BLF
3.7 Inverted Crucible Option
Take special care over safety considerations: ensure that there is a safe surface on which to place
the crucible when hot. If the process permits, avoid lowering the hearth when the chamber is hot.
Depending on the height of the work-piece, it may be necessary to hold the crucible up in the
chamber when placing the work piece on the hearth; ensure that appropriate tongs are available
before starting.
Clamp Option
This option assists the placing of the crucible over tall workpieces. The “clamp” is provided in the
form of a support shelf which can be fitted to a hinge on the case, and a pair of insulated tongs.
With the hearth lowered, place the support shelf on the hinge, and swing to the side. Use the tongs
to lift the crucible up into the chamber, swing the shelf to the centre, and lower the crucible.
Place the work-piece. Reverse the procedure above and carefully lower the crucible over the
workpiece. Remove the shelf before raising the hearth.
4.0
8
MF23
