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General Category => Pattern Requests. => Topic started by: mikesp on April 24, 2016, 06:21:16 am

Title: Concentric ring bowl plan
Post by: mikesp on April 24, 2016, 06:21:16 am

Hi. The concentric ring bowl plan seems to be gone from the scrollsaw workshop site. I didn't save it last time I downloaded it. Does anyone have a download they could forward me please. Cheers Mike

Title: Re: Concentric ring bowl plan
Post by: don in brooklin on on April 24, 2016, 10:02:10 am

Attached is a pattern of a 7 inch round bowl with 3/8 inch rings.

I use polydraw at http://www.scrollmania.com/

If you need other shapes it is fairly easy to follow the instructions to make other patterns.

Dave Van Ess the author of the site is very good at helping too.

If that is not what you want I may have the pattern as I save a lot.

Title: Re: Concentric ring bowl plan
Post by: barb e on April 26, 2016, 08:40:34 am

I have the pattern as a pdf but can't seem to attach it - to large!  Can someone instruct me on how to send it please!!

Barb

Title: Re: Concentric ring bowl plan
Post by: EIEIO on July 23, 2016, 09:17:42 am

If you have a compass and can find the center of the board, you can draw this directly on the wood rather than glue on a pattern. To calculate the cutting angle, use this equation:
    angle = arctan(ring thickness/board thickness)
in this case,
    angle = arctan(.375/.750) = arctan(0.50) = 26.6 degrees
If you don't have a calculator to make that arctan calc, try this one: http://web2.0calc.com/ (http://web2.0calc.com/). If you click on "2nd" you'll see along the left edge the word "tan" change to "atan" (same as arctan).

Remember you need to drill the starting holes at that angle as well.