I am considering having a longer arbour made for my newly aquired Wadkin 10" sawbench, to enable use of a stacked dado cutter. Here in the UK, bench saws are not generally available with long enough arbours to accept these. I have noticed that on saws that have long enough arbours to accept dado cutters, the arbour has a long thread and a relatively short unthreaded shoulder, which means that part of the dado is sitting on the threaded part of the arbour. This strikes me as being inferior to having a wide unthreaded shoulder, to accomadate all of the dado, then use spacers to tighten up when using a normal sawblade or narrow dado setup. Any advice ,comments would be appreciated.
Thanks.