. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . rough the opening which runs the length of the crosspiece. As the piston rod moves up and down, it causes thecrank pin to describe a circle, the cylinder engaging thepin sliding from one end of the cross piece to the other. The steam ports are covered mth a slide valve of theusual type and in all other respects the little enginerepresents standard model design. • The cylinder casting is best held in a three jaw uni-versal chuck for boring and facing
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . rough the opening which runs the length of the crosspiece. As the piston rod moves up and down, it causes thecrank pin to describe a circle, the cylinder engaging thepin sliding from one end of the cross piece to the other. The steam ports are covered mth a slide valve of theusual type and in all other respects the little enginerepresents standard model design. • The cylinder casting is best held in a three jaw uni-versal chuck for boring and facing one end. It is thenreversed in the chuck mth the faced-off end backing upagainst the chuck face to insure that the end to be faced 135 136 Model Engineering will be truly parallel with the finished one. The valveseat is next to be considered, and the best way to ma-chine this is to mount the bored and faced casting uponan angle plate, taking the necessary cut off the valveseat. If no angle plate is available, the facing may pos-sibly be done with a file providing the worker is suffi-ciently expert in the use of this tool. A plane surface. Fig. 93—The slide-crank engine is best produced by drawing the casting across the faceof a large, fine file, rather than by attempting to run thefile across the casting. The cylinder heads may next be machined by holdingthe casting in the chuck by means of a chucking pieceleft for the purpose. Before removing the casting fromthe chuck, it is well to scribe the circle around which theholes for the cylinder head screws are to be drilled. Bydoing this in the chuck with a pointed tool, the layout A Model Slide Crank Steam Engine 137 Avill be perfectly coincident with the bore of the is afterward a simple matter to lay off and prickpmich the locations for the six holes in each cylinderhead. The hole for the piston rod and packing glandis, of course, to be drilled in the lower cylinder headcasting before taking the latter from the c
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