Начертательная геометрия

11. ' % '

231

! " "D %#$ 2.402-68 %#$ 2.406-76. C - " : , - ()) . =. / " D , ( D -. @ ' D ' D , D , , ( , ) ( . 11.13). / , +-+ .

= . 11.13

, D' -" ( , -. C " d1=mxq, " q – ! , D' ," . Imx ()) q %#$ 214493. ? " p1 – ( )D' " .

232

.

/ "$ , q " * ! mx

" : ha=mx.: hf=1,2mx.

: " ( . 11.14) " D ) . I " , -" 2f 90...120°.

, , D" : ) .

@ " ( . 11.14) ) , D D' D , ( .

= . 11.14

11. ' % '

233

" " () " ) - D ". ( " . # ( "D .

@ " D -" – D + D - + . # D .

11.6. -" =$# %

= D . = " , , -' + – + , . . ' -, – .

= ' ". = ", .

I D D ) " + 40 . ? " + " " .

= D %#$ 2.404-75 ( . 11.15).

@ D ) . <-+ , , + -, +-, – +-. " .

11.7. # * # )-

D + , , , , - +-. .

,( . 11.6, ). ' " "' D . D + , D' - . ! ,. -%#$ 2.408-68.

234

.

=. 11.16

=. 11.15

11. ' % '

235

@ D :

+ ;

" ;

+ " " ;

;

" " ;

;

, D' D .

D , "( . 11.16).

11.8. #" "0 : , %=:

A ' ' -. ;

	,		: " (-
			) ( . 11.17).
			C " >-
			D
			" ) (-
			) " D '
			( ), '
			"
= . 11.17			' D .
			= , D'

' , " ," = 12…15°. ( " " -, ( - . !" , D 55…60°.

A – -=p/*, " p – + " " ( -+ ).

= D D' + .D ) h=(0,75 ... 1,0) m. C + da=m z, " z— . C df=da—2h.

@ " D– ; + - .

236

.

11.9. >/% (

# – -+ ' " ) .

: , , . * D : , ) ; ( " D' " (- , ); ( , )- ); ' , .

" D ( . 11.18), , ; ) –( , ) ( ), -) ; ( ); ( ); ( ); ( ) " .

" ( , , , ),( ), " ( , ).

D .

%#$ 2.401-68 .

@ D , - , ( ) -, D , -D .

D -.

" D " .

. 11.19 ( ) . 11.20 ( ).

D , . . , + .

C D -( ¾ , + ) D ¾ ). ( , -, 2 1,5 ,.

@ , D' 1,5 ( . 11.21, ).

11. ' %		'	237
	= . 11.18
= D D' -
: d, D, + " t
n. " , -
0.5. / ,			1,5 ,
" :
	( ) H0=nt+d;
	n1=n+1,5.
& " ,
" D , -
. # D , -
( 11.19,
. 11.20).

238

.

=. 11.20

=. 11.19

11. ' % '

239

, (+ ",) - + , .

! , ( , -6 ), " , )

" , (( . 11.19, . 11.20).

,D , D, D + " t, d.

@ . 11.21, -

.

= . 11.21

B ( D ) - D .

C ( ) H0=d(n+1), " n – -. C ( . 11.19) -:

H 0 =H0+2(D – d),

" D – ; d – . = "

R " D . 2d .

2

= +D/3.

@ ( D ) - D , -.

240

.

n, – n1.

@ - D - .

/ " > - + D , -' D " , D -" ) ( ).

C :

:

L ) n1 /* (D d)02 . l 2 .

- ;

:

L ) * (D d)(n . 2) .

"# "&( ) * & :"+" " *

1.& D + ?

2.& -?

3.& D

?

4.& + " " ?

5." ?

6." "

?

7.D - " " ?

8.& " " ?

9.& ) D " -

?

10.D " " ?

11.& " ?

12.& ' D?