Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . -rig -^3 AND FOUNDRY PRACTICE 81 their adjustment to one another to require onlya light blow to drive them home. (See Fig. 44.)Lastly finish up the spokes as desired and coatwith black shellac varnish. The making of cog or gear wheels is one ofthe most important features of the pattern. makers trade, and although a drawing or blu
Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . -rig -^3 AND FOUNDRY PRACTICE 81 their adjustment to one another to require onlya light blow to drive them home. (See Fig. 44.)Lastly finish up the spokes as desired and coatwith black shellac varnish. The making of cog or gear wheels is one ofthe most important features of the pattern. makers trade, and although a drawing or blueprint is usually provided in repair shops, the oldcog wheel itself is sometimes given as a brief review of the principles of gear work andthe technical terms employed by mechanics inrelation to it will serve the purpose of this vol-ume, inasmuch as every pattern maker should 82 PATTERN MAKING A 1^ possess a reasonable knowledge of the principlesand practical operation of the machinery in com-mon use for which he may be at any time calledupon to produce patterns. Gears are either straight or beveled. Straightgears are square on the face and transmit powerfrom one shaft to another one running parallelto it. Beveled gears havetheir faces at an angle withthe line of the axis on whichthey revolve, and transmitpower from one shaft to an-other running at an angle,usually at a right angle, toitself. The pitch line of agear wheel is an imaginaryline running around the wheelthrough the cogs at a pointwhich is governed by the number and sizeof
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicagofjdrakeco
