Stuff you have fixed today

[Red'n'Black]

Sealed bearings don’t last 5 minutes

edit: well 30,000 minutes lol

Is it that the open bearings get re-greased (assuming the machine is maintained properly) so last longer? Or something else?

One up-coming job is to replace the motor bearings in the compressor, I was going to get the sealed type but you've got me thinking now.

 

[bricol]

Not really fixed but fixing because they sent out the wrong bearings ,resume on Monday .
267 × 200

Chipper bearings gone at 500 hours so going to convert them to greaseable.






This is one the same I converted in 2016 to greasable, not been a moments trouble. Removed the shaft for inspection today

Anything in the manual suggesting when they ought to be replaced?

Regular greasing, like old cars (ie 1920, 30 etc), forces out the crap that gets in, pushes old contaminated grease out.

We try and design for 50,000 hrs between major maintenance - on major bought in design on a project I was was on a couple of years ago, theory said we'd get 38. Management said that might be okay . . . No, I said, 38 hours! Not 38,000 hrs! Took a year to redesign to get theory up high enough to be worth doing.

 

[MCKDAVID]

I'm a big fan of regreasable bearings, and are definitely better in a lot of cases, problem is that the guy with the grease gun needs to know what he's doing. depends on bearing type and installation. Too much grease is often just as bad as not enough...

Had a back to back offshore years ago, could always tell when he'd greased a fan bearing, they were running mad hot, old style plummer blocks with top caps, he pumped in grease until it was full everywhere. Always the same solution, shut everything down, remove about 1/3 of the grease, back to normal running temperature again. He must have been told a hundred times, manufacturers lube schedule called for a block 2/3 full, then 6 monthly add a couple of shots, but he just couldn't (wouldn't) get his head round it....

 

[8ob]

Anything in the manual suggesting when they ought to be replaced?

Regular greasing, like old cars (ie 1920, 30 etc), forces out the crap that gets in, pushes old contaminated grease out.

We try and design for 50,000 hrs between major maintenance - on major bought in design on a project I was was on a couple of years ago, theory said we'd get 38. Management said that might be okay . . . No, I said, 38 hours! Not 38,000 hrs! Took a year to redesign to get theory up high enough to be worth doing.

Nothing in any of the service/user manuals, typical use with standard bearings would be about 750 hours. Feeding them with sweepings, fencing wire and running blunt knives doesn't help.

I'm a big fan of regreasable bearings, and are definitely better in a lot of cases, problem is that the guy with the grease gun needs to know what he's doing. depends on bearing type and installation. Too much grease is often just as bad as not enough...

Had a back to back offshore years ago, could always tell when he'd greased a fan bearing, they were running mad hot, old style plummer blocks with top caps, he pumped in grease until it was full everywhere. Always the same solution, shut everything down, remove about 1/3 of the grease, back to normal running temperature again. He must have been told a hundred times, manufacturers lube schedule called for a block 2/3 full, then 6 monthly add a couple of shots, but he just couldn't (wouldn't) get his head round it....

May be the case with bearings running in a controlled environment, for any kit we run the "over grease" as @bricol says is the only thing pumping out the contaminated grease/grit out of bearings/bushes. The 500 hours the standard sealed bearing ran to vs the 2000+ hours of the greasable conversion sort of proves the point considering its a back to back comparison of the same machine doing the same job. All I have done here is remove the inner seals from the sealed bearings and installed a grease nipple in the centre of the hub so the hub acts as a big grease reservoir.

Bob

Bob

 

[MCKDAVID]

Nothing in any of the service/user manuals, typical use with standard bearings would be about 750 hours. Feeding them with sweepings, fencing wire and running blunt knives doesn't help.


May be the case with bearings running in a controlled environment, for any kit we run the "over grease" as @bricol says is the only thing pumping out the contaminated grease/grit out of bearings/bushes. The 500 hours the standard sealed bearing ran to vs the 2000+ hours of the greasable conversion sort of proves the point considering its a back to back comparison of the same machine doing the same job. All I have done here is remove the inner seals from the sealed bearings and installed a grease nipple in the centre of the hub so the hub acts as a big grease reservoir.

Bob

Bob

no point to prove Bob, I agree with you. In your case, it's the perfect solution, flushing out the contaminants and giving fresh grease is without doubt the best option, as long as the grease and heat has somewhere to go and it's more controllable. The advantage is you know what you're doing and have worked your system to suit your application, unfortunately that's not always the case...
The point I was making is that in some applications, too much can cause problems, in our case it caused over heating as it had nowhere to go.

 

[8ob]

in our case it caused over heating as it had nowhere to go.

That makes sense, with all of our kit I dont think I have ever seen a seal on anything that doesnt just spew out the excess

Bob

 

[bricol]

no point to prove Bob, I agree with you. In your case, it's the perfect solution, flushing out the contaminants and giving fresh grease is without doubt the best option, as long as the grease and heat has somewhere to go and it's more controllable. The advantage is you know what you're doing and have worked your system to suit your application, unfortunately that's not always the case...
The point I was making is that in some applications, too much can cause problems, in our case it caused over heating as it had nowhere to go.

Exactly - had trouble convincing others of similar thing. If the design allows for excess grease to escape, or knackered seals do, then all good.

