Erecting and Dropping offsets Second 1 Dropping perpendiculars

Erecting and Dropping offsets Second 1 ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ Dropping perpendiculars Radios methods AB is the base line ﻃﺮﻳﻘﺔ ﻧﺼﻒ ﺍﻟﻘﻄﺮ 1 - C is the point that we want drop offset from it 1 - By tape we draw arc from point C and this arc intersection with AB in point D and E E , D ﻓﻲ AB ﻳﺘﻘﺎﻃﻊ ﻣﻊ C ﻧﺮﺳﻢ ﻗﻮﺱ ﻣﻦ ﺍﻟﻨﻘﻄﺔ C 2 - We measure distance ED and mid the distance fixing the point F F ﻓﻲ ED ﻧﻨﺼﻒ ﺍﻟﻤﺴﺎﻓﺔ A D CF is the offset was Drop on the base line From C ﻫﻮ ﺍﻟﻌﻤﻮﺩ ﺍﻟﻨﺎﺯﻝ ﻣﻦ CF ﻋﻠﻰ ﺧﻂ ﺍﻟﻘﺎﻋﺪﺓ C ﺍﻟﻨﻘﻄﺔ F E B

Erecting and Dropping offsets Firstly 2 ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ Dropping perpendiculars Shortest distance AB is the base line ﻃﺮﻳﻘﺔ ﺃﻘﺼﺮ ﻣﺴﺎﻓﺔ 2 - C is the point that we want drop offset from it 1 - By tape we draw arc from point C and this arc intersection with AB in a lots of point C ﻓﻲ ﻛﺜﻴﺮ ﻣﻦ ﺍﻟﻨﻘﺎﻁ AB ﻭﻫﺬﺍ ﺍﻟﻘﻮﺱ ﻳﺘﻘﺎﻃﻊ ﻣﻊ C ﺑﻮﺍﺳﻄﺔ ﺍﻟﺸﺮﻳﻂ ﻧﺮﺳﻢ ﻗﻮﺱ ﻣﻦ ﺍﻟﻨﻘﻄﺔ 2 - We write all distance at intersection point ﻧﺴﺠﻞ ﺟﻤﻴﻊ ﺍﻟﻘﺮﺍﺀﺍﺕ ﻋﻨﺪ ﻧﻘﺎﻁ ﺍﻟﺘﻘﺎﻃﻊ 2 - The shortest distance is the CF A CF ﻧﺤﺪﺩ ﺍﻗﺼﺮ ﻣﺴﺎﻓﺔ ﻭﻫﻲ CF is the offset was Drop on the base line from C ﻫﻮ ﺍﻟﻌﻤﻮﺩ ﺍﻟﻨﺎﺯﻝ ﻣﻦ CF ﻋﻠﻰ ﺧﻂ ﺍﻟﻘﺎﻋﺪﺓ C ﺍﻟﻨﻘﻄﺔ F B

Erecting and Dropping offsets Firstly 3 ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ Dropping perpendiculars Engineering methods AB is the base line ﺍﻟﻄﺮﻳﻘﺔ ﺍﻟﻬﻨﺪﺳﻴﺔ 3 - C is the point that we want drop offset from it 1 - We choose a point in the base line that is equal to 3 meters ( D ) D ﻣﺘﺮ ﻭﻟﺘﻜﻦ 3 ﻧﺨﺘﺎﺭ ﻧﻘﻄﺔ ﻋﻠﻰ ﺧﻂ ﺍﻟﻘﺎﻋﺪﺓ ﻭﺑﻤﺴﺎﻓﺔ 2 -Measured the distance CD and mid the distance and fixing the point E E ﻭﻧﻨﺼﻔﻬﺎ ﻓﻲ ﺍﻟﻨﻘﻄﺔ CD ﻧﻘﻴﺲ ﺍﻟﻤﺴﺎﻓﺔ 3 - Along the ED we draw an arc to intersect with the AB in F F ﻓﻲ AB ﻧﺮﺳﻢ ﻗﻮﺱ ﻳﺘﻘﺎﻃﻊ ﻣﻊ ED ﺑﻄﻮﻝ FC is the offset was Drop on the base line from C A C E D ﻫﻮ ﺍﻟﻌﻤﻮﺩ ﺍﻟﻨﺎﺯﻝ ﻣﻦ CF ﻋﻠﻰ ﺧﻂ ﺍﻟﻘﺎﻋﺪﺓ C ﺍﻟﻨﻘﻄﺔ F B

Erecting and Dropping offsets Firstly 4 ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ Dropping perpendiculars Formula methods AB is the base line ﻃﺮﻳﻘﺔ ﺍﻟﻘﺎﻧﻮﻥ 4 - C is the point that we want drop offset from it 1 - We choose a point in the base line that is equal to any distance ( D ) C 2 -Measured the distance CD 3 - Along the CD we measured a distance on base line and fixing the point E 3 - Compute the projection to point C by FE = ( CE)² / 2 DE to fixing the point F CE is the offset was drop on the base line from C A D F E B

Erecting and Dropping offsets Firstly 3 ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ Dropping perpendiculars There is an obstacle AB is the base line C is the point that we want drop offset from it 1 - We choose tow point in the base line ( E and F) C 2 -From point E we drop the offset EG on CF River 3 - From point F we drop the offset FH on CE G 4 - The offsets intersection in K 3 - From point K we drop the offset on AB CZis the offset was drop on the base line from C K H B A F Z E

Erecting and Dropping offsets Home Work ﺍﻷﻌﻤﺪﺓ ﺃﻘﺎﻣﺔ ﻭﺃﺴﻘﺎﻁ