![]() Because core pins have a draft or are slightly tapered the theoretical hole size should be at a point on the pin that is one-half the required length of engagement of the thread to be formed. Tapping Cored Holes Possible: Cored holes may be tapped with these taps provided the core pins are first changed to form the proper hole size. For this reason it is best to countersink or chamfer the hole prior to tapping, so that the extrusion will raise within the countersink and not interfere with the mating part. Generally, the tap extrudes with greater efficiency at higher RPMs but it is also possible to run the tap at lower speeds with satisfactory results.Ĭounter Sinking or Chamfering Helpful: Because these taps displace metal, some metal will be displaced above the mouth of the hole during tapping. Spindle Speeds: For most materials, spindle speeds may be increased over those recommended for conventional cutting type taps. ![]() We recommend MQL Systems Dry-Cut Cutting Fluid. Standard Lubrication: In general it is best to use a good cutting oil or lubricant rather than a coolant for cold forming taps. It is unnecessary to have lead screw tapping equipment in order to run the cold forming tap because the tool will pick up its own lead upon entering the hole. No Lead Screw Necessary: These taps work equally well when used in a standard tapping head, automatic screw machine, or lead screw tapper. On most applications, therefore, conventional equipment is suitable for driving cold forming taps. Torque: Where the operation calls for 75% of thread or less, the torque required varies with the material from no additional torque to 50% additional torque. These tools, with four threads of taper, will require less torque, will produce less burr upon entering the hole, and will give greater life.
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