[Hallicrafters] Casting Old Knobs

[~DA~]

Hi,

Having done this a few times I forget what I do
automatically now.

Also try using a digital scale with the measurements.
The two mixtures might require a weight measurement
rather than a liquid quantity measurement, don't
forget to zero the scale to the measureing cup and to
get the bubbles out swish the mix around inside the
mold while filling and gently tap the mold on the
sides and bottom to dislodge the air. Shwish, tap,
fill, shwish, tap, fill then get it in a pressure pot.
Be aware of undercuts where air can get trapped and
work the mix into the areas.

You'll get it, it just takes time to get the technique
down.

73,
Douglas

--- Roger K8RI <hallicraftersgroup at rogerhalstead.com>
wrote:

> Cook 'em?
> 
> With epoxy and vinyl ester resins we just elevate
> the temps a bit. (not a 
> lot though)
> 
> 
> Roger Halstead (K8RI and ARRL 40 year Life Member)
> N833R - World's oldest Debonair CD-2
> www.rogerhalstead.com
> 
> > In a message dated 1/11/2006 2:42:48 PM Central 
> Standard Time,
> > iluznst at yahoo.com writes:
> > Any little bit, short or extra can  throw your
> > product off. The knobs will either come out sticky
> and
> > never  dry or can be rubbery and never harden.
> > __________
> >
> > I paid attention to the A and B amounts using the
> small measuring cups
> > supplied, but the knobs ARE slightly sticky.  And,
> the one that  feels the 
> > best is
> > bleeding liquid at one small spot in the center of
> the  knob.  The mix is 
> > old,
> > but the bottles appeared to have been well 
> sealed.  I do have some
> > additional casting material, and will see if it 
> makes a difference.
> >
> > Also, one very small air pocket appears on each
> knob.  I thought I was
> > pouring slow enough to let the air escape, but
> maybe not.  It looks like 
> > the one
> > air bubble appears where the mix is first poured.
> >
> > Joe
> >
>
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