plow plane, up one side & down the other

A small detail that often perplexes people is the grooves plowed in chest’s stiles for the bevelled panels. In this view of a joined chest from Dedham, Mass. the groove for the side panel runs out the top end of the stile . (it’s clogged with some kind of filler, after the fact) The groove for the front panel does not come out the top.

Now the other front stile:

Here the groove for the front panel runs out the top, (again patched). The other groove is stopped before it gets out the top. This is as it should be. Here’s another chest, from Essex County, Mass. – same scenario.

front stile PR 3 — proper right stile, top view

front stile prop left — proper left stile, top view

The plow plane’s “handedness” is the reason behind these grooves being found in this pattern. I started a joined chest last week, and got a couple of shots that aim at showing how this happens. The plane goes up one side of the stile, and down the other. To get the groove deep enough just above the lower mortise on any side; you need to extend the groove beyond that mortise. Here’s two front stiles, laying on their faces.

chest stiles w grooves for side panels — grooves for side panels in chest stiles

Here is a full view of the stiles. To get the groove deep enough (about 1/2″) just above the lower mortise on the left-hand stile, I had to bring the plow plane back & extend the groove below this mortise. Because the plow only cuts in one direction (like a molding plane) the other stile’s groove was cut from top to bottom. Thus here, I had to get the groove beyond the top of the top mortise, to hit my 1/2″ depth just below that mortise. Thus the grooves run up one side, down the other. Almost always.

up one side down the other — up one side, down the other

Here is the plane, (a poor shot, but the best I could get quickly) – the gist of it is to get the rear “skate” of the plow low enough to engage the iron in the mortise. If the groove did not extend back there, the skate would be tilted, and the iron wouldn’t be able to cut the groove deep enough right above the mortise.