Gear Machine Tooling

▸Hobs

Standard

ISO 2490:2007 covers general-purpose single-start solid hobs (module 0.5–40), with an axial keyway or face-key (tenon) drive, and specifies their nominal dimensions^[1]1 source · reference

Drive type

• Axial keyway Driven by a keyway (longitudinal key) in the bore
• Face key (tenon) Driven by face keys (cross drive)

^[1][2]Liebherr's hob arbor table lists applicable hob lengths separately for two systems: longitudinal drive and cross drive

Bore diameter series (by manufacturer)

• 19.05、22、25.4、27、31.75、32、38.1、40、50、60^[3]Ø32 interface: 19.05–40; Ø40: 22, 27, 32, 40, 50 (T2-045); SK-45: 60 (T2-047). Unit: mm. Includes inch sizes (19.05, 25.4, 31.75, 38.1)
• 60^[4]
• Bore diameter 6–50 mm, outside diameter 16–180 mm^[5]

Commonly used bore diameters

22、27、32、40、50^[2][3]1 source · referencemedium because both are pages from the same manufacturer (Liebherr). The text of JIS B 4354 and the DIN series tables could not be checked

Accuracy

Accuracy grades: DIN 3968 (AA, A, etc.)^[5][6]

Accuracy (JIS)

JIS B 4355:1998 grades AA, A, B and C^[6]1 source · referenceNidec writes "JIS4355-1998"

Shank-type hobs

Besides bore-type hobs there are shank-type hobs^[5][7][6]

Shank mounting

—Not confirmed in public sourcesNo public source was found that gives a standard for shank hob shank shapes (cylindrical, taper, HSK, etc.)

▸Hob arbors

Machine-side mounting (by manufacturer)

• • HSK-C80 (bore 22–60)
  • SK-A45 (22–60)
  • SK-45 (60)
  • Cylindrical Ø32 (19.05–50)
  • Cylindrical Ø40 (22–50)
  ^[8]The far end is supported by a counter bearing (designations such as WZL250). Overall length 320–500 mm

Standard

—Not confirmed in public sourcesThe contents of any JIS or DIN standard specifying hobbing machine arbors, centers and spindle ends could not be confirmed from public sources

▸Shaper cutters

Type

Disc type (disc), hub / deep counterbore type (hub / deep counterbore), shank type (shank)^{[7][9][10][11]}

Disc-type bore diameters

• 1.25in 31.75
• 1.75in 44.45

^[10][12][9]Liebherr gives 31.74 for DIN 5480. Many examples are 31.75 for pitch circle diameters of about 70–76 mm and 44.45 for about 100–125 mm (Liebherr stock table)

Hub-type bore diameters (by manufacturer)

• 19、31.75、44.45^[11]
• List of bore diameters including 19.05 (below)^[9]

List of bore diameters (Nidec)

12.7、16、19.05、22、25.4、31.75、32、44、45、58.7375、63.5、70、88.9、101.6^[9]1 source · referenceNidec's manufacturing range. '44, 45' may be a typo for 44.45; recorded as is

Shank type

For shank type it states 'QAL upto 160mm' (likely an upper limit on overall length, but the source does not explain the abbreviation)^[9]1 source · reference

Shank specifications

—Not confirmed in public sourcesNo public source confirms the shank standard (Morse taper, etc.) for shank-type pinion cutters

▸Shaving cutters

Bore diameter

44.45、63.5、100^[13]1 source · referenceNidec's manufacturing range (PCD 150–350 mm, module 1.25–14)

Machine examples

Nidec FE series shaving machine: cutter bore ⌀63.5^[14]1 source · referenceNot rated high because it belongs to the same Nidec group as T2-055

▸Related standards