(Topic ID: 303579)

Pop bumper dwell time

By D-Gottlieb

9 months ago



Topic Stats

  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 9 months ago by D-Gottlieb
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#1 9 months ago

As the title suggests, I am wondering about the action of pop bumpers when comparing two machines- Star Trek (Stern) and Whoa Nellie. Star Trek's bumpers reset much quicker than Whoa Nellie's. Meaning that the cone returns to the rest position sooner. In WNBJM this has the effect of stalling the ball when bouncing off a nearby cushion and back to the bumper while in ST there is none of this and the ball bounces around much more without any stalling. The bumper cone returns to rest in less time. We are are talking hundredths of a second here but there is an obvious difference. Granted WNBJM is a Spike machine and ST is SAM, but the bumpers look identical in their construction. WNBJM is a just opened NIB machine and ST is like new. I have tried different adjustments to the switches and power settings, ensuring the there is no binding, replaced coil sleeves, etc, but now I am thinking it may be in the code- that the code is telling the pop solenoid to be powered for X milliseconds with X being a larger number for WNBJM while ST has a smaller number. Is there any way to determine this? Would a stronger return spring work?

#2 9 months ago

Woah Nellie is effectively a reproduction of an EM design. It wouldn't surprise me if Stern had tuned the coding for firing the pop bumpers to make them more similar to that.

If the coil is firing for a longer period, a stronger spring may get you some miniscule gain on the ring going back up....but it won't solve the delay in the ring being pulled down longer, and too strong a spring is going to make the pops not hit as hard.

#3 9 months ago
Quoted from Frax:

Woah Nellie is effectively a reproduction of an EM design. It wouldn't surprise me if Stern had tuned the coding for firing the pop bumpers to make them more similar to that.
If the coil is firing for a longer period, a stronger spring may get you some miniscule gain on the ring going back up....but it won't solve the delay in the ring being pulled down longer, and too strong a spring is going to make the pops not hit as hard.

I compared the part numbers between the two machines and they are identical. So if it is indeed in coding, is there a way modify this?

#4 9 months ago
Quoted from D-Gottlieb:

I compared the part numbers between the two machines and they are identical. So if it is indeed in coding, is there a way modify this?

Yes. Decompile the code and re-write it to suit your needs, then recompile and debug it.

Not practical but not impossible.

#5 9 months ago

That is what I figured. Thanks.

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