Had an interesting run of failures a while ago - bearing design would allow excess grease to escape, but it also needed regular shots to replenish - machine has an automatic system (SKF/Lincoln) and injectors all over themachine put add as required at intervals as determined by run time. Works well unless the plant use the wrong grease. Or wrong air pressure to drive the system. Or don't purge air. So if you "grease" with a shot of air, you blow the grease remaining out . . . bearing fails seizes, wipe out a 2 grand cam, requires 4 hrs of downtime to replace, loses few hundred thousand production . . . repeat a week later . . .

 

[MattF]

Other than the fact I've had to order another belt as I cocked up & ordered the wrong profile first, (works, but obviously doesn't sit on the pulleys as nicely as it ought), the pillar drill is finished. Sacrificed some brass wooscrews to make three new screws for the rear electrical cover.



The new motor, being unpainted, doesn't look to much out of place. Thank chuff they don't paint them blue nowadays.

 

[Arc Tourist]

................................... The new motor, being unpainted, doesn't look to much out of place. Thank chuff they don't paint them blue nowadays.

View attachment 291750

View attachment 291751

Looks Good !

 

[MattF]

As you can tell from that close-up of the screw though, the paint job is rough as sin.

 

[Arc Tourist]

As you can tell from that close-up of the screw though, the paint job is rough as sin.

But its Green !

 

[nickk]

Before fitting the replacement cap plate for the turntable on my bandsaw,I rolled a strengthening collar to go around the weak clamping hole,then attached the degrees indicating plate,i really think this should be made from steel ,not C.I.
IF it breaks again,that’s what I’ll use.haven’t used hammer drive screws for over 30 years!

 

[Anguz]

Replaced a busted reed in my newly aquired compressor

 

[JMS1972]

Bit off topic, as its wood but its stopping me playing with the new TIG.

A simple replace a few metres on the decking soon escalated into replace part of the frame , luckily had my dad helping - he's much more of a wood botherer than me

The well known 4" x 3" timber runs left to right , so wet you could poke a screwdriver straight through it. Culprit was some (untreated?) wood supporting its full length wrapped in weed control fabric which I assume holds water.

Couldn't get a 4x3 so 3 4"x1" were screwed together. Not ideal but wood seems to be in short supply for some reason. A great deal of swearing was heard between these two pictures.

I've started replacing the planks now but rain stopped play.

 

[Moose McAlpine]

Chipper bearings gone at 500 hours so going to convert them to greaseable.

View attachment 291612

What year is the machine? When i was at Barklands their 3 TW230s had greasable bearings, with the grease points on the side panel. Had to do a set on a machine with ~900 hours because their stuff is so badly maintained.

My mate's ~2005 TW150 has sealed bearings, which seem very undersized, they're about ⅓ the size of the 230's bearings.

 

[8ob]

What year is the machine? When i was at Barklands their 3 TW230s had greasable bearings, with the grease points on the side panel. Had to do a set on a machine with ~900 hours because their stuff is so badly maintained.
My mate's ~2005 TW150 has sealed bearings, which seem very undersized, they're about ⅓ the size of the 230's bearings.

These are tracked and towed 190`s, also had the same grief with the towed 150`s but modified those to greaseable as well. The rest of the bigger chippers are all greaseable.

Bob

 

[cardiffrob]

JMS1972. Before you nail all that boarding down, why not get one of these plastic skulls off of Amazon (£22) to half bury under the boards. In 20 years when the next owners rip up the decking....

 

[DSR]

As you can tell from that close-up of the screw though, the paint job is rough as sin.

I'm more impressed that the table is still pristine - something that old you expect to see gouge marks etc. but it looks really good.

 

[Moose McAlpine]

Last week's fun..

My aunt had some issues with her car, garage looked at it and quoted £600 for cam cover (with breather inside) and air induction pipe. (which it didn't need) I went and fitted a cam cover but it also had very bad waterpump noise. She used my cousin's car to go to work the next day and the clutch failed. ()

Recovered that, new clutch, slave and master, loaded up and run back to pick this one up..

When i picked it up the chain rattled when i turned the engine off, so new chain kit too.

I wanted to do the valve stem seals, so cams out.

Valve springs out.

Going back together.

Done!

Just as i was about to load up, got a call from a neighbour that his starter had failed, so went and picked that up.

And the following day, fixed that. He's actually a nightmare, a million questions and "since you changed my starter my cooling fan's noisy.."

 

[Barking Mat]

Last week's fun..

My aunt had some issues with her car, garage looked at it and quoted £600 for cam cover (with breather inside) and air induction pipe. (which it didn't need) I went and fitted a cam cover but it also had very bad waterpump noise. She used my cousin's car to go to work the next day and the clutch failed. ()

Recovered that, new clutch, slave and master, loaded up and run back to pick this one up..

View attachment 292089

When i picked it up the chain rattled when i turned the engine off, so new chain kit too.

View attachment 292093

I wanted to do the valve stem seals, so cams out.

View attachment 292094

Valve springs out.

View attachment 292095View attachment 292096View attachment 292097

Going back together.

View attachment 292098

Done!

View attachment 292099

Just as i was about to load up, got a call from a neighbour that his starter had failed, so went and picked that up.

View attachment 292100

And the following day, fixed that. He's actually a nightmare, a million questions and "since you changed my starter my cooling fan's noisy.."

View attachment 292101

What's that a straight diesel six?

Fair play, rather you than me...