. Teacher's handbook of Slöjd . guide the stationary plane-ironin this way. Hence in cross-grained wood, or in timberwhere the fibres lie parallel with the surface, the plane has atendency to spKt or tear them, and the resistance ofiered bythe torn fibres is often so great that the plane cannot bedriven forward. The fibres also, by their elasticity, tend todrag the iron downwards. To prevent the fibres tearing infront of the iron, provision must be made (1) for breakingthem off at once, and (2) for bringing at the same time pres-sure to hear on them from above, just over the edge of theiron, b
. Teacher's handbook of Slöjd . guide the stationary plane-ironin this way. Hence in cross-grained wood, or in timberwhere the fibres lie parallel with the surface, the plane has atendency to spKt or tear them, and the resistance ofiered bythe torn fibres is often so great that the plane cannot bedriven forward. The fibres also, by their elasticity, tend todrag the iron downwards. To prevent the fibres tearing infront of the iron, provision must be made (1) for breakingthem off at once, and (2) for bringing at the same time pres-sure to hear on them from above, just over the edge of theiron, by means of which their elasticity may be diminishedor wholly neutralised. The j^7s^ object is attained by placinga cover above the iron, the efiect of which is to break off the The as quickly as they are detached; the second, by re-ducing the set or opening in front of the iron as much as iscompatible with the free passage of the shavings through it. 96 HANDBOOK OF SLOJD. To put onthe cover. The wedgeand jdig. d4:. Trying Plane. stock, B handle, C socket, D D cheeks, E wedge, F cover, Q iron, H boss. A rectangular opening in the iron, enlarged and roundedat one end, admits the screw of the cover, and permits of itsadjustment. The lower end of thecover is curved, with the concave sideinwards, and it terminates in a sharpedge. When the screw is tightenedthis sharp edge must lie close againstthe surface of the iron (see Fig. 55).If the slightest space is left the shav-ings will force their way other side of the cover must becarefully rounded to permit the shav-ings to glide freely over it. The edgeof the cover should be very near theedge of the iron. In finishing up asurface, and plain jointing, the dis-tance should be about -/^ i^^ch, and about double that distancein cases where coarser shavings may be removed. The dis-tance between the socket and the edge of the plane in frontshould be about xV inch for fine planing, and not more than^Q
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