Good evening, I spent some time today in the G-Code docs looking at G74 and G84 (left and right hand tapping with a tension-compression head in mind) in an attempt to fully understand the options.
I found the docs for these G-Codes to be a bit vague, and confusing. Especially given that R- and L- seems to change around depending on the G-Code associated (not a complaint, just an observation) and F- was not mentioned at all. I made some changes that I would like to submit for a Pull Request, but I wanted to ping the group and clear something up first. G74 and G84 don't explicitly mention that the Z axis movement is* not* synchronous with the spindle speed, and as such, I found it troubling that both G-Codes will accept an L- value to determine the number of times the cycle will be ran at the same XY coordinates. I can't think of any reason to try to tap the same hole more than once with a tension-compression head. Unless one really likes gambling ... or messed up threads :) In Axis SIM, LinuxCNC is happy to try to tap the same hole any number of times (determined by L- of course). However I have a Tormach mill and found it interesting in Pathpilot, LinuxCNC will ignore any value entered for L-, so obviously at some point they removed this "feature". The question I have is: Is it better to pursue removing the L- functionality from G74 and G84, or is it better to remove the reference from the docs? Or, lastly, is there a legitimate use case I am missing here? I am not sure if this email service will accept attachments, but if it does and if anyone is interested, I am happy to send the .diff of my proposed changes to the docs. Thanks, Greg (Snowgoer540) _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
