제11 장. 기하공차 - dasan.sejong.ac.kr

1 11 . - : (dimension) : (geometry) - : , , (geometry) ( ) , , .. 11-1 - .- , , , , . , mm , mm .. 11-2 - - (b) , 140 100 H6/h5 H6/h5 - / ( ) , - , .- 1 A 100 - A 100mm.

2 A 100mm . A .- A ..- A .. 2 0 003 001 - A . 2 . A , . A . A , . 11-4 11-4 ..- 0003 A . A .. 11-3 / - /.

3 , , , .- - , . 11-4 11-5 (straightness) ( ) - ( ) -( 11-9) , 2 -( 11-10) 50 mm 11-6 (flatness) - - , . 2 2 . , 11-7 (roundness) (t i l ) ( ) - (true circle) ( ) - , 2 . - , 2 . 11-8 (cylindricity).

4 - . - , 2 . 11-9 (profile) ( ) ( )- (or ) (or ) 11-10 (parallelism) 2 -2 . -2 , 1 . (datum) - (datum) . ( A) 20 A 003mm D t A Datum A 11-11 (perpendicularity) 2 -2 .- .- 90 ( ) 11-12 (angularity) - ( ) . 11-13 (true position) - , .- 11-24 A 60 mm, B 100 mm 003mm mm.

5 1126() A - 11-26(a) A , B 85 mm, C 100 mm , A mm .- 11-26 (b) 8 15H7 30 mm 008mm . 11-14 (concentricity) - .. A-B mm . 11-15 (symmetry) - - , A 2 ( )( )- ( ) 11-16 (run-out) - (run-out) .. - . Example ? 1 ( 1 A A )CNC Example ?CNC 3 2 4.

6 , ( 4 B B )