Solver NEXT SPM. Instruction Manual
38
ATTENTION! Do not use the wire cutting scissors for other purposes.
Fig. 6-23
Apex forming procedure includes the following steps:
1. Clamp the wire with the tweezers so that it projects beyond its edge for 2÷3 mm
(see Fig. 6-23).
2. Cut the wire at an angle of 10÷15 degrees as close to its apex as possible and
simultaneously pull the scissors along the wire axis to separate the part being cut off.
This is required to avoid the contact between the cutting edges of the scissors and the
tip apex. Actually, the wire is rather torn off than truncated at the last moment of
contact with the scissor. This results in a sharp apex, formed at the wire’s end
(see Fig. 6-24).
Fig. 6-24. Typical shape of a wire cutoff (apex of the tip)
3. Check the resulting cutoff shape using the optical microscope with 200-x
magnification, if possible. Repeat the cutting process, if necessary.
ATTENTION! Avoid any contact with the tip apex in order not to
damage it.
4. After cutting the wire you may anneal its apex in the flame of an alcohol lamp
for 1÷2 seconds to remove organic substances. Check the apex of the tip using the
optical microscope. The cutoff section should be seen bright, with no trace of carbon-
black or dust.
NOTE. The overall length of the tip should not exceed 10 mm.
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