Rotary Top at Angle

Topics related to wrapped rotary machining in Aspire or VCarve Pro
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Wayne Locke
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Rotary Top at Angle

Post by Wayne Locke »

Is there a way to turn this stair balluster
Screen Shot 2022-07-07 at 7.57.02 PM.png
with an angled top of about 36˚ and keep the flair? I can't find a way but I may well be missing something.

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Rcnewcomb
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Re: Rotary Top at Angle

Post by Rcnewcomb »

Should be doable with the moulding toolpath. Do you have a clean vector of the profile?
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Re: Rotary Top at Angle

Post by Wayne Locke »

Thanks Randal. Here is part of the file with the basic shape. The Moulding Toolpath seems to be in the right direction but I seem to have missed a couple of turns.
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Balluster_2z.crv3d
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SteveNelson46
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Re: Rotary Top at Angle

Post by SteveNelson46 »

It might be do-able with a moulding toolpath but I think a 2 rail sweep would be easier. At least for me anyway.
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Balluster.png
Balluster setup.png
Balluster.zip
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Re: Rotary Top at Angle

Post by Wayne Locke »

Here is how I ultimately arrived at something usable if I decide to do it. The 2 Rail Sweep worked better for me than the moulding toolpath and is also my intuitive go to tool for this kind of thing. After many iterations of the Drive Rails I settled on the vee shape which results in a point at the connection point.
Screen Shot 2022-07-09 at 12.10.31 PM.png
There may be a mathematical way to arrive at an elliptical shape which would eliminate the point but my degree is in English so I can only describe not calculate. I eliminated the components in the uploaded file so that it would be small enough to upload but you can see the rails and the cross section I used as well as some vectors for trimming the top component. You can create a 2 Rail with the file.

Every iteration left junk on the ends.
Screen Shot 2022-07-09 at 11.41.02 AM.png
I added Dowell components on the ends for mounting. This also negated some of the artifacts.
Screen Shot 2022-07-09 at 11.41.30 AM.png
I finally added a component labeled Texture to give it a hint of Art Nouveau.
Screen Shot 2022-07-09 at 11.43.21 AM.png
Screen Shot 2022-07-09 at 11.43.46 AM.png
With the texture the points became less objectionable and contributed to the design.

If someone has other ideas I am all ears.
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SteveNelson46
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Re: Rotary Top at Angle

Post by SteveNelson46 »

I gave you the completed file with a 2 rail sweep. Was there something wrong with it?
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Re: Rotary Top at Angle

Post by Wayne Locke »

I had already done a straight 2 rail but was having trouble with placing an angle on both ends. I appreciate your file but it is the same as my original example and the file I posted in my second post. Your file does not address tapered ends which was my problem.

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Re: Rotary Top at Angle

Post by SteveNelson46 »

Without a picture or something to compare to I don't understand what you are trying to do.
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Angled top.png
Angled top2.png
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Re: Rotary Top at Angle

Post by Wayne Locke »

See my last post with images.

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Re: Rotary Top at Angle

Post by adze_cnc »

Steve: This seems to be what's wanted. A knobbly baluster that has each end cut at an angle to run under a hand-rail and along a stringer.

Can that done by modelling in something then subtracting it from the bulbed end?

Steven
The stem of this "mushroom" is a dowel to be slotted into stringer or hand-rail
The stem of this "mushroom" is a dowel to be slotted into stringer or hand-rail

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Re: Rotary Top at Angle

Post by Wayne Locke »

I'm sorry if I wasn't clear. My recent post with a file and 4 or 5 images I thought illustrated and explained it. You cannot merely subtract a shape because I want to have the flare as Adze called it follow the angle around. Although this is a screenshot and not very good, I think that it shows what I am shooting for. .
Screen Shot 2022-07-09 at 6.10.15 PM.png
Thank you for your efforts.

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Re: Rotary Top at Angle

Post by SteveNelson46 »

adze_cnc wrote:
Sat Jul 09, 2022 11:34 pm
Steve: This seems to be what's wanted. A knobbly baluster that has each end cut at an angle to run under a hand-rail and along a stringer.

Can that done by modelling in something then subtracting it from the bulbed end?

Steven

sloped.jpg
Maybe, but I think it would take more work and experimentation. At least for me. I could model it in Rhino, as you did, but I don't think that would help him.
Steve

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