Bio-Rad Components for Older Model Spot Cutter - Manual (Page 30)

Note: The top of the cutting tip is rectangular in shape. If the wrench does not appear to fit
you will need to rotate the cutting tip 90° and then the wrench should fit.
✔ Adjusting Cutting Tip Height
Click on the “Set Cutting Tip Height” icon to move the cutting head to the middle of the
cutting platform. From the "Set Cutting Tip Height" icon, use the "Head Down"
command to assess how far down the cutting tip goes. Make sure a cutting mat and gel
cutting sheet are included to adjust the height correctly. If it is visibly off the cutting
surface, adjust the tip down as described next. The adjustment can be performed with the
instrument "on" and in place in the Set Cutting Tip Height location. Steps for Adjusting
Cutting Tip Height. Cutting tip should be in "Head Down" position.
1. Loosen the spindle hexagonal screw as indicted in diagram 1.
2. Adjust the height by moving the shaft up or down as required.
3. Tighten the screw after adjusted.
When the tip depth looks correct, use the "Test Cut" function to test the cutting depth. A
PVDF membrane on the platform works well for this test. The membrane needs to be wetted
as described for best cutting capability.
Note: If the shaft will not go any further but the cutting tip still needs to be raised, the
carriage needs to adjusted. Use the following procedure to adjust the cutting carriage.
✔ Adjusting the Cutting Carriage
1. Remove the black Cutting Head Cover.
2. Remove the spindle belt, as in diagram 2.
3. Unscrew the ground cable connecting the cutting head to the mounting plate.
4. Remove the spindle cutting assembly by removing the two mounting screws. See
diagram 3.
5. Undo the two hexagonal screws holding the carriage cover, remove cover. See
diagram 3.
6. Loosen the 4 screws fixing the carriage. See diagram 4.
7. Adjust the height as required.
8. Tighten the 4 screws.
9. Place the carriage cover back into position.
10. Mount the cutting assembly using the two screws.
11. Replace the grounding cable, belt, and spindle cover.
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