POTD was a tune-up on our 1967 Williams Base Hit pitch and bat pinball machine. These were pretty popular back in the day, hit a button to "pitch" the ball (fast, curve or knuckle), and pull a lever to swing the bat. This version (there were variations from around 1950 - 1972) has targets that determine the outcome of the hit. The feature that makes these Williams pitch and bats stand out is the running man unit in the back box. It's cool watching the men run the bases!
1967 Williams Base Hit pitch and bat pinball machine
Men run the bases depending on the target hit by the batted ball
The 1967 version also has three ramps that elevate the ball into an upper tray for a home run. The problem I was having was getting home runs off the center ramp. There's a pot under the game for adjusting bat speed, but that didn't help. I pulled the cover glass to take a closer look. The problem was pretty obvious at that point, the ramp angle for the center ramp was too low to direct the ball into the home run tray.
My game has a reproduction "fence". I shined a light on the sign and could see all of the dents where the ball hits the "fence" off the center ramp
This is an "as it left the factory" fence. These are almost always cracked from balls whacking it. It was thin plastic, was attached to a piece of plywood at the very top and unsupported below. Mine has a piece of 1/4" aluminum for a fence.
Curious why the game designers at Williams would expect an identical center ramp closer to the fence to fly the same as the outer ramps. My game didn't have a problem with hits "clearing the fence" on the outer ramps, but always came up short at center field.
Here's the ramp angle of an outer ramp. Depending on ball speed, it'll comfortably clear the fence.
Center ramp. Pretty obvious why the "fence" was so dented in the middle.
The sheet metal ramp is attached to the table through a plastic boss. The rubber O-ring keeps the ball from hitting the boss.
My fix was to shim up the high side of the ramp. Oh, what a shame, had to add a couple of washers and play for a while to see if the balls were "flying out of the park" or bouncing off the fence! It took a few games, but I finally came up with a pretty good stack of shims. Chucked up a piece of 1/2" polyethylene, center drilled, drilled a clearance hole for the attaching screw, and parted to length.
Center drill
Clearance hole for the attaching screw to the table
Parting to length
Shims/nuts that worked well after MANY, MANY games! Finished bushing to the right.
Ramp angle with new bushing in place
Coming from an engineering background, we're trained to collect data to confirm our fixes. So, headed to the basement as soon as I hit "Post reply" to confirm I've got a right height bushing there!
Thanks for looking, Bruce