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balancing a crankshaft

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MaybeGuy
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PostPosted: 19:38 - 20 Dec 2008    Post subject: balancing a crankshaft Reply with quote

how would i go about doing this?

would i:
set the crankshaft up in a lathe on 2 dead centres, then file bits off the weights until it didnt turn no matter what the angle?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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hmmmnz
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PostPosted: 21:03 - 20 Dec 2008    Post subject: Reply with quote

i do it with a couple of rollers on easch end of the crank shaft,
with a marker i put a mark on the crank shaft where its out of allignment.
then whack it with a hammer Very Happy no really Very Happy

its one of those jobs that really is best if you just lightly put together the crank with new crank pins (you have new crank pins i take it) ne big end bearings and the conrods hen take it to a decent old bike shop with a press, and get them to press it all back together,
chances are they will get it pritty damn close when the do it that it will only need a few taps to allign it perfectly
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Pete.
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PostPosted: 21:13 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

mattsprattuk wrote:
how would i go about doing this?

would i:
set the crankshaft up in a lathe on 2 dead centres, then file bits off the weights until it didnt turn no matter what the angle?


You don't - you send it away to be done by a man with a clever machine. There are several different 'types' of crank balancing you ought to do some research.
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MaybeGuy
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PostPosted: 21:19 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

Geri wrote:
mattsprattuk wrote:
how would i go about doing this?

would i:
set the crankshaft up in a lathe on 2 dead centres, then file bits off the weights until it didnt turn no matter what the angle?


You don't - you send it away to be done by a man with a clever machine. There are several different 'types' of crank balancing you ought to do some research.


whatever clever machine he has, i'll have it at work Wink
i'll never let anyone else do a job for me that i want doing properly.
whenever i've grudgingly done it, its always gone tits up.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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hmmmnz
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PostPosted: 21:47 - 20 Dec 2008    Post subject: Reply with quote

get some one else to do it, its not an easy job,
ive never done it or a crank with more than 1 cylinder,
and all the ones ive done it on arn't highly strung like the engine you want it done to,

send it away, and then check it before you pu it back together,
or ask one of your work mates, if you have all the stuff to do it at work, then surely some one there knows what they are doing??
you don't!! watch and learn Thumbs Up
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sickpup
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PostPosted: 22:40 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

mattsprattuk wrote:


whatever clever machine he has, i'll have it at work Wink



You have a dynamic crank balancer small enough for a bike crank at work?
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MaybeGuy
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PostPosted: 22:45 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

sickpup wrote:
mattsprattuk wrote:


whatever clever machine he has, i'll have it at work Wink



You have a dynamic crank balancer small enough for a bike crank at work?


do you know where i work?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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hmmmnz
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PostPosted: 22:56 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

whatever clever machine he has, i'll have it at work Wink


You have a dynamic crank balancer small enough for a bike crank at work?

do you know where i work?

answering a question with a question.. i would like to question that Very Happy
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sickpup
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PostPosted: 23:07 - 20 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

mattsprattuk wrote:


do you know where i work?



No I don't but what I do know is that most dynamic crank balance machines are too large to fit a bike crank so unless you work at PJ's or Chris Applebys I would be surprised if you had a machine small enough.

So do you?
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MaybeGuy
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PostPosted: 23:23 - 20 Dec 2008    Post subject: Reply with quote

aha, so so a trick question then?
how big of you.

why question me about something i dont know much about? i know that crankshafts are made where i work for both IC engines, and positive displacement pumps etc, so there would be no reason for it NOT to accomadate a crankshaft this size.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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iooi
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PostPosted: 09:45 - 21 Dec 2008    Post subject: Reply with quote

Quote:
how would i go about doing this?


Quote:
whatever clever machine he has, i'll have it at work


OK.....

Why ask here then, when if you have access to the machinery, and at a guess someone who know's what they are doing......

