THE JOINT WILL BE PERFECT

JOINT WILL BE PERFECTWhen carrying out carpentry work, especially in the manufacture of panel furniture, one of the most common operations and uncomfortable — butt connection of wall. It is necessary to strictly maintain the angle between them (and not necessarily the angle of a straight line) and provide enough pressure in the joint. Even more, this operation is more complicated if have to work alone, without assistants.

Presented in photo 1 a simple device in the form of triangular inserts and clamps practically solves the problem of providing durable and precise connection of walls.

Clamps (bar), you can borrow from hand-held circular saws or produce according to their type and likeness. For this is quite simple Handtools.

In the preparation of the triangular insert is required to withstand between the working edges to the desired angle equals the angle between the joined walls. In addition, you should pay attention to the surface of the working edges were perpendicular to the plane of the triangle. Otherwise, the offset of the connected walls.

A similar device can be used as conductor during welding at an angle of round billets (pipes or bars). For this to work you must select the edges of the groove. The easiest way to make a triangular groove with a circular saw. But you can draw and radial sampling corresponding to a rounded chisel.

The conductor for welding of circular workpieces

The conductor for welding of circular workpieces:

1 —bar clamp (2 PCs); 2 – workpiece; 3 – conductor.

 

A device for joining panels

Device for joining panels

 

Geometry mitre

Geometry mitre

 

A mitre box to handle Gorzow round blanks

A mitre box to handle Gorzow round bars

Photo 2 shows another simple device — a mitre box designed to prepare the ends to be welded at an angle of round parts. Usually this operation is done by eye, at least — on the markup or using a paper template taped to the workpiece in cutting position. With this technology the quality and accuracy of the prepared end, as a rule, leave much to be desired. The application presents the photo of the miter box ensures the quality and accuracy.

Mitre dimensions are derived from the maximum diameter D of the workpiece. The height of the miter box consists of base thickness t (20— 25 mm), height of workpiece (a+R) and the depth of entry of tool (saws) at the beginning of treatment With (5 — 10 mm). From Fig.2 a=R2. Then N = (20…25) + R(1 + 2) + (5…10) 1,2 D + 30 mm.

The width of a groove and two shoulders d (10— 15mm) will make the width of the workpiece to the miter box.

From Fig.2 = (N-t).2 = 2,4 D + (10…20). Therefore, 2,4 D + (30…40).

 

For example, if the use of the miter box to limit the processing of workpieces with a maximum diameter of 50 mm, the height of the mitre is 90 and the width is 150 — 160 mm.

For the manufacture of miter box you should use a hardwood or plastic.

It is desirable that the design was solid, but allowed and collected of three parts: two corner walls and the base. In this case, the wall can be obtained by sawing at a 45° angle to the workpiece of a smaller size, and for the reason to use the Board more soft rock.

V. LUCHENKO, S. 3арванцы, Ukraine

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