(Topic ID: 73074)

Banzai Run, I did the Unthinkable!!!!!!!!!!!!!!!!!!!

By Eddie

10 years ago


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  • 100 posts
  • 52 Pinsiders participating
  • Latest reply 5 years ago by Pball
  • Topic is favorited by 9 Pinsiders

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There are 100 posts in this topic. You are on page 1 of 2.
#1 10 years ago

I just finished restoring a Banzai Run for Modern Pinball NYC and in moving it out of my shop to make way for the next machine I had to lower the head to clear the doorway.

Then it happened the Unthinkable. I forgot to raise the ball carrier in the Upper Playfield before lowering it and snap.

The motorcyclist in the upper playfield dropped to the lower playfield.

In other words in an instant the entire machine was now just a pile of parts.

Those that are familiar with Banzai Run know the significance of the the Ball carrier. Without it there is basically no game.

The part is of course unobtainable and is made of plastic.

This is a must remake part for Planetary Pinball as there may be many machines down just because of it being broken.

It had snapped cleanly in two in a vertical line just past the half ball shapes on the assembly as can be seen in the parts page. Part #4 or 03-8159

The part has to hold a good amount of weight (Coil for Magnet +weight of ball) while moving on its lifter screw with lots of vibration etc yet the broken surfaces to be mated are very small.

Tried various epoxies to no avail as the cured form (after 24hrs) just flakes off and does not adhere, even Plastic specific epoxy had the same result.

Turns out as a last resort in the adhesive plan A anyway (Plan B use metal to fabricated a form of bridge) I came across Locktite Plastics Bonding System

Within 30 seconds it appeared to be holding the halves together with force.

I installed it back into the machine and so far after 20+ cycles of the assembly it appears to be working great.

Very impressive if you visually knew the part shape what it does and the surfaces where it was rejoined

Williams_1988_Banzai_Run_Manual.jpgWilliams_1988_Banzai_Run_Manual.jpg

So far so good but only time will tell.

Just thought I would post this so other BR owners may have a way to save their machines.

According to the Loctite instructions its good on Plexi and poly so this may be the bet ramp repair adhesive around.

I don't have any damaged ramps to try it on.

I will give a follow up as to the BR results after the machine has been brought to Modern.

http://www.loctiteproducts.com/tds/SG_PLSTC_tds.pdf

#2 10 years ago

Glad your back in action Eddie, would like to see a pict of that plastic item to see how its made and can be fabricated.
keep up the good work up there, I might have to put that locktite plastic bonding stuff in my arsenal of parts and products.

Ken

#3 10 years ago

I appreciate the reminder. I could easily have overlooked that detail when I move it next time.

Nice recovery, though!

#4 10 years ago

count me in for remake or two to have on hand. Sorry, at least its back in biz

#5 10 years ago

Wow that looks like something that should be machined from metal, time to break out the plastic printers

#6 10 years ago
Quoted from fusion301:

Wow that looks like something that should be machined from metal, time to break out the plastic printers

Yes, the 3D printers are defiantly the answer to many impossible to find parts these days.

#7 10 years ago

Somewhere in my parts satsh I have one . If I can find ill lyk. Happened to me in the day as well back in 1989. Ordered 2 at the time. less than 10.00 a piece

#8 10 years ago

If there is 2 in there

#9 10 years ago

BSD I believe uses the same mech. It's not exposed as much but could increase the amount of buyers if these were to be re-made. The BR goes through lots more cycles (no pun intended) per game than BSD.

-c

#10 10 years ago
Quoted from CraigC:

BSD I believe uses the same mech. It's not exposed as much but could increase the amount of buyers if these were to be re-made. The BR goes through lots more cycles (no pun intended) per game than BSD.
-c

Its not the same mech.

#11 10 years ago

Is it just the motor that's different? the Rod looks very similar.

-c

#12 10 years ago

The plastic ball carrier is completely different I don't have photos or I would post the differences they both work on the same principle but that is the only similarity.

Too bad as I scrambled to check after your post!

2 weeks later
#13 10 years ago

Update the Body Carrier Broke again as it got hung up on the Upperplayfield glass rubber trim! Guess the fix was not good enough so now I will attempt to make a metal bridge to support the structure.

Questions

How does 3d Printing work?
Can this piece be replicated that way?
Can a 3d printer use the original drawings or do they have to be re-drawn for the printer?
Anyone have a spare to model or sell?
What are the chances of Planetary making this?

Banzai Run carrier Body # 03-8159

Lots of pics I know just so you can see the different angles.

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#14 10 years ago

You can 3D print and then use "lost wax" to cast the part in metal.

Cast parts are just slightly smaller than the "lost" part (you can look up the % losses for different metals), so usually you make the lost part slightly larger to make up the difference.

#15 10 years ago

I have had great success with cyanoacrylate glue on pins. Haven't found anything that it hasn't worked on yet.

I use a different brand which is sold at specialist engineering shops here in NZ.

According to the fantastic interweb (how did we live without it?) you can get it in the USA.

http://www.cyberbond1.com/adhesives/cyanoacrylate-adhesives.aspx

I use the 2028 glue.

Good luck!

rd.

#16 10 years ago

This stuff should hold it too:
71wdule-0HL._SL1500_[1].jpg71wdule-0HL._SL1500_[1].jpg

Not only strong enough to hold part of an engine block together, it can handle up to 500°F temperature

#17 10 years ago

Plastic is tricky to bond. You have to use a plastic cement that actually slightly melts the 2 substrates back together, otherwise it will keep on failing. Have you tried contacting a plastic fabrication shop in your area? They usually sell such cements that work well, the main ingredient is usually MEK or Acetone.

#18 10 years ago

JB Weld is not going to work on plastic.

#19 10 years ago

that can be printed in ABS (very hard and durable) but you are talking HOURS of CAD drawing that. CA is not gonna hold that as there is just too much torque on it. Metal tabs MAY work but you will need to drill and tap. Contact zapdbf.com to see if he can help you with the 3D printing.

#20 10 years ago

I would be interested in two of these ball carriers if anyone reproduces them.

#21 10 years ago

I would be interested as well, I know I'll get around to doing something I'll regret with my game sooner or later.

Steve

#22 10 years ago

I'd love if one was made!

-1
#23 10 years ago
Quoted from Magic_Mike:

JB Weld is not going to work on plastic.

JB weld does work on plastic, I've used it numerous times and nothing else held. I'm blown away by the stuff I have repaired with it and always have some on hand.

#24 10 years ago
Quoted from Toasterdog:

JB weld does work on plastic, I've used it numerous times and nothing else held. I'm blown away by the stuff I have repaired with it and always have some on hand.

The JB Weld in the picture above will not work with plastic, only metal.

JB Weld does make a special epoxy just for plastics, but not this one.

#25 10 years ago

Ambroid liquid cement is the best for plastic, it is an acetone glue. You can get it at the local hobby shop. Works great for playfield plastics too.

Best plastic glue I have ever found.

#26 10 years ago

No reason to 3-D print it. With the right wax, you can do it as it is, repair it as best possible.

#27 10 years ago

Unfortunately due to the particular shape of the piece and its function there is no real place to use epoxy as the area to be bonded is just the small walls exactly where they are joined.

The half sphere shapes cannot be covered or altered as they function as a bearing for the unit as it moves along the playfield in the playfield slot.

Also the coil Magnet power cord must run up through the channel which prevents loading up on epoxy to fill in the area.

The amount of weight supported by the joined area is rather large when you consider the coil magnet plus the weight of the pinball then add the vibration and motion while the unit is active.

Im thinking of using square bar stock milled to fit in the underside slot. Then the rear half of the piece can be screwed into it from the sides ( The horizontal screws and their nuts will have to be very small as they cannot extend past the Half spheres on each side) and the front of the piece can be screwed into the bar stock vertically.
of course a hole will need to be drilled through the stock( Fairly Large One ) for the Coil power cord.

