Measuring Tools

by Unknown

Fig. 13. Convenient Attachment for Machinist's Scale

Fig. 13 shows a very convenient appliance. It will be found very useful in the machine shop for setting inside calipers to any desired size. The gage is clamped over the rule wherever desired, and one leg of the calipers set against the gage, the other leg being brought flush with the end of the scale.[^[6]]

Setting Dividers Accurately

To set dividers accurately, take a 1-inch micrometer and cut a line entirely around the thimble as at A, Fig. 14, and then, with the instrument set at zero, make a punch mark B exactly one inch from the line on the thimble. If less than one inch is wanted, open out the micrometer and set the dividers to the dot and line so as to give one inch more than the distance wanted. Now with the dividers make two marks across a line, as at a and b, Fig. 14, and then set the dividers to one inch and mark another line as at c. The distance from c to b is the amount desired, and the dividers can be set to it. Great care must, of course, be exercised, if accurate results are required.

Fig. 14. Method of Setting Dividers Accurately

Combination Caliper and Divider

The combination caliper and divider shown in Fig. 15 is one that is not manufactured by any of the various tool companies. It is, however, one of the handiest tools that can be in a machinist's kit, as it lends itself to so many varied uses, and often is capable of being used where only a special tool can be employed. The illustration suggests its usefulness. The tool can be used as an outside caliper, as an inside caliper, and as a divider. The common form of this tool has generally only one toe on the caliper legs, but the double toes save the reversal of the points when changing from outside to inside work. The divider points may be set at an angle, which permits of stepping off readily around the outside of a shaft at angular distances, where the ordinary dividers are useless. A number of other uses could be mentioned, but any intelligent mechanic can readily suggest them for himself.

Fig. 15. Combination Caliper and Divider