Inverted World #3: Cutting Curves

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Blog entry by BritBoxmaker posted 07-09-2011 07:33 PM 2415 reads 3 times favorited 7 comments Add to Favorites Watch
« Part 2: Pattern Reduction and Tooling Up Part 3 of Inverted World series Part 4: All Together now »

So the tools are prepared, now the materials.

I would love to have used Bloodwood, not so easily available here, so its Padauk (I’ll watch it darken with age), Sycamore and a small piece of African Blackwood I had left from the Italian Restaurant box. To mark out the pieces I printed off the pattern and cut it up. The marking up of the Blackwood reminded me of when I was a small child, watching my mum marking out patterns for clothes (she was a seamstress).

I cut these pieces on the bandsaw and arranged them on the Padauk for a rough idea of what I’m aiming at.

For sticking the pieces to the router template I use double sided tape. Hold well enough and cleans off relatively easily afterwards.

The post on the main jig is only 15mm high. I want to route 20mm thick pieces so I taped two scraps of the sycamore (with suitably bored 6mm holes) onto the template.

To locate them properly over the pivot hole I inverted the template, put it over the pin and taped the spacer onto the underside.

I use a 6mm spiral cut bit for this kind of work. I tried a test piece, lining it up over the scratched pattern of the template, setting the bit distance from the pin to coincide with this line and taping it down.

Here’s the template on the jig, complete with spacers

I cut 2mm (height) at a time in order to give the tape a decent chance at holding and not to overload the router bit.
When I cut using a template like this I only cut up to about a veneer’s thickness away from the template face in order to save scratching it up. I remove the piece and trim the rest of with an X-acto knife.

The order of edges cut was as follows. All like pieces were cut at once and the order gives the minimum number of router bit distance re-settings in order to cut down on errors.

Half way through

Finally I have all four pieces fitting together and can rout the last two outside edges (5 in the cutting order diagram)

Right, apart from trimming up the straight edges the pattern is done

I’ve also book-matched the Padauk for the pattern surround. With the appropriated jaws my router table doubles up as a cramping jig for board glue-ups

Thats it for today. Beer time.

Be seeing you.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

7 comments so far

View Sodabowski's profile


2388 posts in 3198 days

#1 posted 07-09-2011 09:43 PM

Ingenuity at work. Enjoy the beer :)

-- Thomas - there are no problems, there are only solutions.

View Sheila Landry (scrollgirl)'s profile

Sheila Landry (scrollgirl)

9238 posts in 3285 days

#2 posted 07-09-2011 10:08 PM

Now I get it! It really is clever. Looking good, Martyn!

Enjoy your refreshments!


-- Designer/Artist/Teacher. Owner of Sheila Landry Designs ( Scroll saw, wood working and painting patterns and surfaces. "Knowledge is Power"

View LittlePaw's profile


1571 posts in 3443 days

#3 posted 07-09-2011 10:42 PM

That’s really interesting, Martyn. With the precision and care you put into it, no wonder the product look so amazingly beautiful! Next?

-- LittlePAW - The sweetest sound in my shop, next to Mozart, is what a hand plane makes slicing a ribbon.

View BertFlores58's profile


1698 posts in 3287 days

#4 posted 07-09-2011 10:48 PM

As usual, there are new episode where the trade secrets are revealed. I noticed how you quickly you glue up pieces (paduak) using that sliding jig as clamp… thanks for the idea. Same with the double pivot (radius center) to cut the concentric arcs.


-- Bert

View BertFlores58's profile


1698 posts in 3287 days

#5 posted 07-09-2011 10:52 PM

Oh… I knew why you are in the inverted world… Are you underneath the table while cutting it? LOL. You have the pattern and the wood on top while the bit is under it… this will avoid the tearouts… how ingenous.

-- Bert

View fernandoindia's profile


1081 posts in 3308 days

#6 posted 07-10-2011 12:37 AM

Enjoy you beer, I´m enjoying this blog now.

as to a box top or a wall art, I do like a box better. Besides, you already have a place in your Box Display Cabinet, don´t you?

Or as the walrus and the carpenter, eat them all!

But please, don´t you ever consider an end grain chopping board.

-- Back home. Fernando

View lanwater's profile


3111 posts in 3299 days

#7 posted 07-10-2011 08:21 AM

Thanks Martyn!

This is a fantastic blog series.

I have learnt many tricks from you through your many projects.
This blog tought me even more. I particularly like the cramping jig.

Enjoy the beer.

-- Abbas, Castro Valley, CA

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