A Simple Grinding Rest.


Credit for this design goes to the late Rudy Kouhoupt. This design was heavily based on his grinding rest from volume two of his 'Workshop Wisdom' Series. It was merely adapted to suit my grinding wheel and the materials to hand.

I am unable to re-produce the plans here due to copyright, but the images of the construction should allow a similar jig to be made by others.

Please note the comments at the end of this article, which explain some if the shortfalls of this design and some improvements **.

A Simple Grinding Rest

The grinding rest design, was a flat table surface set at the wheel centre height, which was allowed to tilt into, and away from, the wheel. Within this table a slot was used to house a sliding bar, and this bar was used to hold an angle adjustable fence.

 

 

 

 

 

 

 

 

The frame was three pieces of steel plate welded to form a 'U' shape. The base part of the 'U' was extended each side to provide mounting holes for the rest. The sides were machined as a pair and were clamped either side of a block of wood to ensure they were aligned on the base before welding.

The pivot bolt was a roofing screw with a square shoulder on the inside. This would allow for one handed clamping of the table tilt. One of the mounting holes had to be filed square to accommodate the bolt shoulder.

Grinding Stand Base

 

 

 

 

 

 

 

 

The table could be machined from solid but this one was made in 3-parts. One large block of steel for the base, which would be drilled right through to take the pivot bolt. And two pieces of aluminium screwed to the top and spaced so that the chosen piece of sliding bar was a nice sliding fit between the two parts.

Two pieces of aluminium made up the top of the table. Spaced so that the sliding bar was a smooth fit.

 

 

 

 

 

 

 

 

The sliding bar was drilled and tapped in the centre to take a 6mm bolt. This bolt was used to hold a piece of brass angle, which would be the adjustable fence.

 

 

 

 

 

 

 

 

** The grinding rest was satisfactory but a better design would have the siding bar closer to the grinding disc. This would remove the problem of the fence being too far away when used at angles near parallel to the disc edge (see right).

A table of this type would be more easy to make if it was made from two parts rather then three, so there would be no need to accommodate screws along the front edge, enabling it to be much thinner.

Fence not close enough to disk for this cut on the top face of the tool.

Another issue was the linear adjustment of the stand. When the table tilt was adjusted, the stand would often need to be moved away from, or towards, the disc. For this reason the holes in the base (or the bench) had to be oversized to allow the stand to be repositioned. This repositioning was a fiddle but thankfully for most tool angles the table tilt was similar and this adjustment was not needed. The need for this adjustment could also be minimised by having the pivot bolt as close to the disc as possible.

 

 

 

 

 

 

 

 

Finally it was discovered that when grinding a normal right handed tool on the left-hand wheel, the tool could catch the grinder housing (see right). Therefore the stand was moved to the right hand wheel where this was no longer a problem.

A shorter tool would of course be another solution.

 

Despite these issues, the stand was a massive improvement on the fixed plate that originally came with the grinding machine. This article shows the rest in use and gives a simple explanation of tool grinding.

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