04 Accessories and Attachments (2).pdf

Both straight and taper turning may be performed on a

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both straight and taper turning may be performed on a workpiece in one setting without much loss of time. 2) Once the taper is set, any length of a workpiece may be turned taper within its limit. 3) Very steep taper on a long workpiece may be turned, which cannot be done by any other method. 4) Accurate taper on a large number of workpieces may be turned. 5) Internal tapers can be turned with ease.
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Taper turning by Form or Broad nose tool A broad nose tool having straight cutting edge is set on to the work at half taper angle, and is fed straight into the work to generate a tapered surface. The half taper angle will correspond to 90 minus side cutting edge angle of the tool. This method is limited to turn short length of taper only.
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Taper turning by Combining Feeds More specialized method of turning Both longitudinal and cross feeds are engaged simultaneously causing the tool to follow a diagonal path which is the resultant of the two feeds
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Attachments – Thread Chasing Dial Figure: Thread Chasing Dial
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Example A shaft of 1200 mm long should have a taper of 1 in 200 for a length of 600 mm. the maximum diameter of the shaft is 75 mm. determine the minimum diameter of the shaft and the amount of setover. Sol: 1 75 200 600 72mm 75 72 Setover = 1200x 3mm 2 2x600 d d D d L l - = = - - = =
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Example Calculate tailstock offset required to turn a 1:30 taper X 60 mm long on a workpiece of 300 mm long. The small diameter of tapered section is 20 mm. Sol: 1 20 30 60 22mm 22 20 Setover = x 300x 5mm 2 2x60 D D D d L l - = = - - = =
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Example Determine the angle at which the compound rest will be swiveled when cutting a taper on a piece of work having the following dimensions: (i) outside diameter of the rod is 60 mm, (ii) length of the tapered portion is 80 mm, and (iii) smallest diameter on the tapered end of the rod is 20 mm o Sol: 60 20 tan 0.25 2 2x80 The rest should be swivelled at an angle, 14 2' D d l α α - - = = = =
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Tailstock Back
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  • Winter '15
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  • Lathe, Lathes, Half Center

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