Caf Digital Imaging
MF36
page 9
Tighten the six socket screws evenly in the sequence as shown by numbers 1 to 6 in fig 8. Ensure
that the work tube sealing ring is held firmly against the end of the work tube and is evenly
spaced from the work tube ring about its circumference.
Fit the furnace front panel in position and adjust the work tube front support bracket to support
the weight of the work tube assembly. See fig 9.
Note:
Do not stress the work tube. With the work tube front support correctly adjusted there
should be a slight gap around the circumference of the tube within the aperture of the furnace
heating chamber. This can be tested for by lifting the work tube upwards from the support
bracket, only a slight gap should be observed between the work tube and the support bracket
when the work tube is lifted as far as possible.
3.3.4. Fitting And Adjusting The Door Arm Assembly.
Note:
the refractory door plug is fragile: handle with care.
The door plug is supplied separate from the door arm assembly to avoid transit damage. Fit the
door plug to the door arm assembly before fitting the door assembly to the furnace. Refer to
section 5.4.
Pull out the door slide shaft to its full extension and rotate it fully anti clockwise (view from
front). The door slide shaft will only rotate when it is fully extended.
Remove the four socket screws from the back of the door arm assembly mounting block only; do
not remove the front fixing screws, which are factory set to position the door arm. See fig 10a.
Slide the door arm assembly onto the end of the door slide shaft and secure firmly in the door
open position shown in fig 10. using the four socket screws. Take care to tighten the socket
screws evenly to avoid any distortion in the door arm assembly.
Caution:
To allow the door side shaft to slide in and out, some clearance is required in the door
mechanism; consequently there is a small radial movement in the door slide arm when the door
arm is pushed in towards the work tube. Because of this radial movement it is possible for the
door plug to contact the work tube front seal assembly if the door handle is lifted as the door arm
is pushed inwards: take care to avoid this happening.
Carefully swing the door arm in a clockwise direction (view from front) to its stop position,
ensuring that the door plug does not touch tube end guard. The door plug should be clear of the
furnace in its fully withdrawn position. It should not be possible to push the door arm in towards
the furnace until the door arm is rotated fully clockwise (view from front) and the door plug is in
line with the work tube front aperture.
Attached to the door arm assembly is a conduit carrying the video and power cables for the
camera. Pass the wires through the conduit plate aperture in the left-hand side of the furnace case
and connect the camera power cable connector situated just inside the conduit plate aperture.
Route the camera video cable as shown in fig. 21 and tie into the existing wiring at suitable
points using the cable ties provided.
Note:
take care to route the cable away from sharp edges and hot surfaces.
Fit the camera video cable phono socket into the hole adjacent to the comms socket in the bottom
flange at the rear of the furnace case. Secure using the fixings provided.
Fit the furnace case back panel.
Carefully slide the door plug into the work tube ensuring that it is clear of the front seal
assembly. If the door plug is misaligned, adjustment of its position in relation to the work tube
can be achieved by slackening the front and back door arm fixing screws and rotating the door
arm about the door slide shaft axis. See fig 10a.
3.3.5. Pressure Testing of the Work Tube Assembly.
Note:
To ensure that the work tube assembly has been correctly installed it is necessary to
pressure test the furnace prior to use.
