Harold Hall

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To complete the turning operations return the workpiece to the three jaw and create the 20mm diameter bore completely through the part. This is just a generous clearance for the spindle so accuracy is not required. The tapped holes will be detailed later.

Drive Spindle Carrier (22)

This being one of the many rectangular parts, it should be, cut to size, marked out and drilled en masse with the similar parts. However, do mark out the position of the 16mm hole, just centre drilling this and initially drill the four holes around this tapping size for M3.

Mount the carrier on the faceplate using the tailstock centre to set its position. In my case, rather than using a conventional faceplate, Photograph 12 shows that I used my Four jaw alternative chuck base . The chuck has some tee nuts to fix the jaws with two tapped holes rather than the usual one. These I used with a jacking screw in the outer hole to support the clamp bar and the inner one to clamp the workpiece. This I found much simpler than using a conventional faceplate as there were no fixings to work with on the rear.

With the item mounted, bore the 40mm making it a close fit on either the Drive Spindle Body or the Outer Clamp Ring whichever is the larger, the reason for the Outer clamp ring being included becoming apparent later.

The 16mm bore needs to be concentric with the bore just made but its diameter a little on the large size, say  plus 0.05mm. With the carrier complete it can be used as a template for drilling other parts.

12

13

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Design        

considerations

Oscillating  

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File Carrier

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VariableStroke

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Lathe mounting

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As the four holes are unlikely to be accurately on a PCD it is improbable that the parts will assemble randomly, therefore add centre punch marks where appropriate to aid positioning the parts when assembled later.

Use the Drive Spindle Carrier as a jig for drilling both the Drive Spindle Body, Photograph 13 and the Outer Clamp Ring with the later then being used as a template for the holes in the other end or the body. With that done the holes in the three parts can now be opened up, counterbored or tapped as required.