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

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Blog entry by Mark Whitsitt posted 1358 days ago 3489 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 2274 days


#1 posted 1358 days ago

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 1605 days


#2 posted 1358 days ago

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

14721 posts in 2301 days


#3 posted 1357 days ago

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 1605 days


#4 posted 1357 days ago

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

9483 posts in 1715 days


#5 posted 1313 days ago

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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