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Proportional Dividers - Golden Section and Generalized #5: Golden Divider Prototype

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Blog entry by Mark Whitsitt posted 12-02-2010 07:37 PM 3543 reads 0 times favorited 5 comments Add to Favorites Watch
« Part 4: Proportional Divider - 3-Arm Part 5 of Proportional Dividers - Golden Section and Generalized series no next part

Here’s the prototype of my golden divider, made with 1/8” tempered hardboard. It’ll do for now, but I have plans to make this from something a little nicer…

The longest legs on this one are 11 3/8” long, so it’s a little bigger than the ones I’ve seen posted elsewhere.

You can get my Sketchup Model on the 3D Warehouse by searching for “Jawhorse-Sawdust”

Mark

-- -- "there are many good reasons to use old hand tools, but moral superiority is NOT one of them..."



5 comments so far

View PurpLev's profile

PurpLev

8476 posts in 2305 days


#1 posted 12-02-2010 08:48 PM

very cool. still want to make one of those, but the thing is – I do all the design in SU where it’s just too easy to multiply/divide by 1.618…

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Mark Whitsitt's profile

Mark Whitsitt

86 posts in 1636 days


#2 posted 12-02-2010 09:37 PM

PurpLev,
I know… I “pre-build” just about everything I make in Sketchup first… sort of work out the construction process there…

but sometimes I like to improvise with a scrap or other piece of wood in the shop, and having a few design/layout tools out there helps a lot…

for instance, I’m planning to make a couple of boxes out of crown molding, and with the calipers, I can pretty much do it all in the shop without any math beyond addition or subtraction (for the box bottom grooves…)

M

-- -- "there are many good reasons to use old hand tools, but moral superiority is NOT one of them..."

View TopamaxSurvivor's profile

TopamaxSurvivor

14753 posts in 2333 days


#3 posted 12-03-2010 12:57 PM

Studie gave Todd and I the makin’s for those. They are hard to get exactly on the money ;-( I was thinking that making them proportinal just using an X design as in one of your previous blogs would be the best way to go.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Mark Whitsitt's profile

Mark Whitsitt

86 posts in 1636 days


#4 posted 12-03-2010 05:05 PM

TS,

You’re right about the precision issue and the simpler X design; reduce the complexity to reduce the error. But remember that Phi (the golden ratio) is an irrational number that keeps going and going (i.e. 1.61803399…), so you can’t ever get it exactly.

Besides, I’m only using this as a improvisational design tool, and I figure the mathematical error in the tool is all part of making a work piece uniquely mine! Once I figure a couple of rough dimensions with the divider, the rest is all rulers and stop blocks!

Mark

-- -- "there are many good reasons to use old hand tools, but moral superiority is NOT one of them..."

View mafe's profile

mafe

9547 posts in 1746 days


#5 posted 01-16-2011 02:18 PM

Cool, I will copy the locking mecahnism and put this on mine.
Best thoughts,
MaFe

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

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