2020 John Stevenson Trophy

Hi.

I read the article in the October magazine with interest, but I must admit to not understanding how the device is constructed. No doubt somebody will be able/willing to explain, please.

My observations:

There are two bolts on the mounting block. The bottom one controls/locks the horizontal rotation of the rod. The top bolt controls the rotation of the rod, and its horizontal position. If this bolt is tightened the rod is locked, if it’s left slack, to allow rotation, the rod/diamond will be free to move in and out.

I therefore presume the height and rotation of the vertical arm must be controlled by the ‘assembly’ attached to the end of the rod. However how the assembly is attached to the rod eludes me, there is a small protrusion at the end of the rod, but it is difficult to see how the assembly could be attached to that.

The assembly appears to comprises a bolt, a cone, a spacer and a nut. Its purpose being to secure the vertical arm to the rod, whilst allowing the vertical adjustment of the vertical arm/diamond. Once the vertical position has been established, tightening the nut, to hold it, will prevent the diamond from swinging across the face of the wheel.

The small bar at the rear end of the main rod appears to have no function, and the author refers to adjusting a ‘fine feed’. Were there additional photos showing the construction?

Any help understanding all of this would be greatly appreciated.

Many thanks Noel

Hi Noel,

I have just found your comments on my grinding wheel dresser, and I apologise for such a late reply.

As to explaining how it works. It is just a fixed horizontal pivot rod mounted above the grinding wheel. The pivot rod is hollow and has a threaded adjustment screw protuding at the furthest end from the grinding wheel.This is to allow fine adjustment of the vertical arm assembly depth engagement with the grinding wheel. The vertical arm assembly is free to rotate on the horizontal pivot rod and enable the diamond to engage with the grinding wheel, the depth of engagement is set by the adjustment screw. The vertical arm assembly can be removed or slid away from the grinding wheel when starting the grinder and slid forward then rotated on the horizontal pivot to be swung across the grinding wheel face to dress the wheel. After dressing, the vertical arm assembly is withdrawn on the horizontal pivot rod and the grinding wheel is switched off for inspection.

I hope this clarifies the operation

Alan

Edited By Alan Jackson on 07/01/2023 11:40:44

Hi Alan. Many thanks for the reply, I’ll have another look and use your description. Cheers Noel

HI Noel,

A while ago I slightly remodeled the design in Solidworks. The fixed horizontal pivot is now a solid bar and the fine adjustment is now on the centre of the vertical arm assembly. I have shown the two separate components parts duplicated. Hope this explains things. The submission for the trophy only allows about four or five photos and a limited text so that limits an extensive description.

Edited By Alan Jackson on 07/01/2023 17:39:32

As the dresser presumably moves in an arc across the grinding wheel am I correct in assuming the face of the wheel will be either slightly concave or convex?

Edited By Alan Jackson on 07/01/2023 18:03:46