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Harold Hall

The design includes supports for both sides of the file/saw and can be swung left and right or moved forward and backward, as seen in Photographs 37 and 38, also being adjustable for thickness up to 25mm.

 

The main drawing shows the assembly fitted in front of the rear upright where it will be the most ridged due to the shorter reach. If though a greater throat depth is required it can be fitted at the rear, as seen in photograph 38, or left off when not needed. Being secured with a single clamp screw, fitting and removal is a very quick operation.

 

Manufacture

This is so simple, especially compared to the filing machine itself, that really no advice is necessary. However, there are eight cross drilled holes, a requirement that is fraught with problems, that is unless you have some facility for producing them. Photograph 39 shows that I used my Hemingway jig for these and whilst still in the jig tapped those holes requiring it using the Auto feed tapping mechanism (a very grand title for a very simple piece of equipment) from my tapping stand, Photograph 40. If tapping is not one of your favourite operations then making this tapping stand is worth a consideration.

 

To give an idea of the extent of work involved in making the hold down assembly Photograph 41 shows the full set of parts prior to assembly. However, a couple of points about the design may not be out of place. The angled face on the main support mount (8) is included so that when the pillar is secured there will be an element of downward pressure onto the base (4) rather than just preventing rotation.

Filing Machine, with hold down facility.
Filing Machine, with hold down facility.
Cross Drilling,
Cross Drilling, tapping.
Filing Machine, hold down components.
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37

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38

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39

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40

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41