Wooden instrument cases designed to absorb moisture & prevent rust
 

Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used. The idea
is that the case will absorb moisture from the tool and thereby keep
it from rusting. Usually, these boxes are finished with a varnish on
the outside, and less often, on the inside. When the inside is not
varnished, it is usually left bare. I'm reasonably sure the original
finish is a varnish, because I've tested for shellac with denatured
alcohol, and these boxes generally predate polyurethane.

When I buy a used instrument the box is often in rough condition, and
I like to put them back in good shape by regluing, sanding, etc. I've
been leaving the inside sanded but unfinished (no coating of any kind)
and spraying polyurethane on the outside.

1) to maximize the water absorbtion, should the inside of the boxes
be left unfinished?
2) to maximize the water absorbtion, should the outside of the boxes
be left unfinished?
3) Is clear gloss sprayed polyurethane a good choice for finishing,
given that the water absorbtion issue is much more important than
protecting the finish of the box?
4) For making a new box from scratch, what wood choice would maximize
the water absorbtion?
5) I've seen some pretty old tools with ground cast iron faces arrive
inside intact boxes without rust, so I'm kind of tempted to believe
the whole water absorbtion idea. If anyone can substantiate this
theory, or offer an alternative hypothesis, I'd be very grateful.

I've cross-posted to our brethern over in rec.woodworking since they
have specialized knowledge of woods, as well as a shared deeply-held
hatred of rust on tools!

Thanks very much!
Dave

Wooden instrument cases designed to absorb moisture & prevent rust
 

I'm not too sure about the moisture absorbing qualities of wood but I think
the main reasons wood was used to package precision tools in the olden times
is that it was very much available cheaply and is a softer material that
won't mar the tools, rather than for its moisture absorbing qualities. Wood
is still being employed today for its traditional and aesthetic appearance
but plastics are also becoming very common.

"LowEnergyParticle" wrote in message
ups.com...
| Measuring tools and instruments often come in wooden cases. I've seen
| mahogany, birch, poplar, pine, and several other woods used. The idea
| is that the case will absorb moisture from the tool and thereby keep
| it from rusting. Usually, these boxes are finished with a varnish on
| the outside, and less often, on the inside. When the inside is not
| varnished, it is usually left bare. I'm reasonably sure the original
| finish is a varnish, because I've tested for shellac with denatured
| alcohol, and these boxes generally predate polyurethane.
|
| When I buy a used instrument the box is often in rough condition, and
| I like to put them back in good shape by regluing, sanding, etc. I've
| been leaving the inside sanded but unfinished (no coating of any kind)
| and spraying polyurethane on the outside.
|
| 1) to maximize the water absorbtion, should the inside of the boxes
| be left unfinished?
| 2) to maximize the water absorbtion, should the outside of the boxes
| be left unfinished?
| 3) Is clear gloss sprayed polyurethane a good choice for finishing,
| given that the water absorbtion issue is much more important than
| protecting the finish of the box?
| 4) For making a new box from scratch, what wood choice would maximize
| the water absorbtion?
| 5) I've seen some pretty old tools with ground cast iron faces arrive
| inside intact boxes without rust, so I'm kind of tempted to believe
| the whole water absorbtion idea. If anyone can substantiate this
| theory, or offer an alternative hypothesis, I'd be very grateful.
|
| I've cross-posted to our brethern over in rec.woodworking since they
| have specialized knowledge of woods, as well as a shared deeply-held
| hatred of rust on tools!
|
| Thanks very much!
| Dave
|

Wooden instrument cases designed to absorb moisture & preventrust
 

Wed, Aug 8, 2007, 10:25pm (EDT-3)
(LowEnergyParticle) doth qery:
Measuring tools and instruments often come in wooden cases. snip The
idea is that the case will absorb moisture from the tool and thereby
keep it from rusting. snip
I've cross-posted to our brethern over in rec.woodworking since they
have specialized knowledge of woods, as well as a shared deeply-held
hatred of rust on tools!

