making a crankshaft

[phunkie hiboy]

https://www.youtube.com/watch?v=81UjjSH2iFw&feature=player_embedded

[morrag]

I wouldn't like to attempt that on my old Harrisson!!!!

[Olds]

 
Expected the Chuck and tailstock to offset, to do the journals, not the tools to reciprocate.

[Mendalot]

Always amazes me when I watch things like that, how much material can be removed in one go. I still use tool steel cutting bits in my lathe, cant seem to justify the expense of upgrading to the new style carbide bits and holders.
Great video, thanks for the link
As a footnote, if you find that sort of video interesting, have a look at Keith Fenners vids.......... he's not every ones cup of tea though!

[minimutly]

Strange crank that, is it a v4 with two cylinders tagged on?
Huw

[Olds]

May just be demo piece to show what the machine is capable of.
Only crank that I can think of, that might have both normal and a split offset journal would be for steam. 

[kapri]

The V6 Buick evenfire has straight mains and offset big ends on a shared journal.

EDIT , This is the same as the one in the video isn't it ?

http://www.weberpowerproducts.com/stroker-steel-forged-turbo-buick-crankshaft-p/wre-csgn3625.htm

[Olds]

An equally odd looking crankshaft but don't think it's the same.
The one in the vid appears to have two double journals, with split offset and two single journals that are separated by a main bearing,
(nose- double- main-double- main- single-main-single- tail) I think.The phasing looks equally odd at approximately 180 90 180 

[Stix]

Kev
I'm with Olds on this one, it looks like they have machined both types of journal, a split even fire and a non split odd fire, as Olds says it is probably just an excercise to show the machines capabilities

Stix

[minimutly]

The offset be is quite common nowadays, my mg( rover v6) has them, the only way to make an even firing 90 deg v6, as you say kapri. Makes regrinds impossible apparently?
I much preferred the common be like the prv6, looked bombproof, but I guess it was too much for modern emissions electronics to do to fire the thing.
Huw