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8 posts • Page 1 of 1

Ring Master Cutting Angles

#9209 by paulmcohen » Sun Jan 06, 2008 1:22 am

The instructions that come with the Ring Master have a very complicated way to calculate the cutting angle when they could have just included a table.

I used Excel to calculate these so it anyone wants the template just send me private mail. There is a 1/2 degree discrepancy from the manual at 3/8" that I can't explain.

Wood
Thickness - Angle
3/8 - 40.0
7/16 - 35.5
1/2 - 32.0
9/16 - 29.0
5/8 - 26.5
11/16 - 24.5
3/4 - 22.5
13/16 - 21.0
7/8 - 19.5

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Paul Cohen
Beaverton, OR
A 1982 500 Shopsmith brand upgraded to a Mark 7 PowerPro, Jointer, Bandsaw (with Kreg fence), Strip Sander, Ring Master and lots of accessories all purchased new
12" Sliding Compound Mitre Saw, 1200 CFM DC

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#9225 by charlese » Sun Jan 06, 2008 1:50 pm

Paul, Excellent Point. Sometimes inventors/engineers/manufacturers ignore the more practical applications of their products such as considering - "What would I want if I were to purchase, then try to use the product."

Could the 1/2 degree difference be due to rounding error? Maybe only trial and error will tell!

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Octogenarian's have an earned right to be a curmudgeon.
Chuck in Lancaster, CA

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#9234 by Nick » Sun Jan 06, 2008 3:52 pm

To be as kind as possible to the mindless hack who pasted together Ringmaster’s dismal excuse for an Owner’s Manual, it really does suck dead toads. The business that you have pointed out concerning angles is just one of the many, many boats this clueless cretin missed.

Not so with the tool. Drew and I have been exploring the Ringmaster for these last few weeks, getting ready for the January 12 Sawdust Session, and we’ve found that it is delightfully versatile and capable. I fully expected to find that it was a moderately useful gizmo the capacity of which could be demonstrated in 15 to 20 minutes. Not so. Drew and I are now considering that it will take 3 or 4 sessions just to explain the major uses of the Ringmaster, and we can already see possibilities for more.

Those two things being established – the tool is great; the manual is horse puckey – let me say one more thing. There is no reason in the world why the user should be restricted to using a single angle for a given thickness of stock. In fact, if you reject this premise, begin exploring what you can do with a range of angles, and navigate this new territory using a little trigonometry, the possibilities begin to multiply quickly.

This coming weekend, I’m going to address how to create bowls with straight sides from a single piece of wood. Select the thickness of your stock (up to 1”) and the slope of the bowl wall (up to 45 degrees), then calculate the “ring spacing” needed to achieve it. You can also figure the wall thickness, if you want. The illustration below hints at the process. If you plane your stock to 3/4” thick and want to create a bowl with walls sloped at 30 degrees (not the suggested 22-1/2 degrees), cut rings every 7/16”. (3/4 x tan30 = 7/16) They will match up perfectly.

[ATTACH]775[/ATTACH]

By the way, Drew and I have also developed an Excel calculator for the mathematically challenged who would rather not deal with sines, cosines, and tangents. Think of it as a GPS for exploring Ringmasterland.

With all good wishes,

Attachments

Stacking_Ringss.jpg
Stacking_Ringss.jpg (28.13 KiB) Viewed 14201 times

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#9245 by paulmcohen » Sun Jan 06, 2008 8:05 pm

I just found that the Shopsmith version of the Ring Master came with a CD with a new manual. I almost threw out the box without noticing it. The CD has a lot of information but not a simple and clear as what Nick posted. There is also a commercial application called ProtoShaper I am not sure how it is different than the Excel sheets Nick has created.

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Paul Cohen

Beaverton, OR

A 1982 500 Shopsmith brand upgraded to a Mark 7 PowerPro, Jointer, Bandsaw (with Kreg fence), Strip Sander, Ring Master and lots of accessories all purchased new

12" Sliding Compound Mitre Saw, 1200 CFM DC

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Re: Ring Master Cutting Angles

#257481 by twobachs » Wed Feb 27, 2019 6:22 pm

I have a used ringmaster and I sure could use your excel program. How can I get a copy?

Jim

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Re: Ring Master Cutting Angles

#257495 by rpd » Wed Feb 27, 2019 11:03 pm

twobachs wrote:I have a used ringmaster and I sure could use your excel program. How can I get a copy?

Jim

. .
Welcome aboard, but I suspect you won't get an answer, This thread is 11 years old. Also, I just checked Paul's profile and it has been almost two years since he was last active on this forum.

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Ron Dyck
==================================================================
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,

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Re: Ring Master Cutting Angles

#257541 by bach939 » Thu Feb 28, 2019 5:31 pm

Bummer. Thanks for getting back to me.

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Re: Ring Master Cutting Angles

#257546 by rpd » Thu Feb 28, 2019 7:43 pm

bach939 wrote:Bummer. Thanks for getting back to me.


I should have read the thread a bit more. :o

The spreadsheet was actually mentioned by Nick.

It is part of Sawdust Session 14. The link is below. you have to scroll down the window on the right to get to the spreadsheet.

http://www.shopsmithacademy.com/SS_Archives/SS114/SS114_Segmented_Bowls.htm

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Ron Dyck
==================================================================
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,

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