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28th February 2023, 12:24 AM #76
Bed time indeed, To be continued....
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28th February 2023, 11:58 AM #77
Vise Record.jpg [Photo: Derek C]
Sam, here a a fair discussion on the Record vise:
In Praise of Record QR Vises - Paul Sellers' Blog
If you choose to go down that path, remember the English stopped making them quite a few years ago, but there are copies available of varying quality.
There is a definite hierarchy:
- Genuine second hand Record vice - mostly excellent,
- Taiwanese generic copies - mostly OK,
- Chinese generic copies - mostly crap.
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28th February 2023, 12:10 PM #78
I had the same problem, Derek, albeit with an end vise. I did not like scoring the chop when marking the pin board.
Temporary solution: Chops are consumable; tell yourself that it will be replaced and it doesn't matter. Inner voice says "crap".
Permanent solution: Put a spacer under the tail board, raise the pin board so that it is flush with the underside of the tail board, mark pin board. The knife is now sufficiently clear of the chop vertically not to mark it.
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28th February 2023, 12:30 PM #79
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28th February 2023, 01:04 PM #80
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28th February 2023, 01:22 PM #81
I was talking about under Dereks top . Not a BBE on his top .
Your drawings look good . You don’t necessarily need a BBE if it’s braced up underneath.
Even without bracing the cast body of that metal vise will brace a top . Better to add some more though with timber .
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28th February 2023, 01:31 PM #82
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28th February 2023, 05:45 PM #83
Here's the vise mounted. Carbatec doesn't give the exact dimensions of how wide the jaws can be set, unless I'm missing something?. Anyway I've given the apron dimensions of the underside of the table in the final photo:
vise4.jpg vise5.jpg
Two things that concern me, one, I don't know what the clamping capacity will be because I cant find any dimensions, two, the back plate will only be attached to 12mm plywood, though I can make that thicker if need be.
Whats the minimum clamping capacity I should have?.
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1st March 2023, 09:09 PM #84
@GraemeCook, did you get the CAD file I sent you?.
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2nd March 2023, 10:25 AM #85
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2nd March 2023, 11:37 AM #86
Hi Sam
I couldn't down load your drawing so I redrew it, albeit a little simplified, but it will work.
As you know, the essential parts of a woodworking vise include the fixed rear chop or cheek and the movable front cheek. They take quite high workloads and that load may be quite concentrated; cheeks have to be robust. Bending and twisting is their enemy!
Now a brief critique of your drawing.
Your fixed rear cheek effectively consists of five component parts, which I have numbered:
- Two legs - #1 & 2,
- Two pieces of rail - #3 & 4, and
- End of top - #5.
Sam - Parts 1.jpg Sam's Drawing
In my view, this arrangement is subject to flex or bending at the intersections of all components. These are stress points.
May I suggest that you consider putting a fixed rear cheek, say 25 mm thick, in front of your existing arrangemeet. This will then spread the load across all five component parts and eliminate those stress points.
Sam - Parts 2.jpg Graeme's simplified drawing
Sam - Parts 3.jpg Full width fixed cheek added
Sam - Parts 4.jpg Mobile front cheek added
The mobile front cheek may be full width or customised as in your drawing. The extra thickness of the fixed cheek will reduce the opening capacity of the vise, but this can be minimised by partly recessing the steel vice mechanism into the rails.
Hope this makes sense.
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2nd March 2023, 03:45 PM #87
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2nd March 2023, 06:48 PM #88
I have a question. Should the threaded rod be in the centre of the chops?, as the vice I have has
the threaded rod off centre of the two steel rods and front plate:
IMG_9201.jpg
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2nd March 2023, 07:57 PM #89
I've since found out its off centre so to allow vertical clamping, however it doesn't say whether you mount the front plate in the centre of the chop?.
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3rd March 2023, 01:09 PM #90
Essentially, yes. It is the first line of defence against racking.
If you put a piece of timber towards the outside edgen of a vise and tighten it, then everything may twist a little and, counter-intuitively the amount of grip will deteriorate as you increase pressure. The situation (above) when the front cheek is not parallel to the fixed cheek is call racking. A big part of vise design, installation and use technique is to minimise racking.
Simplest solution is to put a pressure equalisation block on the other side of the vise jaws.
Here is an explanation and one person's solution. I just use a series of chocks - make a new one when needed.
https://www.google.com/search?client...4-EPoYeR-A0_42
Sam, may I suggest that you read up on racking, and come back when you know what questions to ask?
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