Dillon Precision Big-Fifty - Manual (Page 12)

PART# 29023 3/8/2010
12
Dillon 50 BMG Case Trimmer
TO
OPERATE: You will need a pair of calipers to set the trim die properly. THIS DIE IS NOT
DESIGNED TO SIZE THE CASE AS IT HOLDS THE CASE NECK ONLY. For best results you need to
clean, size, and lube your brass before trimming. Place a clean, sized, and lubed case
into the station for the trimmer and raise the platform. Install the trim die (without the trim
motor) into the Toolhead on your reloading machine. Adjust it down until it is in full
contact with the case. If you screw the die down too far or all the way, without checking,
YOU MAY INADVERTENTLY PUSH THE CASE SHOULDER BACK. Once the trim die is adjusted
correctly, tighten the size/trim die lock nut. You should always have a case in the trim die
before beginning trim adjustments. You need to do this to avoid screwing the motor
assembly down too far causing the carbide cutter to contact the bottom of the port
window of the size/trim die. This will cause the carbide cutter to shatter, possibly causing
injury to nearby persons or damage to the unit. So with a case in the die, thread the trim
motor onto the size/trim die until the cutter makes contact with the case mouth. Then
lower the platform and turn the cutter motor down another 1/8 turn. Lock motor jam nut.
Connect the power cords and turn the motor on. Trim a case and check it for overall
length using a pair of calipers. To check for overall length, set the case firmly into the case
gage and set the gage on a clean, flat surface. The case mouth should be between the
high and low step of the case gage. Adjust the motor up or down and repeat these steps
until the right overall length is achieved. Once the right length is reached, lock the motor
jam nut. Before turning the unit on, always retighten the motor jam nut.
NOTE: The vacuum assembly clamps around the lower bell of the trimmer motor
assembly. It should surround the chip exhaust port on the trim die. The vacuum
attachment may need to be modified to fit your vacuum cleaner model.