Hi guys,
I am in a somewhat similar situation. I sort of handle the setup of the CNC for my dad's cabinet shop, but I am trying to develop the ability to mill 7075 molds for short runs to augment my own business, which involves producing RTV/urethane rapid prototypes for the toy industry.
I am currently trying to use the CNC router to do 3d contouring and am running into acc/dec problems. It's a Komo VR510 with a Fanuc 210i-M control. In theory I can run 18,000 rpm @1250 ipm (rapid & cut). I am in the process of trying to get Komo to fax me with the option list for our 210i.
I was apparently too uneducated when we were doing our shopping, but isn't that how it usually goes. They sold us G08 as "HSHP" (high speed high precision), but now I understand it is just look-ahead. The machine works excellent for cutting cabinet parts, but when I run programs generated with VisualMill, the machine will only make 15-40 ipm actual feed. This is accompanied by hundreds of unprogrammed dwells, as you may have been able to guess.
My current theory is that Komo configured the acc/dec to deal with very long, fast moves followed by right angle turns, and back up to full speed.
If I disable G08, the machine runs acceptable feeds, but I can tell some acc/dec is needed (read: rapid gouges, inaccuracy). I have been trying for some time to decipher the Fanuc Infolink CD-ROM we got with the machine, but am looking for more direction on how to tune our servos to deal with these problems.
If anyone knows of any good books on (Fanuc) servo tuning, changing acc/dec params, angular/radius feedrate clamp settings, etc., I would be very grateful. (or maybe just a good used 15i
)
Thanks,
Jeremy Hill
jerhill1@netzero.com: