(Topic ID: 253761)

Doctor Who MPF - "Play" in the Main Bracket Assembly

By nhislop

4 years ago


Topic Heartbeat

Topic Stats

  • 16 posts
  • 7 Pinsiders participating
  • Latest reply 4 years ago by nhislop
  • Topic is favorited by 1 Pinsider

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#8 4 years ago

I've been Exactly where you are now.

Its binding and the gearbox is worn.

If there is no binding, both sides raise with very little rocking.

It has to be extremely square from all axis, and completely clean with syl-glide added for lubrication.

It took me several hours to understand the many ways it can bind slightly.

It will always work, but it will be rocky.

No washers needed to fix it.
Just take time to square it up from all directions.

If its low add square shims or even strips of vellum (it doesn't compress)
Washers sink into the wood real fast.

I replaced the motor/gearbox assembly, then proceeded to work out the binding.

#9 4 years ago
Quoted from nhislop:

MPF in the center position, and pull on it to lift it up, does it move?

Is shouldn't move at all.
If it does, your gears are slipping.

In fact, avoid manually moving it to protect the gearbox. Says so in the instructions and manual somewhere.

#11 4 years ago
Quoted from eyeamred2u:

You can't verify what is wrong in your video because you have too much "slop" due to it not being secure to a rigid surface. I created a rig to attach the assembly, then squared it. Only way to troubleshoot issues.

Yep. No way to get an accurate simulation unless its bolted down.

Hopefully exactly the same as the MPF.

#15 4 years ago
Quoted from pinball_faz:

Hey, I've seen a few dozen of these things. That's not bad at all. The action you are recreating however is un-natural. The game never pulls the bracket up, the cam pushes the bracket up. That's a difference.
Above suggestions are good. Squaring the bracket is a must and washers are very common. Slotting the screws in the game to allow for extra gap for the front of the MPF is also a common play.
Follow the canting procedure to help eliminate slop/square up the brackets. A cleanup of everything is certainly in order. It rally won't impact the motion that much but it will make you feel so much better when you resolve these issues
I really prefer getting the action of the brackets outside the game. Place the bottom bracket in a vice (gently) or something to hold it firm and drive it up with a DC power source. 9V-20V will all work fine...I'm sure you have some DC wall-warts out there. Alight the cam such that it's dead center of the brackets (see my guide for the illustrations) and adjust the play with the cant procedure. THEN drop in the game. Adjusting the height comes after that. Oh, pay attention to the angle of the bent tabs at the top of each of the bracket. I was just helping a Pinsider offline with his game and the tabs had a weird twist (he caught that one not me) and when he straightened out the twist the MPF sat dead flat.
Best of luck (and a lot of patience),
faz

Ah yes.
I replaced my bracket with a new one too.

A bit of filing, a lot of twisting in a vice.

The tabs were way off.

The bracket was off square in 6 directions.

It really wasn't made well at all but, after 6 hours of work it ran super smooth.

In fact when I had it running petfectly. I still adjusted it better.

Now it runs like brand new (Cuz it is...lol).

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