Single flute carbide cutters

[Jonathan]

i find it a bit of a dilema when cutting small slots... adding coolant tend to make the chips stick in the slot so theres a lot of re-cutting of chips going on or cut dry and clear the chips with a bit of air

I use both methods when I care about the finish (either that or use a smaller cutter / cut wider slot). After the first few passes put coolant in the slot with pippete, wait for it to go round then blast the chips out of the slot with compressed air then put coolant back in slot and wait... repeat. Depends on the depth and size of the part you may not have to do this for every pass. If it's small part you do as otherwise the billet heats up a lot, then the chips start sticking.

Obviously the best way it to pump the coolant directly over the cutter, but that's not going to end well with an MDF bed!

and use WD40 in alli like you say, a couple of dabs on each pass

I use the white soluble oil coolant from the lathe.