Author Topic: Turning a Crankshaft  (Read 8270 times)

Offline Jo

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Turning a Crankshaft
« on: February 15, 2017, 01:32:36 PM »
I thought you may like to see this series of photos capturing turning a crankshaft from solid. The drawing says make it up but they say it is better from solid so, start by taking a billet of steel and using a suitable hacksaw cut off a length that allows for facing up:

1, Find a suitable sized Vee block, and mount it square to the table.

2, Mount billet on a Vee block, clamp in place and face the end.

3, Not forgetting to cut a couple of flats for driving off

4, Drill for crankshaft centres.

5, Turn round and do the other end.

6, Off to the Lathe And avoiding the driving flats mount in a three jaw and tail stock centre.

7, Not forgetting that coolant may come in handy on these little jobs.

8, One roughed out crank.

More to follow  :naughty:

Jo


« Last Edit: February 15, 2017, 01:57:48 PM by Jo »
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #1 on: February 15, 2017, 02:05:15 PM »
What a Whopper. Almost looks big enough for a BB1 :thinking: EDIT then again that is not your workshop!

How did you get the second set of holes in the same orientation as the first?

J
« Last Edit: February 15, 2017, 02:09:02 PM by Jasonb »

Offline Jo

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Re: Turning a Crankshaft
« Reply #2 on: February 15, 2017, 02:29:11 PM »
How did you get the second set of holes in the same orientation as the first?

You don't think that is going anywhere if you take the clamp off and turn it round while still resting on the vee block do you  :lolb:

Jo
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #3 on: February 15, 2017, 02:36:46 PM »
But that was not how it was done, the drive flat is at the top in the photo where the second end is being machined so it has been turned end for and and rotated. :ShakeHead:

And besides how would you get at the cap screws holding the vee bar to the table without removeing the crankshaft blank :hellno:

Maybe you need to phone a friend ;)
« Last Edit: February 15, 2017, 02:41:29 PM by Jasonb »

Offline Jo

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Re: Turning a Crankshaft
« Reply #4 on: February 15, 2017, 03:06:14 PM »
I knew there was hours of fun to be had watching a crankshaft being turned  :popcorn:

Jo
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Offline Dave Otto

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Re: Turning a Crankshaft
« Reply #5 on: February 16, 2017, 12:57:21 AM »
Looks like I'm going to have to go shopping for a mill with a horizontal spindle.  :lolb:
Nice write up Jo.


Dave

Offline toolznthings

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Re: Turning a Crankshaft
« Reply #6 on: February 16, 2017, 01:18:28 AM »
Following along and paying attention.  :)
Thanks for the visit !
Brian

Offline Gas_mantle

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Re: Turning a Crankshaft
« Reply #7 on: February 16, 2017, 07:40:43 AM »
What engine is it for ?

Offline Jo

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Re: Turning a Crankshaft
« Reply #8 on: February 16, 2017, 07:43:52 AM »
What engine is it for ?

A Reeves Commander.

I was offered the casting set but on the grounds I could not lift the bed plate on its own I turned it down   :-\

Jo
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Offline Gas_mantle

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Re: Turning a Crankshaft
« Reply #9 on: February 16, 2017, 09:12:01 AM »
What engine is it for ?

A Reeves Commander.


That sure is a monster size engine - it will take a big meths burner to get it running  ;)

Offline Dave Otto

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Re: Turning a Crankshaft
« Reply #10 on: February 17, 2017, 01:05:07 AM »
What engine is it for ?

A Reeves Commander.

I was offered the casting set but on the grounds I could not lift the bed plate on its own I turned it down   :-\

Jo

You are making a crankshaft for an engine you don't have castings for??

Offline zeeprogrammer

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Re: Turning a Crankshaft
« Reply #11 on: February 17, 2017, 02:09:27 AM »
What engine is it for ?

A Reeves Commander.

I was offered the casting set but on the grounds I could not lift the bed plate on its own I turned it down   :-\

Jo

You are making a crankshaft for an engine you don't have castings for??

Add the word 'yet' to your last sentence Dave and we might have an idea of her plans.  ;D
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #12 on: February 17, 2017, 07:40:06 AM »
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?

Offline Jo

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Re: Turning a Crankshaft
« Reply #13 on: February 17, 2017, 08:05:34 AM »
No I am not making it. Yes it is Eric's set of castings.

Any set of castings I show the slightest interest in he suddenly gets a new lease of interest in ::) but often as not after a few days he sells them  :-[

No it will not be finished for tomorrow as he spent yesterday buying another machine tool. He may mill the crank pin gaps today but discovered the dividing head has a 50int not the 40 he originally thought it had...

Jo
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Offline Jasonb

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Re: Turning a Crankshaft
« Reply #14 on: February 17, 2017, 08:18:51 AM »
Seeing the HP and LP marked on the crankshaft does it have different throws or journal diameters for each?

I'm sure he must have a 50-40 reducer stashed somewhere