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720 Degrees Joystick Question
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Spacedueler:

--- Quote from: Xiaou2 on January 08, 2012, 11:41:48 pm --- you might still be able to make a crank arm, but you would probably want to put a bearing directly under the gripped handle, vertically, on the end of the swing-arm itself. 

 You can see assembly pics here:

http://jstookey.com/arcade/720/720-pictures.php[/ur


--- End quote ---

Thanks for that reply and link - I have been visiting jstookey's sight for years on and off.  My current proto-type is much like what you said and it does have the bearing. (I have to get out there at take some photos to post.) The way I have it set up now is with the shaft for the knob/handle coming straight up - it does have the bearing underneath. I had an idea to make a whole different design to get the angle on the shaft, but I canceled it since it wouldn't let you keep your grip - didn't have the window crank effect. Thanks to Paul for posting that it has that.

Now I just hope someone can document how the centering disc works and can answer the questions in my post above to get that part exact.
Spacedueler:
Here's what I've come up with so far:
Paul Olson:
I just tested mine, and although it would make sense that you would see some movement in the Y axis as the 2 notches are read, I am not seeing any with mine. My guess is that since the disc is so much larger on the original stick, it is not enough to generate any visible movement. The space between the two notches probably keeps the quadrature encoder from detecting the direction as well. Mine looks just like a spinner when I spin it on the desktop.
Xiaou2:
By looking at the original's encoder discs... it appears that the notches on the calibration discs are spaced one notch apart.  And the notches match the spinner encoder notches in size and position.

 However, I think the problem is going to be that the smaller encoder disc your using may not be high enough resolution.  Maybe if you used some gearing, to make the encoder spin several times more per revolution.

 They sell some pretty nice gear sets at stevens international:
http://www2.stevenshobby.com:5641/

kit: SVM-MR8

 Even then, you may need to modify gears to suit your needs.
(drill larger shaft holes, screw & glue shaft collars on them, etc)
Spacedueler:
Thanks for the replies. I hope the group sticks with me on this one. I think I have a 720 controller that anyone can build. I'd like to get it perfect. I played 720 last night for 2 hours and it seems perfect. I was able to play a real 720 degrees machine yesterday too (great opportunity!!!). I actually think my joystick plays better - though not completely authentic and it would never hold up to the abuse of a public arcade. The one I played had a lot of slop in the joystick - maybe needed a rebuild?.. maybe that's how they are originally?... Mine is really solid and smooth with the duel bearing may shaft set up. I need to find a way to add a tensioner - it spins as freely as my spinners.


--- Quote from: Paul Olson on January 10, 2012, 03:05:45 am ---I just tested mine, and although it would make sense that you would see some movement in the Y axis as the 2 notches are read, I am not seeing any with mine. My guess is that since the disc is so much larger on the original stick, it is not enough to generate any visible movement. The space between the two notches probably keeps the quadrature encoder from detecting the direction as well. Mine looks just like a spinner when I spin it on the desktop.

--- End quote ---

Paul, What is your mouse sensitivity set at in Windows control panel? Mine was set about halfway across the slider (quite sensitive on the desktop). I adjusted it all the way down - after which I got no Y axis cursor movement on the desktop. In my 720 analog settings I increased Y to 150 and the game runs fine. Would you re-run your test for me with your mouse sensitivity set halfway to max like mine was? If our 720's are calibrating, then the Y axis is register pulse, but we can't see them on the desktop. If you'd run that test again, maybe you to could force some movement out of your joystick's Y axis. Maybe there is a utility out there that captures and displays mouse "pulses...." 

Paul - One last thing... What is your configuration? Original 720 joystick > ?what interface? > what operating system? Thanks.

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