ISO 4468 CORR 1 Gear hobs — Accuracy requirements TECHNICAL CORRIGENDUM 1
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ISO 4468 CORR 1 Document Information:
Title
Gear hobs — Accuracy requirements TECHNICAL CORRIGENDUM 1
International Organization for Standardization
Publication Date:
Nov 15, 2009
Scope:
This International Standard specifies requirements for the
accuracy of general-purpose hobs of 0,5 module to 40 module.
These hobs are intended for producing gears which conform to ISO
53 and ISO 54.
This International Standard applies to hobs for spur and helical
gears. It applies to solid (monobloc) and inserted blade hobs.
The elemental features of hobs are graded according to accuracy,
as follows:
— Grade 4A;
— Grade 3A;
— Grade 2A:
— Grade A;
— Grade B;
— Grade C;
— Grade D.
Grade 4A is the highest order of precision.
In addition to the elemental tests for hobs, this International
Standard gives permitted tolerances for composite tests that are
taken along the cutting edges on the line of action. The two groups
of tests are not equivalent and one shall choose between one or the
other. If there was no previous agreement, the hob is regarded as
belonging to the precision class specified if it satisfies one or
the other of the two methods of inspection.
NOTE The tolerances in this International Standard were
determined for gear hobs whose dimensions conform to ISO 2490, but
with certain precautions they can be applied to hobs not specified
in this International Standard.
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