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

Blog entry by patron posted 47 days ago 488 reads 6 times favorited 24 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 ,new mexico ,allheart


24 comments so far

View EzJack's profile

EzJack

175 posts in 63 days


posted 47 days ago

Yeah but your free.

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

View degoose's profile

degoose

1981 posts in 247 days


posted 47 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 once, cut twice. New website up.... lazylarrywoodworks.com.au

View BarryW's profile

BarryW

872 posts in 799 days


posted 46 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

4827 posts in 254 days


posted 46 days ago

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

-- I will just keep doing it till I get it right.

View stefang's profile

stefang

1644 posts in 227 days


posted 46 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, American in Norway

View littlecope's profile

littlecope

581 posts in 395 days


posted 46 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 Manchester, NH---Unpleasant tasks are simply worthy challenges to improve skills.

View hootr's profile

hootr

131 posts in 239 days


posted 46 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

315 posts in 188 days


posted 46 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

-- I inherited the woodworking gene and it's gone into overdrive.......

View Scott Bryan's profile

Scott Bryan

20575 posts in 715 days


posted 46 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.

-- With God's help all things are possible- even woodworking. Woodworking is not just a hobby, it is an (expletive deleted) expensive hobby.

View patron's profile

patron

2376 posts in 234 days


posted 46 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 ,new mexico ,allheart

View Karson's profile

Karson

25797 posts in 1293 days


posted 46 days ago

David: A very useful and inexpensive vacuum bag.

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

-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †

View Kent Shepherd's profile

Kent Shepherd

805 posts in 179 days


posted 46 days ago

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

Thanks David

-- Kent Shepherd * The goal is-----More Tools!

View depictureboy's profile

depictureboy

305 posts in 535 days


posted 46 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

246 posts in 115 days


posted 46 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 - What's your excuse this time??

View PetVet's profile

PetVet

233 posts in 380 days


posted 46 days ago

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

-- Rich in Richmond

View patron's profile

patron

2376 posts in 234 days


posted 46 days ago

karson – thanks for the thumbs up , it’s good to see im getting thru to the youngsters here !
kent – thats debatable ,i did read 2 of stephen hawkings books , and will say that i agree with only half of his thoughts , the questions !
i can’t make heads or tails out of his answers .
pictureboy – not having much experience in veneering , i wonder if the bubble wrap might leave mini-craters in the work ? i would try it out on some scraps first with and without the bubble wrap first . i ran my vacuum for about 2 hours , and it didn’t get hot . so i let it go on till the glue turned to honey and held on it’s own , i was going to make a check valve for the pickup , but the nozzle was a tight fit and i mixed my first batch of glue to strong , and had to hump to get things aligned quickly , so i didn’t get to it . i was going to cut a innertube rubber and just spot glue it once to the adapter top , thinking i could unhook the vacuum and the flap would seal the bag . i still think it would work , just have to wait for next time .
wanut – probably because it’s better to be safe , than sorry ?
if one turn is good , then 20 is probably better ( huh ) !
must come from all the fear stuff we are taught !

-- david ,new mexico ,allheart

View Walnut_Weasel's profile

Walnut_Weasel

246 posts in 115 days


posted 46 days ago

By the way Patron – Beautiful work!!

-- James - What's your excuse this time??

View EzJack's profile

EzJack

175 posts in 63 days


posted 46 days ago

I can tell you were humping BIG TIME. I bet the sweat was flying.
Are there are reasons for concern for the last quarter or is the glue ooze within the tolerance?
When I do mine
I wanta know if it’s fine

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

View EzJack's profile

EzJack

175 posts in 63 days


posted 46 days ago

Don’t get me wrong I wouldn’t steal your idea, I would just use it when I steel dustbunny’s.

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

View patron's profile

patron

2376 posts in 234 days


posted 46 days ago

have away !
because of the backstops ,
the last quarter is also trapped .

i will rout the top to round to the point tips ,
the but ends don’t matter ,
as there is plenty there ,
and leave a tongue from the top as a fin for the border dadoes to fit to.
just use slow glue , as it takes some finessing ,
and you want a fine notched spreader ,
so the glue doesn’t ” float ” the pieces .

-- david ,new mexico ,allheart

View EzJack's profile

EzJack

175 posts in 63 days


posted 46 days ago

Thanks, truly kick azz

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

View EzJack's profile

EzJack

175 posts in 63 days


posted 46 days ago

The glue looks a lot easier to knock down than when I wax paper, flat board, and add weight.

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

View patron's profile

patron

2376 posts in 234 days


posted 46 days ago

im sanding right now , that epoxy is HARD man !

might be easier to do what i did with the first one ,
i had apiece of ply big enough to cover the whole thing ,
and then the vacuumit , the glue didn’t seep through ,
so i didn’t have to sand so much ,
but it was pine and alder so was easy to do .
this is HARD wood , so it’s bound to be harder ,
if i had time and money ,
i would take it to a 52” wide belt sander and let them do it ,
then just finish it .

-- david ,new mexico ,allheart

View depictureboy's profile

depictureboy

305 posts in 535 days


posted 46 days ago

you are probably right about the bubble wrap…but I bet I could still do it with a mdf top with lines cut in to let the air around…hmmm…...

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

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