Page 178 - Parlec Catalog

Tapping Selection

176 Tapping Solutions

Synchronous
With the advent of 32 bit microprocessors, modern machine tools have the capability of synchronizing the
spindle rotation and spindle feed. This has made it possible to eliminate the spring compression and tension
stroke utilized in traditional tapping heads. The advantage that this brings to threading is the speed the cycle
can operate. The cost of building tapping heads has also been reduced by the elimination of the axial float
mechanism.

Radial float is still a very important component of your threading operation. The absence of radial float will
restrict the tap’s ability to follow the drilled hole. The lack of radial float will force the tap to flex to meet the
hole, or to cut like a mill, causing premature tap wear.

Parlec offers many solutions for synchronous tapping cycles. We recommend the use of our tension only
tapping heads. This system will allow the tap to hard start, has radial float, a tension stroke to compensate
for any spindle over rotation, and quick change of tap adapters. Any Parlec TA style tapping head can be
adjusted or purchased as a tension only (TT). Parlec offers TR (tapping rigid) or FS (fixed shank) tapping
heads in all of our non-torque controlled systems. These units have no tension or compression stroke but do
offer radial float and quick change tap adapters. In addition, Parlec offers ER style tap collets with no float,
and with tension and float. These are available to use with standard ER collet chucks and with ER tap collet
adapters. (Use with a NUMERTAP collet adapter provides radial float).
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Tension & Compression
Tension and compression tapping heads have been the main stay of machine tool tapping for many years.
Parlec offers a wide range and style of these heads. We offer the widely used BILZ-style as well as the rugged
NUMERTAP systems. Identified as (TA) in the part number.
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Torque Control

Torque control tapping is still the best solution for protecting your taps and work pieces from tap breakage.
Bottom tapping or close blind hole tapping where chip evacuation is a concern, are prime operations
for torque control tapping. Parlec offers torque control tapping from #4 through 1”. Refer to the
following pages for more detailed information: NUMERTAP 80, 700 and BILZ-style 1,2, and 3 with
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torque-controlled adapters.

Rigid
ER tap collets are available for use with NUMERTAP adapters as well as with standard collet chucks. Loss of
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radial float will result with use in standard collet chucks. Poor tap life and thread quality may result. Parlec
tapping units are also available as rigid or fixed shank units (TR, FS). These units provide radial float and
quick-change adapters but are rigid in the axial stroke. Unlike standard collet chuck systems, they will still
yield the benefits of quick change and radial float.

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