Quick CNC question about M08 code...
Quick CNC question about M08 code...
(OP)
On a machining center typically, when do you turn on / off the coolant pump? Does it need to be off before reaching the tool changer, on before leaving it?
Any suggestions / methods are appreciated. thanks.
Any suggestions / methods are appreciated. thanks.





RE: Quick CNC question about M08 code...
RE: Quick CNC question about M08 code...
RE: Quick CNC question about M08 code...
Larry
Larry Coyle
Managing Partner
Cylinder Head Engineering, LLC
CNC Porting
De Soto, KS 66018
RE: Quick CNC question about M08 code...
turning the pump on and off
advantages = less foam in the tank - more quiescent time for fines to settle or be filtered
disadvantages + there may be a lag in time between when the machine starts to cut and the fluid reaches the point of cut leading to tool failure from thermal shocking -- more wear and tear on the coolant pump etc.
shutting off fluid flow with a valve
advantage = fluid is instantly available - less chance of air being captured in the coolant delivery system
disadvantage = dead heading the pump can cause foam in the tank == can raise the operating temperature of the working solution can be hard on rotary unions and seals
A.R. "Andy" Nelson
Engineering Consultant
anelson@arnengineering.com
RE: Quick CNC question about M08 code...
Most normally you turn it off before the G91G28Z0 move.
Some do this right after the cuts finished.
G1Z2.F100.M8;
G91G28Z0;
G91G28X0Y0;
Tool change or M30
and on and on
RE: Quick CNC question about M08 code...
Jamey
Visit www.cncalarms.com for CNC related alarms and to lookup troubleshooting tips.
RE: Quick CNC question about M08 code...
Most posts can be developed to deal with this issue. Coolant foam is more an issue of an anti-foaming agent in the coolant itself.