Depends on who's definition of bench plane you use, but by and large, yes. Except when it's no...paulc":2r0hssbo said:Is it correct to put a bench plane blade in bevel down
Yes (although there's probably an exception to the rule somewhere - but we'll soon find out... :roll: :winkpaulc":2r0hssbo said:and a block plane blade in bevel up ?
Ah, one of those deceptively simple questions full of traps for the unwary trying to explain it. Anyone better at theory want to take this one? :? Oh well, I'll take a stab at it. Despite the current move towards high angle blades in low angle planes, the historical reason for bevel up planes was to get as low an angle of attack as possible, which tends to give better results on - principally - end grain. If you imagine tilting a blade, bevel down, as low as a low angle block plane you'll see pretty quickly the bevel of the blade is going to be rubbing on the work and thus stopping the edge making the cut. Okay, you say, so just grind a shallower bevel to give more clearance angle then. Alas no; make the bevel too shallow an angle and it's too weak and will fold over, break and be generally no bloomin' use. Soooo, instead flip the blade over and then you've all the clearance you could possibly want. Hey, you say, so I can do any blade bevel angle I like then, right? Ah, no. Now, instead of the pitch of the frog defining the angle at which the edge meets the wood, now it's the angle of the bevel. Erm... try the "tech" link under the High Angle Blade on this page which has a better chance of making that clear than I have. Derek's good at explaining this sort of thing, so with luck he can unwind the confusion I've just made for you...paulc":2r0hssbo said:why the variation and what difference does it make to cutting action? thanks
I agree Alf. My take on this is that "small" block planes (such as the Stanley #60-1/2 and #65) were basically all that the cabinetmaker of old needed for paring end grain on boards.Despite the current move towards high angle blades in low angle planes, the historical reason for bevel up planes was to get as low an angle of attack as possible, which tends to give better results on - principally - end grain