Roubo Is Coming… Part 24

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Setting the dimensions of the planing stop with the Pied du Roi ruler

Having spent a great deal of time and effort getting the bench top flat and looking good, the prospect of drilling a bunch of holes, and cutting a large mortise in it, feels very counter intuitive. The holdfast holes and planing stop are at the cornerstone of my workholding strategy for this bench, and consequently they are critical. But even recognising that, preparing to drill through the newly finished bench top is a little daunting.

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A birdcage awl leaves a clear location mark for each holdfast hole

The bench top will have ten holdfast holes – a row of six spaced 3.5 pouce from the rear edge and on 16 pouce centres, and a second row of four holes which are 10 pouce from the rear edge of the top and situated also on 16 pouce centres but offset by 8 pouce compared to the rear row. This is essentially as Chris explained on his Popular Woodworking blog a few years ago. The planing stop mortise measures 3 pouce square, and is located to the left of the front left leg, 3 pouce from the edge of the bench top.

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Laying out the second row of holdfast holes – one combination square sets the distance from the rear pf the slab, and the other sets the distance from the rear row of holes

While the oil was drying on the vise chop, I spent some time laying out the location of each holdfast hole and the planing stop mortise, using the Pied du Roi ruler Brendan made me. Setting all of my measurements from this ruler avoids having to do any mental conversion, and minimises the risk of any layout or measurement error. I started by laying out the back row of holdfast holes, marking the location of each hole with a birdcage awl. With the first row of holes marked out, I was able to then layout the second row by placing the holes equidistant between each hole on the first row, and and the correct distance from the back of the bench top.I found a pair of combination squares useful for this task, one set to the offset between the rear hole and the front row, and the other set to the distance from the back of the slab. The first combination square was then able to reference directly from the ruler of the second, giving an accurate and consistent way of positioning the holes each time.

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The planing stop mortise was also laid out with the Pied du Roi, this time my Hamilton Tool Works Traditional Marking Gauge stiking lines to define two sides of the mortise. The extra long beam Jeff suggested for this gauge definitely paid off when marking out the back line of the mortise. The remaining sides were marked with a Vesper 10″ square referencing off the side of the bench top.

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By this time the oil had dried on the vise chop, so I did the final fettling and fitting of the Benchcrafted vise hardware. Once fully installed, the hardware moved sweetly and very rapidly. Adding the vise chop also makes the bench look a lot more “completed”. I’ll pluck up some courage and then start boring out the holes in the bench top, which will complete the functionality of the bench. The end is very, very near.

 

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