Switchable Wheel from 360o to 270o is it?

[creepfactory]

Has anyone thought of or made a way to have an arcade steering wheel that can switch from a full 360 degrees spin (like sprint) to the I think it's 270 degrees that some arcade games like San Francisco Rush use, and all pc driving games use? So you can have a cab with one wheel, but it can be switched instantly from full spin to partial spin. Maybe some sort or restrictor mechanizm, simple but effective like the 8/4 way restrictor plate used on joysticks? Or even a system of heavy steel pins somewhere on the shaft that restrict the spin to the 270 degree spin? Or would each degree setting require a totally diferent way of reading the spin? Like does a full 360o wheel have a radically diferent sensor, as opposed to a partial spin wheel? Does MAME even care whether you are using a pc wheel or a full 360 wheel on any game. just that it wont control correctly with the wrong spin type? THEN it seems this idea may work, a restrictor pin or some other setup. I want to make a mame sut down cab and dont want to either switch wheels or have tro wheels
Thanks!
James

[Sasquatch!]

They're completely different kinds of inputs, so this wouldn't work.  You'd end up with a 360 wheel that only turned 270, but that wouldn't make it a 270 wheel.

[hooded_paladin]

A 270 degree wheel uses a potentiometer and self-centers with a spring.

A 360 degree wheel uses an optical encoder (like a mouse axis) and does not self center.

However, in MAME you can play driving games with the mouse, which also means that you can play them with a 360 degree wheel, but without the self centering or the limiting to 270 degrees.

But wait, there's more.  If you mount a 360 degree wheel but also make two pins that can slide in and out (for limiting to 270 degrees or not) and a spring that can be unattached from the wheel (for self centering or not) then you've got it made.

[Xiaou2]

 Threres a concept design I made up a while back ago.  Should be doo-able.

[grafixmonkey]

Combine that concept with a way to turn off the mouse input from the codewheel when the pot is engaged, and you are all set.      Or maybe you can configure .ini files to get Mame to ignore mouse input for joystick games, that would probably do the same thing.

Oh, and I would add something to the concept design - get a hollow pipe that the main shaft fits into, and put it around one of the shafts right where the D-pot linkage system is.  Use a dremel with a cone shaped grinding wheel to  taper the inside of the larger tube, so that when the links are put together, one D-link slides nicely into the tapered hole and locks with the other inside the tube.  That way, one D shaft won't have a tendency to slide off the other if the limiting bar hits the sides in a tough race, or if you think you are in 360 mode and try to spin it real fast.