Hello all, Not sure if this is where I should ask this question, but thought I would give it a try.
I have been slowly doing a video series on CNC for the home hobbyist. I been trying to cover stuff in small digestible chunks so that newbies who are wanting to get into CNC from a home shop or hobbyist point of view would have some resources available. The last video I made talked about linear motion, and I suggested that when configuring that the system would be easiest to configure in whatever units the linear motion is in. Inch or metric. After releasing this video I received an email stating the following. ==================== <QUOTE> Another friend of mine got a Cincinnatti machine and converted it to linuxcnc control. As it has metric ballscrews, he configured it that way in the config file. Everything worked great UNTIL....... he tried to use cutter comp. It seems that cutter comp has to be used in the configured units and won't work properly in imperial even though all the rest of the gcode etc is in imperial! In order to use cutter comp, he had to convert the inch offset to metric and input that! To alleviate the problem, he had to go back and convert the metric setting to imperial and start over as he predominantly works in inches! The control doesn't care really as the input is just a number. For example instead of inputting a pitch for a 5mm screw, of 5; input 0.196850393700787 which is the inch equivalent! </QUOTE> ==================== What I take from this is that the machine was initially configure in metric because of the leadscrews, and his g-code was written in imperial units. The problem appearing to be that when the tool file is read, the offsets are interpreted as metric. Is this the case? Is this a bug? I don't have a timeline of the events or version of LCNC being talked about. Is this something that has been corrected, if the problem existed? If the problem exists, does the reverse hold true? For example, if I configure a machine to use imperial units initially and I use g-code written for metric, will the controller read the tool file offsets as imperial? Sorry for the blather on, I just want to try and give the most accurate information I can. I am not a machinist, engineer or a teacher but am doing my best. If your interested, the playlist for the videos I have created so far can be found here: https://www.youtube.com/playlist?list=PLaamliiI72ntlrHKIFjh2VjmehRGgZpjm Thanks folks for all the work you do. You make LCNC a better product day by day! Regards, Joe Joe Hildreth IT Manager Three Rivers Hospital 451 Hwy 13 South Waverly, TN 37185 (931) 296-0217 (office) (931) 622-3130 (cell) _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
