Operating Instructions: Twin Cutter

Installing Insert Holders:

• Remove the two insert holder clamps and set aside.
• Place the insert holders in the head, making sure the slot in the bottom of the insert holder engages the head of the diameter adjusting screw.
• Install the insert holder clamps (cap screw on size two). Make sure that the nut is flush with the end of the screw.
• Snug up the insert holder clamps.
  
  

It is recommended that the Parlec twin boring heads be adjusted on a tool presetter. Refer to Parlec Parsetter catalogs for more information.

Adjusting for Balanced Cutting:

Balanced cutting allows both cutting edges to work simultaneously. A properly balanced twin cutter may be fed at almost four times the rate of a single cutter. Make sure the height cam is located with the reference mark (lowest point) in the vertical position as shown.

• Loosen the insert holder clamps. Re-tighten enough to put drag on the insert holder.
• Adjust the diameter by turning the adjusting screw. Always adjust in the clockwise direction.
• Tighten the insert holder clamps.
• Repeat for the second insert holder, adjusting both to ± .001 on the diameter.
  
  

Adjusting for Stepped Cutting:

Stepped cutting allows removal of more metal since each insert is set at a different diameter.

• Make sure the height cam is located with the reference mark in the vertical position as shown.
• Loosen the insert holder clamps. Re-tighten enough to put drag on the insert holder.
• Adjust the diameter by turning the adjusting screw. Always adjust in the clockwise direction. Set the diameter of each insert to remove approximately one half the material.
• Using the cam screw, adjust the inner cutting edge so that it has a lead over the outer cutting edge. This lead should be a minimum of 11/2 times the feed per revolution.
• Tighten the insert holder clamps.
  
  

NOTE: When using stepped cutting, the feed rate must be that of a single cutter.