Hmmmm ......... at tech we were always told never to grind cast iron - cold chisel or file only. Actually, there is a reason, but I'd have to go back thru' the old books to find it > 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.