The angles on the face of the drill are fairly critical, as they will change. There may be spots rubbing the
drill because lack of clearance, may cut curved holes, or may turn out ribbon chips. These problems can
be usually be traced to an improperly sharpened drill. You shouldn't have any trouble on the drilling if you
have followed instructions. By now, you will have probably noticed that as the pressure of the oil goes,
so does the temperature.
On small calibers the drill tubing gets very warm. This is normal. By now, you should be about all the way
through the barrel. When the drill comes through the end of the barrel, your flow of oil in the chip box will
stop abruptly. Open the valve on the bypass line to drop the oil pressure. Let the drill travel about another
1/4 inch and disengage the feed lever and back out the drill, when it all the way out shut everything down.
Well you have done it. You have drilled your first barrel. The rest should be easy now. If everything was
done right, the barrel should be perfectly straight. Leave the barrel in the lathe, as the next operation will
be reaming the drilled barrel.