Unfortunately the hole for the power cord will weaken the stock somewhat as there will only be thin walls along the sides of the drilled hole. This is one crazy piece.

#28 10 years ago

Try the right glue before you drill it.

#29 10 years ago

If you end up trying to repair it, what I might try is to drill holes in both parts and tie them together with wire and then epoxy, JB Weld would be a good choice for that method. On very clean breaks I would definitely try CA + a hardener first, but I would think that wire + JB would hold until you find a replacement..

I'm not sure how the part mounts in the game, but if the channel on the underside is not important you could literally fill that with JB weld and that would add some gusto.

My condolences and good luck.

#30 10 years ago

When I got my Banzai delivered from an game co in Calif, they shipped it with the ball carrier down and when i opened up the head it snapped off just like yours. This was 12 years ago so I don't remember what glue I used could have been JB Weld. Also when I fix things with glue(from Goop to Epoxy) I like to add support with a piece of lexan or metal . Looks like you could lay it on the top as the bridge and then glue the heck out of it . Mine has held for 12 years now of constant operation at Lyons Classic Pinball arcade.
Good luck and I would be in for a reproduction if one were available.

#31 10 years ago

Good advice. I would maybe drill a 3mm hole in both pieces, right down the centre, and insert a 50mm long (2") steel rod (3mm round obviously) down the centre and then glue it up. That would give 25mm (one inch) of support either side of the break.

EDIT: doooh I thought it was the shaft that was broken. Non Comprende!

rd.

#32 10 years ago

The proble now is the residue of the previous glues interfering with the new better glues. Have to strip old glue away before tryin new glue.

#33 10 years ago
Quoted from Magic_Mike:

The JB Weld in the picture above will not work with plastic, only metal.
JB Weld does make a special epoxy just for plastics, but not this one.

Um, it says plastic right there on the package?

#34 10 years ago

Jb weld won't hold. You need a glue that will slightly melt the plastic. The local plumbing store will have a heavy duty glue that they use for indoor PVC that is perminant if you want something stronger than the hobby shop glue.

#35 10 years ago

Someone with solidworks and some calipers ( assuming they had the part in hand) could model that in approximately 2 hours.

Then have it printed in ABS using an FDM style printer, insert helicoils, Done. I think the std rate for a printed ABS part is $30 a cubic inch.

#36 10 years ago
Quoted from DanQverymuch:

Um, it says plastic right there on the package?

Concrete, too!

#37 10 years ago

I have a 3d printer. It will make just about anything. I can use PLA or ABS both of which has their own intrinsic positives send negatives. My prussa I3 xl can print extended size of 12x8x8. I can expand to thee heads (different colors) but reduces the first axis by a substantial amount for each head as the heads are stationary on that axis and the bed moves.

Anyway, the drawings must be in 3d or redrawn as the software that runs the printer accepts stl files. Basically the software gets the file which describes a solid. The software then "slices" it to figure out each layer and where the head must travel to deposit the plastic. It also decides via settings, how much infill is inside the item. Usually a percentage of honeycomb infill although other variations are available.

My printer layers are just under 100 microns. 80 if it is tuned and calibrated well.

A quick description of how it works. The head is a heated tip. Think glue gun. The glue stick is just a long 3mm continuous filament. There is a pinch device to feed it through the head at a controlled rate. The temperature of the head is controlled and monitored. The head moves left to right. The table moves forward and backwards. Those two motions make it possible to print fill Cartesian plots. The table also moves down.

The printer lays down the first slice. The table moves down how ever far the resolution setting is. The printer then lays down the next slice or layer. If there is an overhang or something that will need a temporary support during printing, the software will print that sop port and it just pops off. Picture printing a candy cane in layers. The first cylinder is easy. Layer after layer it is just a circle. But when you get to printing the return section, the first layer is just floating in space until you print the top arc where it all connect together. That is where the printer would print a removable support structure so that little section is not floating in space.

