Page 255 - Parlec Catalog

Manufacturing Specifications

Quality Specifications 253

Tapers
Parlec tapered toolholder shanks are manufactured in accordance with ASME B5.50 - 2009 (Per ISO-1947).

ƒ Angle deviations are allowed only in the direction that ƒ Additionally, the placement of the grade level lines
increases the rate of taper. represent the allowable angle tolerance
deviation at Parlec’s taper gage contact lengths.
ƒ The attached histograms illustrate the results of
measurements taken on Parlec manufactured tapered ƒ Based upon the observed manufacturing
toolholder shanks. These represent typical process variation and the location of the process
manufacturing process output results. averages, as illustrated in the histograms, the following
process performance can be summarized:
ƒ The horizontal axis of each histogram represents cone
angle deviations from 3.500" nominal.

PROCESS PERFORMANCE

Type % of Toolholders Meeting (Cumulative %) Actual Deviation from 3.5" Per Foot
#40 AT-1 = 10 ≤ .000034
AT-2 = 62 ≤ .000053
AT-3 = 99.9 ≤ .000085
#50 AT-1 = 31 ≤ .000051
AT-2 = 83 ≤ .000069
AT-3 = 99.9 ≤ .000109

Histogram – Rate of Taper Measurements Histogram – Rate of Taper Measurements
40 Tapers 50 Tapers

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