Metal Lathe for Home Machinists by Harold Hall

Author:Harold Hall [Hall, Harold]
Language: eng
Format: epub
ISBN: 978-1-56523-693-6
Publisher: Fox Chapel
Published: 2012-02-23T05:00:00+00:00

3. The bore for the smaller holder being made.

4 and 5. The shank of the smaller holder being made using left and right hand knife tools whilst supported by the tailstock centre.

Start increasing the diameter and boring to a depth of 6.5mm. If you own a “saddle stop” (see Photo 12, Chapter 12) then set this to control the depth using the saddle to feed the tool. Having managed without a saddle stop for many years I soon learnt its considerable advantages once I equipped myself with one, and would urge you to make one as the time will be repaid many times over. Setting the stop is a job for the distance gauges made in chapter 6. Select gauges to the width of 6.5mm (5 + 1 + 1/2) and, using the saddle’s advance wheel, grip them between the end of the stop adjusting screw and the saddle. Then, with them in this position, advance the top slide until the tool just touches the face of the part to be bored (lathe not rotating). Remove the distance gauges and the depth of bore will be exactly 6.5mm using the saddle to advance the tool. Do not move the top slide.

If you do not own a saddle stop then it will be necessary to control the depth by observing the top slide dial. Lock the saddle and bring the tip of the boring tool up to the face of the workpiece and zero the micrometer dial. Set the depth of cut using the cross slide and bore to a depth of 6.5mm using the top slide using its dial to set the depth. Continue increasing the diameter until the bore arrives at 13/16in. (dies are made to imperial dimensions). On the final cut feed the boring bar deeper by 0.05mm and wind the boring bar to the centre, by so doing facing the base of the bore. If this does not result in a clean finish place a further cut of 0.05mm and face the base again, repeat as necessary. With a right hand knife tool, machine the outer end face doing this until the depth of the bore measures 1/4in.

Next centre drill the base of the bore followed by removing the steady and supporting the part with the tailstock centre. The next task Is to make the 14mm diameter spigot on the rear, first with a left hand knife tool, Photo 4, also establishing the 20mm dimension at this stage. Then with a right hand tool, (Photo 5) continue to increase the length of the 14mm diameter. To ensure both parts of the spigot are the same diameter, mark the first part with a light ring of marking blue. For the final finishing cut with the right hand tool, this can be advanced until there is just evidence of the tool touching the blue area and the second end turned to finished size. Make the spigot 34mm long to enable parting off to take place at this reduced diameter.

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