## How To: Continuous Rotation & Indexing

Topics related to wrapped rotary machining in Aspire or VCarve Pro
Rcnewcomb
Vectric Archimage
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### Re: How To: Continuous Rotation & Indexing

The X or Y move speed (depending on whether your rotary is parallel Y or X) is translated into a rotational speed.

Consider a 4" diameter piece of material that is parallel to the X axis. Y moves will be translated into rotary moves.
The circumference of the cylinder is: 4 X 3.14 = 12.56
A Y move of 12.56" would cause the rotary to turn 1 revolution.

If the XY move speed is 100 ipm, and we are just moving in the wrapped direction then:
(move speed)/circumference = rotary speed = 100/12.56=7.96 RPM

Retired teachers: please check my work
- Randall Newcomb
10 fingers in, 10 fingers out, another good day in the shop

james70818
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### Re: How To: Continuous Rotation & Indexing

I'm trying to utilize the continuous rotation on a custom CNC that I bult. I can get the wrapping gadget to work and carve my project properly. What I would like to do now is change the start point. It currently starts Y0 and goes up in my case. I would rather it start at the top or Y96 and work its way down.

This machine I built uses a rotary table to hold a large work piece. If I start from the bottom and go up it could leave too much material on top and become unstable. By working top down, I can remove the waste and maintain stability as it cuts. I've run out of options to try and make it swap starting points. I think it has something to do with the wrapping gadget. It always starts at zero.

Thanks,
James

Rcnewcomb
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### Re: How To: Continuous Rotation & Indexing

I've run out of options to try and make it swap starting points.
I was a bit surprised when changing the start node on the spiral vector did not do what you wanted.

I'd suggest sending an email to support@vectric.com since they have some clever people supporting the rotary features.

In the interim you could swap your model around to see if that is a workable solution.
- Randall Newcomb
10 fingers in, 10 fingers out, another good day in the shop

SteveNelson46
Vectric Wizard
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### Re: How To: Continuous Rotation & Indexing

Change the start point to the other end of the spiral vector as suggested. Then, in the toolpath setup, select the "Start At" tab and select "Keep current start points" The red spiral toolpath indicates that this part will “pre-wind”, to maintain the zero-start reference point.
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Steve

james70818
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### Re: How To: Continuous Rotation & Indexing

I am assuming you use the node editor and select the wrapping vector, go all the way out to the end of the vector and I normally highlight the node and press P to make it the new start point and it turns green. It is not letting me make the end point my new start point.

james70818
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### Re: How To: Continuous Rotation & Indexing

Just to give a little back story on the machine I built: It has a turntable that is my A axis while the Z is a horizontal axis now and the Y axis lifts the Z up and down. Basically took a standard CNC and stood it up on end. Once you see that you understand why I want to start from Top Down.
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SteveNelson46
Vectric Wizard
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### Re: How To: Continuous Rotation & Indexing

Try clicking the right mouse button on the node and select "make start point". Works for me.
Steve

james70818
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### Re: How To: Continuous Rotation & Indexing

SteveNelson46 wrote:
Tue Jul 30, 2024 2:31 am
Try clicking the right mouse button on the node and select "make start point". Works for me.
For some reason, it will not allow me to do that on a wrapped vector.

SteveNelson46
Vectric Wizard
Posts: 2372
Joined: Wed Jan 04, 2012 2:43 pm
Model of CNC Machine: Camaster Stinger 1
Location: Tucson, Az.

### Re: How To: Continuous Rotation & Indexing

Can you post your file or a link to it? Otherwise, I'm just stabbing in the dark. We can go back an forth here and never solve the problem.
Vectric programs assume that the Z axis is vertical so I'm not sure there is a solution here.
Steve

MiloScott
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### Re: How To: Continuous Rotation & Indexing

james70818 wrote:
Mon Jul 29, 2024 6:40 pm
I'm trying to utilize the continuous rotation on a custom CNC that I bult. I can get the wrapping gadget to work and carve my project properly. What I would like to do now is change the start point. It currently starts Y0 and goes up in my case. I would rather it start at the top or Y96 and work its way down.
Try to mirror the vector. Position the start point at the top of the Job Setup. Ensure the vector Start At is at the top.
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MiloScott
Vectric Craftsman
Posts: 149
Joined: Sun Oct 16, 2016 3:10 am
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### Re: How To: Continuous Rotation & Indexing

james70818 wrote:
Tue Jul 30, 2024 2:47 pm
SteveNelson46 wrote:
Tue Jul 30, 2024 2:31 am
Try clicking the right mouse button on the node and select "make start point". Works for me.
For some reason, it will not allow me to do that on a wrapped vector.
Yesterday, I also couldn't get the toolpath to swap ends, which is why I ended up mirroring the vector. Today, everything is working as expected to change the "Start At" end, or change the start point of the vector... Aspire was mad, or, I didn't have enough coffee...

One thing to remember when changing the start point of the vector, the Gadget creates the vector in a "Group". Even though it is a single vector. You have to un-group the vector to change the start point. Guessing "Group" is the default due to the ability of the Gadget to create multiple vectors.

The one advantage to mirroring the vector and repositioning it to the top is that the part doesn't pre-wind (red spiral line in the preview) before it starts to cut.

james70818
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### Re: How To: Continuous Rotation & Indexing

So I can now do move the start point. Here are the lesson I learned.

First, the Wrapping vector has to be ungrouped. I guess when the wrapping gadget creates the vector and you then create the toolpath it groups the vector and the object it is projected on.

Secondly, You have to be in 2D View. While you can select the vector in 3D View with the node editor, it will not let you move the start point. Once you are in the 2D View it will allow you to relocate the start point.

Thanks for all the feed back. Stay tuned for some neat stuff I hope to post this weekend.

James