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rosewood / curly maple /purpleheart / lacewood #3: operating in a vacuum !

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Blog entry by patron posted 1751 days ago 3047 reads 15 times favorited 44 comments Add to Favorites Watch
« Part 2: heres the tutorial for the starburst . Part 3 of rosewood / curly maple /purpleheart / lacewood series Part 4: well , i got this far . »

now i am glueing down the inlay , using west epoxy .
the problem being that i don’t like puting things ,
( like bricks , paint cans , bucket s of sand or water ) ,
and i dont have enough wood to make cauls .
so back to an old trick i learned in the fiberglass boating world .

as i think in a vacuum , it’s only natural to work in one too ?

so here it is .
.

.
a vacuum is not pressure , it is the absence of pressure .
when they went into space , it wasn’t like going down
deep in the ocean , where the weight of the water gets heavier
the deeper you go .
if you go out in space , a vacuum ( space ) ,does not get any more empty ,
than it already is . so if you want to travel in space ,
you only need to bring the pressure you want to operate comfortably .
the fuel and oxygen tanks and such , only need to be strong enough to hold the stuff together ,
not keep out the vacuum , as it just isn’t , zero pressure !
if you go outside without your ’ pressure ’ suit , the internal pressure in your body will rip you apart ,
because our body’s are not built to keep things in , but to keep things out .
air doesn’t weigh much , but gravity has more pull on it than the vacuum of space , which has no pull .
so to gluing my inlaid table down , i used a vacuum to let the air pressure in my house to force the inlay down ,
by covering it with bubble wrap the space between the bubbles lets the trapped air escape thru the vacuum cleaner ,
a cheap shop vac , thereby letting the air pressure force and hold the parts in place .
as i don’t have the money for an expensive vacuum forming bag , i had to improvise .
the shop vac is a far cry from a dedicated vacuum for this , as it sucks some air , but is not air tight .
but i’ll take what i can get .
air pressure at sea level is 14,5 lbs per square inch . so this helps quit a bit ,
and it is distributed evenly everywhere on the inlay !
.i start by laying out some stops at 90 degrees in the center ,
and sreading my epoxy with a notched trowel ,
in that quadrant , and placing the pieces in their place .
to keep them from sliding around , i put a strip a the edge and push them until they are even and tight ,
then tack it down with mi brad shooter .
the stick is mi radius , it lets me know when the back stops are even .
.

.
now i just mix enough glue for a quadrant at a time ,
and do the same for all of them .
.

.
here is my vacuum pickup adaptor , there is a dado in the bottom of it to let the air come to it , and not just snap tight to the wood beneath .
.

.

.
here is the pickup in place , with the bubble wrap ( smooth up ) .
.

.
here we are with the sheet of 4 mil plastic over everything and the pickup coming thru a slice in it ,
and the edges taped to the table board , to seal it off .
.

.
and here with the shopvac hooked up and running ,
notice the plastic is clearer than the last picture ,
because it sucked to the surface .
.

.
i let it run until the glue start to turn to honey , and has its own holding power .
then i will leave it to cure for a day before working on it again
total time to here ,15 hours over 3 days .
and my mind is still as empty as ever !

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle



44 comments so far

View EzJack's profile

EzJack

441 posts in 1768 days


#1 posted 1751 days ago

Yeah but your free.

-- Ain't better or worse than any other woodpecker in the woods.

View degoose's profile

degoose

6970 posts in 1952 days


#2 posted 1751 days ago

I was only discussing the use of a shop vac as a vacuum pump press for veneering just this week. It was with Pommy on Skype.. He wanted to use the wifes storage bags.. lol. So don’t anyone tell her.

-- Drink twice... and don't bother to cut... @ lazylarrywoodworks.com.au For lovers of all things timber...

View BarryW's profile

BarryW

1015 posts in 2504 days


#3 posted 1751 days ago

using the bubble wrap is genius…excellent idea.

-- /\/\/\ BarryW /\/\/\ Stay so busy you don't have time to die.

