I see this idea come up every now and then. If the Machine is not square then you square up the machine. If the ways are worn then you refinish them, and If the lead screws ar worn you replace them. You're right it is impossible to build a perfect tilting rotary table, or anything else no matter how small the error may be. I have used tilting rotary tables to inspect parts and you'd need to look damn hard to find the inaccuracies in those tables. I know from working with machinery fo 34 years that unless you have some instrument that can measure in micro inches you can't acheive micro inch precision. In order to compensate more all the machine and tooling inaccuracies you first have to be able to measure them. In manufacturing every dimension has a tolerance appropriate for each and every feature of the part to be machined. Not everything needs to be perfect. It's not difficult to align tooling of any kind on a machine including a tilting rotary table. Besides the ability to measure accurately there are thermal factors. Rigidity of the machine and tool holders is not constant. The longer you have to reach the more deflection you will encounter. The amount of deflection also changes as the cutting tool wears as well as with feeds and speeds. You are talking about a huge battle to get software to compensate for what is part of a machinsts job. If the machine is not up to the task I would consider it a loosing battle. Before taking on such a challenge I'd strongly suggest that the machine and tooling is up to specs in order to even have a chance at a successfull implemantation. Like it's been said, "You can't make a silk purse out of a sow's ear".
I wish you the best of luck and do hope you keep us all informed as to your progress and successes/failures. To have EMC compensate for inaccuracies in the machine alignment would be a great asset. If I should ever find the room to contine building my second (larger) machine. It sure would be nice, there are limits as to just how accurate I can build and align a machine in my garage. Dale Stuart Stevenson wrote: > Gentlemen, > I want to start a dialog concerning how best to implement geometry > compensation. At this point I am not thinking about roll, pitch and > yaw. These may be included but my main concern is the manufacturing > inaccuracies of multiple rotary motion components. > It is impossible to build a perfect tilting rotary table. The > intersection of the axes will not be perfect. > I would like to have registers to hold compensation values > representing the determined manufacturing inaccuracies. This would > allow the control to compensate the linear motion positions to > 'perfect' the tilting rotary table. > I have just requested three items. This is the fourth. If I am > successful in the implementation the the three items I should be much > more able to address this myself. > > Any and all suggestions and comments are welcome. > > thanks > Stuart > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
