Harold Hall Grinder Rest – modification; and triple expansion update.
Harold Hall has written many articles and several very useful books about metalworking, using a lathe, using a mill, and much more.
Recently he has been posting videos on YouTube.
He is a very knowlegable, dignified, elderly gentleman. His books are precisely, beautifully written, and the plans and projects are excellent. I have made quite a few of the project pieces in my quest to learn as much as I can about machining metal.
I came across his Youtube videos quite recently, and have been enjoying them. One of them was about his grinding rest.
I made 2 of the HH grinding rests from plans in his book, and they have proved to be useful, reliable, and compact. Here is a photo of one of them.
The original HH plans specify that the footprint of the base is much smaller than I made it. This one is 200 x 100mm. The larger footprint adds some extra stability (IMO), and the slots permit the grinder to rest distance being easily adjusted. It is a bit grimy because it is used frequently. Polishes up quite nicely.
In HH’s video he mounts the rest on a metal plate, joined with a couple of switchable magnet bases. Here is a link to HH’s Youtube video.
And in case you are wondering what has happened to the triple expansion engine, I have been working on the reversing mechanism. The intermediate cylinder reversing curved slide would not fit into the available space, so I removed it, silver soldered in a new end, and ground it several millimeters shorter. Then reinstalled it. It is still a mm or so too long but I think that it will do.