Popular science monthly . nder will become scored due todefective cooling or lubrication, or onaccount of dirt in the oil. This resultsin loss of power, because the compressionin the cylinder is reduced by escapinggas. If the scratches are not too deep,they may be lapped out and the expenseof re-boring the cylinder saved. A verysimple yet effective lapping-tool isshown. A main spindle of mild steelcarries a tapered expander-plug, whichfits a corresponding taper in a cast-copper lap. This has four grooves cutin it, two extending from the topnearly to the bottom, two from thebottom nearly to the
Popular science monthly . nder will become scored due todefective cooling or lubrication, or onaccount of dirt in the oil. This resultsin loss of power, because the compressionin the cylinder is reduced by escapinggas. If the scratches are not too deep,they may be lapped out and the expenseof re-boring the cylinder saved. A verysimple yet effective lapping-tool isshown. A main spindle of mild steelcarries a tapered expander-plug, whichfits a corresponding taper in a cast-copper lap. This has four grooves cutin it, two extending from the topnearly to the bottom, two from thebottom nearly to the top. These permitthe lap to expand when it is forced downon the expander-plug by the driving-pin is inserted in the spindle,this turning the lap because it fits oneof the slots. The scored cylinder is clamped secure-ly on the bed of a drill-press and the lapinserted in the bore after it has beencovered thoroughly with abrasive ma-terial, usually fine emery and oil. Thediameter of the lap is slightly less than. uz::j A lapping tool for engine cylinders avoidsthe necessity of reboring Popular ScicJice Mnnt/ih/ 125 that of ^hc ryliiider before it is expaiKicdby the rlanipiiisi-mit. It is tiinicd tolia\e .1 Ner\- sniootii siirfaec. In use,tlie drill-press is set in the back gears sothe spinclle will rotate slowly, while thelap is revolving. It is also raised up anddown by the hand-feed lever. The lapmay be expanded slightly after it hasbeen turned and reciprocated for a timeand fresh abrasive added. Care shouldbe taken to clean all emery and oil outof the cylinder when the lapping processis completed. If the work is properlydone, all the scratches will be eliminatedand a smooth bore secured. Deepscratches, such as caused by a loosewristpin, can only be eliminated byre-boring the VV. P-age. A Handy Hook for the Automobilist and cheap attachment foran automobile-jack is an iron hookthat can be made by an> should be just a little
Size: 1803px × 1386px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
