. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 39—View of the open cabinet from the end shaft fit against the ball-bearings, thus holding them inplace. The pulleys are of standard manufacture, there beinga grooved pulley 4 inches in diameter which is connected 64 Model Engineering to the l-inch motor pulley with a round leather belt, andtwo %-inch face pulleys 1% inches and 2 inches in diam-eter from which the lathe spindle is driven. The countershaft and motor are mounted on a woodhase whi
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 39—View of the open cabinet from the end shaft fit against the ball-bearings, thus holding them inplace. The pulleys are of standard manufacture, there beinga grooved pulley 4 inches in diameter which is connected 64 Model Engineering to the l-inch motor pulley with a round leather belt, andtwo %-inch face pulleys 1% inches and 2 inches in diam-eter from which the lathe spindle is driven. The countershaft and motor are mounted on a woodhase which is bolted to the base board of the bolt holes are slotted, thus making it possible to take. Fig. 40—Showing the driving motor up slack in the lathe belt by moving the countershaft andthe motor. The rheostat is just behind the lathe where it can bereached conveniently by the operator. Near it is a snapswitch which controls the entire current supply to themotor. Either this or the rheostat, or both, may be usedas the operator mshes. If the builder desires, he can arrange a small rack onthe back of the cabinet to hold various tools and attach-ments for the lathe. If such a rack is made, it wilLbenecessary to so design it that the tools will be held inplace while the cabinet is being taken from place toplace. CHAPTER III DRILLS AND DRILLING Marking work for drilling—How to sharpen drills for various metals—Speed of drill for different work—Description of twist drills andnames of parts—Using the V-Block. Drilling generally forms an essential operation inthe construction of anything the model engineer makes,and knowing how to drill accurately and properly is adistinct as
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