Popular Science Monthly 



Affixing a New Bearing Surface 

 to an Engine Crankshaft 



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Front bearing on cranK 

 shaft turned as shown 

 by clotted line 



Worn part filled in I 



to make bearing \_r-^ 



'HEN a bearing becomes slightly 

 worn it not only wears faster, but 

 it may do a great deal of damage to the 

 other wearing parts of the machine in 

 which it is located. There is no part of an 

 automobile that can cause damage quicker 

 than the crank- 

 shaft of the en- 

 gine, and one 

 loose bearing will 

 soon cause wear 

 on all the working 

 parts. If the en- 

 gine produces a 

 "knock," remove 

 the radiator and 

 run the engine a 

 few minutes. 



This will usually give evidence of the 

 worn part. Most engines have the front 

 bearing solid, at least it was so in the 

 engine to which this description relates. 

 In this case the crankshaft was consider- 

 ably worn and it was necessary to cut it 

 down somewhat to obtain a new straight 

 bearing. This was done as shown in the 

 illustration. The space was filled in with 

 a two-piece bearing, scraped to fit the 

 shaft. It was drilled for oil holes and 

 grooves were cut in it like the other bear- 

 ihgs. To assemble it, set the crankshaft 

 in the case and apply the two parts, then 

 force it into the front bearing. Drill 

 holes through th6 bearing and parts, and 

 tap for setscrews to hold them in place. 

 This will make such a bearing as good as 

 new. — P. P. Avery. 



Small Wood-Working Clamps Made 

 of Skate Parts 



THERE are lots of little jobs in the 

 shop where clamps are needed — 

 gluing up small pieces of wood, for in- 

 stance — and the ordinary clamps are too 

 large. For such work, the clamps from 

 old roller or ice skates can be used. Take 

 the two clamps and the screw and use the 

 skate key to tighten them on the work. 

 Put a small piece of wood under each to 

 prevent the work being bruised or dented. 

 This is a cheap and accessible expedient 

 as old skates are to be found in most 

 households. — Kingsley Greene. 



Oil 



Shaping a Bottle Cork to Make a 

 Medicine Dropper 



AVF]RY convenient form 

 of medicine dropper may 

 be made by any one upon a 

 moment's notice by simply 

 cutting two small notches in 

 the sides of a cork, as .shown 

 in the illustration. When in- 

 serted in the neck of a bottle 

 the liquid may be poured out 

 in a regular intermittent flow 

 of drops as slowly or as rapidly as de- 

 sired. The neck of the bottle should be 

 held just a little above the horizontal to 

 prevent a too rapid flow, particularly in 

 the case of poisons. — Floyd L. Darrow, 



How to Repair a Worn Wash 

 Bowl Plug 



A BRASS bowl plug had been in con- 

 stant use for a long time and the 

 wear rounded the edges on the underside 

 as shown at A, the edge being a mere 

 shell from the wear. The worn part was 

 filed down as shown at B, next a screw 



Making a new contact surface of leather 

 on the face of a worn wash bowl plug 



terminal, C, taken from the end of a 

 battery-carbon was soldered on as shown 

 at D. With this attachment, two leather 

 disks were secured to the surface with a 

 nut. Then the edges of the leather were 

 trimmed down to the original form of the 

 plug as shown at E. — James M. Kane. 