I've never heard the "wooden case keeps tool from rusting" story
before. My old man was a tool maker. According to him. micrometers,
etc., come in wooden cases to protect them from getting knocked out of
kilte. For rust protection he wiped his micrometers down before putting
them away.. His cases were lined with felt too, I would imagine they
still do that. If I recall right, the felt was slightly oily - but
whether intentionally, or simply from picking up wil from his mikes, I
have no idea. Same with his wooden tool chest.

Last time rec.woodworking got cross-posted to, in good faith, it
led to an invasion of trolls, that lasted for a considerable time.
Appreciate it if you just come over and post next time, rather than
cross-posting.



JOAT
I do things I don't know how to do, so that I might learn how to do
them.
- Picasso

Wooden instrument cases designed to absorb moisture & prevent rust
 

On Aug 9, 1:25 am, LowEnergyParticle wrote:
Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used. The idea
is that the case will absorb moisture from the tool and thereby keep
it from rusting. Usually, these boxes are finished with a varnish on
the outside, and less often, on the inside. When the inside is not
varnished, it is usually left bare. I'm reasonably sure the original
finish is a varnish, because I've tested for shellac with denatured
alcohol, and these boxes generally predate polyurethane.

When I buy a used instrument the box is often in rough condition, and
I like to put them back in good shape by regluing, sanding, etc. I've
been leaving the inside sanded but unfinished (no coating of any kind)
and spraying polyurethane on the outside.

1) to maximize the water absorbtion, should the inside of the boxes
be left unfinished?
2) to maximize the water absorbtion, should the outside of the boxes
be left unfinished?
3) Is clear gloss sprayed polyurethane a good choice for finishing,
given that the water absorbtion issue is much more important than
protecting the finish of the box?
4) For making a new box from scratch, what wood choice would maximize
the water absorbtion?
5) I've seen some pretty old tools with ground cast iron faces arrive
inside intact boxes without rust, so I'm kind of tempted to believe
the whole water absorbtion idea. If anyone can substantiate this
theory, or offer an alternative hypothesis, I'd be very grateful.

I've cross-posted to our brethern over in rec.woodworking since they
have specialized knowledge of woods, as well as a shared deeply-held
hatred of rust on tools!

Thanks very much!
Dave

There is no "water absorbtion issue."

Wood reaches equilibrium water content with its surroundings--most
air, damp wood, dry air, dry wood--and most of what it absorbs comes
from the air around it, not the tool stored inside. In other words, if
you're storing a tool in a humid climate, the wood is going to reach
equilibrium with that climate and will most definitely not absorb any
more moisture to protect the wood. Wood as a rust preventer works well
in Arizona deserts (no rust prevention needed). It's not helpful in
Atlanta or New Orleans.

Wood has traditionally been used to protect measuring tools and
similar instruments from physical damage other than rust. Wood doesn't
absorb water well enough to work as a dessicant. Period. Buy a
reheatable dessicant if you want water absorption. Old tools in wooden
boxes that come through rust free were almost certainly stored in
areas of low humidity.

Wooden instrument cases designed to absorb moisture & prevent rust
 

Jim, JT, and Charlie,

Thank you all very much! I'm going to treat the wooden-box-as-rust-
preventer story as hogwash and finish boxes inside and out with
polyurethane. Furthermore, since I live down on the Gulf Coast near
Houston, where humidity sometimes presents a small problem, I'm going
to buy a case of those small cans of reheatable dessicant and clip one
inside every box.

Thanks very much for the help.
Dave

Wooden instrument cases designed to absorb moisture & prevent rust
 

LowEnergyParticle wrote:
Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used. The idea
is that the case will absorb moisture from the tool and thereby keep
it from rusting. Usually, these boxes are finished with a varnish on
the outside, and less often, on the inside. When the inside is not
varnished, it is usually left bare. I'm reasonably sure the original
finish is a varnish, because I've tested for shellac with denatured
alcohol, and these boxes generally predate polyurethane.

