first ball strike detects at 270

[mccarthym69]

Hey guys , i have a machine that detects first ball strike at 270 ...... anyt ideas.. i am thinking adjustment is needed on the deck lowering hook (equipped with a scotch yoke) ..

[PJ]

I would check the detector.

[drhookmec]

Hey guys , i have a machine that detects first ball strike at 270 ...... anyt ideas.. i am thinking adjustment is needed on the deck lowering hook (equipped with a scotch yoke) ..

Just to clarify, The detector detects standing pins and strike at 90deg.[not 270]
So are you saying the machine is detecting a strike when it should detect standing pins?

If so check your detector rod adjustment.
Also make sure one of the roll pins hasn't broken off the detector rod.

[joeshlep]

could it be the yoke plate is bent pushing the the short stroke out of the way alowing it to go to the floor?

[Steve Stafford (JBEES)]

Please describe what you are seeing.

Does the pinsetter lower on 1st ball, detect strike, sweep pins after raising deck, deck lowers to the floor at 270 degrees and sets a new set of pins?

[mccarthym69]

after a strike on first ball is thrown, rake down, deck to the floor ( not stetting pins), back up , rake sweeps, deck lowers sets new pins.

[drhookmec]

Sounds like your deck lowering hook is dropping back down on the lowering pin at 0deg.

If this just started happening then check the end of the scotch yoke for a broken deck height adjusting bolt.
At the end of the scotch yoke there should be something that looks like this...



If the adjusting bolt that holds this part on breaks the deck will drop down causing
what you are seeing, The bolt has a long pin on the end of it that holds that part in place
and what commonly happens is the pin breaks off.

Compare it to another machine to see if it's the same.

[Steve Stafford (JBEES)]

after a strike on first ball is thrown, rake down, deck to the floor ( not stetting pins), back up , rake sweeps, deck lowers sets new pins.

You stated the deck goes to the floor...at 90 degrees? It should lose the full deck signal if the deck is full when it cycles. This will end up with 20 pins in the moving deck...unless you are only running 19 pins in the machine.

Bottom line...if the deck lowers to 1 inch at 90 degrees, the deck lowering hook is not engaging the pin in the deck lift shaft ears at 0 degrees. This can be an eccentric adjustment, bad bearing in the scotch yoke, missing block (see drhookmec's pic above) in scotch yoke or bad bearings in the deck lift shaft ears.

[mccarthym69]

I am thinking that it could be the lift shaft bearings , or the sheave in the eccentric ring .. Because as i watch it i see that it lowers faster than the others. Now i myself has not and nor did anyone else put a different size pulley on the machine. Any ideas?

[Steve Stafford (JBEES)]

The deck will look like it is lowering faster as it must travel 7 1/2 more inches in the same amount of time. It still is the issue that the lowering hook is not engaging the pin at 0 degrees. Go to 0 degrees and see if the lowering hook will engage the pin by pushing it down. Also...if you put the detector on 2nd ball...does the deck holding hook engage the pin on the deck post to hold the deck up? This might help narrow down the issue.

[mccarthym69]

Yes the deck holding hook will engage.

[drhookmec]

Does the lowering hook engage the pin on the deck lift shaft at 0deg?

[Kanga (James)]

Yes the deck holding hook will engage.

What about the "Lowering Hook" on the 2:1 assembly, as Steve and drhookmec asked? If it doesn't have an opportunity to engage the pin on the deck lift shaft at 0 (Scotch yoke) or just after 0 (link assembly) then the deck can't do a short stroke when on first ball.