How to make long sergeants for wood

How to make simplest wooden bar clamps that work

Another entry related to the carpentry sergeants, and it surely won't be the last. This time I am going to make some very simple and easy to do bar sergeants. It is a model of long wooden sergeants that surely were used quite a long time ago, since to do them you only need, in addition to the wood and the bolts, a hand saw and a drill with your drill bit.

To do these woodworking sergeants I use four slats 3 × 4 centimeters in section and 68 centimeters long. The first thing I'm going to do is draw a line all the way down the middle of the top face of the four slats.

Mark the gap to drill the holes in the sergeants

And now I have to mark on the line of one of the slats the position of the holes that I need to make, 2,5cm from the ends and with a separation of 7cm between them. And with the square I am going to transfer the marks to the other three slats.


Drilling the holes in the drill press

With the column drill I want to drill 10 millimeter diameter holes in all the marks of the four slats.

Number the slats of each sergeant

I pair them two by two and draw Roman numerals at one end to find out which is the pair of each ribbon, and thus avoid mistakes.

Drill again to align sergeant holes

The numbering of the slats is because it is very difficult for the holes of one slat to be perfectly aligned with those of the other slats, so I put each slat with its partner, with a bolt at one end, and review all the holes with the 10mm drill bit to align the holes.

Those bolts are 10 millimeters in diameter and 14 centimeters long, with a 7-centimeter threadless area.

Drill to widen the end holes

I remove the bolt from the end of the slats and widen those holes a bit.

Cut four wedges with the hand saw

I also need to cut four 4,5 × 16 centimeter right triangles. I am going to cut these out of 1cm thick wood and, when I put them between the bolts and the boards to be glued, they will serve as wedges to press against the bolts.

Apply glue and put on the sergeants

I can now put the bottom cleat of the two bar clamps on the table, parallel to each other and with a bolt on the end of each. The other bolt I put in another hole of both sergeants, selected depending on the width of the board that I want to make. I start to glue the boards and place them in order against the bolts that I put at the end of both sergeants, ...

Put the other sergeant's list and tighten moths

and after gluing all the boards I can now put the upper slat of both long bar sergeants. And I have to tighten the wing nuts a bit.

Hitting and tightening the wooden wedges

Now I fit two of the wooden triangles (the wedges) between the glued boards and the bolt I put towards the center of the sergeants. I tighten the wedges a bit with my hands and I can hit them with a hammer to tighten them more. And if I want to tighten the wedges harder, I can tighten them with one of my cheap carpenter sergeants, as seen in the photos and on the video.

You can also see how to make others wooden sergeants somewhat more complicated.

And my posts about woodworking sergeants and jaws.


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