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Crankshaft Cone/taper Reshaping


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#1 dotmatrix

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Posted 04 December 2019 - 01:06 PM

what sort of welding would be best in order to add material to the taper/cone end of a mini crankshaft.
material is missing due to flywheels friction welding themselves onto the crank.

not traditional gas and oxygen welding. this will probably add too much heat
co2 welding will maybe make a welding that is not attached enough sort of like a cold soldering or what do you think?
tic, stick welding? which type would be best, or is it impossible?

#2 mini13

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Posted 04 December 2019 - 01:17 PM

what ever process, your looking at regrinding it to shape once welding,

 

depending what it looks like/how bad it is, choices are,

 

use as is once cleaned up if not too pitted

 

have it reground slightly, but there are definate limits to this as 1 thou off moves the flywheel 7 thou up the crank (iirc)

 

Possibly have is "metal sprayed" & resurfaced, this is a sort of arc metal process that deposits material back on. Ive known of layhaft bearing faces being reclaimed this way using a tungsten spray which is apparently really durable ( at least for bearing surfaces)

 

I'd lay money on it being cheaper to find another crank though unless its somthing spcecial



#3 dotmatrix

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Posted 04 December 2019 - 03:27 PM

what ever process, your looking at regrinding it to shape once welding,
 
depending what it looks like/how bad it is, choices are,
 
use as is once cleaned up if not too pitted
 
have it reground slightly, but there are definate limits to this as 1 thou off moves the flywheel 7 thou up the crank (iirc)
 
Possibly have is "metal sprayed" & resurfaced, this is a sort of arc metal process that deposits material back on. Ive known of layhaft bearing faces being reclaimed this way using a tungsten spray which is apparently really durable ( at least for bearing surfaces)
 
I'd lay money on it being cheaper to find another crank though unless its somthing spcecial


its a cam6581 metro turbo crank, so a bit special I guess.

I think it will be difficult finding someone to do this metal spraying method in Denmark.

I read that someone had success filling the pits with chemical metal, but it does not sound to me like something that would last.

#4 Moke Spider

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Posted 04 December 2019 - 05:23 PM

There are some specialist companies who reclaim and repair Crankshafts.

 

For this job in particular, I would strongly suggest you approach one of them.

 

Getting this wrong won't just result in the flywheel coming loose but can also be a very serious safety issue.






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