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Check list for good tapping<br />
Tapping is a specialized field with unique <strong>ch</strong>allenges and tapping te<strong>ch</strong>nology <strong>ch</strong>anges<br />
continuously but the basics necessary for good tapping remain the same. For the best results,<br />
the key areas to analyze are the work piece, the tap, the ma<strong>ch</strong>ine tool, the tapping atta<strong>ch</strong>ment or<br />
tap <strong>ch</strong>uck and the set up.<br />
Work piece:<br />
n Is the core hole drilled to the correct size?<br />
n Will it be a through or a blind hole?<br />
n If tapping a blind hole, does drilled depth allow sufficient <strong>ch</strong>ip clearance to keep tap from<br />
bottoming out in hole?<br />
n Is the work piece rigidly held against rotation and upward movement?<br />
n What is the material and hardness of the work piece?<br />
Tap:<br />
n Do you have the correct tap design for the application?<br />
n What are the tap size and style?<br />
n What material is the tap made from? Is the tap sharp?<br />
n Is the tap properly aligned with the drilled hole?<br />
n Is there sufficient clearance between the tap and the hole to allow for retraction?<br />
n Who is the tap manufacturer? What speed does he recommend for optimum performance<br />
of his tap in this material?<br />
Ma<strong>ch</strong>ine tool:<br />
n Is ma<strong>ch</strong>ine stop set so the tap releases in neutral to prevent bottoming?<br />
n Is the ma<strong>ch</strong>ine retraction correct for the tapping atta<strong>ch</strong>ment being used?<br />
n Is the torque control set to prevent tap breakage?<br />
n What type of ma<strong>ch</strong>ine is in use, what is the horse power and the spindle taper?<br />
n Is the work piece rigidly held to prevent displacing due to the high torque when tapping?<br />
n Are ma<strong>ch</strong>ine feed and speed set correctly?<br />
n Is the proper cutting fluid being used for lubricating the tap?<br />
Tapping atta<strong>ch</strong>ment:<br />
n Is the correct TAPMATIC tapping atta<strong>ch</strong>ment or tap <strong>ch</strong>uck being used for the specific job<br />
requirements?<br />
n Is ma<strong>ch</strong>ine retraction correct for the tapping atta<strong>ch</strong>ment being used?<br />
n Never perform any installation or programming, before reading the operator instructions for<br />
the tapping atta<strong>ch</strong>ment and the ma<strong>ch</strong>ine as well as the tap manufacturer’s recommendations.<br />
Installation:<br />
n With a self-reversing tap <strong>ch</strong>uck for manual or CNC operations, it is important to make sure that<br />
stop arm is strong enough to prevent torque bar from bending or deflecting. Ma<strong>ch</strong>ine torque<br />
bar must be stronger than largest tap.<br />
n If a torque control atta<strong>ch</strong>ment is being used, is torque set correctly so that tap will not break if<br />
accidentally bottomed?<br />
n If depth control feature is employed, is it set correctly to cooperate with ma<strong>ch</strong>ine stop, provide<br />
total thread depth required and prevent engagement with bottom?<br />
n Is clearance between the drilled hole and tap sufficient at start position to allow the tap to<br />
clear the hole upon retraction?<br />
n Is the stop dwell disengaged or at least set to a minimum?<br />
Never hold the stop arm<br />
by hand: risk of injury.<br />
Do not lengthen the stop<br />
arm, it could break off.<br />
Do wear protective<br />
goggles. Do not wear<br />
loose clothes close by<br />
rotating spindles.<br />
Do not hold the work piece<br />
or vice by hand, they must<br />
be clamped.<br />
TAPMATIC 35
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