Sorry if this was long winded, but the bottom line is that with a good 3d drawing, these parts would be a "start printing at bedtime" and look at it just before morning coffee routine.

I would be happy to answer anymore questions. I don't want to hijack the thread though.

#38 10 years ago

As much as I love my 3d printer...

Why not make a silicone mold of this puppy and then pour it out of alumilite? This stuff is not cheap but it is almost indestructible but it machinable. I have used it a bunch of times and the process is quite easy.

Being so complex, the mold would be a one time thing but would be a fun project.

#39 10 years ago

3D printing is super easy. Just download a free program like Sketchup, and start watching tutorials online.

Once you've modeled the part, sending it to shapeways.com to be printed in their SLS "Strong and Flexible" plastic would work.

-1
#41 10 years ago
Quoted from DanQverymuch:

Um, it says plastic right there on the package?

That's what I thought too. However, I've actually tried it with plastic and it's garbage.

Try it out for yourself and let me know how it worked for you.

#42 10 years ago

Here are photos of my progress so far. First I reglued the pieces using the Loctite Plastic bond as before and I have to say the bond seems really strong but I am not taking any chances.

I used a piece of steel bar stock and cut it down to fit into the coil wire channel.

The fit is so tight I am almost afraid to remove it for final trimming.

I drilled pilot holes through both pieces the plastic and metal.

Before I decide the final dia of the screws.

I then had to test fit the combined pieces to see wether or not they would fit through the lifter slot in the upper playfield and also to check the wire clearance from the coil.

Glad I did the last step as it turned out I have to cut back the barstock about 2 mm for the wires to fit without being pinched.

I also beveled the barstock so as not to cut the wires while they slid against it.

I will also drill a 2nd hole through the horizontal portion as there will be room.

As it is without the screws or any gluing of the plastic to metal the piece feels really solid.

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#43 10 years ago

If anyone wants a 3d model of this part, I'd be happy to model it in solidworks. I'd even print one out of ABS so you have an extra.

#44 10 years ago

watch out the PPS police might sue you

#45 10 years ago

If you can do without the part for awhile, mail it to me. I'll measure it and build a solidworks model for it, and if I can get an estimate on needed quantity, I'll get it quoted in aluminum, steel, plastic, or whatever.

#46 10 years ago
Quoted from flecom:

watch out the PPS police might sue you

I'd be willing to bet they would buy a bunch.

#47 10 years ago

lol, thats me, I was reading this thread thinking I could do that but there seems to be a solution and a few other offering.

I also have a new PLA that has another compound in it to give it ABS qualities, as the down side with ABS is possibly going to be some slight shrinkage and warp - PLA is more stable but it's downside is being a bit brittle - hence why I am changing to this different material.

In addition you can program the density of your print as it will look at the shape being hollow with thin walls- make this 50-75% minimum density fill and it will be very very strong.

I am also running solidworks so if you need something drawn I can assist as well.

#48 10 years ago

Nice job with the steel!

rd

#49 10 years ago
Quoted from Magic_Mike:

That's what I thought too. However, I've actually tried it with plastic and it's garbage.
Try it out for yourself and let me know how it worked for you.

Sorry, you didn't indicate that you had tried it before. I have trouble with unsubstantiated assertions.

#50 10 years ago
Quoted from Purpledrilmonkey:

If you can do without the part for awhile, mail it to me. I'll measure it and build a solidworks model for it, and if I can get an estimate on needed quantity, I'll get it quoted in aluminum, steel, plastic, or whatever.

If I had not already pressed the steel block into the halves and if I had the nerve to send the part out for fear of any type of loss or damage I would take you up on it in a heartbeat.

But I don't want to chance removing the brace and risk breaking the piece again and Im a coward of letting the piece out of my sight so I won't be able to donate the piece to the cause.

But thanks for the great offer and I hope someone with a spare can send you one for the measurements.

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