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Author Topic: How to route multiple curves in a large sheet  (Read 2474 times)

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Offline Acrobat

  • Posts: 471
How to route multiple curves in a large sheet
« on: June 04, 2021, 05:48 AM »
Hi, a while ago the local council were tossing these large seats away as the wood was rotten and the seats were in disrepair having been in a local park for years. I replaced the timber with ply and routed the gaps to follow the seat frame curves by hand as best I could. I am hoping the brains trust here can point me in the direction of a router jig with a bearing and extendable rod so I can adjust the curve as required.
Here’s a sketch of what I am doing and thinking of regarding a jig.
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Offline Acrobat

  • Posts: 471
Re: How to route multiple curves in a large sheet
« Reply #1 on: June 04, 2021, 06:59 AM »
Here is one I have done by hand so am hoping a guide jig of some sort will help and speed up the process as I have 3 or 4 more to do.
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Offline squall_line

  • Posts: 2267
Re: How to route multiple curves in a large sheet
« Reply #2 on: June 04, 2021, 07:44 AM »
The length of rod and size of table you need to make it work in a sweeping radius may be pretty large; I can't tell quite how big the radius is.

Technically you just posted your jig in your reply post, right?  [wink]

Using the new piece as a template to make a routing jig out of MDF may be a good way to go, if you're happy with the first piece and still have access to use it for such purposes.
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Offline ChuckS

  • Posts: 4848
Re: How to route multiple curves in a large sheet
« Reply #3 on: June 04, 2021, 09:07 AM »
I'd try the template (made of 1/8" or max. 1/4" thick material) & guide bushing approach.

« Last Edit: June 04, 2021, 09:10 AM by ChuckM »
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Offline Michael Kellough

  • Posts: 6375
Re: How to route multiple curves in a large sheet
« Reply #4 on: June 04, 2021, 01:54 PM »

Looks like the bench in the photo is about twice as long as the drawn bench...

The safest way to do this is with a very long trammel arm. This will keep you from over cutting and undercutting. The next best way is with a rig sorta like you drew but with two bearings and two rods. I have a picture but...The bearings should be as big and tall as practical. Wax the bottom of the rig.



« Last Edit: June 04, 2021, 02:01 PM by Michael Kellough »
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Offline Crazyraceguy

  • Posts: 3302
Re: How to route multiple curves in a large sheet
« Reply #5 on: June 04, 2021, 06:55 PM »
As Michael pointed out, a trammel is the best way to do this, the first time. But what I would do is make an over-sized template/pattern to cut your actual parts with a guide bushing. This takes much of the fussy aligning out of the mix. You do the layout once, then you can make as many of the as you want/need.
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Offline rst

  • Posts: 3048
Re: How to route multiple curves in a large sheet
« Reply #6 on: June 05, 2021, 09:00 AM »
Not really relevant but you could make that curve template with the Shaper quite easily although expensive solution unless you own the Shaper.  Being the the crazy that I am I bought into the Shaper pre-production so now own a tool worth 25% more than I paid.
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Offline Gregor

  • Posts: 1778
Re: How to route multiple curves in a large sheet
« Reply #7 on: June 05, 2021, 05:45 PM »
Make a template, then use a copy ring / bit with bearing.

I would create the template by bending a flexible strip of wood along the curvature I desire, fix it to the template sheet and route along with a copy setup.

Basically like this:

just fixing it with to the sheet, then skipping the pencil.

Or pull out the Shaper Origin.
« Last Edit: June 06, 2021, 08:58 PM by Gregor »
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Offline Crazyraceguy

  • Posts: 3302
Re: How to route multiple curves in a large sheet
« Reply #8 on: June 05, 2021, 07:10 PM »
Quote from: rst on June 05, 2021, 09:00 AM
Not really relevant but you could make that curve template with the Shaper quite easily although expensive solution unless you own the Shaper.  Being the the crazy that I am I bought into the Shaper pre-production so now own a tool worth 25% more than I paid.

I was trying to keep in in the realm of normal/attainable, (even for a FOGer)..lol
If I actually needed to do this, it would be on a CNC.

Even with access to 5 x 12 CNC machines, I still see the usefulness/advantage of the Origin. One day, I will get around to getting one, especially after seeing so many creative ideas/uses on Youtube videos.
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DF500 + assortment set
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OF1010F
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MFK700 (2)
TS55,FS800, FS1080, FS1400/ LR32, FS1900, FS 2424/ LR32, FS3000
CT26E + Workshop cleaning set, Bluetooth remote
CT15
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ETS EC 125
RAS115
ETS 125 (2)
RTS 400
TS75
Shaper Origin/Workstation/Plate
MFT clamps set
Installers set
Centrotech organizer set
Socket/Ratchet set
Pliers set
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