx saw, which used automotive airbag technology to drop the saw blade in case of contact with flesh.

Manufacturers, particularly members of the Power Tool Institute, a trade group, argued requiring the technology on all saws would price low-end saws out of the reach of most consumers.

Still, for many, SawStop’s campaign to promote its system was more of a safety crusade than a business marketing effort. SawStop has claimed more than 10,000 finger saves since the product’s introduction, and the SawStop website continues to report testimonials from users who say the system saved them from serious injury.

Gass has now retired from the company, which was sold to TTS Tooltechnic Systems Holding AG, the same German firm that owns Festool. SawStop operations remain based in Tualatin, Oregon.

Meanwhile, other companies have managed to introduce different technologies that get around SawStop’s patents but still offer active safety measures to prevent injuries, often using AI technology and photo-proximity recognition. Prominent examples are award-winning sliding-table saws from Altendorf and Felder.

Some of SawStop’s patents have expired, and in a final effort to advance the CPSC rule, the company agreed in February 2024 to share one remaining key patent if the rule were adopted.

Full disclosure: This writer has owned a SawStop table saw for many years.