Re: axis names

>Message: 9
> Date: Mon, 04 Sep 2000 17:30:36 -0700
> From: Alan Marconett KM6VV <KM6VV@...>
>Subject: Re: RE: axis names

>So what would be an example of say, A motion? I don't think I've seen
>it in my limited researches. Do you know if FlashCut (my touchstone)
>supports it?

Nearly any 3 axis machine can utilize a rotary 4th. In a mill type set up, the Y is often disconnected and the rotary is connected in it's place. On one hand a rotary step is mechanically changed into a linear motion, and on the other a rotary step is changed into rotary motion. The only difference is how far the movement is with respect to the steps. That is almost entirely dependent on your physical hardware and most controllers will let you adjust the output to the desired scaling. Many machines also let you use all 4 axes at the same time.

The rotary 4th axis is usually programmed in degrees. The most common set up is an A axis. Which is parallel to the X, since most mills have the X as the longer axis. The setup can often include the rotary axis(a rotary table fitted with a drive motor) with a chuck or collet for holding and driving the part, and a tailstock with a center for supporting longer parts.

Complex programming of a rotary requires a Cad-Cam system to be of any practical use. For simple spirals, grooves and indexing from face to face on a cubic part, Cad-Cam is not required. However to program engraving, such as that generated with Vfontz, that is cut with a V-tipped cutter, you need the ability to transform the toolpath into a shape that is wrapped around an axis, and then translate that into G-code, including developing the rotational moves(A) that substitute for the Y axis. Vector's wrap cylinder function(included at no cost) does the transformation making the lettering tool paths curve around the axis (and preserving the Z relationships as radial relationships), and the rotary axis(extra cost option, ~$600) generates the complete G-code file consisting of X-Z-A coordinates. The wrap cylinder also can be used for wrapping a surface around an axis, as it retains all the Z variation as radial variation. To wrap a cone, draw the geometry at an angle in the X-Z plane (front view), it will then have a taper equal to the angle. You can also extrude a form through your geometry to develop a spherical or elliptical shape.

http://www.vectorcam.com

Best Regards, Fred Smith- IMService
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