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Bodger Fix What they don't show you in the repair manual - tales of duct tape, bailing wire and WD 40. Bodge, Bush Mechanics, farmers fix, patch, temporary repair, or whatever your definition, tell us YOUR best story of a bodge that got you home!
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
Clouds on Tres Cerros and
Mount Fitzroy, Argentinian Patagonia



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Old 29 Jan 2023
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Something to be aware of is the ground clamp location. It should be as close to the weld as possible, yes, but under no circumstances should the current path go through a rolling element bearing. Welding current traveling through the bearing contact points will ruin the bearing.

Splines on your countershaft expired and you need the sprocket to be welded on as an emergency fix? Don't let the welder clamp onto the engine or frame.
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Old 29 Jan 2023
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Originally Posted by Dirty_Dude View Post
Something to be aware of is the ground clamp location. It should be as close to the weld as possible, yes, but under no circumstances should the current path go through a rolling element bearing. Welding current traveling through the bearing contact points will ruin the bearing.

Splines on your countershaft expired and you need the sprocket to be welded on as an emergency fix? Don't let the welder clamp onto the engine or frame.
I can't imagine anywhere on a bike where the current will pass through a bearing contact point with it's shell instead the path of least resistance which will be the casing that holds the bearing. Unless the ground clamp is insulated with a paint or coating. An interesting thought though. I suppose anything is possible.
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Old 29 Jan 2023
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Surely the example given is possible Ted? Contact either through the countershaft bearing, or various gear teeth or splines?
Or broken bracketry holding a headlamp and the guy holding the hot stick puts the clamp on the main frame. Current could pass through yoke bearings or even try to pass up the clutch cable in extremis.
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Old 29 Jan 2023
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Surely the example given is possible Ted? Contact either through the countershaft bearing, or various gear teeth or splines?
Or broken bracketry holding a headlamp and the guy holding the hot stick puts the clamp on the main frame. Current could pass through yoke bearings or even try to pass up the clutch cable in extremis.
I'm not a coded professional, but I just can't see it happening in the real world. Nor have I heard of it. But I suppose it is possible. It would have to be the only current path though. Which is perhaps almost impossible as every bearing is in a casing of some type.

You're dead right though. Always clamp your earth as close to the workpiece as possible. And disconnect the battery.
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Old 30 Jan 2023
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I'm not a coded professional, but I just can't see it happening in the real world.

It's called excessive current erosion and is well-documented in the bearing industry as a cause of premature failure.


https://evolution.skf.com/en/prevent...n-in-bearings/
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