Sorry, I forgot to include the code. Here it is > -----Original Message----- > From: John Chambers > Sent: Wednesday, November 05, 2003 9:46 AM > To: 'John A.'; [EMAIL PROTECTED] > Subject: RE: [mfg-smartcam] O/T-mathematical problem > > > The easy answer: Get Bysoft, and a Bystronics laser. > Attached are some illustrations that show how such a part is > programmed in Bysoft, And the code to cut it. The G51 in > line 2 tells the machine to treat the rotary axis at radius > 3.938 as the Y axis. Then, the ellipse is simulated with a > series of arcs. > > Actually there are two different ways to cut this, which, if > your wall thickness is thin enough, you would never know the > difference. That is fit up, or fit through. See > illustration 5. Fit through takes the laser through the true > ellipse, but it won't fit up very good if you have much wall > thickness. Unless you are using a 5th axis (tilting head) to > point always to the center of the ellipse, the inside wall > will not be the same cut as the outside wall. The Bysoft > system takes this into account to get a good fit up if you > need it. Bysoft can also intersect different size pipes. > > The real answer: > If your machine doesn't have this capability, you will > probably have to devise a system to simulate the ellipse with > straight lines like: G1X...A... commands. > > Good luck. > > using 8.75 od, 1/8 wall. > Illustration 1: specifying the cut. > Illustration 2: what you get after specifying the cut. > Illustration 3: The 3d view of what you specified. > Illustration 4: Simulation of the code. > Illustration 5: Fit up versus fit through cutoff. > (exaggerated wall thickness 1") > > > Disclaimer: I do not work for Bystronics, just a satisfied customer. > > > -----Original Message----- > From: John A. [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 04, 2003 10:10 AM > To: [EMAIL PROTECTED] > Subject: [mfg-smartcam] O/T-mathematical problem > > > > Hello all, > I have a problem here for those mathematically inclined > individuals. This really has nothing to do with Smartcam. > We have a Platino laser and a 7.874 diameter quartz tube > that we need to cut a 10 degree slice off of one end. We are > putting it on a rotary axis and we actually program an > ellipse to cut as the axis is turning. What we get is a part > with a rather pronounced dip at the lowest point instead of a > smooth transition as the axis direction changes. > My question is this: Can anyone figure what the dimensions > of the ellipse should be or what the ratio of the feedrate of > the rotary axis speed to the laser head speed should be? > Hopefully someone has encountered a similar issue and will be > willing to help. Maybe a formula to apply to all degrees of > cut and diameters of tube. > Thanks, > John Acosta > > > > > > > Customize MSN Messenger with backgrounds, emoticons and more. > ============================================================== > ======== To find out more about this mailing list including > how to unsubscribe, send the message "info mfg-smartcam" to > [EMAIL PROTECTED] > ====================================================================== >
10degcut.lcc
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