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| HH. Grinding rest |
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| vtsteam:
--- Quote from: DavidA on October 27, 2013, 12:47:58 PM ---I don't want to look too silly here, but it appears to me to be upside down. Surely the contact should be on the slope. And the gib stip should make this happen. Dave --- End quote --- --- Quote from: ziggar on October 27, 2013, 01:40:26 PM ---it IS upside down the larger squarer piece should be the uppermost part --- End quote --- It doesn't make any difference whether he sets it upside up or upside down on a workbench for the purpose of a photograph. We're talking about a fit of two parts. Yes a gib ALWAYS forces a dovetail to contact the opposite slope, AND either the shoulders OR the bottom of the slot, depending on the intent of the designer. In this case, according to the drawings, it's the bottom. In the case of most dovetail slides on the lathes I have seen, it's on the shoulder. For most dovetails, using the shoulders as bearing surfaces reduces friction when sliding. Using the bottom (or base) of the dovetail increases friction, but that may be an advantage where you intend to lock a short part into its ways. |
| flutedchamber:
Could someone please tell me where I can find the original Harold Hall post about the grinding rest? I can't find it using the search feature. Thank you. |
| flutedchamber:
Found it... :thumbup: |
| John Rudd:
Had another think about this..... The 8.5mm depth on the lower slide is fixed by the angle and across top dimension of 32mm.... So having cut the swivel plate angles too, with the 10mm width on one side again, there is correlation between the angle and depth... So I think I'm looking for a problem when there isn't one, plus I've looked at the book again and have a warm feeling abou it all ... But I'll wait from the Maestro Himself I'll post his response once I have it......This should resolve all.. :lol: |
| Metalman:
I have over the years had a number of questions regarding the grinding rest that result from the very small scale of the assembly drawing in the book. Because of this, I added to my website some time back an enlarged assembly drawing of the top half of the rest. This can be found at http://www.homews.co.uk/page145.html. The link being in the bottom line of the text. If there is any one reading this thread that are unaware of my website the home page is at http://www.homews.co.uk/index.html but the best place to start for the metalworking content (now around 500 pages) is at the book style index at http://www.homews.co.uk/page463.html Also, I have started to add galleries showing a number of setups for a given situation, typically, Using the faceplate. The index for these is at http://www.homews.co.uk/page542.html there are though a lot more to come. I would add that I have already mailed John directly with some help and telling him about the larger drawing which should answer his questions. Harold Hall |
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