Hi Lee I think that the carbon in the cast iron supplies sufficient cutting lubricant. If you used coollant or cutting oil, I believe that the swarf + carbon would form a heavy sludge, which would gum up the cutter.. Cheers! Hubert ----- Original Message ----- From: "Lee Grant" <leegrant@xxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Wednesday, October 26, 2005 11:58 AM Subject: [modeleng] Cast Iron Coolant > Hi All > I have all ways been told to never to use coolant or cutting oil. when > turning or milling cast iron and never have. Has anybody got any ideas on > why this is.I think I was told that it would cause hard spots in the > iron.. You always use coolant when grinding cast iron or you will end up > with burn marks. > Lee > > -- Attached file included as plaintext by Ecartis -- > -- Desc: "AVG certification" > > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.361 / Virus Database: 267.12.5/149 - Release Date: 25/10/05 > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject > line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.