[Plugin]SketchyPhysics3 beta.

phy · 13 Mar 2009, 23:23

I'm having trouble with a rear differential, it seems that you can't have gears connected to each other when their hinges are in the same group. When I run the simulation, the gears don't mesh, and when I go to end the sim, it creates a bug splat. Is something wrong or am I doing it wrong?

you can try grouping the hinges with the wheels instead of each other

NorviewsVeteran · 13 Mar 2009, 23:39

That's a good idea, and after trying it a few times, still no luck.

phy · 14 Mar 2009, 00:30

this is what i came up with see if it is what you want

differential (3)1.skp

phy · 14 Mar 2009, 00:32

I grouped the motor with the one wheel you tell me of it is what you want

NorviewsVeteran · 14 Mar 2009, 18:17

That's not really working though- if you lift it up and set it to static, just the wheel with the motor turns, everything else just kind of chills.

phy · 14 Mar 2009, 20:12

yeah i see what you mean

CPhillips · 16 Mar 2009, 01:56

I dont know enough about a differential to know if it is possible to build one in SP or not.

Sorry that model crashes. It has something to do with the gears but I cant quite figure out what.

Wacov · 16 Mar 2009, 11:38

I know for a fact that differentials aren't currently possible in SP without actually making shapes that mesh together. Chris, this model shows what a differential is there for (power distribution), and how it's supposed to work... if more resistance is induced on either wheel, a differential allows the power to be shifted to the other wheel; in the model, the blue parts would connect to the wheels.

Updated

The animation shows how a real differential works, and the slider conrols how much 'resistance' there is on each side.(NOTE: It's not a simulation of a differential, and WILL NOT WORK in a dynamic model. There are no gears, just motors to show what the gears would be doing)

CPhillips · 16 Mar 2009, 18:53

I should say that I dont know why the gears in SP dont work for a differential. Its probably some deficiency in the gears but I dont know what.

Wacov · 16 Mar 2009, 19:17

It's because when the object a gear is on is rotated, it doesn't affect the gear it's connected to; the connected gear is only affected when the gear moves in relation to the object it's attached to. Also, if one gear's object is rotated around the gear it's connected to, it has no effect; for a differential to work, it's crucial that this is fixed. Gears need to be far more dynamic if complex mechanisms like differentials will work.

phy · 19 Mar 2009, 16:29

@norviewsveteran said:

That's not really working though- if you lift it up and set it to static, just the wheel with the motor turns, everything else just kind of chills.

OK NorviewsVeteran is this what you want tell me if it is

Error 404 (Not Found)!!1

(sketchup.google.com)

Wacov · 19 Mar 2009, 16:44

Sorry but I don't think that's it. If you hold one wheel still, the power should be sent to the other wheel.

phy · 19 Mar 2009, 17:03

@wacov said:

Sorry but I don't think that's it. If you hold one wheel still, the power should be sent to the other wheel.

but wacov when you turn the buggy it does send the power to the other wheel and when you hold the one wheel it does send it to the other it jerks a little but when you turn the hidden geometry you can see that it is transferring the power

Wacov · 19 Mar 2009, 17:20

Oh yeah! Sorry... I just grabbed one of the wheels, and it didn't stop, so it didn't look like it was working.

Wacov · 19 Mar 2009, 17:32

The problem with this is that it only works through the cones physically moving each other; what's really needed is a way to use sketchyphysics gears to do it, so the parts don't have to be touching.

phy · 23 Mar 2009, 15:19

cpillips i downloaded the mac beta 2 and it looks like it has sound in it. is that so
and is there a windows version. just wondering

CPhillips · 23 Mar 2009, 19:13

That version has some serious bugs in it that we are trying to fix. Sounds wont exactly be in the next release. More like the one after that.

BTM · 24 Mar 2009, 01:41

...What I think he was talking about is the fact that, when the control pannel is selected, and you use keyboard input (w,a,s,d for the most part), the mac's "alert sound" goes off, and if the key is held, repeats. It can get quite annoying...

...If that's not what he was talking about, I might aswell have mentioned that anyways, even though you probably already knew about it.

CPhillips · 24 Mar 2009, 01:57

@unknownuser said:

...What I think he was talking about is the fact that, when the control pannel is selected, and you use keyboard input (w,a,s,d for the most part), the mac's "alert sound" goes off, and if the key is held, repeats. It can get quite annoying...

...If that's not what he was talking about, I might aswell have mentioned that anyways, even though you probably already knew about it.

I didnt know about that bug. I wonder why it would do that.

But the version he is talking about does have some sound support. Not full on sounds. But you can play a sound when something happens.

BTM · 24 Mar 2009, 02:04

By the way, doesn't he mean mac alpha 2? Or am I not keeping up with what's going on?