Adjustment
11 - 10
11.12 Needle rise, hook-to-needle clearance, needle height and needle guard
Requirement
With the needle bar positioned 1.8 mm after BDC
1. The hook point must be at the needle centre position and clear the needle groove by
0.05 - 0.10 mm.
2. The top edge of the eye of the needle must be 0.8 mm below the hook point.
3. The needle guard must lightly touch the needle.
● Position the needle bar 1.8 mm after BDC (needle rise position).
● Loosen screws 1
(on both sides of the post),
2
and 3.
● Position the hook point at the needle centre, taking care to ensure that the needle is not
deflected by needle guard.
● Position post in accordance with requirement 1.
● Tighten screws 1 and 2.
● While ensuring that bevel gear 4 is not too close to bevel gear 5, and that the hook does
not have too much play, tighten screws 3.
● Adjust the needle height in accordance with requirement 2, see Chapter 11.05 Pre-
adjusting the needle height.
Fig. 11 - 09
1
2
2
3
4
5
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