harrison'sblog

drawing on auto cad

At the last time in my class, i have been drawing some parts on auto cad, they were center board and rudder, at the beginning, i had times to measure dimensions of them.

by the way, chris sad that that parts you didn't measure it can be guessed by me, it is work.

thus, i had to submit it to chris after i printed it, i was missing some mistakes of the putting radious and names on each parts.

this picture is which i sketched

 

this picture is which i have to fix in the next time

 

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temporary frames and lines plan

few things about what we gonna do in the next time in the class

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Lines plan, i have done a little bit about this.

it is almost same with what i have done before on the card board

i have drawn lines on this, when i do this, and i used battens and ducks to draw lines here

i use ducks to hold battens when i draw curves on this, but it is important that i have to check if the line is fair or not

, when doing this, i checked many times. when it is not fair, i must doubt the point which i did, because of it must have correct line and fair when it is put on correct points

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by auto cad

I drew Tool box and oil stone box by auto cad in class

actually picture 1 and 2 about blue print of the tool box and oil stone is same picture, I seperated it, and the right side picture3 is which i described the tool box as 3dimension. 

the rectangular shape with two diagonal lines in the picture in the middle side have a role when making a tool box as both sides in it, which means i have to cut the two lines and make the shape in the right side of the rectangular shape

when making the shape in the last picture, i translated the distances in picture 1, 2 into it as it is, and to keep parallel from sides to opposit sides, i need to keep fixed angle when i draw it, i did 30 degrees

these 3pictures are drawn by me.

yesterday i learned how to make the camber, there are few ways to make it,

i know one way only, i made this camber by that way

I used trim to cut half of the circle and divided the half-circle as 8pieces by using command "divide" it help to divide it as equal parts.

the horizontal line also need to divide as 4pieces and each points has lines to intersect with the lines starting from the 3points of the circle, i have to make every lines intersected then mark 3points to draw the curved line by using command "spline"

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it would be used like this 

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i made this by auto cad which i did also in the card board 

in this way, i can do this easier than doing by hand

i have to make perpendicular with buttock 50, and measure the angle between them by angular.

and fix the angle to be 90 degrees by rotate. then it can be drawn.