Hi All,
Can anyone help?
I am trying to create a 20mm x 2mm pitch thread on low carbon (free cutting) Mild Steel, I am getting a poor finish? under a magnifying glass the surface looks "torn"
I have tried several small cuts (0.10mm) different spindle speeds (up to 400 Rpm, obviously I have no control over the feed as the acceleration rate is controlled by the spindle speed,
I have tried leaving just 0.05 to 0.075mm for a final finish cut using a different offset in the tool list,
I am using a coated ER-AG60 Insert flooded with coolant, strangely HSS worked better but the tool life deteriated quickly and I have quite a few to do,
Can anyone give me any hints on spindle speed, insert (Tip) type?
At the moment I am having to leave them plus on dia and then run a die down them and my arms are starting to hurt!
Thanks for any advice,
Allen.