Guns N' Roses (CE)
Jersey Jack, 2020
Guns N' Roses (LE)
Jersey Jack, 2020
Guns N' Roses (SE)
Jersey Jack, 2020You're currently viewing posts by Pinsider bumper123.
Click here to go back to viewing the entire thread.
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.
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.
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).pngPinhead
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.
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
You're currently viewing posts by Pinsider bumper123.
Click here to go back to viewing the entire thread.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/the-official-jjp-gnr-thread?tu=bumper123 and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Verona, WI