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Harold Hall

Workshop Projects

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Stop (2), Pin (3) and Feedscrew (5)

These are simple turned items and no comment is required other than to say drill also the hole B in the stop.

 

Body (4)

Place the piece of 25mm square steel into the four jaw chuck and face the end. Next, drill completely through 6.5mm diameter followed by 8.1mm diameter 33mm deep and finally 12.1mm 18mm deep. Reverse in the chuck and face the other end.

 

Fully screw the feedscrew into the stop and place these in the body and secure with an M5 screw and use the stop as a jig to position hole D making it 2mm diameter, Photograph 4. Remove the stop and open up hole D to 3.2 diameter but only 10mm deep at this stage.  Drill also holes F.

 

Loosely assemble the pin into the stop and these into the body and rivet over the end of the pin. This ensures the pin is axially in line with the hole in the body. The depth of hole D can now be increased as per the drawing.

 

Dial (6)

Whilst the calibration on this is theoretically in 1 thou divisions, accuracy is of little consequence, their purpose purely to allow small increments to be set on with ease. Mark the edge, say 2mm wide, with marking blue and place this centrally over the template provided and scribe a line at each mark. Photograph 5 shows my effort, not very elegant but adequate. However, if you have the time, and a dividing head, a more engineered result can be obtained.

 

Support (7)

This shows the support that I made to suit my Black and Decker Professional grinder and is the only part that will need modifying for other makes but the basic idea should be OK. Do note that the important dimension is that the eventual height of the top of the table should be 6mm below the centre of the grinder,s wheel. Accuracy is not that important as clearance in the holes can be used to finally set the angle.

 

With the support made, hole C in the table can be now be added to the table, see Sk. 2. The easy way to check the 25° angle is to cut a piece of card with an internal angle of 115° and mark this at 12.5mm above its base, not measured along the sloping edge. Place the base onto the table and check that the angle contacts the wheel at the mark, or thereabouts. The same method can be used to check the 5° for the primary clearance.

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