![]() ![]() In the naked wood it can be extremely easy to see the difference between a planed surface and one finished by sanding, as you say it's obvious from across a room. Just to emphasise if needed: this is after finishing. Well planed > badly sanded certainly, but not over any possible quality of sanded surface. I've seen similar debates elsewhere and FWIW I've never seen good evidence presented on the planing > sanding end of the argument. With a larger diameter cutter block the scallops would be shallower.Ĭlick to expand.Not sure if you missed the threads or the individual comments, this same has been argued here a number of times in the last couple of years (not sure if it's the most recent time but it came up during one of the mammoth threads about hand planing about a year ago). With the same size cutter block these would translate into scallops from 5 to 45microns deep, with 30microns equating to 320grit, custard looks close to spot on. This seems small so perhaps the compressibilty of wood effects the outcome, or my maths is wrong.įrom what I recall scallops I have seen from my p/t seem to be more in the order of 1-3mm wide depending on feed speed. ![]() We can solve for the height based on pythagorus, height of ripple = 0.1 - sqroot(0.1^2-.0003^2) = 0.45microns - 1.8microns (30microns is 320 grit). In theory a point of wood as high as cutter rises 0.3mm - 0.6mm away from its lowest point could pass under the blade untouched by the cutter. 006s in this time the board can move forwards. The blade speed is huge in comparison to the board speed, say 40m/s (120ft/s) blade speed vs 0.05-0.1 m/s (10-20ft/min) so passes the board effectively instantaneously, however for a two cutter block rotating at 5000rpm a cutter only passes the board every 1 / 2 / (5000/60) =. Each pass of the blade takes a circular cut out of the woodwork with a radius equal to the cutter block + blade extension, assume 0.1m. This is fundamentally a geometry/trigonometry question. ![]()
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