[modeleng] Re: Model Engineers Laser Company

Al,
Couldn't it be, that the oil, or whatever,the cooling liquid is, used to 
submerge, the part that is cut, adds some carbon to the metal?
I remember years ago, when the flirts EDM's came, that there were 
similar troubles.
The crew using the wire-fed EDM took weeks to sort out the correct 
composition of the coolant. Only then could parts be put in the milling 
machine /lathe with success, after being "sparked".
Maybe something like that is going on with the laser cut parts...
Patrick
Allen Messer wrote:

>Makes sense to me.
>
>Al
>--- Andrew Houston <andrew@xxxxxxxxxxxxxxxxx> wrote:
>
>  
>
>>Clif
>>
>>But surely, that can only happen if the steel is
>>hi-carbon.
>>
>>Ordinary Mild Steel (MS) can't be hardened by
>>heating/cooling(except by
>>using case-hardening methods) and, I'm reasonably
>>certain that a Laser can't
>>add carbon to the MS which is required for
>>case-hardening.
>>
>>Andy
>>
>>-----Original Message-----
>>From: modeleng-bounce@xxxxxxxxxxxxx
>>[mailto:modeleng-bounce@xxxxxxxxxxxxx]
>>On Behalf Of Clif Walker
>>Sent: 20 July 2007 19:53
>>To: modeleng@xxxxxxxxxxxxx
>>Subject: [modeleng] Re: Model Engineers Laser
>>Company
>>
>>Hi All,
>>
>>The problem that you will find with Laser cut parts
>>is that the edges are 
>>effectively hardened.
>>This means the if you have parts that need machining
>>to clean up like con 
>>rods,you have got the cut through the hard layer.
>>
>>Regards
>>
>>Clif
>>----- Original Message ----- 
>>
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