Kitagawa BBT200, Инструкция по эксплуатации

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5-3. Precautions related to usage of jaw
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・
If a soft jaw other than one made by Kitagawa Iron Works is used, the
engagement will be inferior, and the master jaw will be deformed, the gripping
precision will worsen, and the work will fly out due to gripping failure, which is
dangerous.
・
Do not use a top jaw with a different serration pitch from the master jaw. The
engagement of the crests of the serration will become insufficient, therefore,
the serration crests will break when gripping the work, and this is dangerous
as the jaw and work will fly out.
・
Do not use the soft jaw by welding to join for extension. The jaw will break due
to insufficient strength and the serration part will become distorted due to
welding. As a result, the engagement will worsen, the serration crests will
break, and this is dangerous as the work will fly out.