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Arc cutting on a bandsaw

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Forum topic by footprints posted 08-13-2014 04:05 PM 472 views 0 times favorited 7 replies Add to Favorites Watch
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footprints

39 posts in 1760 days


08-13-2014 04:05 PM

Does anyone have a bandsaw jig that cuts arc shaped segments that are edge glued to form a round table top? The segments start at zero at the center and expands (becomes wider) as you move radially outward.

-- Ray, Phoenix, Maryland


7 replies so far

View Redoak49's profile

Redoak49

339 posts in 640 days


#1 posted 08-13-2014 04:11 PM

A lot depends on how large the segments are and how accurate you need to be.

I have problems in cutting arcs on the band saw that are really accurate and the cuts smooth. I have made some jigs to move the wood I am cutting in a circle but never been 100% satisfied. Basically, it is just a plywood section that has a center post and then arms to swing the piece.

I end up using a router jig to cut round segments. I have cut small ones and up to about 36” radius arcs with the router. It gives me a clean edge and accurate arc. I will usually use a spiral router bit to do the cutting.

View Yonak's profile (online now)

Yonak

274 posts in 173 days


#2 posted 08-14-2014 03:55 AM



Does anyone have a bandsaw jig that cuts arc shaped segments that are edge glued to form a round table top? The segments start at zero at the center and expands (becomes wider) as you move radially outward.

- footprints

Ray, when you say starts at the center and gets wider as you go outward, do you mean you want to cut pie-shaped pieces ? ..Or do you mean a spiral cut of some fashion ? If you don’t get a good answer can you post a sketch of what you mean ?

View Loren's profile

Loren

7545 posts in 2300 days


#3 posted 08-14-2014 05:46 AM

You can cut them out with a template… making the
template is the tricky part. For that matter, getting
curved edge joints to match up is tricky. You’ll
probably find it easier to do with veneer. I might
be concerned about a solid wood disc glued up
thus bursting from wood movement.

-- http://lawoodworking.com

View robscastle's profile

robscastle

1698 posts in 856 days


#4 posted 08-14-2014 06:02 AM

Ray,

You may want to ask degoose he is an expert on arcs.
Validated from some of his work I have seen!

-- Regards Robert

View cabmaker's profile

cabmaker

1311 posts in 1461 days


#5 posted 08-14-2014 01:56 PM

I make up my own as needed for elipticals which I think is what your after. Pretty simple mine only get a little slow when setting up for long major radius s for conferance table and the like

I cut my templates with a shop made router sled then use the templates to panel pilot the substrate and subsequently am able to panel pilot the finish top from there as well as any edgebandings

Incidentally the router sled attaches to the articulating arms of the eliptical jig set up which has been successfully and accurate for me up to major radius s of 20 ft. Or so
L
My articulating arms follow a dovetail way in plywood but I am in the process of creating one that will be easily adj and collapsible for storage with a sled that will accommodate a number of router bases

This may not be helping you any but I I have cut lots of ellipses via the bandsaw, jigsaw but only where extreme accuracy directly from the machine is not critical.

Enjoy the journey. ( study up a little on major and minor axis. Key ingredients)

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footprints

39 posts in 1760 days


#6 posted 08-14-2014 08:33 PM

Yonak, I am trying to cut spiral segments.
Robcscastle, thanks for the lead…..............and thanks to all of you for your feedback. I have my french curves and compass sets out to draw several ideas that may do the trick. Will let you know if it turns out.

-- Ray, Phoenix, Maryland

View pintodeluxe's profile

pintodeluxe

3356 posts in 1465 days


#7 posted 08-14-2014 08:46 PM

I would rough cut at the bandsaw, and save the finish cutting for a router and template.

Good luck with it.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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