Collab 2020: Modeling Heavy Equipment (Backhoe)
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@blanchsb and @theluthier I remember now how I did this, actually used Empties and Bones, sort of like this (the set-up is symmetrical):
I’m not a rigger and @waylow will probably laugh at how ‘clumsy’ this is, but, in trying to avoid circular dependencies, I ended up with this;)
@jakeblended same here I just added materials so you can see.
I’ve been tearing apart my cab again lol smh I keep seeing new things.
@adrian2301 at the front, back and side views I keep seeing that the back lower part of the cab gets narrower than the front. So I’m going to stop where I’m at because I keep trying to match the wheel cover thingy…yea I’m a girl and I know nothing about the mechanics of things…I really don’t know what I was thinking lol
Here is the Back view.
And here is the front view
@theluthier don’t feel dumb!
Basically you have a hydraulic cylinder like this:
and you need to snap point P to a certain position as well as point P.001.
Try this without looking at my solution…
So……. I know a little about mechanics and engineering, I’m no expert but here goes:
The idea of the hydraulic piston is for Part A to be pushed and pulled in and out of Part B, In this example P.001 would be aligned with the chassis, but the rotation is free, meaning there is no force rotating P.001. The rotation of P.001 happens when the arm is lifted or lowered by a separate piston. If P is attached to the bucket, the push and pull of this piston is to rotate the bucket, so with the piston extended, or pushed, the teeth of the bucket would point towards the ground, and when retracted, or pulled, then the teeth would point towards the sky.
So this would suggest that P.001 would be constrained in location only, or aligned with the chassis, but free to rotate. The other point to consider is that parts A and B must always be aligned exactly on the same axis. The rotation of the bucket at P is dependent on the position of A in relation to B along this axis. So this piston controls rotation at P or more precisely the rotation of the bucket. The rotation at P.001 is controlled by the movement of other parts, or the lifting of the arm by another piston, But the location of P.001 in relation to the chassis will always stay the same. Part B would move along or over Part A.
So to do this in Blender:
I WOULDN’T HAVE A CLUE
OK @ketre , The Fenders as they say in some parts, wheel arches in others, are not quite complete, as to say they need to be extended in the x direction in towards the cab so I would ignore them as a reference for now I was going to wait and use the cab as reference. But your right the cab has got an awkward shape, it probably is shaped around the fenders, but I wouldn’t worry about trying to do that. I would suggest at the point where the angle changes just above the fenders, it should be more or less vertical or even angled inwards. See the blue lines I have added to this Image. It wont go any lower than this as that is approximate height of the chassis. but I would go with this for now.
@adrian2301 all right, here we go – I’ve got the “clamps” on the back of the slide frame, and adjusted the cylinders for the correct clearance:
Here is my updated file – but, I already submitted my previous file to Kent on Saturday, so these corrections probably won’t make it into the stream unless Kent grabs them at the last moment, ha!
@ketre you know what I bet would REALLY help you with that – and help a bunch of other people’s components too – is a decent top-down plan view of the whole backhoe, but for the life of me I just can’t find one – not even on that website with all the part diagrams. It’s super-frustrating!
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