Hidden loop. Drawing, description

BUILDER, HOUSEHOLDER
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Hidden loop. Tips for the home master

Builder, home master

I suggest that do-it-yourselfers who are engaged in the manufacture or have already made furniture with doors mounted on piano hinges, replace them with internal furniture ones, since the presence of piano hinges, even on high-quality furniture, clearly indicates its home-made origin and worsens the appearance.

However, a home craftsman who wishes to use a furniture hinge invisible from the outside of the door faces the problem of making a round recess on the inside of the door for each fly with a diameter of 36 mm with a flat bottom and a depth of 11 mm with a chipboard thickness of 15 mm. into which the door part of the furniture hinge should enter with an interference fit.

At a furniture factory, such recesses are drilled on a special machine with a tool resembling a finger cutter. I drilled with an ordinary electric drill with a simple drill of my own manufacture, which I offer to home-made people.

Hidden loop

It consists of two parts - a round mandrel and a flat drill itself. The mandrel is turned on a lathe from a steel bar of a suitable diameter. Its shape is simple, neither high precision nor a high class of surface finish is required here. However, it must be made from one installation so that there is no beating later. After removal from the machine, it is necessary to draw 2 axes at an angle of 90 degrees on the bottom of the mandrel through its center. Parallel to the first of them, at a distance of 25 mm from the bottom, drill a through hole with a diameter of 6 mm and saw the mandrel from the bottom to the hole to make a groove 2,5 mm wide. a package of hacksaw blades of the required thickness).

A through hole with a diameter of 17 mm is drilled parallel to the other axis at a distance of 4,5 mm from the bottom. An M6 thread is cut to the groove in this hole, and on the other side of the mandrel, this hole is drilled to the groove to a diameter of 6,5 mm: an M6x30 bolt is inserted into it and wrapped.

The drill is a piece of a file from a "rail cutter", sharpened on an emery wheel like an ordinary feather drill, only with slight differences in the heights of the cutting edges - only 1 mm (so that the bottom of the recess is flat).

The drill is inserted into the groove of the mandrel so that the distance from the bottom of the mandrel to the point of the center of the drill is about 12 mm, and is firmly clamped in the mandrel with a bolt. The center of the drill, of course, should be on the axis of rotation of the mandrel.

The tool is ready to go. Drilling recesses for the loop should be done with an electric drill, having previously passed a hole with a diameter of 1-2 mm to a depth of 10 mm in the center of the future recess. The electric drill must be of sufficient power: I did not succeed in drilling a recess, like a small hand drill. It is advisable to drill from one time to the depth until the bottom of the mandrel drops to the surface of the chipboard. In any case, before drilling recesses in the doors, it is advisable to try the operation on an unnecessary piece of chipboard.

Flat feather drills of another diameter necessary for the do-it-yourselfer can also be clamped into the mandrel.

Author: S.Smolyakov

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