I am wondering about the acceptable thickness of the plywood of the end frame (Paul recommends 1/2″). My only plough plane is a record 43, which widest blade is 1/4″. Is it possible to use 1/4″ plywood for the end frame or it would be too fragile?
Otherwise: – is it possible to make a wider groove with 2 passes of the plough plane? – would 1/4″ plywood be enough if I divide the panel in 2 with a vertical rail to increase the rigidity?
you’d have to use a record no44 or similar, you could actually do two grooves with a no43 as long as the end result fits, also you’ll find the ply is 12mm not 1/2″ so there might be a gap anyway if you used an imperial 1/2″ cutter, cutting two grooves instead could make a tighter/better fit. I have not made the project but it’s on the ‘to-do’ list.
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