4 blade cleaver repair?

scottyboy · 17-03-2005, 07:20 PM

A m8 of mine has a 4 blade cleaver he damaged one of the blades and gave it to a "friend who fixes aeroplane propellors" who then took it on himself to cut the damaged blade off and weld a new one on and has consequently fecked it up! antone know of anywhere i mite be able to get it repaired?

Tony Davis · 17-03-2005, 07:44 PM

No, throw it away!

Dan · 17-03-2005, 10:08 PM

Not sure, BUT it MAY be worth trying Teignbridge props or Advanced Propolsion System. Both in Newton Abbott (Devon) tel numbers should be on the net somewhere. No promises mind you

scottyboy · 17-03-2005, 10:25 PM

Cheers dan i'll give them a try!

Cyco · 18-03-2005, 12:43 PM

Please don't come anywhere near me or my boat with a prop that has had a blade welded back on.
Any prop shop will advise against this......Not a good idea.

Jono · 18-03-2005, 03:06 PM

Quote:

Originally posted by Cyco
Please don't come anywhere near me or my boat with a prop that has had a blade welded back on.
Any prop shop will advise against this......Not a good idea.

Just to be argumentative really.... Why not? Are props forged or cast? Before you start having a pop at me... I am actually curious about this.....

Cyco · 18-03-2005, 03:49 PM

Because when a prop is made it is one piece.
When you remove a blade then repair it it becomes 2 pieces.
If you are spinning a prop around 7-9000 rpm you will be putting alot of stress through that prop.
The first place that it would break is the weld.
It would start off as a small crack then eventually it would become larger and break away.

No prop shop would touch this this and would most certainly advise you not to run it.

Jono · 18-03-2005, 04:06 PM

Quote:

Originally posted by Cyco
Because when a prop is made it is one piece.
...

Yes, but if it's cast and then properly welded (which is in effect casting) and then solution annealed which has the effect of turning it back into one casting, where's the problem? I mean faults in turbine blades can be repaired in this manner I believe, so why not props?.... or is it the case that people have tried to do it before with disasterous effects and now no one will touch it?

BluFin · 18-03-2005, 04:14 PM

Dont fit welded blades on turbines, grind them out to match & balance but no customer wants a welded one, If it lets go the damage is far in excess of any saving on the blade...

I know props arn't cheap but by the time is was correctly repaired and set, profiled, balanced, is it worth it you are only talking about the difference in cost.

Jono · 18-03-2005, 04:39 PM

Quote:

Originally posted by BluFin
Dont fit welded blades on turbines, grind them out to match & balance but no customer wants a welded one, ..

Don't they?..

A quote from Liburdi, who do this sort of work... I'm searching for one from RR as we used to do some weld repair work for one of their suppliers many moons ago...

Conventional processes for component refurbishment are applied routinely in the industry. These processes (Ref 3, 4) include chemical stripping, superalloy welding, diffusion brazing, heat treatments, and re-coating with diffusion, overlay, and TBC coatings.

I appreciate that there are now "super laser" type methods of repairing, which this company now use to extend the life of the blades, but a Prop is far less "high tec" than a blade....well at least mine is..
But I think your point on cost is the deciding factor..

Matt · 18-03-2005, 04:42 PM

Smartarse!

BluFin · 18-03-2005, 05:37 PM

Not saying you can't weld repair It just most customers will not take that option they will replace the blade.
Knowing what people are like if the weld let go I can assure you they would be coming after you with there legal team for a replacement engine not just the blade or damaged stage. fekers...