ENGLISH
14
2.10 admissible weight of the workpieces
Admissible chuck load based on the weight of the gripped workpieces depends on many factors; such as
machining parameters, particularly the way of clamping the workpieces in the chuck.
The admissible weights of workpieces should be considered as reference data only. The variety of chucking and
machining methods makes the accuracy of such values impossible.
During machining a lot of special conditions occur for which the data has to be corrected by an experienced
operator. However, it should be possible for the user who has the approximate data to determine safe and suitable
working conditions.
admissible weight of the workpieces for self-centering scroll chucks
To simplify the approach to this problem without including the effects of cutting/turning forces and inertia forces
of spinning workpieces onto chuck load; the following guide should help to determine the maximum weights of
the workpieces loading the chuck.
admissible revolutions for independent chucks (table 9)
chuck size
80
85
100
125
140
160
200
250
315
400
500
630
710
800
915 1000 1250 1300 1400 1500 1600 1800 2000
n
max
(rpm) steel body
7640 7190 6120 4890 4370 3820 3060 2450 1940 1530 1220 970
860
760
670
610
490
470
440
400
380
340
300
n
max
(rpm) cast iron body
-
-
-
-
-
-
1800 1500 1200 860
690
550
480
430
380
340
280
270
250
230
220
190
170
table 9
admissible revolutions for self-centering and individually adjustable scroll chucks (table 10)
chuck type
chuck size
200
250
315
400
500
630
800
1000
1250
n
max
(rpm) cast iron body
4505
2500
2000
1500
1000
700
540
420
280
210
4605
2000
1800
1200
800
600
480
360
240
170
n
max
(rpm) steel body
4705
3000
2500
2000
1500
1000
750
600
380
-
4805
2500
200
170
1300
800
660
520
330
-
table 10
n - admissible revolutions
n - admissible revolutions