Or do they keep winding you up with bullshit at work Laughing

Did you try a Google Thumbs Up


To be honest while i can agree that if you want a job doing right, do it yourself. With something like this you could end up making it worse than ever.......
So there are jobs that are best left to the experts.
As has been said if you want to get it done at work, then ask the guy who does it to show you how its done. Karma
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Ariel Badger
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PostPosted: 11:30 - 21 Dec 2008    Post subject: Reply with quote

Why is your crank out of ballance?
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sickpup
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PostPosted: 12:32 - 21 Dec 2008    Post subject: Reply with quote

mattsprattuk wrote:

aha, so so a trick question then?
how big of you.


What trick question, I asked if you had a balancer small enough in my first post?

mattsprattuk wrote:

why question me about something i dont know much about? i know that crankshafts are made where i work for both IC engines, and positive displacement pumps etc, so there would be no reason for it NOT to accomadate a crankshaft this size.


So why are you asking here if you have the equipment at work?
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MaybeGuy
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PostPosted: 13:14 - 21 Dec 2008    Post subject: Reply with quote

because i wouldnt know what equipment to use, as it says in my first post...

Quote:
dynamic crank balancer


thankyou
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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sickpup
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PostPosted: 13:27 - 21 Dec 2008    Post subject: Reply with quote

mattsprattuk wrote:
because i wouldnt know what equipment to use, as it says in my first post...

Quote:
dynamic crank balancer


thankyou


In which case you need a dynamic crank balancer (the clue is in the name) and I'll repeat the first question, do you have one small enough at work for a bike crank?
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MaybeGuy
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PostPosted: 13:30 - 21 Dec 2008    Post subject: Reply with quote

i should think so,
like i said before, they make compressors as well as ICE's, and all sorts of other shit. the compressors have cranks of similar size to the RD350 crank, and i would imagine they are adjustable to some degree?

@ arial 1930
i dont know if its out of true yet, but if it is out, im interested to know how they are balanced.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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G
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PostPosted: 14:11 - 21 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

On the subject, I've got a DRZ engine with a knackered big-end bearing.

Does anyone know the likely cost of getting a new bearing on?
I don't have the tools at my work, what with being in a single office with about 13 Macs and a couple of Dells Smile.
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MarJay
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PostPosted: 16:15 - 21 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

G wrote:
On the subject, I've got a DRZ engine with a knackered big-end bearing.

Does anyone know the likely cost of getting a new bearing on?
I don't have the tools at my work, what with being in a single office with about 13 Macs and a couple of Dells Smile.


Appleby's charged about £150 to rebuild my RGV crank...
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G
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PostPosted: 16:17 - 21 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

MarJay wrote:

Appleby's charged about £150 to rebuild my RGV crank...

Ouch, though it's a bit simpler, that's way too much for me. Did that include all parts?

There is/was a DRZ engine up on ebay for £100 from a cat-b bike; I presume I'd be fine to swap the crank etc from one engine to another?
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Pete.
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PostPosted: 17:02 - 21 Dec 2008    Post subject: Re: balancing a crankshaft Reply with quote

mattsprattuk wrote:
how would i go about doing this?

would i:
set the crankshaft up in a lathe on 2 dead centres, then file bits off the weights until it didnt turn no matter what the angle?


Not being funny Matt but you ask this question then get all defensive when advised or asked simple technical questions. If your work has the equipment then they should have the expertise to use it but from this initial comment you yourself dont.

I mean, you might have a Jumbo-Jet parked in your office carpark but that doesn't make you capable of flying the BCF membership over to Times Square for the New Year.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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sickpup
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PostPosted: 17:03 - 21 Dec 2008    Post subject: Reply with quote

mattsprattuk wrote:

@ arial 1930
i dont know if its out of true yet, but if it is out, im interested to know how they are balanced.


Truing and balancing are two different things.
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Ariel Badger
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PostPosted: 18:56 - 21 Dec 2008    Post subject: Reply with quote

sickpup wrote:

Truing and balancing are two different things.


Buggering up is a third different thing that may come into the equation. I would say be the posts made by Matt that he should send the work to a professional.
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