Practical Pattern Making

Practical Pattern Making

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ... to help this uneven spacing is to give lots of clearance. This may be done in the pattern, or perhaps some kind-hearted machinist or millwright who sets up the job will spread the wheels so far apart that the only danger will be that they may slip out of gear. Another way is to cut the teeth similar to the teeth of a cross-cut saw. It would be almost impossible to break a tooth of this form; but the bearings of the shaft would require a good deal of attention and grease, I think. After you have worked off the teeth without spoiling a single tooth, and each and every one is cut right to the centre of the line, you will be pretty apt to think that you have got a good job. So you have; but let us try them with a pair of calipers, or, better still, with a gauge. Cut a piece of hard wood, " thick, like Fig. 66. After making the distance from a to b equal to the depth of tooth below pitch line, saw from one side two thin pieces. These may be used as calipers by putting on a small handscrew. You can take two teeth and one space, or by turning the pieces both the same way you can take one tooth and one space. Don't be discouraged if the gauge shows a variation / in the sizes of teeth and spaces, for this is the 'common failing and the greatest fault of cast gears. It may, and probably will, be only a slight variation. Let the end b of the gauge go to the bottom of the space. Then if you find the teeth and spaces are all equal, you have got a good job. Be careful not to spoil it by sandpaper and varnish. Use a stick planed to fit the tooth for sandpapering, and put on the varnish very thin. This wheel will make the moulder happy, and produce a good casting if one good moulder does all the ramming. If two or three moulders each ram up a part...
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Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • United States
  • English
  • black & white illustrations
  • 1236872797
  • 9781236872791