trying to chamfer with a set distance on a rectangle!

[Hogfan]

Not sure how to ask this question, Here goes= If i have a rectangle that is 27.125 X 27.5 and i want to chamfer a corner, but i also have a set distance(or the hypotenuse) Which is 22. How can i get it to put that angle in there with out trial & error of drawing a 22" long line on a 45 degree angle and moving it till it fits properly, then trimming off the corners... I have tried all the different commands in chamfer, the best i can do is guess at the distance,which is a crap shoot to me.. Can someone make this easier!! Sorry i have tried the AC Help and all but to no avail... AC08 is what im using by the way. thanks in advance..

[JD Mather]

I'm sure there are many ways, but one way

draw horizontal line lenght 22 across part of the rectangle

click end grip to make hot

right mouse button and rotate 45 or -45

right mouse button grip again and Move to tracked intersection with first line

select second endpoint of line and right mouse button Move to second tracked intersection.

 

If you were using a later release you could simply use parameters and change the geometry to whatever you want.

Edited June 11, 2012 by JD Mather

[Blackfish]

I don't know if it's easier than drawing 45 degrees lines at the corner, but you can use transparent command 'CAL (calculator) inside CHAMFER.

 

In your case; written below as a macro, but you can type it in command line as 'normal' commands, just press 'enter' where semi-colons are and select two ends of lines you want to chamfer where backslashes are:

^C^C_CHAMFER;D;'CAL;(22^2/2)^.5;;\\

 

The above expression calculates a side (a) of isosceles triangle with a known diagonal (b=22): a=(c^2/2)^0.5

Edited June 11, 2012 by Blackfish

[nestly]

I would do what JD said, although I since I keep 45degree Polar Tracking and Intersection OSnap running, there are a few less steps.

[BIGAL]

Bit easier maths a line at 45 for square corner is 2^0.5 so use 1.414213562 ~ 1.4142 chamfer is L/1.4142

[JD Mather]

The geometry solution doesn't use any math calculations and the distances are geometrically perfect - no approximation on decimal places (other than the limits of the software).

[Hogfan]

I got it to work doing what Nestly did a post or two above!! I am not that familiar with making command prompts and such. I have done a couple in the past, but it was alot of trial and error, as i dont do that type of stuff enough to just go into toolbars and make new commands, I would like to do the transparent command if that is any good. Right now im going to try the one JD has suggested, the problem looks to be as i dont know exactly where it needs to sit on the corner, because i need the distance to be 22. Well keep working on it though, thanks to all....

[Blackfish]

As you said nestly's solutions is the easiest and the animation clear enough. What is your problem with 'where it needs to sit on the corner'? Follow nestly's gif and it'll be fine.

[nestly]

The animation I posted above really only varies from JD's description in that I started with the line already at 45 degrees. Here is another one following JD's instructions more closely.

[KrazyMann225]

You could do it like Blackfish said without creating a custom command

type Chamfer -> enter

D (for distance) -> enter

'cal (for calculator transparent) ->enter

22/sqrt(2) (math, see below)->enter, then enter again to set the same length for other side

proceed like normal

 

math

 

a^2+b^2 = c^2 a=b

a^2+a^2 = c^2

2(a^2) = c^2

2(a^2) = 22^2

sqrt[2(a^2)]= 22

sqrt(2) a = 22

a =22/sqrt(2)

 

Edit: I didn't proof read and i meant without creating a custom command. Sorry for any confusion that is a result of this error

Edited June 13, 2012 by KrazyMann225
messed up my math

[KrazyMann225]

Personally I would do it the way the two visual examples do it, but it can be done the way i jsut posted if you feel it is more precise (which it isn't imo)

[KrazyMann225]

Also if you are looking to be able to do this trim multiple times (hence you wanting it not to be trial and error) you could do it once trial and error but before trimming evoke the chamfer command, choose "distance", measure the distance from the corner to the "new corner", now you have the parameters set for the chamfer without having to use transparent calculator.

 

I'm not sure how many ways you want to skin this cat tho LoL

[BIGAL]

Getting away from true 90 a simple lisp pick line1 line2 enter length done! The triangle is a simple math formula two equal sides, it always seems you do something square and then the next guy to use goes the lines are not square ?

 

Me drag over two lines enter length done. Can help you start if you want to go the lisp.