When I buy a used instrument the box is often in rough condition, and
I like to put them back in good shape by regluing, sanding, etc. I've
been leaving the inside sanded but unfinished (no coating of any kind)
and spraying polyurethane on the outside.

1) to maximize the water absorbtion, should the inside of the boxes
be left unfinished?
2) to maximize the water absorbtion, should the outside of the boxes
be left unfinished?
3) Is clear gloss sprayed polyurethane a good choice for finishing,
given that the water absorbtion issue is much more important than
protecting the finish of the box?
4) For making a new box from scratch, what wood choice would maximize
the water absorbtion?
5) I've seen some pretty old tools with ground cast iron faces arrive
inside intact boxes without rust, so I'm kind of tempted to believe
the whole water absorbtion idea. If anyone can substantiate this
theory, or offer an alternative hypothesis, I'd be very grateful.

I've cross-posted to our brethern over in rec.woodworking since they
have specialized knowledge of woods, as well as a shared deeply-held
hatred of rust on tools!

If I were refurbishing an antique, I'd try to match the original condition.
If the interior were unfinished, I don't think I'd paint it with DayGlo
enamel (or anything else).

Wooden instrument cases designed to absorb moisture & preventrust
 

LowEnergyParticle wrote:
Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used. The idea
is that the case will absorb moisture from the tool and thereby keep
it from rusting.

snip

.... and all this time I thought the cases were to prevent the tool from
getting banged, damaged and knocked out of alignment.

--
Jack Novak
Buffalo, NY - USA

Wooden instrument cases designed to absorb moisture & prevent rust
 

On Aug 8, 11:25 pm, LowEnergyParticle wrote:
Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used. The idea
is that the case will absorb moisture from the tool and thereby keep
it from rusting. Usually, these boxes are finished with a varnish on
the outside, and less often, on the inside. When the inside is not
varnished, it is usually left bare. I'm reasonably sure the original
finish is a varnish, because I've tested for shellac with denatured
alcohol, and these boxes generally predate polyurethane.

When I buy a used instrument the box is often in rough condition, and
I like to put them back in good shape by regluing, sanding, etc. I've
been leaving the inside sanded but unfinished (no coating of any kind)
and spraying polyurethane on the outside.

1) to maximize the water absorbtion, should the inside of the boxes
be left unfinished?
2) to maximize the water absorbtion, should the outside of the boxes
be left unfinished?
3) Is clear gloss sprayed polyurethane a good choice for finishing,
given that the water absorbtion issue is much more important than
protecting the finish of the box?
4) For making a new box from scratch, what wood choice would maximize
the water absorbtion?
5) I've seen some pretty old tools with ground cast iron faces arrive
inside intact boxes without rust, so I'm kind of tempted to believe
the whole water absorbtion idea. If anyone can substantiate this
theory, or offer an alternative hypothesis, I'd be very grateful.

I've cross-posted to our brethern over in rec.woodworking since they
have specialized knowledge of woods, as well as a shared deeply-held
hatred of rust on tools!

Thanks very much!
Dave

With all my old tools that have factory wooden cases, the cases are
unfinished, nothing on them except some inked or burned-in labels.
The "moisture-absorbtion" thing is bogus, if anything, they'd retain
moisture and rust the tools even faster. Wood will track the relative
humidity changes. Wood was used because it was cheap and easy to work
and it was softer than the tools contained within. Same as plastic
today.

If I had to put a finish on them, I'd use shellac inside and outside.
It's relatively impermeable to moisture and can be readily removed and/
or touched up. Urethanes are hard to recoat and harder to strip. If
you just do one side, you're going to warp the case due to
differential moisture pickup. If you don't believe it, paint a thin
slat on one side with your favorite varnish, wait until it dries and
hold it edge on to a steaming tea kettle. Same reason both sides of a
tabletop should be finished.

