BS78
(E)
17
3-6-4. Reference Point Position
The reference points are positioned at a 50-mm pitch. The reference points for specific measuring lengths
are shown below.
Fig. 3-24
Deletion of reference point quantity when the reference point is changed or when a vacuum is used is
available as a special specification.
Error
±
1 Unit: mm (inch)
246 (9.69")
146 (5.75")
196 (7.72")
48
(1.89")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
48 (1.89")
96 (3.78")
66 (2.60")
33 (1.30")
23 (0.91")
50
(1.97")
50
(1.97")
23 (0.91")
50
(1.97")
50
(1.97")
93
(3.66")
50
(1.97")
50
(1.97")
446 (17.56")
68
(2.68")
396 (15.59")
43
(1.69")
346 (13.62")
48
(1.89")
296 (11.65")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
20 (0.79")
20 (0.79")
20 (0.79")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
50
(1.97")
420
370
320
270
220
120
170
70
40
