Casting T
roublesho
oting
(c
on
tinued)
505.839.3010
Neut
ec/R
io Gr
ande™ J-2
r
R
ev
.F
Page E-2
Sympt
om C
ause
Remedy
Castings appear t
o ha
ve been cast a
t
Flask t
emper
atur
e is t
oo lo
w
.
Check bur
n-
out o
ven f
or pr
oper oper
ation and
a lo
w
er t
emper
atur
e than indica
ted
temper
atur
es
.
Flask is allo
w
ed t
o sit in chamber t
oo long
Cor
rec
t pr
oc
edur
e t
o inser
t flask just pr
ior t
o
while v
acuum is on.
metal c
omplet
ely melting
.
M
etal is c
on
tamina
ted
.
U
se fr
esh metal
.
Poor v
acuum.
Check flask adapt
er gasket
. Check f
or cr
acked
in
vestmen
t. R
eplac
e v
acuum filt
er
. Check f
or
vacuum leaks
.
Inc
omplet
e fill on it
ems tha
t
Poor v
acuum due t
o dir
ty v
acuum filt
er
.
Replac
e v
acuum filt
er
.
pr
eviously filled a
t the same
temper
atur
e.
Vacuum leak
.
Call a Neut
ec™ qualified t
echnician.
Fault
y v
acuum pump
.
Call a Neut
ec™ qualified t
echnician.
O
ven t
emper
atur
e not c
or
rec
t; flask is t
oo c
old
.
Check o
ven t
emper
atur
e f
or ac
cur
ac
y.
Top
of
tr
ee
fills
poor
ly
or
not
at
all
Crucible
is
star
ting
to
leak
just
bef
or
e
the
pour
.
Silic
on,
bor
on
or
flux
residue
in
bott
om
of
while bott
om fills c
omplet
ely
.
crucible bet
w
een sealing r
od and crucible melts
and allo
w
s metal t
o leak
, block
ing t
op of tr
ee
.
U
se an allo
y tha
t does not lea
ve a depost in
crucible
.
