How to draw this in D Cad - bores in rod at 45 deg in relation to each other

[bhill]

Hi,

I am trying to draw a cylindrical rod with two through holes in the rod.  In other words, looking at the side of the rod, there will be two through holes bored through the rod and the center lines of the through holes, will intersect and be perpendicular to the centerline of the rod.  The holes will not intersect and will be about an inch or so apart.

The problem I am having in trying to figure out how to do this, is that the two holes will both be bored at 45 degree angles in relation to each other.  In other words, looking at an x ray view at the rod end, the two bores will form a cross.  Which means the lengthwise view of the rod - in order to be portrayed correctly - the holes will need to appear slightly elliptical and off center from the rod centerline.  So I guess in order to project, I need to determine the lenght of the minor axis of the ellipse.

How would draw these in DC - or how would I determine using DC tools the shape of the ellipse of the holes given that the holes will be at 45 degrees in relation to each other, in other words, along the centerline of the rod, they will be off center from the rod centerline by 22.5 degrees...Is there an easy quick tool to do this on DC, or do I need to just to pull out my old college math books and re learn ellipse formulas & do the math?

Thanks for any advice. 

[SteveMS]

Something like this? Trhese holes are 90 apart.

You will have to go back to the old days I think.

[bhill]

No those holes of yours are 90 degrees apart not 45...

[SteveMS]

Give me 5 minutes.

[SteveMS]

Try this.

Oh, I have had to do this is a 3D package.

[SteveMS]

You could draw the plan view and then project back. I'll give it a go later today. What are your part sizes? Hole size etc etc and lengths?

[bhill]

Hi There,

Thanks so much, two different sizes -   one inch diamater rod with 1/2 inch diameter hole, and also half inch diameter rod with 1/4 diameter hole.

How did you come up with the ellipse in double cad - that is what I am really trying to figure out.  When you say draw it in plan view first is that what you mean?  Not sure how to proceed that way, I am working entirely in 2D...

[SteveMS]

Thanks for the sizes. I'll draw this up for you and you'll see how I did it. I will leave the constructions lines for you.

[SteveMS]

Try this example. My connecting lines are not a true curve yet as I am zooming through, but you can see how I have done it. I'll fix it up too. Now, I have drawn in metric, but the shaft is 1"(25.4mm) and hole 1/2"(12.7mm).

To get the image on the other side of the shaft, just mirror the original and then change the layer to 'hidden'.

[SteveMS]

Here, I have created the curve with a Bezier curve function.

How did you go? Need any more help? Thats what we are here for.

[bhill]

Thanks so much!

I will check them out today, was ill for a few days.

[SteveMS]

Hope your feeling better now? 

[bhill]

Hi There SteveMS,

Sorry I did not get back to you on this earlier.....I am back on this part trying to finish it up....

I just tried to open up your most recent two above files  - .2cd not the .pdf's, and although they show as ending in the .2cd extension, when I click on them they are saved as a completely different file name - index.php.

Both files are named index.php.

Also I am not sure what I am looking at, the drawings appear to have lines missing or lost something in transmission...I was able to open them in DC tried changing the name to the .2cd extension.

Can you post a PDF of them too so I can make sure what I am seeing in doublecad is correct? maybe I am missing something here or not sure what I am looking at...

The earlier PDF's I can view fine...

[SteveMS]

OK, I'll take a look for you as to why.

Try this one. Done for XT2. Originally done with XT Pro

[SteveMS]

Updated and PDF added.