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Author Topic: Rounded-over chamfer of existing hole?  (Read 4830 times)
lloydsp
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« on: May 22, 2017, 02:01:30 am »

Does anyone have a script or plugin that will do a smoothly-radiused round-over of the top edge of a cylindrical hole?

I think I have the knowledge to do one, but it would be a waste if one already exists.

Thanks,
Lloyd
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Garyhlucas
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« Reply #1 on: May 22, 2017, 02:07:50 am »

Profile it using a radius.  Did that on the fidgit spinners I made with my grandson before I got the chamfer tool.
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lloydsp
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« Reply #2 on: May 22, 2017, 02:15:50 am »

Yeah, I can do that Gary, but I was looking for something that would create a variable radius with a center that could possibly be above the stock surface -- so the chamfer might be anything from a full 'round-over' to only a slight 'bevel', but STILL with the same fundamental radius.

And, yeah, I could do that by 'faking' the stock surface height.

Lloyd
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Bob La Londe
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« Reply #3 on: May 22, 2017, 05:12:55 am »

You gotta find the points, you can do a chamfer into radius or other wall shape.  I got a video...

https://youtu.be/Hxpu8JwZ5bc

Maybe it will help
« Last Edit: May 22, 2017, 05:31:04 am by Bob La Londe » Logged

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dave benson
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« Reply #4 on: May 22, 2017, 05:51:42 am »

HI LLoyd
Use this version of the collision detector
just select the tool from your library--> V cutter. enter the angle.
here are some shots below.
use the provided .dll not the later slimmed down version.
Dave


* chamferCapture.PNG (33.25 KB, 573x417 - viewed 59 times.)

* chamfer2Capture.PNG (165.55 KB, 1134x665 - viewed 60 times.)
* Collision Detector (old).zip (104.6 KB - downloaded 31 times.)
« Last Edit: May 22, 2017, 06:10:46 am by dave benson » Logged
EddyCurrent
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« Reply #5 on: May 22, 2017, 11:09:59 am »

You could use this plugin; http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/Spiral2helix.html

I've attached a cb file with example. (it's all metric  Wink)
There is a pdf manual for the plugin, it's attached below.

The only thing is, all generated spirals are centred on X,Y = 0,0 so after generation it has to be moved to the appropriate position.

I think I will update the plugin so it can work this way or allow the centre point to be specified.

In the example cb file, just select the profile line then run the plugin, use settings as shown in the picture.
The main point is, the roundover shape can be whatever you draw as the profile polyline, and drill the hole first.

* roundover.cb (1.36 KB - downloaded 29 times.)
* Profile2HeliixDoc.zip (754.44 KB - downloaded 40 times.)

* roundover.jpg (122.69 KB, 1000x641 - viewed 46 times.)
« Last Edit: May 22, 2017, 11:14:20 am by EddyCurrent » Logged
lloydsp
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« Reply #6 on: May 22, 2017, 12:04:16 pm »

Well,
It's fairly simply done with rounding-over, if you happen to remember that you must add a roughing clearance equal to the tool's radius.

Eh... I got this done, but methinks I'll be writing another script.  It should be FAR easier than any of these methods.  FAR easier than the built-in rounding-over method.  It should be simple.

It's not, actually!

Lloyd
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dh42
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« Reply #7 on: May 22, 2017, 16:01:19 pm »

Hello

Also, you can use Eddy's Revolved Extrude plugin and a 3D waterline mop

http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/RevolveExtrude.html

++
David
« Last Edit: May 22, 2017, 16:03:15 pm by dh42 » Logged
lloydsp
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« Reply #8 on: May 22, 2017, 16:55:58 pm »

All of those, though, David, require that you draw something.

I just want an app that upon selecting two (maybe three) variables, will instantly create a 'rounding over' MOp without any other effort.

I now have a client who'll require dozens of unique designs, all with different rounded-over profiles of the top edge of a cylindrical cavity.  It should be "click-click-click" and done... but right now, it took me almost a half-hour of 'fiddling around' with the built-in CB features (and I'd presume about as much time to draw, rotate, place, and create a MOp by hand).

It should be an 'automatic feature', and I intend to make it so.  If the script works as desired, I could make it a plugin menu item.

Lloyd
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Bubba
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« Reply #9 on: May 22, 2017, 18:32:38 pm »

It certainly be nice to have C'sink and Roundover MOP's.. Grin
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lloydsp
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« Reply #10 on: May 22, 2017, 18:47:13 pm »

When I get to the point of writing it, I'll add square and angled countersinks to it.  It's 'about the same'... just different contours.

It'll be a few weeks.  I'm in the middle of a very IMPORTANT piece of research work for a major pyrotechnics engineering company, to design a product that's never been done before.

This need came as part of that project.  I can see this developing into a multi-times-daily need; thus, the need for a script or plugin.

LLoyd
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dh42
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« Reply #11 on: May 22, 2017, 19:04:37 pm »

Quote
All of those, though, David, require that you draw something.

Yes  Smiley ... in my case it's almost always already drawn, because all projects starts with a 3D object (SW), so, even if I works on the DXF for 2D, the 3D is already here. (so I like the last R13, because all 2D are also usable without to have to load the DXF too)

Quote
It should be "click-click-click" and done

Yes, "click-click-click", I love too  Grin

The side profile is an useful features but not really user friendly !

++
David
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EddyCurrent
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« Reply #12 on: May 22, 2017, 19:58:58 pm »

Watch this video from 10 minutes in for at least 5 minutes ;http://www.cambam.info/vids/CAM-Styles/
He makes a chamfer style that can be applied with  "click-click-click"
As we know, roundovers can also be made using this method.  Wink
« Last Edit: May 22, 2017, 20:06:03 pm by EddyCurrent » Logged
Bubba
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« Reply #13 on: May 22, 2017, 21:09:03 pm »

You right Eddy,
 I remember watching this wideo while back but I forgot about it..  Embarrassed

Yeah, the CB styles are definitely something I need to study and familiarize myself with.
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lloydsp
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« Reply #14 on: May 22, 2017, 21:30:55 pm »

Yeah, but Eddy, you missed my point.

Sure, it's easy to make a 45-degree chamfer, because you already know the slope.   And in this particular case (45-degrees) it's 1:1, so the roughing clearance is equal to the depth.

But let's say you wanted to do a radiused chamfer, but only half-the radius deep.  How, exactly, would you calculate the roughing clearance, and the starting points?

I actually think you made my point.  It's not possible to do - easily - a variety of countersink styles in CB, without some sort of 'aid'.  That would be the purpose of such a plug-in.

I've done lots of 45-degree countersinks with CB.  Tell me exactly how you do 60-degree ones (without doing any math! <grin>).

Lloyd

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