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30th April 2009, 07:30 PM #1
needing help from a draughtsman/math
Wanting to make a new box with contrasting strips upto 16 sections or any better convenient number.
Need help to calculate what angle and width to cut the strips which will be 10mm thick.
~Then will post a WIP.
Ends will be capped and a slice taken off of top to create opening for box, most probably will build round a former. It might help to have a waste piece which will loose 3.2mm when cutting open with tablesaw.
Thanks in anticipationwoody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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30th April 2009, 07:39 PM #2
A bit of help from the segmented turning world is needed.
After all, you are only making a bowl with straight sides
This site will give all the info you need.John
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30th April 2009, 07:59 PM #3
Thanks for above link, however I do not have a lathe and equipment to cope with the segments internally (using those tables),
I want to build round a former and have smooth sides internally.
I have bookmarked the site and posted at the uk forum for turners which I am sure they will appreciate.woody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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30th April 2009, 08:33 PM #4
360°/16 segments = 22.5°
So the edge angle of every strip is half that, giving... 11.5°
Perimeter = Pi x Diameter, so 90 x Pi = 28.27cm all the way around. Divide that by 16 strips and each one needs to be 17.67mm at their widest point.
It's not rocket science.
- Andy Mc
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30th April 2009, 08:37 PM #5
Thanks Skew, you made that so simple, I had that lesson at scholl around 60 years ago and my brainbox has become cluttered since.
My next thought is that I will cut the top off along its longest length and loose that 3.2mm so I suppose I shall have to cut replacement lenths to maintain the line. I shall most probably put the tube on my small lathe that I use for pen turning.woody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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30th April 2009, 09:14 PM #6
Sorry jow, I wasn't having a dig at you with that last line.
I meant that my calculations aren't spot on: the 17.67mm is for the "arc length" per segment and not the width of the slats. But it gives you a ballpark figure that errs slightly on the side of "too wide." Which I reckon is way better than "too thin."
If you want the accurate figure, I'll have to find my calculator. I remember the formula to use, but don't have the head for plugging numbers into 'em any more.
- Andy Mc
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30th April 2009, 09:21 PM #7
Busy at the moment, but zenwood gave a thread on this subject a fair while ago. Search......zenwood...coopering........ that may do it. Accurate as all get out.
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30th April 2009, 09:40 PM #8
January last year!
Thanks
https://www.woodworkforums.com/showth...wood+cooperingwoody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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30th April 2009, 11:51 PM #9
Correct, except half of 22.5 is 11.25 degrees, if you can measure that close. Similar for width (to accuracy of 0.05mm?!!!)
Measure three times, cut twice, sand to fit.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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1st May 2009, 12:02 AM #10
Jow
here's a pair of templates, designed for printing on A4 paper
ian
I needed the practice
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1st May 2009, 12:18 AM #11
Thanks all.
I have decided to try and build the coopered box inside a former.
A cardboard whisky bottle holder in card, so it should peel away from the timber strips which will be laid and glued internally.
The inside diameter is 87mm (that was a bit of luck) which should total about 273.1 mm circumference, 16 segments would be 17.07 width but 14 segments would be easier 19.5.
angles would be 16 = 11.25
or 14 = 12.85
So will start a new thread over at boxmaking shortly.woody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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1st May 2009, 12:23 AM #12
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1st May 2009, 12:41 AM #13
no worries
as I said, I need the practice.
would you like a second template?
also, I'd be very leery with working inside a former.
glueing and clamping would be much easier if you clamp from the outside.
I suggest building a former from 5mm ply or MDF
ian
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1st May 2009, 02:54 AM #14
Thanks again Ian, a template would be an additional luxury.
I'm still inclined to build inside and will fit temp. bulkheads, also I have the idea that I might be able to stop at the three quarter level and then start again so creating a llid.
Its pis ing of rain and cold today outside and I have an appointment tomorrow so roll on saturday.woody U.K.
"Common looking people are the best in the world: that is the reason the Lord makes so many of them." ~ Abraham Lincoln
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1st May 2009, 10:09 AM #15
Is this what you are seaking?
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