Page 254 - Parlec Catalog

Manufacturing Specifications

252 Quality Specifications

Material and heat treat: FEATURE END:

All tapered products are manufactured from 8620 alloy Taper-to-Eeature End runout is critical to any precision
steel. 8620 steel is the ANSI standard for retention knobs machining operation. The lower the feed rate the more
because of its good core strength and its long wear life. runout will effect performance. Toolholders intended for the
Tapered shanks are case hardened to Rc: 56-60 or Rc: 52-56 highest speeds need to have the taper to second end feature
and have a core of Rc: 35-40. The case hardness is designed ground to the closest obtainable concentricity.
to give maximum wear life without compromising the Rc: 60- The ERos® system has less than .00004” or 1 micron of
62 spindle. Retention knobs are case hardened to Rc: 56-60 runout gaged from taper to collet seat. A Shrink Fit tool has
with a core of Rc: 35-40. a gage tolerance of .0001” or 2.5 microns. Production gage

All tapered products are manufactured from 8620 alloy toolholders such as an end mill holder or shell mill holder
steel. 8620 steel is the ANSI standard for retention knobs have a gage tolerance of .0002” or 5 microns of runout
because of its good core strength and its long wear life. between taper and second end ID or OD.
Tapered shanks are case hardened to Rc: 56-60 or Rc: 52-56 ID bore tolerance is nominal +.0002” /- .0001” and OD feature
and have a core of Rc: 35-40. The case hardness is designed tolerance is nominal +.0000”/-.0002”.
to give maximum wear life without compromising the Rc: 60- Diameters are held to a nominal +.0002"/- .0001" on the
62 spindle. Retention knobs are case hardened to Rc: 56-60 inner diameters and +.0000/-.0002" on all OD features. All
with a core of Rc: 35-40. features are ground in a taper pot chuck to insure close
HSK products are made of a superior high strength alloy that runout specifications between taper and the feature. All end
prevents fractures on the taper caused by the compression mill holder ID’s are air gauged and all diameters under 3/8"
and expansion of the hollow taper. are diamond honed to avoid barreling at the cross hole.

Shrink Fit Toolholders are manufactured from H13 or
equivalent material. This ensures long continuous service,
heating cycle after heating cycle.

MANUFACTURING SPECIFICATIONS

Features Size Tolerance TIR
Taper Type ≤ AT3 NA
Taper Roundness ≤ .00008 NA
End Mill/Collet Seat + .0001/- .0001 ≤ .0002
Shell Mill Pilot + .0000/- .0002 ≤ .0002
PC Connection Small + .0002/- .0000 ≤ .0002
PC Connection Large + .0003/- .0000 ≤ .0002
PC Face NA .0001
Power Milling Chuck + .0002/- .0000 ≤ .0002
Heat Shrink + .0002 ≤ .0001

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