Lots of older (large/pro) tale saws needed DC brakes fitting to them to meet regs, even without a dado set. Inverters can do all that now.
AIUI since the HSE banned the use of dadoes, they did it by specifying the max length of arbor on new table saws on sale - not by banning the sale of dadoes.
You need to consider how the thing is loaded and what you are nothing. If you notch the top of a joist, and then fill it with a tight fitting cross member, you will not lose much strength.
Industrial woodworking machines have a maximum time for the blade to come to rest, and this applied retrospectively, hence many machines with DC braking retrofitted.
I think dadoes were also banned in industry (i.e. you had to discontinue using them), *and* a maximum length of arbor specified for all new machines sold.
I bought an old 3 phase Startrite bandsaw and fitted an inverter to run it off single phase. When I have a suitable location there'll be a Wadkin or similar mahoosive old-british table saw too.
I'm not sure maximum permitted stopping time improves safety that much on table saws.
As they say - it's stopped when you can count the teeth.
I think the problem was more spindle moulders (along with high background noise environments), where it isn't so difficult to put fingers into a more-or-less-invisible rotating cutter.
All traditional woodworking joints significantly weaken the wood due to the amount of timber that has to be cut away. Mortice/bridle/halving joints are the very worst for this. Dovetails are only slightly better. Gang/plate nails, hangers, timber connectors are a minimum of 50% stronger (in some cases 1000% stronger) and are faster to use. In most cases the joint is far stronger than the timber. Loads are better distributed in the timber hence the joints are much less likey to fail. There are other advantages too, eg joists need no longer penetrate the inner leaf making the house draught proof and protecting the timber from damp. In practice much less timber is needed hence the job is cheaper as well as quicker. They also lend themselves to machine shop assembly of factory made components (eg trusses) They just look like shit but where they are hidden, it matters not.
Anybody that doen't know this needs to get some education/training.
Yup I was aware of the time limitation, and also the short arbour problem. Just not sure if there was actually an industrial ban on dadoes as such. They don't strike me as particularly dangerous (compared to wobble blades say).
Yes I had a read of that and could find no mention of superiority of metal brackets to traditional joints. It appears to confirm that the main advantage of this jointing system is ease of use on and off site.
While their load bearing capacity may be adequate in one plain their ability to resist twist or stress in the non designed for planes would be less than the glued cross halving joint under discussion.
To me they always looked like a cheap alternative to doing the job right especially as the report raises concerns with incorrect site practices, (i.e.) using plaster board nails or not using enough nails
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