How to drill holes in revolved hollow thin cylindrical plate

[baijupshah]

Please help,

 

I have created a Hollow Cylinder using Polysoild (Object Option). I want to drill holes(array) on the cylinder.

[ReMark]

Can we see an image of some sort?

[ReMark]

Something like this?

[JD Mather]

On the real world part - will the holes be drilled in a cylindrical part, or will they be drilled or punched on a flat sheet that is then rolled into a cylinder?

 

If drilled in a cylindrical part can't you simple Extrude a circle as a solid cylinder (or use the cylnder command) and then array and subtract?

 

If the second option, drilled in flat and then bent to cylinder - that is a bit more work and requires a bit more information from you. I await your response to first question.

[baijupshah]

Thanks for the Image. Is it possible to do same in AutoCAD 2010

yes exactly like the image posted by ReMark

 

"drilled or punched on a flat sheet that is then rolled into a cylinder"

 

Actaully there is a plate with holes(arrayed), needs to be bent like cylinder as shown in the image.

[Dadgad]

Welcome to the forum.

If you need to model it flat, you could do it like this.....

Command: RECTANG

Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]:

Specify other corner point or [Area/Dimensions/Rotation]:

Command: CIRCLE

CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

Specify radius of circle or [Diameter]:

Command: COPY

Select objects: 1 found

Select objects:

Current settings: Copy mode = Multiple

Specify base point or [Displacement/mOde] : o

Enter a copy mode option [single/Multiple] : m

Specify base point or [Displacement/mOde] :

Specify second point or [Array] : a

Enter number of items to array: 8

Specify second point or [Fit]: f

Specify second point or [Array]:

Command: _-view Enter an option

[?/Delete/Orthographic/Restore/Save/sEttings/Window]: _seiso Regenerating model.

Command: ppp

PRESSPULL

Click inside bounded areas to press or pull:

6 loops extracted.

6 Regions created.

1 loop extracted.

1 Region created.

Select solids, surfaces, and regions to subtract from ..

Subtracting inner regions...

2

Click inside bounded areas to press or pull:

Command: _vscurrent

Enter an option

[2dwireframe/Wireframe/Hidden/Realistic/Conceptual/Shaded/shaded with

Edges/shades of Gray/SKetchy/X-ray/Other] : _R

[baijupshah]

Thanks for this quick reply,

 

The problem still remains. I made a plate, Drilled holes. I want to Bend it.

How to bend it? please refer the image posted by ReMark. That kind of bend.

 

 

thanks for the detailed steps.

[Dadgad]

You cannot bend it to shape in Autocad, to the best of my knowledge.

INVENTOR has tools for working with SHEET METAL which will do it.

 

ReMark did not BEND it, he modeled it that way, if you check you will see that there is no seam where edges would need to be joined.

 

If you are going to do it in Autocad I believe you will have to do it in its completed configuration.

While you cannot start with your flat modeled piece of plate and bend it into its final shape, you can model it directly

in the finished shape, displaying the gap at the seam, as if it had been bent into that shape.

Edited September 1, 2012 by Dadgad

[JD Mather]

You will need Autodesk Inventor to make that part correctly.

You can get close in AutoCAD by

creating a circle something like 359.9° at desired inside or outside radius.

Extrude as a surface body.

Create circle for hole.

Trim the surface body with the hole (array as needed). (this is not technically correct as the circle would distort as the part is bent)

Thicken the surface body into a solid. (creating the cylinder as a solid and subtracting cylinder for holes would result in incorrect sidewalls of holes)

 

How precise do you need this result?

AutoCAD has no way of calculating Bend Allowance.

When a material is bent it stretches on the outside of the bend and compresses in the inside radius.

The neutral plane (no stretch or compression) is not necessarily at the midplane of the thickness (in fact, usually not).

The Bend Allowance is dependent on material, thickness, inside radius and angle of bend.

The Machinery's Handbook as formulas for manual calculation.

Autodesk Inventor will calculate Bend Allowance for you (and do the geometry correctly).

Students can download Inventor for free from http://www.autodesk.com/edcommunity

 

Be aware that Inventor Fusion is not Inventor.

[baijupshah]

Thanks very much sir for the detailed explanation.

 

I will start learning Inventor and Try this.

[JD Mather]

I will start learning Inventor and Try this.

 

This question comes up quite frequently on the Inventor Forums - there is still a bit of a trick to get the holes correct if you arn't familiar with sheet metal processes.

They can be round in the flat or the bent part - but not both. You have to make a decision if you want round in the flat (less expensive) and allow clearance or round in the bent part (more expensive) and design the eliptical punches that would result in flat forming to round.