Turning larger thread pitch on ordinary lathe

In the C620 turning machine, the increased pitch thread, the lead at 13 ~ 24mm and the modulus at 3.25 ~ 6mm, according to the signs, the spindle speed must be pulled to the middle gear, the handle B in the box in the I The location of C in the location of II. Please see Table 1C620 Lathe turning larger thread pitch tag. We found out in the production that when the turning lead is 13~24mm and the module is 3.25~6mm, as long as the feed box handle is adjusted to the position of B in I, C is in the position of II, the spindle speed is switched to Low gear, as shown in Table 2's own modified signage. In this way, during finishing, low-speed turning can be used to reduce vibration, reduce surface roughness, and improve the quality of the workpiece. Table 1 Metric thread exchange gear 42:100 (increased pitch) Modulo thread exchange gear 32:97 (increased pitch)

Each handle position of the gearbox Each handle position A of the gearbox moves to the metric position to the metric position B I II I II I II I II C II II I II II II I II Infeed handle 1 13 26 52 104 3.25 6.5 13 26 2 14 28 56 112 3.5 7 14 28 3 16 32 64 128 4 8 16 32 4 18 36 72 144 4.5 9 18 36 5 19 38 76 152 6 20 40 80 160 5 10 20 40 7 22 44 88 176 5.5 11 22 44 8 24 48 96 192 6 12 24 48 Table 2 Metric Thread Exchange Gears 42:100 (increased pitch) Modulo Thread Exchange Gears 32:97 (increased pitch)

The handle position of the gearbox Each handle position of the gearbox A Move to metric position Move to metric position B I II I II I II I II C II II I I II II II I I II Infeed handle 1 13 26 13 52 104 3.25 6.5 3.25 13 26 2 14 28 14 56 112 3.5 7 3.5 14 28 3 16 32 16 64 128 4 8 4 16 32 4 18 36 18 72 144 4.5 9 4.5 18 36 5 19 38 19 76 152 6 20 40 20 80 160 5 10 5 20 40 7 22 44 22 88 176 5.5 11 5.5 22 44 8 24 48 24 96 192 6 12 6 24 48

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