DeltaCad User's Group Forums

Hello friends!

I leave on Brazil and use Delta Cad to run on Lazy turn. I have a CNC Sherline lathe and found difficult to run on it specific drawer knob that I design on delta cad.

I'm asking somebody to help me to solve this question, if possible.


Enclosed P2.dc file


Many thanks

Leo

The endpoints of your ellipses do not match up precisely.
Check your Lazy Turn software to see how much mismatch is allowed.
Check to see if mismatch tolerance can be changed.
Otherwise edit your DeltaCad to get the ellipses endpoints closer.

Here are the coordinates of your CAD drawing.

If this is not the solution to your problem then give more detail to your problem.

I have new information
There is a tiny ellipse (.004768 long) between the 2nd and 3rd ellipses that might be your problem.
I found it after I trimmed (Edit / Slide an endpoint) the endpoints away from the intersection.

  Start X      Start Y       End X        End Y

 0.00192100   0.286234     -3.192963     8.269336    ellipse
-3.187902     8.260679     -5.318714    10.228955    ellipse
-5.318714    10.228955     -5.314222    10.230553    ellipse  <-- This ellipse is tiny only .004768 long
-5.313773    10.216481     -7.749917    11.903283    ellipse
-7.742008    11.882147    -14.297750     5.286234    ellipse
-14.297750    5.286234    -22.400003     5.286234    line
-22.400003    5.286234    -26.109735     9.574351    ellipse
-26.098922    9.575541    -29.555618    10.542215    ellipse
-29.555618   10.542215    -29.555618     3.994956    line
-29.555618    3.994956    -40.998079     3.994956    line
-40.998079    3.994956    -40.998079     0.286234    line

(10-21-2019, 04:50 PM)AlwMVMO Wrote: [ -> ]I have new information
There is a tiny ellipse (.004768 long) between the 2nd and 3rd ellipses that might be your problem.
I found it after I trimmed (Edit / Slide an endpoint) the endpoints away from the intersection.

  Start X      Start Y       End X        End Y

 0.00192100   0.286234     -3.192963     8.269336    ellipse
-3.187902     8.260679     -5.318714    10.228955    ellipse
-5.318714    10.228955     -5.314222    10.230553    ellipse  <-- This ellipse is tiny only .004768 long
-5.313773    10.216481     -7.749917    11.903283    ellipse
-7.742008    11.882147    -14.297750     5.286234    ellipse
-14.297750    5.286234    -22.400003     5.286234    line
-22.400003    5.286234    -26.109735     9.574351    ellipse
-26.098922    9.575541    -29.555618    10.542215    ellipse
-29.555618   10.542215    -29.555618     3.994956    line
-29.555618    3.994956    -40.998079     3.994956    line
-40.998079    3.994956    -40.998079     0.286234    line

Hello!!

You are correct!! I did not get match the ellipse ends. (both +) never match. I believe that is because the ellipse curvature is fixed and could not be moved. I replace ellipse to straight lines and had successes. I have to make five ivory knobs and I'll do them with straight lines and after that, do hand finishing with sandpaper.

Anyway, many thanks for your attention and sorry my bad English. Have a good week.

Sometimes I will break up an ellipse into several arcs using the "Draw a circular arc using three points" under the Circle tab.
It will give a smooth outline to an ellipse using circular arcs which most CAD/CAM will be able to use.

Also draw using THIN then go to Options menu / Drawing Data . . . and change Thin Line Thickness 
to a smaller number like .005 then you will be able to see mismatches more easily.

(10-21-2019, 11:12 PM)AlwMVMO Wrote: [ -> ]Sometimes I will break up an ellipse into several arcs using the "Draw a circular arc using three points" under the Circle tab.
It will give a smooth outline to an ellipse using circular arcs which most CAD/CAM will be able to use.

Also draw using THIN then go to Options menu / Drawing Data . . . and change Thin Line Thickness 
to a smaller number like .005 then you will be able to see mismatches more easily.

Hi! Thanks! Will try. Good hint!