. Machine design. mal to the direc-tion of pressure. There is a tendency to displacementsideways, which necessitates a second guiding surfaceinclined to the first. This oblique pressure constitutesthe principal disadvantage of angular slides. Theirprincipal advantage is the fact that they are eitherself-adjusting for wear, as in the ways of lathes andplaners, or require at most but one adjustment. Fig. 26 shows one of theVs of an ordinary planingmachine. The platen is heldin place by gravity. Theangle between the two sur-faces is usually 90 deg. butmay be more in heavy ma-chines. The grooves g
. Machine design. mal to the direc-tion of pressure. There is a tendency to displacementsideways, which necessitates a second guiding surfaceinclined to the first. This oblique pressure constitutesthe principal disadvantage of angular slides. Theirprincipal advantage is the fact that they are eitherself-adjusting for wear, as in the ways of lathes andplaners, or require at most but one adjustment. Fig. 26 shows one of theVs of an ordinary planingmachine. The platen is heldin place by gravity. Theangle between the two sur-faces is usually 90 deg. butmay be more in heavy ma-chines. The grooves g, g areintended to hold the oil inplace; oiling is sometimeseffected by small rolls recessed into the lower pieceand held against the platen by springs. The principal advantageof this form of way is itsability to hold oil and thegreat disadvantage its fa-culty for catching chips anddirt. Fig 27 shows an invertedV such as is common on theways of engine lathes. Theangle is about the same as in the preceding form but. Fig. 26.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
