Acceptance Conditions and Tolerance Grades

Acceptance Conditions and Tolerance Grades:

		Standard tolerance grades
		Standard tests and tolerance

S T A N D A R D T O L E R A N C E G R A D E S

The WPC Standard Tolerance Grades are the same used in ISO 3408-3, including technical acceptance conditions, definitions and acceptance tests.

ISO 1

ISO 3

ISO 5

ISO 7

ISO 10

Application grade recommendation

- Coordinates/ measuring machines

- Grinding machines

- JIG borers

- CNC lathes

- Milling machines

- Boring machines

- Vertical lathes

- Drilling machines

- Laser cutting machines

- Robots

- Transfer lines

- Wood working machines

- Robots

- Linear actuators

- Aircraft applications

- Power steering

- Valves actuators

S T A N D A R D T E S T S A N D T O L E R A N C E

The geometrical tests (travel deviations and run out & location deviations) are performed in respect of the ISO 3408-3 recommendations in special environmental WPC laboratory. For different tests, please contact our Engineering Department.
Travel Deviations per reference length	Type of ball screw
	P	T
	Test code
Tolerance on Specified Travel (e_p)	E.1.1	E.1.2
Permissible travel variation (v_up) within Useful Travel	E2	-
Permissible travel variation (v_300p) within 300mm travel	E3	E3
Permissible travel variation (v_2πp) within 2πrad travel	E4	-
Travel compensation (c) for useful travel (l_u)	Specified by user	c=0

Note: - All definitions are presented in chapter F.

- The test and tolerances refer to the ball nut body displacement relative to
the ball screw shaft.

- The measuring intervals (mm) are presented in the table D2.

- If the user doesn't specify the travel compensation, WPC will manufacture
the ball screw using data for most usual machine tools applications.