9

Dynamics Utility 691
so that one pin travels further into the slot, the
other must ride hig her in the slot. This is of
limited application. The possible check b ox
combinations are: XXO XXO XOX XOX OXX
OXX OXO XOO XOO OOX OOX OXO
6. *2Moves+1Rotate(complementary):
Turn on two Moves, plus one Rotate that’s
not in the same column as any of t he selec ted
Moves. ( This is a sliding universal joint like
the splined output shaft between the automatic
transmission of a rear-drive car and the drive
shaft.) It can transmit torque and constrain
translationintwodirections,bothorthogonal
totheaxisofrotation.Thepossiblecheckbox
combinationsare:XOXXXOOXXOXOOOX
XOO
7. 3Moves+1Rotate:Turn on three Move s plu s
one Rotate. (This is a universal joint without the
sliding.) It’s typical of automotive applications
where the rear axle is located with the trailing
driveshaft.Thisisanuncommonapplication.
8. * 1 Move (complement ary) + 2 Rotates: Tur n
ononeMovethat’scomplementarytotwo
Rotates.(Thisislikeahockeypuckonice.)The
joint can slide anywhere on a plane, but cannot
fall or tip, and it c annot leave the surface of the
plane. The possible check box combinations
are: XOO OXO OOX OXX XOX XXO
9. 2Moves(onecomplementary)+2Rotates:
Turn on two Moves, one of which is
complementary to one of the two Rotates that
are selected. (T his is like a hockey puck with
a nail through it, and the nail is sliding along
agrooveintheice.) It’sfreetotravelinone
direction, and to rotate about an orthogonal
axis. One possible check box combination is:
XXO XOX
10. *2Moves+2Rotates(matching):Turn on
two Moves and two matching Rotates. This
results in a sliding axle (a shaft that can both
slide in and out of a hole, and rotate with the
hole). The clear Move and Ro tat e axis specifies
the axis along which the joint can slide and
rotate. The p o ssible check box combinations
are: XXO XOX OXX XXO XOX OXX
11. *2Moves+3Rotates:Tur n on two Moves
and all three Rotates. (This is a prismatic or
sliding joint.) The joint transmits no torque,
and force in only one direction. You can use
this in conjunction with the Push effect to
make a hydraulic cylinder. The one clear Move
specifies the axis of movement.
12. *3Moves+2Rotates:Turn on al l three Moves,
andanytwoRotates.Thisisanaxle(themost
common type of joint.) The one clear Rotate
specifies the axis of rotation.
13. Al l Locked: All six check boxes are on. This is
a completely rigid joint.
Interfa ce
D ynam ics rollout
Cont ains all of the surface dynamics controls.