Inverted World #2: Pattern Reduction and Tooling Up

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Blog entry by BritBoxmaker posted 07-08-2011 10:20 PM 4658 reads 4 times favorited 13 comments Add to Favorites Watch
« Part 1: Introduction Part 2 of Inverted World series Part 3: Cutting Curves »

Hello again. Lets start with a reminder of what the Inverted World pattern looks like

I don’t know if you can see from this but the pattern consists of only 3 (three) different types of piece

Labelled here as A, B and C. Both of the B’s in this picture are mirror images of each other.
To complete the pattern we need 4 x A ( 2 black, 2 white), 8 x B ( 4 black, 4 white) and 4 x C ( 2 black, 2 white).
You should also be able to make out from the first picture that if you divide the pattern in either direction diagonally that one half is simply a 180° rotated version of the other. To this end I will only be routing half the above number of parts, assembling them into a pattern and re-sawing the result to make the whole pattern.

Confused yet? Gooooood.

Now as I said I’m going to be using my Circle Routing Jig for the Router Table. Here’s the Jig

Just the perspex (plexiglass) thing with the metal post in it. Not the Hardboard (Masonite) sheet. Thats just there to make things clearer. My workbench is well used and abused.

Here’s my router table

and a detailed underside pic showing my ancient Hitachi M8 1/2” router and the car sissor jack I use as a height adjuster (from a Mini, as in the original film, The Italian Job).

The above pic showing the pattern pieces is the basis for the drawing of the template I will use, in conjunction with the Circle Routing Jig, to cut the pieces. So

This is transferred onto a 6mm piece of perspex with a knife and dividers, so

This shows the Jig mounted on the table (with two M8 threaded locking knobs) and the template located on the metal pin

Basically what you do is attach a blank of your chosen wood, slightly larger than the size and shape you want to route it too, to the underside of the template with double sided tape and rotate the template past the router bit. Here is a picture of me sizing up some Ebony in preparation for this

I’m obviously going to trim it down a bit on the bandsaw before I start routing. That stuff is expensive.

To those of you unfamiliar with this type of routing technique this may sound like nonsense at this point. Suffice it to say that all will become clear as soon as I start routing the pieces. Thats for part 3. though. Its Friday night. I need a beer or three, so thats all for now.

Be seeing you

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

13 comments so far

View KnotCurser's profile


2031 posts in 3429 days

#1 posted 07-08-2011 10:23 PM

You know – I really think you enjoy the trip more than the destination my friend. :-)

Looking forward to the rest of the journey.


-- Robert Rhoades WoodWorks / Email: [email protected] /

View BritBoxmaker's profile


4611 posts in 3397 days

#2 posted 07-08-2011 10:27 PM

You could be right, Bob.

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

View Sodabowski's profile


2388 posts in 3193 days

#3 posted 07-08-2011 10:29 PM

Actually it’s all very clear to me.

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

View BritBoxmaker's profile


4611 posts in 3397 days

#4 posted 07-08-2011 10:30 PM

Good Thomas, you can help the slower ones then. Lol.

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

View majeagle1's profile


1426 posts in 3857 days

#5 posted 07-08-2011 10:43 PM

Clear as a bell Martyn….. hey, that jack looks like the one I had in my ‘59 “bugeye”......... I was wondering where it went!

-- Gene, Majestic Eagle Woodworks,,

View Bertha's profile


13567 posts in 3054 days

#6 posted 07-08-2011 10:47 PM

I always expect the guys that put out the most technical work to have shops brimming with top of the line, high tolerance machines. Just goes to show, doesn’t it? The best boxmaker around has a vintage Hitachi propped up on a car jack. I’m thinking that I probably don’t deserve my tools right now.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View SPalm's profile


5332 posts in 4242 days

#7 posted 07-08-2011 10:52 PM

Hey Martyn, it’s fun to watch you think.
And I enjoy the trip too.


-- -- I'm no rocket surgeon

View BritBoxmaker's profile


4611 posts in 3397 days

#8 posted 07-08-2011 11:44 PM

Al, I would love to have the latest and greatest but I cant help thinking of an old Stones lyric

You can’t always get what you want
No you can’t always get what you want
But if you try sometimes
You just might find
You get what you need

I just try to get more out of the tools I have. That justifies things for me.

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

View sras's profile


5061 posts in 3490 days

#9 posted 07-09-2011 01:33 AM

Another fun journey Martyn! I’m enjoying every step.

-- Steve - Impatience is Expensive

View Druid's profile


2055 posts in 3156 days

#10 posted 07-09-2011 05:28 AM

Another interesting project that I’m eagerly watching. Thanks in advance for the demo Martyn.

-- John, British Columbia, Canada

View Sheila Landry (scrollgirl)'s profile

Sheila Landry (scrollgirl)

9238 posts in 3280 days

#11 posted 07-09-2011 02:15 PM

I think I get it. I get the pattern part and the pieces needed. I am still a little fuzzy on the jig though. I understand the concept of the jig, but just need some clarity on the implementation. I am sure that will come with the next step and I will have an ‘ahhhhh’ moment. :)

Watching. Waiting. Fascinated.

Thanks, Martyn!


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

View BarbS's profile


2434 posts in 4446 days

#12 posted 07-09-2011 03:21 PM

Your text is explaining your jig excellently, Martyn. I think you are on your way to a book, and this is good practice.


View LittlePaw's profile


1571 posts in 3439 days

#13 posted 07-09-2011 05:31 PM

As a life long sailor, I’ve always enjoyed the journey more than the arrival. I’m holding my breath for the next step, Martyn.

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

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