On 5 May 2010 19:49, Leonardo Marsaglia <leonardomarsagli...@gmail.com> wrote:
> I understand the most of your idea and it seems to be good, but i don't have > clear if i should use the spindle in rpm mode, or as rotary axis in degree > mode... because my first idea was to use 2 axis ... one rotary and the > second linear, like a normal mill. This is partly because I am not clear what your machine is, or what it is for. Initially I thought it was a lathe which you were using to machine camshafts, and you wanted to add a cam-lobe roughing stage to the process. Now I am getting the feeling that it is a dedicated cam-milling machine. If it is a cam-milling machine and there is no need for lathe-type spindle speeds then you might as well convert it to a 2-axis milling machine, with a servo-controlled spindle driven through reduction gearing of some sort. A harmonic drive would probably be perfect. Please bear in mind that I am no expert on machine tools or on EMC2, I am just thinking aloud and that my advice might be worth even less than you are paying for it. > Another question would be... how can i generate my profiles with that > component, an idea that comes to my mind to apply the offsets would be using > a gauge to measure the original lobe and then transpose those points as > offsets to the different positions of the lobe. Firstly there is a great deal of confusion here, as you are making cams, and the software that produces G-code is normally called CAM software. So software to design cams would be "cam CAM".... I had actually assumed that you already had some sort of cam CAM for designing the profiles. However, once you have a working machine it would be very simple to use it to probe and measure all your existing master cams, even putting the data automatically into text files for you. (EMC has a way to do that) > And what do you think about milling the cams with a rotary axis and a X > axis, like normal mill? that would be simpler since i can generate the > profile with any cam software. It rather depends on if you mean cam software or CAM software :-). The former will tend to give you a table of angles against cam height, whereas the latter will tend to give you a G-code program. The two are effectively interchangeable with a bit of postprocessing. If you have a table of angles and heights then the HAL module I suggested would be easiest (but do bear in mind that it is entirely imaginary and was based on the idea of making a lathe into a cam-profiler). In the case of the latter then you definitely want to be thinking in terms of a servo-controlled spindle that moves in accordance to C-words in G-code. -- atp ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
