Canadian wood products industries . the saw. Examine the back-edge of the saw with a backgauge (See Fig- 4). Mark the extent of the hollowon the back of the saw, if there be one, and roll orhammer from mark to mark. Begin at the centre ofthe saw and work to the back edge by rolling parallelwith the saw. Repeat, if necessary, until the backis stretched to fit the gauge. If the back should befull or lumpy, follow the same course, working fromthe centre of the blade towards the tooth-edge. Examine the saw with a straight-edge for lumpsand with a tension gauge for irregular tension. Make correctio
Canadian wood products industries . the saw. Examine the back-edge of the saw with a backgauge (See Fig- 4). Mark the extent of the hollowon the back of the saw, if there be one, and roll orhammer from mark to mark. Begin at the centre ofthe saw and work to the back edge by rolling parallelwith the saw. Repeat, if necessary, until the backis stretched to fit the gauge. If the back should befull or lumpy, follow the same course, working fromthe centre of the blade towards the tooth-edge. Examine the saw with a straight-edge for lumpsand with a tension gauge for irregular tension. Make corrections as the work progresses. When ready forthe wheels, the saw should lie flat on the levellingblock and fit the tension gauge on both sides whencurved and tested as in Fig. 2. Fig. 5 shows the test for tension on the up bendor outside curve with a short straight-edge. If thesaw is correctly tensioned an almost perfect curve willshow under the straight-edge between both edges ofthe saw- If it shows flat, trace its extent and stretch. Fig. 4—Testing the back of the saw it with a roll or hammer until it shows an evencurve. Accurate Fitting After the saw has been properly tensioned itshould be accurately fitted. The swaging and fittingof the teeth are practically the same as in a fullswaged circular saw. The swaging is side dressed orshaped to a uniform width with an under and backcut in order to leave the extreme point of tooth atrifle wider than the rest of the tooth. The fullamount of swage when side dressed should never ex-ceed No. 8 gauge in a 14 gauge saw and for hardtimber may be even less. It is advisable to run withas little swage as practicable. The tensile strain on
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfurnitu, bookyear1922
