Do you have the material hardness ?
What do the chips come of like
If you can advise i can make some suggestions for the correct type of drill
If you have vibration or a poor set with the Dremel don`t use carbide
Hi Dominic
You have got an engraving machine with a low RPM motor
If you consider 200 m/min for Ali the calculations show you should be running 26,600 RPM
Switch to HSS 8% cobalt uncoated
carbide is not required