smorgasbord
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So I did some more digging, mostly here:https://www.govinfo.gov/content/pkg/FR-2011-10-11/pdf/2011-26171.pdf
Turns out the Riving Knife requirement is in UL 987. That document costs hundreds of dollars. But, the document I linked above describes UL 987 as a "voluntary standard for table saws" after describing table saws in 3 categories: Bench Saws, Contractor Saws, and Cabinet Saws. Prices quoted ranged from $100 for the cheapest bench saws to $3,000 for cabinet saws.
and then why this is all happening:
I find the 30.9% of injuries occurring with blade guard in use statistic questionable. I'd guess people are just stating that when they go to the ER, especially since not using a guard might get you fired. The document does talk about OSHA enforcement making things like the UL standard a requirement, not voluntary - and points out that home/amateurs don't have OSHA requirements.
It's interesting that the current riving knife inclusion is not required by law, but is effectively required as no manufacturer wants to get sued for injuries, which they'd lose if they didn't follow the UL "standard." Similarly, it appears the saw manufacturers got together to create a blade guard design that they all use, again probably for legal reasons since there wouldn't be suits of one company's blade guard being safer than another.
It would be interesting to see the CPSC make flesh sensing a requirement without also making current voluntary things requirements.
Turns out the Riving Knife requirement is in UL 987. That document costs hundreds of dollars. But, the document I linked above describes UL 987 as a "voluntary standard for table saws" after describing table saws in 3 categories: Bench Saws, Contractor Saws, and Cabinet Saws. Prices quoted ranged from $100 for the cheapest bench saws to $3,000 for cabinet saws.
The original requirement for table saw guarding specified a complete guard that consisted of a hood, a spreader, and some type of antikickback device. The requirement further specified that the guard hood completely enclose the sides and top portion of the saw blade above the table and that the guard automatically adjust to the thickness of the workpiece. A blade guard that met this requirement was typically a hinged, rectangular piece of clear plastic.
The sixth edition of UL 987, published in January 2005, added design and performance requirements for a riving knife and performance requirements for anti-kickback devices. This revision essentially required new table saws to employ a permanent riving knife that was adjustable for all table saw operations. The requirement also allowed for riving knife/spreader combination units, where the riving knife could be used as the attachment point for a blade guard during through cuts. The effective date for the riving knife requirement is January 31, 2014, for currently listed products, and January 31, 2008, for new products submitted for listing to the UL standard.
The current edition, the seventh edition of UL 987, published in November 2007, expanded the table saw guarding requirements to include descriptions of a new modular blade guard design developed by a joint venture of the leading table saw manufacturers. The revised standard specified that the blade guard shall consist not of a hood, but of a topbarrier guarding element and two sidebarrier guarding elements. The new modular guard design was intended to be an improvement over traditional hood guard designs by providing better visibility, being easier to remove and install, and incorporating a permanent riving knife design. The revised standard also specified detailed design and performance requirements for the modular blade guard, riving knife, and anti-kickback device(s). The effective date for the new requirements was January 31, 2010
and then why this is all happening:
In addition, of the 66,900 table saw operator blade contact injuries in 2007 and 2008, approximately 20,700 (30.9%) of the injuries occurred on table saws where the blade guard was in use. The current voluntary standard for table saws does not appear to address those types of injuries.
I find the 30.9% of injuries occurring with blade guard in use statistic questionable. I'd guess people are just stating that when they go to the ER, especially since not using a guard might get you fired. The document does talk about OSHA enforcement making things like the UL standard a requirement, not voluntary - and points out that home/amateurs don't have OSHA requirements.
It's interesting that the current riving knife inclusion is not required by law, but is effectively required as no manufacturer wants to get sued for injuries, which they'd lose if they didn't follow the UL "standard." Similarly, it appears the saw manufacturers got together to create a blade guard design that they all use, again probably for legal reasons since there wouldn't be suits of one company's blade guard being safer than another.
It would be interesting to see the CPSC make flesh sensing a requirement without also making current voluntary things requirements.