Hello,
Using old Maho MH600E mill and trying to drill holes (22 mm diameter) into 20 mm steel (low carbon steel, S355 european) plate. Drilling with U drill that's meant to have through spindle cooling, but the old Maho doesn't have through spindle coolant, so i am having trouble with keeping the inserts cool.
Chips are wrapping around the drill and they form like a fan or a barrier that won't let any coolant reach the tool.
I've been trying to mess with speeds and feeds to get the chip to break but nothing yet. Old soviet union era machinist said that it's normal chip for that type of steel and that i'm probably not getting the chip to break without through spindle coolant anyway.
I tried to remove the chip after every hole and then cool the insert and then drill the hole but it takes a long time and i still broke one of the inserts. Cutting speed 220 m/min, 3180 rpm, feed rate 159 mm/min, 0,05 mm/revolution. These are the insert manufacturer's recommended parameters. What would you change to get the chip to break?
I'm pretty new to CNC machining. Any advice on what to do? Apologies for any grammar errors.
Thanks
Using old Maho MH600E mill and trying to drill holes (22 mm diameter) into 20 mm steel (low carbon steel, S355 european) plate. Drilling with U drill that's meant to have through spindle cooling, but the old Maho doesn't have through spindle coolant, so i am having trouble with keeping the inserts cool.
Chips are wrapping around the drill and they form like a fan or a barrier that won't let any coolant reach the tool.
I've been trying to mess with speeds and feeds to get the chip to break but nothing yet. Old soviet union era machinist said that it's normal chip for that type of steel and that i'm probably not getting the chip to break without through spindle coolant anyway.
I tried to remove the chip after every hole and then cool the insert and then drill the hole but it takes a long time and i still broke one of the inserts. Cutting speed 220 m/min, 3180 rpm, feed rate 159 mm/min, 0,05 mm/revolution. These are the insert manufacturer's recommended parameters. What would you change to get the chip to break?
I'm pretty new to CNC machining. Any advice on what to do? Apologies for any grammar errors.
Thanks