The drawing
The drawing of the place of holes to be drilled is made with a ruler and a pencil, with a point. The centring of the hole can be realized with the point of a nail.
When we wish to draw the place of several holes in alignment, not to postpone the measures step by step, but still from the edge of departure called reference plan. We so avoid the errors of quotation which cannot always counterbalance.
Use mixt-shank drill bits on the brace and cylindrical-shank drills bits on the drilling machine.
With brace or drilling machine, it is important to work on a perfectly vertical plan. For that purpose, use a set square. It serves as guide.
For a perfect drilling
If you use a brace, make it turns around the axis of centring, by verifying that it is very perpendicular in the piece to be drilled. Drill the hole till the middle-thickness, then kick away the drill bit.
When it is possible,return the piece to drill and begin again the drilling on the other face; we so avoid the explosions of the wood in the hole.
When it is not possible to drill the second half of the hole on the back, drill at first a front hole with the drilling machine of a diameter equal to half dimension of the definitive hole. For the final drilling, accelerate the speed to reduce the risks of projections and without resting on it. Other solution, place on the other side of the hole a big piece of wood or cardboard.
Drilling with the aim of cut
When we wish to make a large-dimension cut in a plywood panel or of chipboard, we always begin to make a hole of access, by which can penetrate the keyhole saw or the jigsaw. Open a side hole with a drill bit of big diameter. Then, it is enough to introduce the saw.
A drill bit or an auger bit for each tool
With a brace, we have to use only hexagonal-shank drill bits. In the drilling machine we use drill bits with outside tracer lips , the diameter of which is compatible with that of the chuck. The maxi normal capacity of a drilling machine is 13 mm (diameter of the shank of the drill bit). Finally we only use specific drill bits or hex-shank driver bits on screwing machine and no normal auger bit.
