Начертательная геометрия
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211 |
@ . 10.46, " + , - " . 10.46, . * + - " , ( 9), ( " (%#$ 5264-80),+ (). ?
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= . 10.46 |
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& , + D ( . 10.47) : ) ( – 1, – 2,…); ) ( @ – 1, @ – 2,…); ) " ( ! – 1, ! – 2,…); ") ($ – 1,$ – 2,…);
) D' ( – 1, – 2,…).
5 1 1 -5 % 2s ( . 10.47 10.48). @ –' D ( ), -. < D- D . # + 1 .
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= . 10.47
/ + , +D ( 3 – 5 ),.
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= . 10.48
D . B ,+ +- . ,, , .
D D +, + , D. I ( . 10.49).
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= . 10.49
# ' " ' -: 4 {9 – 102 8 '2 22345-77.
10. & |
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11
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11.1. & " ( #" * %*
I – ( , ' - , D D ' -" " . # " '- . I ) D :
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+ D 5, + – . & ', ' " .
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11.2. ?& " ( %="' / %* ) 0 =>'- (, # ) -
( – , -– ), " D' , -" , 1 5.
@ . 11.1 " " -( " - .
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= . 11.1
( ), D' -( '– " , 1 .
, , , -, , ' ( , D " " , %#$ 2.402-68.
@ . 11.2, ," .
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mt – , * + " + " pt, . . mt=pt /*. B m, .
+ " D -) " -" . C *d=zpt, " z – , pt = *d / z.
218 |
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# + ", , *, ( " " .
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= . 11.2 |
; -m = d/z - .
+ " -m, 1,25m.
C + da df
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da = d + 2m; |
df = d – 2,5m. |
( D -D D' + , ,.
C - " ( " ) " + " pt - " " + " pn ( – "" mn – , * + + " pn.
CD )
d " mn z , cos
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" D D' :
I , , - , D " - , " ' ( . 11.3).
C , ," " " ' D
11. ' % ' |
219 |
( . 11.3, ) D ( . 11.3, , , ). = " D ( . 11.3, ), , - , , -( . 11.3, ).
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= . 11.3
/ - -( ( , ) ), "- D (" ).
+ D' D + -D + ( . 11.3). $D D' D .
C D D' D -D + .( D " - D .
/ ' - " , ( -D . @ +-( . 11.3, ).
" , - ' D D D .
220 |
. |
@ , , -D' D + ( . 11.3, , ).
/ ) ,- ( – ). @ , " "" D -" ( . 11.3, , , ).
A D , -, + D D D -. " -.
= -%#$ 2.403-75 – %#$ 2.427-75. @ ' D . @, - D' .
@ , " " ( . 11.4) : + ; +-) "+ ; ) ( - ). & ( " , D -( ( , , ). $ -" . = " ) . 11.4.
$ " " -" ( D " " + ) D' " :– ( " ): –; – .
- D " . $, " " D
( . 11.7). &" ' D . -' D .
"" ".
$, , -.