Thanks Steve, My first project I want to cut a circle into a round flat piece of plastic to use as a centering tool O have seen on some web sites. Looked at the .ini file and see why my Z axis only moves a bit. somehow the step conf told it to only move min and max limit of 0.01 inches. I'll have another look and make sure I did not do that but now have a better understanding of the .ini file. Now I need to calibrate the machine so when it moves an inch it does that. Its real close though now.
Gary K8IZ At 07:33 PM 6/6/2009, you wrote: >Directions of travel for CNC machines use the convention of >how the cutting tool moves with respect to the workpiece. >For a machine with a moving XY table and a stationary >column holding the Z axis, and assuming the viewer is >standing so that the X axis runs left and right, then positive >X would happen when the table moves left. For other machine >configurations this will vary, but the convention holds that you >consider the motion of the cutting tool with respect to the >workpiece regardless of what part of the machine is moving. > >The convention for where Z axis is zero is less rigid. The more >common method is to have Z zero with the cutting tool as >far from the workpiece as possible. This helps the human to >remember that -Z means plunging into the cut. Often the >user sets offsets such that Z zero represents the top (or end, >if a lathe) surface of the workpiece. There are other ways of >doing this and it is a bit of a "religious" question. > >Steve Stallings > > > > -----Original Message----- > > From: [email protected] [mailto:[email protected]] > > Sent: Saturday, June 06, 2009 9:38 PM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] new pcb mill > > > > > > > > I am in process in setting up my little PCB mill. I have my > > self confused. > > > > I am using stepper conf to get started with. The 3 axis work > > fine under axis test. > > > > When I fire up EMC2 and run a small example program the Z > > axis only moves about 1/4 inch though in step conf I have it > > set for 3 inches and it travels the entire distance. > > > > > > > > My axis are 4 inches for both the X and Y axis and 3 inches > > for the Z axis. Do most of you set the Z axis so it's 0 or > > some positive number when raised fully and the goes to some > > negative number as its lowered onto the work surface? i.e. > > 0.00 - -3.250 I would like to stay with in convention. > > > > > > > > When in the home position, mechanical home uses a reamed hole > > on the work table, the X axis is almost all the way right to > > 1/4 inch of the end of travel. The gap to the far end is > > 4.075 inches > > > > > > > > When the X axis moves left would you consider it going > > positive or negative? > > > > > > > > Y axis moving towards the Z axis going positive? > > > > > > > > The Y axis in 13/16 inch away from being against the front > > end of travel. The other end of travel is 4.375 inches > > towards the Z axis. I am looking into installing some home > > switches on all 3 axises > > > > > > > > How did you come up with the original axis travel > > measurements? And what did you input into the. ini file for that? > > > > > > > > The stepper driver doesn't have much for specifications like > > some others do. They only specify step pulse of 5 uS and > > maximum step frequency of 40 kHz. The driver chip is an > > Allegro A3977 though some other specs can be had from their > > spec sheet.,however the BOB is using opto isolators or > > similar devices. The drivers and bob are probotix sidestep > > and their PBX-RF board. They seem to work ok I just want to > > set it up properly. The lead screw is 1/2 inch acme 10 TPI > > threads. Am using 260 oz in NEMA 23 motors.I did have a > > defective driver but Probotix took good care of me and > > exchanged it. :) Got it back yesterday. > > > > > > > > Looking around the Internet I come across many articles > > telling about software and settings. I have not discovered or > > don't know how to Google properly to find out how to take > > mechanical measurements to the software and make the thing do > > the circles etc I want it to do. > > > > > > > > Maybe someone knows of an article explaining all of this. > > > > > > > > Gary Fiber K8IZ > > > > -------------------------------------------------------------- > > ---------------- > > OpenSolaris 2009.06 is a cutting edge operating system for > > enterprises looking to deploy the next generation of Solaris > > that includes the latest innovations from Sun and the > > OpenSource community. Download a copy and enjoy capabilities > > such as Networking, Storage and Virtualization. > > Go to: http://p.sf.net/sfu/opensolaris-get > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > >------------------------------------------------------------------------------ >OpenSolaris 2009.06 is a cutting edge operating system for enterprises >looking to deploy the next generation of Solaris that includes the latest >innovations from Sun and the OpenSource community. Download a copy and >enjoy capabilities such as Networking, Storage and Virtualization. >Go to: http://p.sf.net/sfu/opensolaris-get >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users Gary Fiber K8IZ GROL PG-19-6691 Washington State Resident ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
