I was happily milling away today until suddenly the spindle stopped. I can still hear a very light buzz but nothing happens anymore. I hoped for a hidden thermal protection, but after cooling down the spindle still doesn't start. This a asynchronous motor BTW. I don't think it is the condensator because the motor stopped while turning. The condensator is only needed to get it started. I still measure a resistance over the coils. Hmm, now I think of it, the resistance isn't equal over both coils and it should be. Well, I always was prepared for a (plastic) gear to break. I never thought the motor itself would die. Just to elaborate a bit for the question: This is the machine I have: http://www.mike-willis.com/Pictures/Misc/hobbymat6.jpg this is only the spindle. Couldn't find an image from the xy stage. It is nothing more than a hobbymachine. But it works fine and it is very good for learning CNC and CAM. Because of the backlash in the stages climb cutting isn't really working unless I use a very small feedrate and small mill. And conventional cutting isn't really working either in aluminium with a mill of 10 mm. I don't dare to try steel or anything stronger. So, considering the limitations, I was thinking of a faster spindle, max rpm is now 1600, and limit the mill diameter, let's assume 6 mm maximum. I have found this a while ago: http://www.recumbents.com/WISIL/shumaker/CNC1.jpg http://www.recumbents.com/WISIL/shumaker/CNC2.jpg (an amazing project BTW: http://www.recumbents.com/WISIL/shumaker/default.htm) Since then I am thinking of using such a brushless outrunner motor. Does anyone here has any experience with these? The motors aren't really expensive, but the controllers are. Well, the good ones. I don't care about investing a bit, but in the end, it is only a hobbymachine and it doesn't earn me money, only knowledge. Using an outrunner would be educational. But I would need to machine a lot of parts and the machine doesn't work.... I have access to conventional machines so this isn't the biggest problem. OTOH, buying a complete spindle is more expensive, but with an adaptor plate it could go straight on the machine. So, what to do?
Dirk PS: Sorry for the long explanation, but I figured I could better explain it upfront than afterwards in several mails. ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
