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 Post subject: Re: Machines
PostPosted: Sat Sep 25, 2010 2:52 pm 
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As far as I know they are for proper alignment on all earlier plainbearing Bugatti cranksafts.


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 Post subject: Re: Machines
PostPosted: Sat Sep 25, 2010 3:53 pm 
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They are for alinging in the excentrical lathe, to make the big end axles (of whatever you call them). For an 8C, you can cut and grind 2 at a time, then reclamp the crankshaft 90 degrees turned, and do another set of 2.

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 Post subject: Re: Machines
PostPosted: Sat Sep 25, 2010 4:36 pm 
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Herman wrote:
They are for alinging in the excentrical lathe, to make the big end axles (of whatever you call them). For an 8C, you can cut and grind 2 at a time, then reclamp the crankshaft 90 degrees turned, and do another set of 2.

Journals is "whatever you call them! "


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 Post subject: Re: Machines
PostPosted: Sat Sep 25, 2010 5:15 pm 
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OK, noted. Thank you.

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 Post subject: Re: Machines
PostPosted: Sat Sep 25, 2010 10:46 pm 
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Chrankshaft in a lathe . I am not so sure it is a lathe . What kind of machine is it ?


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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 9:34 am 
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Apology for that mistakes


Last edited by Uwe on Fri Oct 15, 2010 8:01 am, edited 1 time in total.

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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 10:02 am 
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A grinding machine !
A grinding machine who can make 20mm wide endlos chips ?
A normal 3 ton lathe would have a problem to make chips like this . And the krankshaft is still not ready machined for grinding , the yournals are not round .


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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 11:06 am 
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Udolahr wrote:
A grinding machine !
A grinding machine who can make 20mm wide endlos chips ?
A normal 3 ton lathe would have a problem to make chips like this . And the krankshaft is still not ready machined for grinding , the yournals are not round .

20mm wide cuts [should this be 20mm deep?]


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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 4:15 pm 
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No, wide. See the picture posted by Jacobug. It is about the width of the chips.

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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 5:15 pm 
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Herman wrote:
No, wide. See the picture posted by Jacobug. It is about the width of the chips.

I am still unsure about the use of the word chips in this connection !


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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 7:34 pm 
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The debris that is usually coming off in enormous amounts, and if you don't clean up often, gets grabbed by the part, flying around dangerously.

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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 10:31 pm 
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Herman wrote:
The debris that is usually coming off in enormous amounts, and if you don't clean up often, gets grabbed by the part, flying around dangerously.

I do very little grinding,although I do use a surface grinder for small parts like Bugatti valvecaps for adjustment.The debris is usually called grit,or swarf.


Last edited by Lazarus on Mon Sep 27, 2010 8:33 am, edited 1 time in total.

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 Post subject: Re: Machines
PostPosted: Sun Sep 26, 2010 11:00 pm 
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OK, if you go in the metal , what ever you call it , if it is 20 mm wide , just make a test .
2mm to 4mm is still OK. But 20mm or 25mm is alien. You need a very big machine like a 10 ton lathe .


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 Post subject: Re: Machines
PostPosted: Mon Sep 27, 2010 6:51 am 
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And that is probably what he had. A big machine.

I recall having seen a pump factory finishing cast iron dredging pumps (approx 5 meter in diameter). The chips / swarf that came off, were small chips, probably 10-15cm long, and 4-5cm wide (they were correcting the flange for the lid).

The pump was horizontal, by the way...

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 Post subject: Re: Machines
PostPosted: Mon Sep 27, 2010 8:35 am 
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Herman wrote:
And that is probably what he had. A big machine.

I recall having seen a pump factory finishing cast iron dredging pumps (approx 5 meter in diameter). The chips / swarf that came off, were small chips, probably 10-15cm long, and 4-5cm wide (they were correcting the flange for the lid).

The pump was horizontal, by the way...

Bugatti had some wonderful machines,If you look at the T57 brochure there is a photo of a T57 crankshaft being turned.Horizontally naturally.


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