On 12 October 2011 08:58, Robert von Knobloch <b...@engelking.de> wrote:
> X0, Y0 and set AXIS to display CXYZ. Things are looking quite good. > We notice two somewhat strange effects: > f100 > g00 X0 Y10 > g01 C360 (Cut a circle with middle of tool 10mm from chuck > centre) > > The chuck moves at some speed (hard to measure, easy to hear - stepper) > > But > With a larger circular cut, e.g. > > f100 > g00 C0 X0 Y20 > g01 C360 (Cut a circle with middle of tool 20mm from chuck > centre) > > The chuck moves at a greater speed, seemingly recognising the geometry. > > But > With a spiral cut, e.g. > > f100 > g00 C0 X0 Y20 > g01 Y10 C360 > > The chuck stays at a constant rotational speed throughout the spiral cut > (which is performed correctly in space). That seems very strange. For the same feed-rate in C the speed of rotation of the axis should be the same and should be independent of the non-moving axis positions. > > Stuart, can you guide me to information regarding "CSS", I find no > reference in the EMC docs ? CSS is "constant surface speed" and is only really relevant to lathes (though I assume you could link it to the tool-table so that the correct spindle speed was chosen for each tool). It alters the spindle speed relative to workpiece diameter. It doesn't affect axis rotation speed. > During a circular cut (as above), the AXIS display shows the machine > limits box and a circle about x0 y0 which the 'tool' element travels. > If we cut a 180° path and then move Y, the Y axis (in the AXIS display, > not the machine) has become inverted I think CXYZ shows the cutter path (and machine) from the point of view of the work. XYZC would show it from the point of view of the machine, but then I don't think you see the rotary moves in the toolpath. (as the cutter isn't moving relative to XYZ.) It's a tricky situation, with neither answer being quite right. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
