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HH. Grinding rest

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John Rudd:
Gents,

I started building Harold Hall's grinding rest........


I've hit upon a problem...
Having cut the dovetails for the lower slide block and the two 16mm thick slide swivel pieces, I find that when I offer up the lower slide to either of the swivel blocks, there is little support on one side of the dovetail.... The side where the gib strip goes..

I'll try a picture later to hopefully explain better


Anyone I any idea what's gone wrong? What have I missed ?

vtsteam:
Looks like there should be about 5mm of metal there. Is that what you have?

(nope, that's wrong..........hang on, checking....)

I make it out to 5.38 mm.  If your piece width is under 50mm it will reduce that.

Do you have 10 mm at the top of the dovetail?

John Rudd:
ok,

Here's a crap-o-cad sketch of how it's fitting together.....and how it doesnt work out....
Basically if I offer up the lower slide and insert it into the swivel block, the side where the gib strip goes has virtually no landing area supporting the lower slide

DavidA:
John,

What is the MEW issue number for this item (or are use building it from another source) ?

Dave.

John Rudd:
Its from HH's book ...'Milling a complete cock upcourse'

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