How do you figure this??? - Router Forums
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post #1 of 22 (permalink) Old 04-03-2018, 09:15 PM Thread Starter
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Default How do you figure this???

Following along Gary's (roofner) idea I gotta build the MIL a wishing well. Now....... for an octagonal (8 sided) shape using 2 x 4's -- ---- how long should each piece be to make the octagon wheels approx 4' in diameter? This is like horse shoes and hand grenades -- close will work.

There's got to be a formula for this I would think. Or I just go back to the trial and error method. I'd also like to be able to have minimal waste left from the cedar boards -- and what length they should be ie 6 or 8'.

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post #2 of 22 (permalink) Old 04-03-2018, 09:59 PM
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I can probably work the math if I think about it for a minute but while I'm thinking about it I can draw it in CorelDraw and give you the measurement - 20", 19.88" to be exact, but I would make them about 20 1/2' to allow for a tiny bit of leeway in cutting your circle.

How do you figure this???-48-inch-wheel-octagon-segments.jpg

David

Edit - just read your post again and it looks like you want to keep the octagon shape, not round. In that case then 20" would work.
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Last edited by difalkner; 04-03-2018 at 10:01 PM. Reason: clarification
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post #3 of 22 (permalink) Old 04-03-2018, 10:51 PM
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John,

When I was making my turtle planters, I found the best way to get good tights joints in the octagonal body was to make a jig for my miter saw so that all like parts had the identical length. I needed different widths and three different lengths, but the basic jig would be the same. I made a base that bolted to the saw table with a stop at one end so it would be repeatable and then three different stops that were located by dowels to assure repeatability. For a one of project - I've made 8 of these planters to date, and contemplating another run of three - you would just need a simple table with one fixed stop.

How do you figure this???-img_3967.jpg

Showing the original (clamped) stop block and the three different lengths of segments required - although each layer is a different width, the inside dimensions are the same so that the cavity where the flower pot goes is the same dimension top to bottom.

How do you figure this???-img_4237.jpg

Showing one of the removable stops (located by dowels) in place & making the initial cut on the end of the board. Not shown in the photo, but there is a stop underneath the plywood table on the right that locates against the end of the saw table so that the fixture always locates to the same saw kerf.

How do you figure this???-img_4238.jpg

Showing the wood flipped front to back and the cut end placed against the stop, ready to cut to length. To make multiple parts, continue to do this until the board becomes too short. Repeat until you have the required number of pieces. I was starting with 8' lengths, so there is an outboard support for the boards to the right of the saw.

How do you figure this???-img_4292.jpg

Showing an assembled body, with the five layers glued and screwed together - the body is actually an oval hexagon - the consistent lengths of the parts went a long way to giving me nice tight joints, really struggled with the project until I took the time out to make the fixture. Now, if I damage one of the segments, I can easily set up the fixture and make just one piece that's identical to those made previously.

Good luck.
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post #4 of 22 (permalink) Old 04-03-2018, 10:53 PM
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Yeah, I'd wind up with a design like David's. Except I'd just make a circle on 1/4" graph paper, and go from there.

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post #5 of 22 (permalink) Old 04-03-2018, 11:21 PM
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My wheels the long side is 9 inches but width is 3 inches. I would have to measure the short short side of the 3 inch. Then cut the 5 inch block with the short is the same length as 3 inch what ever that new long side is and make all 8 pieces are same length. Think of the segments the 3 wide stock short side are the same on 5 wide you line up it would just be 2 inches wider.
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Last edited by roofner; 04-03-2018 at 11:35 PM.
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post #6 of 22 (permalink) Old 04-04-2018, 02:29 AM
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Google inscribed octagon. There should be a bunch of formulas that we had to use when hand drawing these things back in the dark ages.
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post #7 of 22 (permalink) Old 04-04-2018, 06:34 AM
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Quote:
Originally Posted by honesttjohn View Post
Following along Gary's (roofner) idea I gotta build the MIL a wishing well. Now....... for an octagonal (8 sided) shape using 2 x 4's -- ---- how long should each piece be to make the octagon wheels approx 4' in diameter? This is like horse shoes and hand grenades -- close will work.

There's got to be a formula for this I would think. Or I just go back to the trial and error method. I'd also like to be able to have minimal waste left from the cedar boards -- and what length they should be ie 6 or 8'.
John, where were you during math class? Maybe flirting with the pretty girls.

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #8 of 22 (permalink) Old 04-04-2018, 06:40 AM Thread Starter
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John, where were you during math class? Maybe flirting with the pretty girls.
Don,

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post #9 of 22 (permalink) Old 04-04-2018, 06:48 AM
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Most wishing wells use the offset rings not like here you don't want a cone.
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post #10 of 22 (permalink) Old 04-04-2018, 06:55 AM Thread Starter
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Most wishing wells use the offset rings not like here you don't want a cone.
Right. I got the general idea on what I want to do now. Doing it is another thing.

How do you secure the side posts to keep them upright outside?

HJ

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