System
description
[email protected] | www.romanoff.com
2019-10-16
4
–17
4.11
Tree making
Pieces made of wax/plastic must be placed in
“tree”-shape. This is done by a small sol-
dering wax wire at (wax-) center sprue. This main sprue is fixed in the rubber
base, the diameter of the rubber base is according to the diameter of the flask. On bigger
trees for bigger machines there is a main wax sprue (ø 8-10 mm). On this main sprue sin-
gle pieces are fixed in a style of a spiral. This is best for cutting off the casting pieces after
casting process. On MC16 this tree is more a bush, pieces are fixed on the button cone
directly. Only a short piece of main sprue is required.
Some hints for the topic “tree making”:
Make sprues as short as possible.
Diameter of sprues should be big enough to guarantee optimal feeding of the cast-
ings with liquid metal.
The middle trunk should be as thick as possible to ensure proper supply of the
cast parts with liquid metal.
Place wax pieces so that wax can flow out easily.
The connection of the waxes to the sprue should be done in a hydro-dynamic
style, to prevent turbulences while pouring liquid metal.
Figure 16: hydrodynamic
not
proper style
Liquid metal is heavy; it can
break away thin parts of the
gypsum. Create all connec-
tions in hydrodynamic proper
style
Figure 17: tree with easy flow of wax and not
Not good
good
Do not place waxes/plastic parts to close to flask cylinder. There should be a dis-
tance of at least 5 mm.
