(Topic ID: 265428)

Tech: Gottlieb Score Motor


By meSz

59 days ago



Topic Stats

  • 10 posts
  • 5 Pinsiders participating
  • Latest reply 58 days ago by meSz
  • Topic is favorited by 2 Pinsiders

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#1 59 days ago

(Note: The Score Motor I worked on was for a Gottlieb Show Boat)

UPDATE: SKIP TO POST 9 AS A DIAGRAM OF THE MOTOR WAS PROVIDED.

This post I made for two reasons:
1. To confirm I put this motor back together correctly.
2. To provide pictures of this motor for reference as I couldn’t find anything online.

First is to confirm that I put the washer in the correct spot as it fell out without me noticing where it was. Also, I believe I did, verify that I put this together correctly.
5DAB1ACE-7764-43D9-88EE-A5FAF611E203 (resized).jpeg
Now for pictures of putting this back together.
Main gear is in place
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Next picture is of the main gear and third gear in place
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Next picture is with all four gears in place
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Motor and spacer in place
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Side view of motor after rebuild (I assume the Commutator gets pulled in once current flows to the motor???)
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#2 59 days ago
Quoted from meSz:

I assume the Commutator gets pulled in once current flows to the motor?

Yes, that is correct.

#3 59 days ago
Quoted from MikeO:

Yes, that is correct.

Thanks for the post and confirmation in the Commutator. Do you know if I am correct with the washer placement (first picture)?

#4 59 days ago

Late night bump for clarification on the placement of the washer (pic1).

#5 59 days ago

There is also a small spring that goes over one of the shafts. I’ve seen it on several assemblies that I’ve disassembled to replace the stripped fiber gear. Easy to lose the spring. Also, I’m confused about the washer placement question.

#6 59 days ago
Quoted from Steve_B:

There is also a small spring that goes over one of the shafts. I’ve seen it on several assemblies that I’ve disassembled to replace the stripped fiber gear. Easy to lose the spring. Also, I’m confused about the washer placement question.

Oh, I did not see a spring at all. I will have to scour the cabinet. Do you know what gear it goes on?

As for the washer replacement, I am not certain if it's used on the third gear or if it's used on the Commutator? I was thinking the Commutator??? Picture below shows the washer in both places so I am wondering which is correct?

ShowBoat (resized).jpg
#7 59 days ago
Quoted from Steve_B:

There is also a small spring that goes over one of the shafts.

To elaborate a little on steve_b's note, some motors have springs and some don't.

These open frame motors are made with two cast plates that are riveted together to hold the gear shafts in place. Some motors have extra spacers between the two plates (maybe 1/2" tall?). Those spacers allow the rotor to slide back and forth along its shaft. When power is applied the rotor is pulled into the stator (or laminated plates) and starts turning, and at the same time the small gear on the rotor shaft engages with the rest of the gear train. When power is cut the rotor slides out of the stator and disengages the gear at the same time. This allows the rotor to spin down without driving the gear train. It's a simple clutch mechanism that allows the motor to stop suddenly which is important for Score Motors that need to stop in their index positions.

Motors that are mounted with the rotor on a horizontal shaft (e.g. Williams Score Motors) use a spring to push the rotor out of the stator when power is cut. Motors that are mounted with the rotor on a vertical shaft (e.g. Gottlieb Score Motors) rely on gravity to pull the rotor out of the stator so they don't require springs.

Also a couple of Gottlieb motors I checked have their fiber washers on the bottom of the frame. So when power is cut and the rotor drops it falls onto the washer as it spins down.

/Mark

#8 59 days ago

Okay so this changes things a little as I found that there's a second fiber washer so now I am perplexed as to where these should go??? Below is a picture showing where I believe they're to go....
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Quoted from MarkG:

These open frame motors are made with two cast plates that are riveted together to hold the gear shafts in place. Some motors have extra spacers between the two plates (maybe 1/2" tall?).

The two plates on mine is screwed together but I have seen the riveted ones as well. There's four spacers that are 1/4" tall.

Quoted from MarkG:

Those spacers allow the rotor to slide back and forth along its shaft. When power is applied the rotor is pulled into the stator (or laminated plates) and starts turning, and at the same time the small gear on the rotor shaft engages with the rest of the gear train. When power is cut the rotor slides out of the stator and disengages the gear at the same time. This allows the rotor to spin down without driving the gear train. It's a simple clutch mechanism that allows the motor to stop suddenly which is important for Score Motors that need to stop in their index positions.

Motors that are mounted with the rotor on a horizontal shaft (e.g. Williams Score Motors) use a spring to push the rotor out of the stator when power is cut. Motors that are mounted with the rotor on a vertical shaft (e.g. Gottlieb Score Motors) rely on gravity to pull the rotor out of the stator so they don't require springs.

Good to know, thanks!

Quoted from MarkG:

Also a couple of Gottlieb motors I checked have their fiber washers on the bottom of the frame. So when power is cut and the rotor drops it falls onto the washer as it spins down.

This is exactly what I thought as well so thanks for confirming. But now there's the second fiber washer I found so any idea as to where this one goes?

#9 58 days ago

Here's the manual page for the B-7760 motor assembly, don't know if they were using these in 1961, but it might provide some clues...

IMG_1802 (resized).jpg
#10 58 days ago
Quoted from DaMoib:

Here's the manual page for the B-7760 motor assembly, don't know if they were using these in 1961, but it might provide some clues...[quoted image]

Fricken awesome! So both washers go on the rotor!

THANKS for the post

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