NEO GEO Evolution (EVS-1) - Experimenting with DIY trackball

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GIZMOGAMES:
You know im loving this build its showing me that the lazy susan idea may just work for me too altho i have a 23"monitor thats mounting plate is 8 wide by 4 down :( so not sure yet how ide measure/attach it any advice bud drop me a pm cheers apart from that bookmarked saved and cant wait to see it further BTW i remember that logo haha but to be honest the artwork looks very resevoir dogs lol kind of haha :D wish i had a decent version of photoshop ide take the original and add your bulldog to that so its not so RABBID hee hee still the red black deffo sells it :D :cheers:
hope to see more soon :)

BadMouth:
Final almost final rotation mech:

I moved the actuator to the bottom so everything could be mounted deeper in the cab.

Adjustable contact points for the limit switches:

Looks nice, but BIG PROBLEM: the actuator does not stop instantly when the switch is tripped. It continues to move just far enough to damage the switch if I let it. :-\ I tested an e-switch, cherry, x-arcade, & zippy. The result was the same. I needed more travel past the trip point.
A longer lever made out of two levers taped together worked, but didn't want to use that permanently.
(I bent the lever like that, the actuator didn't)

Searched fleabay and low and behold..."long lever microswitches" :lol Not cheap, but less work on my part.

I'd have probably seen this coming if I'd read Da' Old Man & Darthpaul's threads better. I seem to remember something about using coin switches. Maybe the brake in mrotate would help, but I'd rather the hardware be set up so nothing can be damaged.

In the cab:

The mdf above and below it are more for alignment and to help hold it while I screw it to some 2x3's on the sides.

It's in there about as deep as it can go! Had to notch out the framing.
The monitor will follow the same angle as the front edge of the cab.
The bezel should end up recessed about 4.5"-5" from the front edges of the cab.

I decided it needed an access panel so adjustments could be made while it was in the cab.

(managed to use screws that were too long :angry: . After the pic was taken, they were replaced with shorter ones and everything sanded down flat.
It will still need some bondo.)

Next time, there will be a monitor mounted in there....and it will move. ;D

DNA Dan:
Why does the actuator keep moving once the limit switch is tripped? am I missing something ? The limit switch should be providing some feedback to your setup, either killing the power, braking the movement, etc.

BadMouth:

--- Quote from: DNA Dan on May 20, 2012, 07:47:19 pm ---Why does the actuator keep moving once the limit switch is tripped? am I missing something ? The limit switch should be providing some feedback to your setup, either killing the power, braking the movement, etc.

--- End quote ---

Just momentum I guess. The switch does kill the power, but the arm continues to move a little less than 1/4" and my current levers only have about 1/8" of travel. (rough estimates)

This stuff is new to me (and fun! ;D ).
When this happened, I assumed that it was normal and would have been accounted for by someone with more experience.

If that's not the case, there's a few things that might be a factor. (at any rate, the longer levers will fix it)

The actuator I'm using is faster than most at 1.5" per second. Most are only around 1/3" per second.

For testing, the actuator is wired to a DPDT switch, with the power wire for each direction going through the NC tab of the limit switches themselves.
Maybe there is a little arching going on inside the limit switch keeping power flowing for a fraction of a second after it clicks.
The actuator is pulling around 1 AMP (12v), nothing too crazy. I don't know what these switches are made to handle, but I haven't smelled smoke. :lol

Eventually I'll be using a motor driver board controlled by mrotate using a parallel port, but I like the way it's set up now for testing.
I don't have to do anything but plug a cigarette lighter adapter in a booster pack and flip a switch back and forth.

darthpaul:
Great job so far, when it comes to the limit switches, the coin switches would have given you more play but if what you are using works, than that is all that matters. With all these rotating LCD monitors using Actuators, I have this idea of building a BarTop with an auto rotating, servo controlled monitor if I can ever finish my current build.

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