Thermal Expansion - Stratasys FORTUS 360mc Service Manual

Thermal Expansion

General Information
1.
Thermal expansion is the change in a components physical dimensions due to a change
in temperature.
2.
Thermal expansion does not occur instantly when the temperature surrounding a
component changes. It takes time for the component to reach its thermal dimensions.
This rate of change is affected by:
• Component size - the larger the physical mass of a component, the longer
• The rate of thermal expansion is different for each material type.
Current Oven
ABSi
Temp.
Room temp. 4
ABS-M30, ABSi
--
Auto Cool-Down
ABS-ESD7 --
ASA --
Nylon 12 --
PC-ABS 4
PC 4
Ultem* 9085 6
PPSF 6
Affect on Operation
1.
The oven is heated to a set-point temperature based upon the type of modeling material
that is chosen. (See
2.
The oven temperature reaches the set-point in a minimum of 15 to 20 minutes.
3.
Thermal expansion (or contraction) of oven components continues for several hours.
• The relationships between the platen, the oven compartment, the head,
• Gantry belt tensions will change due to different expansion rates of the
FORTUS 360mc/400mc Service Manual
it will take to expand (or contract) - relative to another component made
of the same material.
Table 2-7: Oven Stabilization Times (in hours)
Material Type Being Installed
ABS-M30 ABS-
ESD7
4 4
-- --
-- --
-- --
-- --
4 4
4 4
6 6
6 6
"Oven Temperature Control" on page
etc. are constantly changing. This results in a significant impact on the
accuracy of the Z Zero position. (See
frame, pulleys, axle bolts, and belts.
ASA Nylon 12 PC-
ABS
4 4 4
-- -- 4
-- -- 4
-- -- 4
-- -- 4
4 4 --
4 4 4
6 6 6
6 6 6
2-46.)
"Auto Z Zero" on page
PC/ Ultem* PPSF
PC-ISO 9085
4 8 8
4 6 6
4 6 6
4 6 6
4 6 6
4 6 6
-- 4 4
4 -- --
4 -- --
2-53.)
2-16