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Harold Hall

Workshop Processes

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Again the fence is set so the grinding is done on the wheel's corner and is fitted with a stop screw to avoid the wheel contacting the next tooth, this being set precisely by the X axis traverse. The Y axis controls the amount being ground off. The photograph shows a large tooth saw, but with a wheel dressed to have a sharp corner saws with small teeth can easily be sharpened. A point worth noting is that the fence and the swivel base are the same thickness, as a result the fence also supports the saw,  this is also beneficial in some other setups,  typically as in photograph 9.

 

The end mill attachment

For the reader who is undecided whether to make this or not I will provide a few photographs that illustrate its use beyond just sharpening an end mill's spiral cutting edges. However, even though it can carry out the tasks a little easier than the methods used without it they do not justify the time taken unless the reader wishes to make it largely for the satisfaction gained.

 

Photograph 21 shows the side edges of a dovetail cutter being ground. The attachment has been fitted with a six tooth ratchet which has also been secured so as to eliminate the end wise movement that is required when grinding the spiral flutes of an end mill. Compare this with photograph 19.  I have included the photograph in full rather than a close up as it shows that for this one I placed one magnetic base in the centre and mounted the rest at the end. This enabling me to get the rest well over to the left for the task, showing the adaptability of the method, see page regarding this method of mounting the rest.

 

The setup in Photograph 22 enable the end teeth to be ground with a sweeping movement rather than being plunged, achieving a better looking result. However, as the edge only cuts on its tip this is rather academic. The six tooth ratchet mentioned above has been replaced with a four tooth ratchet which is clearly seen. Also the fence has a stop at the far end to prevent the adjacent tooth contacting the wheel. Compare this with photograph 17.

 

The attachment can also be used for parts that just need to be rotated when being ground, such as a centre punch or a punch for use in a press tool. Photograph 23 shows a centre punch being ground. The leaf spring has been disengaged from the ratchet enabling the spindle to be rotated freely. Also, rather than making a collet just for the diameter of the centre punch shank an adaptor has been made to use with one of the collets, the adaptor can be seen in the photograph. The angle of the point is set by pivoting the table and the attachment fixed to the table by being clamped between the fence behind and the screw seen in front. The Y axis traverse controls the depth being ground.

Tool and Cutter Sharpening, Dovetail Cutter
Tool and Cutter Sharpening, End Mill
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