Metalwork and Machining Hints and Tips for Home Machinists by Bradley Ian;

Author:Bradley, Ian;
Language: eng
Format: epub
Publisher: Fox Chapel Publishing

Fig. 20

Fig. 21

Fig. 22

The device consists of but three major parts, the base A provided with four feet A1 and a pillar A2 to support the rule clamp B and an anchorage C for the fine adjustment components. The base A is made from a piece of mild steel ⅜ in. thick and 2 in. by 2 inch. The four feet, the dimensions of which are given in the drawing Fig. 22, are made from hexagon material and are secured to the base itself by being screwed into threaded holes. The pillar, threaded at its lower extremity, is secured by a nut and washer on the underside of the base.

The rule holder itself is designed to be adjustable not only for the height at which the rule itself is to be set, but also for the width of any rules that may be needed. The rule holder body (B) is therefore provided with a moving jaw (B1) actuated by the adjusting screw (B2) both seen in Fig. 23. The dimensions of the holder and its component parts allow rules from ½ in. wide to 1 in. wide to be grasped firmly. The elevating screw (B3), also seen in Fig. 23, is set in the underside of the rule holder body and is operated by the adjustment nut (C1) placed in a recess on the top surface of the anchorage (C). For some reason or other the elevating screw was given a left hand thread. The advantages of this are not easily understood since it seems the device can function equally well with a right hand thread. The anchorage is fixed to the pillar (A2) by the clamp bolt (C2) tension being imparted by the barrel nut (C3).

With regard to the centering of the adjusting screw (B2) I have had difficulty in determining this without undertaking some further dismantling that might prove unpropitious. However, anyone contemplating the making of this device will no doubt make use of the rule clamp body as a jig, after marking-off, drilling and reaming 3/16 in. dia. for the 2 BA screw itself. I had not intended to provide a blow-by-blow instruction on making the rule holder for the good reason that I myself did not make it, and anyone who may contemplate its construction will scarcely need lessons in the simple work involved. As will be seen, the adjusting screw (B2) is provided with a small collar to hold the screw in place. This is cross-pinned to the screw itself, an ordinary sewing pin will serve well here.

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