John Kasunich wrote: > Ed wrote: > >>A while back someone mentioned video recording the workshop classes and >>offering them on DVD. Since I will not arrive until Thurs evening at >>best I will miss most of the classes that have the most interest to me >>(CL and HAL). On another note, has anyone done much with electronic >>gearing? I have an old horizontal mill that I would like to convert to a >>gear hobber, it looks like if you had an encoder on the spindle to track >>its rotation and a servo on an index head to rotate the work piece it >>could be done by setting a ratio between them. The problem I see is that >>the spindle might have to turn several hundreds of times for a complete >>cutting cycle. Can be done without running out of counters? Ed >> > > > It can be done. About three years ago this topic came up, and I wrote a > HAL component that can be used to do electronic gearing. It is done in > such a way that it will never overflow no matter how long you run. It > will also work for any ratio, as long as the product of the encoder PPR > and the gear tooth count is less than 2^31 (4 billion). > > There is no man page for the component, but there is fairly detailed > documentation in the source. You can view it at > http://cvs.linuxcnc.org/cgi-bin/cvsweb.cgi/emc2/src/hal/components/encoder_ratio.c?rev=1.12 > > Regards, > > John Kasunich
It looks like I have schoolin' to do! The systems I have done so far have been simple ones that have 4 axiis and a couple on/off SSR's. The outlook is to learn enough to be able to setup a machine such as the Galesburg Mazak, tool changers being the big item. Ed. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
