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Gary R Webb
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size
Apr 19th, 2013 at 10:10am
 
What is the proper width of the wood should be before you start cutting the segmented parts for a 12 sided ring smiley=dankk2.gif    Spider
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Ron Sardo
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Re: size
Reply #1 - Apr 19th, 2013 at 10:23am
 
Depends on the size and the curvature of the finish piece.

My online segment calculator will give you the dimensions you require
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Gary R Webb
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Re: size
Reply #2 - Apr 19th, 2013 at 10:29am
 
thank Ron I'll try to figure it out from there but it makes my head hurt
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Ron Sardo
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Re: size
Reply #3 - Apr 19th, 2013 at 12:09pm
 
If you have questions on how to use it just ask
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Gary R Webb
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Re: size
Reply #4 - Apr 19th, 2013 at 2:45pm
 
Ok I went to the calculator and typed it a 4" circle got
o/s length 1.2057713659400522
i/s length  .5176380902050415
thickness 1.284074173719318
cut angle 15  the only thing I understand is cut angle I have no ruler that measures those long winded numbers I only finished high school..... bang head
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Ron Sardo
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Re: size
Reply #5 - Apr 19th, 2013 at 3:05pm
 
Let simplify the numbers to two decimal points

o/s length 1.20 (Final dimension of the outside of your segment)
i/s length  .51  (Final dimension of the inside of your segment
thickness 1.28  (Board Width)

What did you use for your (final) ring thickness? I'm thinking you used .75".
Is this how thick you want your finished project?

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Gary R Webb
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Re: size
Reply #6 - Apr 19th, 2013 at 3:37pm
 
yes I used.75 for thickness I think the final thickness should be less ten 1/4 closer to 1/8 I would think.  if the 1st ring is 4" how big should the next ring be
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Ron Sardo
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Re: size
Reply #7 - Apr 19th, 2013 at 3:51pm
 
Then you should use .25 instead of .75

How big the next ring depends on your design. What type of profile are you going for? How tall is your ring?

Draw it out on graph paper
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Gary R Webb
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Re: size
Reply #8 - Apr 19th, 2013 at 4:12pm
 
ok thanks Ron the .25 makes more since now it's starting to fall into place smilies=bowdown
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Ed Weber
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Re: size
Reply #9 - Apr 19th, 2013 at 4:31pm
 
Be careful not to short yourself on material. In Ron's diagram, the wall thickness is a best case scenario, where everything is perfect.
If your cit is off
If your angle is off
If you sand more than you should
If you decide to alter the shape a bit
If you don't have your piece perfectly centered on the lathe,
These are just some of the reasons you can come up short. Just because your final wall thickness is 1/4" or 1/8", don't cut it so close (literally). Use material thick enough that you have a little cushion on both sides, that's inside and outside.
Remember, whatever you glue up, that's it, that's all you have to work with.
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Ron Sardo
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Re: size
Reply #10 - Apr 19th, 2013 at 4:43pm
 
I couldn't agree more with Ed.

There is an input field for fudge factor that is set for .25 and can be changed to whatever you wish. This field adds extra width to cover those items he mentions. For a beginner it can't hurt to have to much. Try .5 or more to get you started.
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Ed Weber
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Re: size
Reply #11 - Apr 19th, 2013 at 5:13pm
 
Ron Sardo wrote on Apr 19th, 2013 at 4:43pm:
For a beginner it can't hurt to have to much.


Not just beginners  Roll Eyes
I am not familiar with your calculator Ron, I wasn't aware it had that function< sorry
I use a product called SPP or segmented project planner.
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Ron Sardo
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Re: size
Reply #12 - Apr 19th, 2013 at 5:20pm
 
Ed Weber wrote on Apr 19th, 2013 at 5:13pm:
Not just beginners

I guess you are right  Smiley


Gary,
When you are drawing up your plans on graph paper it is a good idea to draw both the outside profile as well as the inside profile. Then draw your rings with their intended heights to get a visual feel of the board widths
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Re: size
Reply #13 - Apr 19th, 2013 at 11:18pm
 
Size is relative.  Too big and you are cutting up hill on a wide segment.  Too small and there are too many joints.  Sometimes the design of feature rings will make the choice for you.  I prefer 12 segment rings on up to 8-10" bowls.  16 segments for 10" and up.
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Larry Whitlow
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Re: size
Reply #14 - Apr 19th, 2013 at 11:29pm
 
Ron Sardo wrote on Apr 19th, 2013 at 10:23am:
Depends on the size and the curvature of the finish piece.

My online segment calculator will give you the dimensions you require


Ron, where do I find your segment calculator?
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