Stratasys F120 - Maintenance Schedule

Z Zero Calibration Manual Tip Calibration
Page 144
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Z Zero Calibration
The printer automatically initiates a Z Zero Calibration before each job is built; "PREPARING"
will be displayed within the Build Status Display of the User Interface while this process is
occurring (see “Build Status Display” (page 42)). Z Zero Calibration must complete successfully
before a build will begin. This calibration requires no user interaction and sets the reference
po
int between the model tip and the substrate to ensure proper positioning for the first layer of
a build.
When performing the Z Zero Calibration a purge of the model tip will be performed. The head
wi
ll then be positioned over the back of the platen and the Z stage will move upward until the
model tip is deflected; this deflection is used to calibrate the toggle sensor. The printer will then
cool the model tip to a temperature below 200°C (392°F). Once cooled, the printer will perform
four tip touches, one per each of the four quadrants of the build tray, by moving the Z stage
upward within that quadrant until the model tip is deflected. Z Zero positioning is then
determined based on the average Z stage position of the four tip touches; the printer will set
the Z Zero position.
Tip Wipe Height Adjustment
Required Tools
• 3 mm hex wrench
Adjusting Tip Wipe Height
1. Power OFF the printer. See “Powering Off” (page 159).
2. Open the front top cover.
3
. Open the oven door.
4
. Manually move the model head (left side) back and forth above the model tip wipe
a
ssembly (left side). Verify that the brush and flicker both make contact with the tip shield.
5. If necessary, adjust the tip wipe height.
a
. Using a 3mm hex wrench, loosen the tip wipe mounting screw at the back of the oven
e
nclosure. See Figure 23
b. Adjust the height of the tip wipe so that the tops of the brush and flicker just contact the
b
ottom of the head tip shield.
If any of the four tip touches used to determine Z Zero is greater than 0.01” away from
the average, homing will fail and the build will be aborted with a "Substrate Not Level"
error.
Always wear gloves when performing maintenance within the oven enclosure or
other high temperature areas.