Stan

Wooden instrument cases designed to absorb moisture & prevent rust
 

On Aug 9, 6:56 am, LowEnergyParticle wrote:
Jim, JT, and Charlie,

Thank you all very much! I'm going to treat the wooden-box-as-rust-
preventer story as hogwash and finish boxes inside and out with
polyurethane. Furthermore, since I live down on the Gulf Coast near
Houston, where humidity sometimes presents a small problem, I'm going
to buy a case of those small cans of reheatable dessicant and clip one
inside every box.

Thanks very much for the help.
Dave

Dave, if you use beware of those which contain acids...oak comes to
mind immediately.

I also would strongly recommend using acid free felt or the proper
foam. In particular, I HATE foam that rots and corrodes fine tools.

I also note that if you use dessicant, make sure it does not lie next
to the metal tool. I have had dessicants become saturated and corrode
the very tools that they are supposed to protect.

TMT

Wooden instrument cases designed to absorb moisture & preventrust
 

Wooden instrument cases designed to absorb moisture & prevent rust
 

On Fri, 10 Aug 2007 07:15:42 -0400, with neither quill nor qualm, Joe
quickly quoth:

wrote:


With all my old tools that have factory wooden cases, the cases are
unfinished, nothing on them except some inked or burned-in labels.
The "moisture-absorbtion" thing is bogus, if anything, they'd retain
moisture and rust the tools even faster. Wood will track the relative
humidity changes. Wood was used because it was cheap and easy to work
and it was softer than the tools contained within. Same as plastic
today.

If I had to put a finish on them, I'd use shellac inside and outside.
It's relatively impermeable to moisture and can be readily removed and/
or touched up. Urethanes are hard to recoat and harder to strip. If
you just do one side, you're going to warp the case due to
differential moisture pickup. If you don't believe it, paint a thin
slat on one side with your favorite varnish, wait until it dries and
hold it edge on to a steaming tea kettle. Same reason both sides of a
tabletop should be finished.

Stan


I'd second the recommendation to avoid polyurethane.

Why do all you guys keep misspelling "polyurinestain"?


My favorite is tung
oil. Since I discovered it in the 70s, I've never used anything else.
Even my hardwood floors and kitchen cabinets are treated with it. PU
dings and dents, and you have to sand the whole thing down to fix it.
With tung oil, you just use a little steel wool on the local area and
recoat. The oil soaks into the grain and polymerizes on contact with the
moisture in the air. Of course, I do have to reapply the finish every
few years on the floor and cabinets (surfaces that are subject to wear),
but it's a small price to pay for a finish that really lets the wood's
beauty & character show to its best advantage.

If you like pure tung, give Waterlox a try. It's varnish + tung oil so
it builds more quickly. I buy the medium sheen and degloss from there.


BTW, if you use tung oil, only buy the pure stuff, not the Formby's
crap. I buy it by the gallon at Ace Hardware - their store brand seems
to be tha same as the Park's I used to use. The Behr brand is good, too,
but it imparts a somewhat yellow (honey?) shade to the wood.

For old furniture restoration, though, nothing beats a good shellac
finish. Buy the flakes, and make it up as needed.

The flakes have doubled (tripled?) in price since I bought that pound
of dewaxed SuperBlonde from Keeter about 8 years ago. I'm glad I got
it when I did. Which reminds me that I'm down to half a pint of
denatured alcohol. Time for a gallon refill.

--
The ancient and curious thing called religion, as it shows itself in the
modern world, is often so overladen with excrescences and irrelevancies
that its fundamental nature tends to be obscured.
--H.L. Mencken in "Treatise on the Gods"

Wooden instrument cases designed to absorb moisture & prevent rust
 

On Wed, 08 Aug 2007 22:25:59 -0700, LowEnergyParticle
wrote:

Measuring tools and instruments often come in wooden cases. I've seen
mahogany, birch, poplar, pine, and several other woods used.

Lime (linden, basswood) is one of the best European options for inner
liners. Even better though are some of the Japanese traditional timbers
for cabinetry liners -- a culture with skilled woodworkers and a hard
climate to store things in.

1) to maximize the water absorbtion, should the inside of the boxes
be left unfinished?

http://amol.org.au/recollections/

Museum conservation site, lots of useful advice.