View Splinterman's profile

Splinterman

23058 posts in 1959 days


#4 posted 1751 days ago

Hey David,
Clever idea and cheap…....well done.

View stefang's profile

stefang

12565 posts in 1932 days


#5 posted 1751 days ago

Brilliant! I wonder if this would work on pizza dough. You never cease to amaze me David with your know how and ingenuity. I guess that’s what comes from having to actually earn a living doing woodworking, something I could never do.

-- Mike, an American living in Norway.

View littlecope's profile

littlecope

2882 posts in 2099 days


#6 posted 1751 days ago

Jeez, David… A highly skilled Craftsman, a Philosopher, a Poet, an Artist, an Adviser, and now a Space Scientist and Engineer…If you are thinking in a vacuum, most of the rest of us are trying to slog through mud!
Great Thinking… Again!

-- Mike in Concord, NH---Unpleasant tasks are simply worthy challenges to improve skills.

View hootr's profile

hootr

183 posts in 1944 days


#7 posted 1751 days ago

this just keeps getting better David
i’m gonna try this sunburst but on a trivet or something small first
what is your substrate and type of epoxy? it would have to be slow setting i assume

-- Ron, Missouri

View dustbunny's profile

dustbunny

1149 posts in 1893 days


#8 posted 1751 days ago

Aaahhh, David,
Surgery is a lot like woodworking.
We have this same system at the hospital for wound care.
It is basically identical except the bubble wrap is engineered foam, and the wood is wound tissue void of skin.
It’s called a wound vac. You could have been a millionaire if only you incorporated this to medical field.

Another excellent tutorial, I tucked it into my favorites.

Lisa

-- Imagination rules the world. ~ Napoleon Bonaparte ~ http://quiltedwood.com

View Scott Bryan's profile

Scott Bryan

27251 posts in 2419 days


#9 posted 1751 days ago

David, that is a pretty good system that you have worked out for the vacuum press. It looks like it works pretty well.

Very ingenious.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View patron's profile

patron

12955 posts in 1938 days


#10 posted 1751 days ago

heres the results , the epoxy is above the surface of the inlay ,
it cane up through the joints .
this tells me that the inlay is down flat and even .and not all hill and dale lumpy ,
so sanding will be even .

and as much as i want to start now ,
i think that i will split firewood today ,
i just found my hair dryer !
stay tuned …............

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Karson's profile

Karson

34853 posts in 2998 days


#11 posted 1751 days ago

David: A very useful and inexpensive vacuum bag.

Some great engineering went into the design. Nice job there.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View Kent Shepherd's profile

Kent Shepherd

2697 posts in 1884 days


#12 posted 1751 days ago

Are you a genius or what! It is amazing what we can learn on this site

Thanks David

-- She thought I hung the moon--now she just thinks I did it wrong

View depictureboy's profile

depictureboy

420 posts in 2240 days


#13 posted 1751 days ago

do you think something like this would work with as a regular veneer press? How much strain does it put on the vacuum? Would I want to use my good shop vac to do this or maybe get a cheap 5 gallon for this? So many questions…...

-- If you can't build it, code it. If you can't code it, build it. But always ALWAYS take a picture.

View Walnut_Weasel's profile

Walnut_Weasel

360 posts in 1820 days


#14 posted 1751 days ago

Nice work. I have always wondered why vacuum bag systems cost so much money…it has always seemed to me that you should be able to produce nearly the same results for much less money.

This brings another question to mind. (Newbie – please forgive me) If vacuum bags creating less than 20 psi is sufficient to create a good glue bond, why does everyone torque their clamps down so tight?? They have to be creating hundreds of pounds per square inch.

-- James - www.walnutweasel.wordpress.com

View PetVet's profile

PetVet

329 posts in 2085 days


#15 posted 1751 days ago

Pure genius, or very poor, or both! :) Now where are my wife’s storage bags…

-- Rich in Richmond -- Experience is something you don't get until just after you need it.

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