THORLABS vytran LDC450B, Руководство пользователя

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LDC450B Large Diameter Cleaver Chapter 6: Cleaving
Rev A, July 28, 2020 Page 15
Lifting levers are used to overcome the very high clamping forces of the FHB magnets. To lift the FHB lid, press
down on the lifting lever first, and then lift the Lid. When closing an FHB Lid, make sure that the lever is in the
downward position: this will prevent the FHB lid from slamming down on the fiber, possibly damaging it. After the
lid comes to rest on its lifting lever cam, it can be closed gently by lifting the lever.
Figure 11 A Lifting Lever Propping up the FHB Lid
Figure 12 Lifting Levers and Thumb Screws
Thumbscrews on the FHB lids provide added clamping force for large diameter fibers (>400 µm) or for fibers with
very slippery coatings requiring additional clamping force. If the thumbscrews are not required, they may be kept
out of the way by threading them backwards into the lids or by removing them completely.
Note that when the thumbscrews are used, the user should be sure that they are undone when operating the lifting
levers to open the FHB Lid.
Also note that thumbscrews are not a substitute for correctly chosen and fitted FHB inserts!
The normal clamping force created by the magnets may be excessive for some applications involving very delicate
fiber (e.g. thin-walled capillary tubes and PCF). If the lids crush the fibers, it will be necessary to reduce the clamping
force. This can be achieved by pushing out the magnets in the lids with a stick, or pulling them out with a rare-earth
magnet. It is prudent to mark one side of the magnets before removal so the orientation and position are easily
identified. After completing work on the delicate fiber, remember to return the magnets to the lid holes facing the
correct direction. They should all be attracted to, not repelled by, their counterparts in the FHB body. The polarity
Thumbscrews
Lift levers to
permit lids to
close fully