Motor bicycle building : with numerous engravings and diagrams by Hasluck Paul N. (Paul Nooncree) 1854-1931

Author:Hasluck, Paul N. (Paul Nooncree), 1854-1931
Language: eng
Format: epub, pdf
Tags: Motorcycles
Publisher: Philadelphia : David McKay
Published: 1906-03-25T05:00:00+00:00

tool, and with its axis perfectly level with the lathe centres. The shaft is fed up to the cutter by means of the slide-rest, a start being made at the inner or rounded end of the keyway; the top slide is then worked for the required length of the key-way. Not more than -£ f in. in depth should be taken at one cut, or the tool may break. Provided the shaft is set true in all directions in the tool post, and the cutter is sharp, a perfect key-way is the result, equal in every respect to one cut in a keyway or slotting machine. The various keys may be fitted by filing flats on the shafts for the keys, but this method, unless the fitting is very well done, is not recommended. The simple method described above will be found much more reliable, and, of course, is quicker once the tool has been made. Besides which, the tool will cut other keyways of the same width.

All the keyways in the two main shafts, crank pin, and half-time shaft are of the same width and depth, that is, i in. by J in. The length of the keyway in the half-time shaft is 1 in. ; the others are cut as long as possible. The keyways in the flywheels, gear wheel, and exhaust cam should be filed, if a slotting machine is not available ; they must be quite flat and straight, with no taper. In fitting the keys, which should be made from cast steel, file on the sides first, to fit the width of the keyways ; then true up one face perfectly flat, and fit the key carefully in its place by filing on the other face only. Do not cut off the key until it has been perfectly fitted, and this is not attained until the key beds on its seating from end to end on both sides. The fitting of all keys on a motor of this kind calls for special care, as a wheel fitted to a shaft with anything but first-class workmanship is sure to work loose sooner or later.

Engine Belt Pulley.-—Fig. 75 is a section of the •engine belt pulley, which is an iron casting. The pattern should be made in two parts, parting at

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