humidity level for conditioning new pinblock

[Bob Hull]

Gordon,

What steps would I take to make the shop moisture
proof - is that different than insulating?

Bob 
--- gordon stelter <lclgcnp@yahoo.com> wrote:

> Yeah, mine.
>      And if its a  Kenmore you will find that when
> it
> burns out replacing the motor/compressor costs more
> than buying a  new one. I would recommend building a
> 
> "dry room" big enoiugh for what you're working on,
> or
> moisture proofing your shop. What you will save on
> electricity could pay for it quickly.
>      Thump
> 
> 
> --- Bob Hull <hullfam5@yahoo.com> wrote:
> 
> > Thanks for the feedback about the pinblock mc
> > conditioning prior to drilling.
> > 
> > With the dehumidifier running full tilt again
> (rain
> > here in TN for last several days) the shop
> humidity
> > level has come down.  The pinblock in the hot tent
> > is
> > being basked in 38% rh.  Was 44% yesterday and 54%
> > two
> > days ago.  I don't think the block was exposed to
> > the
> > 60+ rh for too long, so I don't think I'm too
> > worried.
> >  I don't have the Hoadley handbook - is that the
> > Physical Laboratory Handbook?
> > 
> > I think my dehumidifier maybe too small for my
> shop
> > (1400 sq. ft.) since it runs constantly in the
> > spring,
> > summer and fall.  I shoot for about 45% rh.  Does
> > anyone else's dehumidifier in a similar climate
> have
> > to work that hard?  
> > 
> > Bob Hull 
> > 
> > 
> > --- Farrell <mfarrel2@tampabay.rr.com> wrote:
> > 
> > > Well, I haven't seen a reply to your post yet,
> so
> > > I'll take a stab.
> > > 
> > > First of all, if you have a dehumidifier, why is
> > > your shop up to 63% RH -
> > > although that's not really terribly excessive? I
> > > would suppose the best
> > > humidity level would be whatever RH the piano is
> > > expected to live in - or
> > > rather, the middle of the RH range expected.
> > > 
> > > I guess if you live in New Mexico, it may be
> > > worthwhile to let the block sit
> > > for a month or so to let it come somewhere in
> the
> > > range of it's
> > > surroundings. If you live in coastal Washington
> > > State, you may want to wait
> > > a while also while the block absorbs some water.
> > But
> > > for most climates, your
> > > shop is probably not so terribly far from some
> > > midpoint of an expected RH
> > > range for the piano's future.
> > > 
> > > But how long has is been in your shop? Did you
> > just
> > > get it delivered from a
> > > supply house? If so, you may not really have
> much
> > > idea at all about the MC
> > > of the wood.
> > > 
> > > I like to buy my wood at least six months to a
> > year
> > > before I intend on using
> > > it - most of it sits for more than a year or two
> > > before use. I've got a
> > > large supply of rough-sawn spruce, maple and a
> few
> > > pinblocks residing in my
> > > constant-humidity shop. Doing that simply
> > eliminates
> > > this whole
> > > hard-to-answer question/concern regarding wood
> MC
> > > stability. A
> > > several-inch-thick hunk of hardwood can take
> > months
> > > for its MC to come into
> > > equilibrium with its environment, depending on
> the
> > > RH/MC contrast.
> > > 
> > > Bottom line: It's probably OK. If you are not in
> a
> > > rush on this job, let it
> > > sit for a few weeks or however long you can. A
> > good
> > > cross-grain-laminated
> > > pinblock shouldn't be changing all that much is
> > size
> > > anyway with small
> > > changes in MC.
> > > 
> > > Or maybe I should have just kept it short and
> > said:
> > > I dunno.     ;-)
> > > 
> > > Terry Farrell
> > > 
> > > www.farrellpiano.com
> > > 
> > > ----- Original Message ----- 
> > > From: "Bob Hull" <hullfam5@yahoo.com>
> > > To: <pianotech@ptg.org>
> > > Sent: Saturday, October 30, 2004 2:10 PM
> > > Subject: humidity level for conditioning new
> > > pinblock
> > > 
> > > 
> > > > The humidity in my shop today is 63% and
> higher
> > > than I
> > > > usually try to keep it.  I'm getting a block
> > > ready,
> > > > the flange fitting is done; What would be the
> > best
> > > > level for the humidity to be and for how long
> to
> > > > enhance the drilling/pin torque outcome? This
> > > block
> > > > (Weber 5' 6") has been a "bear" for me with a
> > > double
> > > > flange, plus thicker in the bass, and bow or
> > warp
> > > > across the block area of the plate.
> > > >
> > > > I just put the block under a "tent" with 2
> > heater
> > > bars
> > > > and it has dropped the humidity to 54% over
> the
> > > course
> > > > of . I don't have a MC gauge but I have a
> > > > dehumidifier.
> > > >
> > > > I'll appreciate your comments.
> > > >
> > > > Bob Hull
> > > >
> > > >
> > > >
> > > >
> > > >
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