(Topic ID: 278791)

The Official JJP GnR Owners Thread

By Dallas_Pin

1 year ago


Topic Heartbeat

Topic Stats

  • 22,653 posts
  • 942 Pinsiders participating
  • Latest reply 37 minutes ago by zaphX
  • Topic is favorited by 447 Pinsiders

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Topic poll

“Which one are you buying”

  • CE 185 votes
    18%
  • LE 581 votes
    55%
  • SE 70 votes
    7%
  • None 211 votes
    20%

(1047 votes)

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Topic index (key posts)

71 key posts have been marked in this topic, showing the first 10 items.

Display key post list sorted by: Post date | Keypost summary | User name

Post #34 Feature matrix listing differences for each edition. Posted by Dallas_Pin (1 year ago)

Post #414 GNR Manual - link to JJP site Posted by knobstone (1 year ago)

Post #434 Full Song List Posted by Concretehardt (1 year ago)

Post #755 TECH: PLAYFIELD. Guitar Neck Lock Release tip Posted by kermit24 (1 year ago)

Post #1017 TECH: LIGHTING. Troubleshooting spot light motion issues Posted by wdbthree (1 year ago)

Post #3837 How to use jukebox mode Posted by kermit24 (1 year ago)

Post #4098 TECH: PLAYFIELD. Flipper adjustment tips Posted by Eskaybee (1 year ago)

Post #5052 TECH: PLAYFIELD. Shooter rod power. Change barrel spring. Posted by WannaPinball (1 year ago)

Post #5235 Scorbit jjGnR integration FAQ Posted by jsa (1 year ago)


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#11168 1 year ago
Quoted from RETROCENGO:

THIS is why JJP GnR Pinball playfields are Chipping:

If anyone can give me the an accurate caliber size of the post and the hole size in playfield I can design a sleeve that holds the post firm. Then someone can try it to see how it works.

I am still waiting on my machine.

#11171 1 year ago
Quoted from Vespula:

bumper123
A threaded sleeve the diameter of the existing hole ?

Vespula,

Need post diameter that are loose, and the hole size in the playfield, and the depth of the hole to the faster (approximately).

If we make a bushing it will hold the post stiff an spread the load.. wouldn't need washers and would take the impact of the ball better.. I can sketch sometime up... put it on the 3d printer to try.

Just a thought.

#11172 1 year ago
Quoted from bumper123:

Vespula,
Need post diameter that are loose, and the hole size in the playfield, and the depth of the hole to the faster (approximately).
If we make a bushing it will hold the post stiff an spread the load.. wouldn't need washers and would take the impact of the ball better.. I can sketch sometime up... put it on the 3d printer to try.
Just a thought.

Vespula,

Put the washer side up and the sleeve goes into the playfield hole. Then the energy of the ball hitting the post is absorbed by the playfield hole not the surface not the playfield surface. The drawing attached is a sample.

Just a thought.

pasted_image (resized).pngpasted_image (resized).png
#11176 1 year ago

Pinhead

Exactly...This would remove the surface issue that they are having and support the post from moving in the first place when the ball hits it. I would worry that the silicone would allow too much movement. Try a simple 3d PVC / PLA - Machined sleeve would be better.. drops in from the top.

#11239 1 year ago
Quoted from Chetrico:

Wife is out of town, so I am going to have a lot of time to work on machines this weekend. Not much needs to be done to GnR except for adjusting the spinning disc and replacing the action button mech, however, I do want to spend a little more time on the playfield issues. Has anyone concluded the BEST method to mitigate further damage to the playfields? I have plastic washers, steel washers, JJP washers, mylar rings, Cliffy rings, vinyl iron, and pretty much anything else that has been mentioned in this thread. There are tears around the upper posts that I had covered with plastic washers but the damage has expanded. The lower posts had some pooling but seem to be stable for now. Thank you for everyone's input on this thread!

Just my thoughts on the repair with washers / Mylar rings. If the post is unsupported at the top where the ball hits it and is loose, the force would need to be distributed to the washer... as a sliding moment. This pressure and sliding moment on the surface is basically pushing the clearcoat to pool until it makes a dam or it cracks the surface material. It is like holding a pencil by the eraser and trying to stop the top from moving... the moment at the playfield is amplified because of the lack of support when the ball hits. The clamp pressure of the washer / bolt assembly is only as good as the friction between the two surfaces.

The thought would be to sleeve the top of the bumper post within the playfield hole so the post is snug and supported at the level of the playfield....The force of the ball will be less when it hits and places the energy to the hole not the surface. Like a choking up on the bat in baseball

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