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Machine Tip-Over Angle Measuring Equipment

IP.com Disclosure Number: IPCOM000038444D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 3 page(s) / 77K

Publishing Venue

IBM

Related People

Suzuki, N: AUTHOR

Abstract

An equipment is disclosed for easily obtaining a tip-over angle for a large machine, such as a CPU or magnetic disc drive, from a ratio of the changes in weight imposed on legs or levellers of the machine being measured as it is actually tilted at any selected angle. Fig. 1 shows the relation of the center of gravity G of machine 1 with its tilt angle r at C. When the center G crosses over the line BC or reaches at the center G", that is, when the machine is tilted at angle r, the machine is tipped over. If it is assumed that the center G is at one-nth of the line CD in the X direction, the following relationship exists: (1) (2) = n sin a _ .

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Machine Tip-Over Angle Measuring Equipment

An equipment is disclosed for easily obtaining a tip-over angle for a large machine, such as a CPU or magnetic disc drive, from a ratio of the changes in weight imposed on legs or levellers of the machine being measured as it is actually tilted at any selected angle. Fig. 1 shows the relation of the center of gravity G of machine 1 with its tilt angle r at C. When the center G crosses over the line BC or reaches at the center G", that is, when the machine is tilted at angle r, the machine is tipped over. If it is assumed that the center G is at one-nth of the line CD in the X direction, the following relationship exists: (1)

(2)

= n sin a _ . cos r - 1 (3)

sin (a -r) where W is the half of the weight of the machine.

W1 and W2 are the initial weights at C and D.

W1' and W2' are the weights at C and D when the machine is tilted

to move the center G to G'.

X1, X2 and X3 are the distances GG", G'G" and G1'D' in the X

direction.

r is the tilt angle of the machine. When n=2, that is, when the center of gravity G is at the center of the machine in the X direction, the ratio of the changes in weight relative to the tilt angles 5, 10 and 15 can be calculated from the above equations (1),
(2) and (3), as shown in the following table:

a r=5OE r=10OE r=15OE tip-over angle a W1' W2' a W1' W2' a W1' W2' W1 W2 W1 W2 W W

7.5 4,962 1,665 0,3354 - - - - - -

10 2,969 1,496 0,5035 - - - - - -

12.5 2,303 1,394 0,6050 8,773 1,795 0,2045 - - -

15 1,969 1,326 0,6736 4,849 1,658 0,3419 -

- -

17.5 1,768 1,277 0,7224 3,537 1,559 0,4408 12,31 1,850 0,1490

20 1,632 1,240 0,7592 2,879 1,484 0,5153 6,581 1,736 0,2638

25 1,461 1,188 0,8119 2,216 1,378 0,6218 3,701 1,574 0,4251

30 1,357 1,151 0,8483 1,879 1,305 0,6944 2,732 1,464 0,535

35 1,285 1,125 0,8747 1,673 1,251 0,7481 2,239 1,382 0,6170

40 1,532 1,210 0,7898 1,938 1,319 0,6805

45 1,428 1,176 0,8236 1,732 1,267 0,7320

50 1,347 1,148 0,8518 1,580 1,224 0,7751

1

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55 1,461 1,188 0,8119

60 1,366 1,154 0,8452 The relation between the tip-over angle and the ratio of the changes in weight can be plotted as shown in Figs....