View Full Version : Valve Gear Animation

07-29-2010, 04:50 AM
I am animating my model of the Walchart valve gear on a steam engine and using the method William Vaughan illustrates in his tutorial Piston Rig movie I can get the cross head sliding on the X when I rotate the driving wheel but I have tried to rotate the driving wheel by moving the cross head on the x axis as the cross head turns the wheel and not the other way round in a steam engine. Any help would be appreciated

07-29-2010, 05:40 AM
I am a total noob in IK but my guess would be that in real life the wheel has inertia and thus it keeps rotating, but here it's inertia is zero and thus i guess everything comes to a stall or back&forth movement instead of rotation.

I hope some expert will tell how far from thruth is my presumption. ;)

07-30-2010, 12:45 AM
Thanks accom. Using IK I can move the Cross head on X by keyframing the wheel to rotate on bank but I was trying to do the reverse by keyframing the cross head to rotate the wheel as occurs in actual steam locomotives.