Author Topic: Turning a Crankshaft  (Read 10497 times)

Online Jo

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Re: Turning a Crankshaft
« Reply #15 on: February 17, 2017, 08:37:10 AM »
Seeing the HP and LP marked on the crankshaft does it have different throws or journal diameters for each?

They are different spacing's from the end of the shaft and the drawing shows the HP leads the LP by 90 degrees... ::)

Jo
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #16 on: February 17, 2017, 10:17:44 AM »
Metric sizes on a Stuart drawing, whatever next :ShakeHead:

Online Jo

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Re: Turning a Crankshaft
« Reply #17 on: February 17, 2017, 10:20:05 AM »
Metric sizes on a Stuart drawing, whatever next :ShakeHead:

 :headscratch: That's a Reeves product/drawing designed by David P.

Stuarts do a smaller engine = 6A

Jo
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Offline Alan Haisley

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Re: Turning a Crankshaft
« Reply #18 on: February 17, 2017, 07:32:18 PM »
About how much did that billet weigh? It seems a monster.

Online Jo

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Re: Turning a Crankshaft
« Reply #19 on: February 17, 2017, 08:09:54 PM »
About how much did that billet weigh? It seems a monster.

I was told 60Kgs.

Jo
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #20 on: February 17, 2017, 08:17:57 PM »
That sounds a bit much, assuming it started out as 4" bar then it would need to be just over 3ft long to weigh 60kg :thinking:

60lbs would be nearer the mark

Offline steamer

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Re: Turning a Crankshaft
« Reply #21 on: February 17, 2017, 09:03:42 PM »
Slippery slope Jo!     Steam launches are optimized to consume vast quantities of money!!!

"Thar be dragons!!!!!!"


Dave
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Offline Dave Otto

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Re: Turning a Crankshaft
« Reply #22 on: February 17, 2017, 10:30:04 PM »
You are making a crankshaft for an engine you don't have castings for??

Dave, you must have missed my comment that it was not Jo's workshop.

Muddled Engineer is making the crankshaft

Will he have it finished for tomorrow Jo?

Yes I did miss it; sorry about that.

Dave

Offline steamer

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Re: Turning a Crankshaft
« Reply #23 on: February 17, 2017, 10:34:09 PM »
THAR BE DRAGONS!!!!!
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Online Jo

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Re: Turning a Crankshaft
« Reply #24 on: February 18, 2017, 01:14:06 AM »
That sounds a bit much, assuming it started out as 4" bar then it would need to be just over 3ft long to weigh 60kg :thinking:

60lbs would be nearer the mark

It started at 4 1/2" or 120mm dia, 750mm long. - Cubify calculates it out at 61.23Kg or 66.68Kg.

Jo
« Last Edit: February 18, 2017, 01:20:43 AM by Jo »
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Offline Gas_mantle

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Re: Turning a Crankshaft
« Reply #25 on: February 18, 2017, 01:45:29 AM »
I'd be curious to know what the finished item weighs, there must be 30-40kg of swarf to make to yet :o

Offline Jasonb

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Re: Turning a Crankshaft
« Reply #26 on: February 18, 2017, 07:57:39 AM »
That sounds a bit much, assuming it started out as 4" bar then it would need to be just over 3ft long to weigh 60kg :thinking:

60lbs would be nearer the mark

It started at 4 1/2" or 120mm dia, 750mm long. - Cubify calculates it out at 61.23Kg or 66.68Kg.

Jo

I was going by the fact the ctr holes are more than half way to the edge to get my 4" dia

At 750mm long that would make Eric's mill table about 2ft front to back as there is only 4-6" hanging off the front :headscratch:

I'd say 450mm long max. You should know that some chaps like to exagerate the length of things :LittleDevil:
« Last Edit: February 18, 2017, 08:32:20 AM by Jasonb »

Offline derekwarner

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Re: Turning a Crankshaft
« Reply #27 on: February 18, 2017, 08:14:08 AM »
Folks......the weight calculation  :happyreader: for the crankshaft is just the individual cranks+journals totals = mass & is simple

However from an engineering/metallurgical point, it would be interesting to understand the Grade of the steel billet.........

Derek
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #28 on: February 19, 2017, 07:47:52 AM »
Having seen the crankshaft in the flesh yesterday I can confirm that it is indeed only 400-450mm long.

And the 60kg weight quoted included the rest of the bar that the billet was cut from :lolb:

The full set of castings for this engine were last seen being loaded into the boot (trunk) of Jo's car, your guess is as good as mine what happened to them after that :LittleDevil:

Online Jo

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Re: Turning a Crankshaft
« Reply #29 on: February 19, 2017, 07:59:57 AM »
The full set of castings for this engine were last seen being loaded into the boot (trunk) of Jo's car, your guess is as good as mine what happened to them after that :LittleDevil:

 :thinking: Maybe I should start a thread about making a vertical engine.

Jo
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