Kitagawa HW-08 Instruction Manual Download

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Body

(Incorrect)

(Correct)

Ｔnut

Soft jaw

Ｔnut

Hard jaw

Forming ring

Soft jaw

Perform turning to
set the reference
surface to the
circumference

Align reference

surfaces

Soft jaw

Cutter

Top jaw attaching bolt

Top jaw

T nut

0〜1mm

Reference

Entire stroke

Master jaw

Appropriate stroke

・Use the T nut so that it does not come out from the master jaw. (Refer to Fig.9)
・It if the T nut comes out from the master jaw, the master jaw and T nut will break causing the work to fly out and a

possible precision failure.

・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, which

is dangerous as the chuck or work will fly out.

4-1. Attachment of soft jaw

Fig.9

Fig.12-1

Fig.12-2

Fig.13-1 If a gripping portion is a square

Fig.13-2 If a gripping portion is eccentric

4. Forming Soft Jaw

Table 5

Type

HW-08
HW-10
HW-12
HW-15

Difference permissible range (in diameter)

6.0mm
7.5mm
7.5mm
8.0mm

The attaching position of the soft jaw can be adjusted by loosening the socket head cap screw, attaching the soft jaw
and by changing each serration engagement position.
Use the most appropriate soft jaw considering the shape, dimension, material, and surface roughness of the work and
the cutting conditions, etc.

The following shows an example of soft jaw forming method.

1.Grip the forming ring in the center of jaw stroke as shown in Fig.12-1, and perform turning of the soft jaw

circumference to attain the reference surfaces.

2.If a gripped portion of workpiece is a square, remove the soft jaws and align the reference surfaces as shown in

Fig.12-2, and form the gripping portions with a cutter.

3.If a gripping portion of workpiece is a rectangle or eccentric, form all soft jaws together, and then modify the soft jaw in

eccentric direction, meeting the workpiece. For example, in the case of workpiece as shown in Fig.13-2, form all soft
jaws to the size A, and then modify only the No.4 jaw to the size B.

4-2. Forming soft jaw

When gripping the workpiece by this chuck, basically grip it with 2 pairs of jaws in the same stroke position. However, if
the  workpiece  dimensional  tolerance  varies  largely  or  if  the  workpiece  is  gripped  intentionally  with  2  pairs  of  jaws  in
different  stroke  positions,  the  amount  of  stroke  between  2  pairs  of  jaws  is  different.  This  is  called  the  amount  of
difference in jaw stroke.
Because  of  the  chuck  structural  reason,  the  amount  of  difference  is  restricted.  Use  the  amount  of  difference  in  the
difference permissible range shown in Table 5.

4-3. Difference permissible range

In use of Kitagawa YW cylinder, which one of two pairs of jaws operates first is not definite due to the sliding resistance
variations in each section. To make definite the operating sequence of 2 pairs of jaws, special cylinder is required.
Please make an inquiry.

4-4. Operating sequence of 2 pairs of jaws

・Do not use the chuck exceeding the difference permissible range of jaw strokes. Gripping the workpiece

exceeding the difference permissible range breaks the chuck or results in a workpiece gripping failure, causing
the workpiece to be damaged or to fly out.

DANGER

・If the screw-in depth of the jaw attaching bolt to the T nut is shallow, the T

nut will break, and this is dangerous as the jaw and work will fly out. If the
attaching bolt is too long and comes out from the bottom of the T nut as
well, this is dangerous as the jaw and work will fly out since the top jaw is
not fixed. Therefore, the overall length of the jaw attaching bolt must be
approximately 0 to -1mm from the bottom of the T nut (Refer to Fig.10).

・Use the T nut and the attaching bolts attached to the chuck and do not

use bolts other than these. If commercially available bolts are used for an
unavoidable reason, use bolts at the strength classification 12.9 (strength
classification 10.9 for M22 or more) or more, and pay sufficient attention to
the length.

・Do not rotate the chuck so that the T nut is loosened causing the jaw to fly

out.

・Check that the reference mark on the side of the No. 1 and No.2 master jaws are within the range of the entire

stroke as shown in Fig. 11. Full stroke the jaw at least once a day to check it before work or when supplying
grease, etc. If it goes out of the range of appropriate stroke due to loosening of the draw nut, etc., the work may
not be gripped, and this is dangerous as the work will fly out.

・When gripping the work, use it by keeping the position of the master jaw

within the appropriate stroke range. Gripping in the center of the stroke is
the most stable for the mechanism, and the best precision can be ob-
tained.
・When gripping near the stroke end, the work may not be gripped some-

times according to the deviation, etc., of the gripping part allowance of
the work, and this is dangerous as the work will fly out.

・When gripping near the stroke end, the chuck may break and the chuck

or work could fly out.

Fig.10

Fig.11

DANGER

Table 4

Appropriate stroke range（mm）

4.0

5.0

Type

HW-08