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I've never seen the Irwin versions before.
Yep, they don't work as bone crushers which makes sense given their leverage (grip to jaw) is about 1:1 whereas the "QuickGrip" style have a much higher ratio built in. For me it was all about the access which is just like traditional spring clamps, but lock-able and the greater relief area behind the pads pays off for a lot of applications.
I have a gazillion* traditional spring clamps I use a lot, but often their lack of relief behind the pads makes them unsuitable. Certainly categorized as "special use" vs. max force clamping, but handy at the TS for clamping stuff to the miter gauge fence.
(* ~30)
Yep, they don't work as bone crushers which makes sense given their leverage (grip to jaw) is about 1:1 whereas the "QuickGrip" style have a much higher ratio built in. For me it was all about the access which is just like traditional spring clamps, but lock-able and the greater relief area behind the pads pays off for a lot of applications.
I have a gazillion* traditional spring clamps I use a lot, but often their lack of relief behind the pads makes them unsuitable. Certainly categorized as "special use" vs. max force clamping, but handy at the TS for clamping stuff to the miter gauge fence.
(* ~30)
