SP-20 Motor Noise, Chain Bounce

Hello –

Paul kindly inspected my press before I purchased it. During his inspection he noted that the motor was loud, but quieted down quickly. Paul suggested checking the motor mounts, but those checked out fine. I’ve been trying to figure out the odd motor noise and today I noticed something. The noise seems to be a direct result of the ink drum chain bouncing about. The chain bounces when the motor is first turned on and settles down within a minute or so. It also bounces when the form, oscillator, and rider rollers are lowered into position and it stops bouncing when the ink system is lifted back off the ink drum. Any ideas or suggestions? Let me know if you need a video for reference. Thank you for your help.

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Lad Boyle
10 years ago

Don’t know much about chains on presses, but know a fair amount about bicycle chains: they wear out and if not changed, they will wear the gears, which you don’t want. So, i suggest that you change the chain. To be sure you get the right size chain – length etc – you should get in touch with Fritz at NA Graphics – he will have the correct chain or tell you where to get one. For what a new chain will cost, why chance getting the wrong chain and create more expensive problems to fix?

At least my thoughts

Lad

Paul Moxon, Moderator
Admin
10 years ago

There should be a slight give to the chain. A new one would likely last longer.
The arm movement may mean that the springs are crudded-up. You should buy and install them in pairs.

Paul Moxon, Moderator
Admin
10 years ago

Yes. Any industrial supply should have a replacement. This may be the way to go if the slack is excessive. (Too often I’m dealing with people not able or willing to spend money on a proper repair that I get caught up in these half-assed roadside solutions.)

It’s called chain stretch because the holes that contain the chain’s rollers and rivets ream out over time (going from a circle to an oval) and the cumulative effect makes the chain longer in length.

Paul Moxon, Moderator
Admin
10 years ago

The chain has stretched. It becomes loose when the impression cylinder contacts the ink drum arm (raised plate on operator’s side) pushing the ink drum down. You may be able to move the ink motor downward. There are slots in the motor’s base. Access will require removing the far side panel below the bed. Alternatively, you can remove a link in the chain, but this may also require repositioning the motor.

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