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Thread: Maximum thickness
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3rd February 2014, 08:48 PM #31
Which leaves the board 11mm thick in the middle and 12mm thick at the ends.
Then one wold run the surfaced board through a panel planer to make the second side parallel to the surfaced side. The board would end up 10mm thick, theoretically, that is. The correct answer, theoretically, would be 10mm..
Jim
OR
Hand-plane 1mm from the middle where it bows upwards, tapering out to nothing at the ends.
Next, flip the board and hand-plane the ends by 1mm, tapering out to nothing at the middle.
We are talking theoretical, and theoretically it should be possible to take 1mm from one part of a board but not from another.
It's perfectly clear to me, and I thought my drawing was too.
Actually, in my opinion, the onus is on the OP, who provided both the question and the answer, to prove his case. It's not up to me. I'm just another 'guesser', and my guess is 11mm.... Steve
-- Monkey see, monkey do --
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3rd February 2014 08:48 PM # ADSGoogle Adsense Advertisement
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3rd February 2014, 09:03 PM #32SENIOR MEMBER
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Some days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.
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3rd February 2014, 09:11 PM #33
Forget the planer and thicknesser if they can't do it. If you take a hand-plane and do it exactly as shown in my earlier sketch, you'll end up with an 11mm board. (In theory, not practice. In practice none of us could do this because we don't have enough control over the plane.)
Don't forget, we're not looking at what you get 'in practice', using a buzzer etc, but the 'theoretical' answer. 'In theory', under 'ideal' conditions, you should be able to remove the exact amount of wood that's needed.
Not trying to get into arguments, by the way, but can't help supporting my view.... Steve
-- Monkey see, monkey do --
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3rd February 2014, 09:12 PM #34
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3rd February 2014, 09:16 PM #35Deceased
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3rd February 2014, 09:37 PM #36SENIOR MEMBER
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Some days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.
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3rd February 2014, 09:41 PM #37
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4th February 2014, 09:43 AM #38Sometimes in the daily challenges that life gives us, we miss what is really important...
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4th February 2014, 10:23 AM #39SENIOR MEMBER
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4th February 2014, 10:48 AM #40
No I don't agree with Hermits drawing. With a 1mm cup in the board, the board now becomes 13mm thick not 12mm thick, theoretically.
Been an interesting exercise. Perhaps the moderators can see fit to include a "Conundrums" component to the board?
JimSometimes in the daily challenges that life gives us, we miss what is really important...
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4th February 2014, 10:55 AM #41Deceased
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If we look at it theoretically I'm wondering why you would plane it all. To retain the full 12 mm you would steam bend it back dead flat and dead parallel by clamping between two straight pieces. Bit of work but it saves the one or two mm. and is easier then planing.
Of course that would be a flat work exercise and real turners don't do that kind of thing.
Peter.
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4th February 2014, 10:56 AM #42
Jim, the board is not 'cupped' or 'twisted', only 'bowed'.
Second, it can only be 13mm if you include air. Air doesn't count as part of the thickness of a board.
I don't know how you can disagree with the drawing. It says it all.
This isn't a conundrum - it's a plain logical exercise, with only one possible answer - 11mm.
Forget thicknessers, buzzers, etc and look purely at the logic of removing unwanted material only where necessary as shown in my sketch.... Steve
-- Monkey see, monkey do --
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4th February 2014, 11:00 AM #43
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4th February 2014, 11:04 AM #44Deceased
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4th February 2014, 11:28 AM #45SENIOR MEMBER
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I agree 13mm.
Theoretically you remove 1mm off each side to make it flat.
13 minus 2 = 11mm
The answer is 11mm
Jim I know you can add up because you have to count all them little bits of wood before you stick them back together.
I think you are not serious and just having a stir?love it!
Just to change track.
Isn't it great that we can all be in different parts of the country and have a debate like this.
Even if half of you are wrong.
Cheers
TimSome days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.
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