Doug, Keep in mind that the Oz In numbers for steppers are holding torque. This number is pretty much useless as it is a steady state or a not doing any work number. Take a look at automationdirect stepper motor charts for some real info on torque and speed.
Some things to consider when converting a manual machine to CNC: How much force does it take to turn the lead screw? How much does the Z weigh and can you counter balance it so the Z motor does not have to lift dead weight? Skipping on, EMC does not generate G codes, it takes them and uses that info to run your machine. For simple things it is easy to write your own G Codes. There are some G Code Generators on the Wiki site that can do various things. Your assumtion that bigger steppers are slower is dead on. The xylotex board with a 24 volt power supply will be pretty slow and low on power. You may have to play with gearing some depending on your mill. There is a spreadsheet on the wiki that helps with gearing and other cool things. If you can pop over to the EMC forum and post a picture of your machine. John On 11 Apr 2009 at 13:00, Doug Pollard wrote: > Hi all, I have built a bench mill from a fairly heavy duty drill > press. I beefed it up where I could and filled the column with > lead > shot. It's pretty solid and chatter resistant :-) > My Grandson gave me a 4 axis controller and cables . I hope > to > make a four axis machine out of this to do a little light machining > on. > I rebuild microscopes and some other medical supplies for a > nonprofit > company that supplies these things where they are needed world wide. > My > years of machining know how is hard for them to get so I am trying > to > give a little something back. > The controller is an xylotex board , and a 24 volt power > supply. > Have been doing a little reading and am thinking I will need a break > out > board. I would like to use Emc to generate G-codes. I use > Ubuntu > .10 but am looking for another used computer to run Ubuntu 8.04 and > EMS > 2 on to control the mill. > I could get all the help I need from my grandson who holds me a > little in awe for my machining ability but would would rather ask > dumb > questions of you guys. > Is there any reason why Emc will not run my xylotex board. I > would > also like to know what kind of breakout board might be suitable. > Have > been looking at some 269 OZ in motors but also thinking that my mill > has > a pretty sturdy spindle that maybe 425 0z in. might make better use > of > that. Since the table is only 18 inch long with 12in. of travel > high > speed might not be that important. I am assuming the more powerful > motors may be slower?? > Any other suggestions here would be greatly appreciated. > > > Doug > > -------------------------------------------------------------------- > ---------- > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
