Posted by
Easy WoodCraft on
Feb 15, 2016
A mortise gauge has two pins instead of one to simultaneously mark out two parallel lines. It's designed specifically to lay out the cheeks of mortises and tenons. One of the pins is fixed, while the other is independently adjustable. In some cases, this pin adjusts via a simple pull slide; on others there`s a thumbscrew or knurled knob mounted to the end of the beam. Many mortise gauges also feature a third pin on the beam opposite the two mortise pins. This allows the mortise gauge to also function as a marking gauge.
Setting the pins
The first step in using a mortise gauge is to set the pins. To do this, hold the mortise chisel up to the pins, adjust the traveling pin over to match the width of the chisel and lock it in place. Then slide the fence over so the pins are set the desired distance from the edge of the work-piece. Try the setup on a scrap piece first and check the layout with a rule. Readjust as necessary.
Basic use
Just as with the marking gauge or the cutting gauge, the critical thing here is to firmly press the stock up against the edge of the work-piece. All you're looking for here is steady even pressure. Popeye-like strength will only cause problems—most commonly, excess pressure will shift the position of the traveling pin or the beam. Use a light, firm grip, and tilt the gauge away from the direction of movement.
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