On Thursday 20 August 2009, jon doe wrote: >Yes on this particular machine an extra para port is possible, but I will > not gain the ability to count the encoders I have as fast or as reliable > as I would like. Finding how fast the audrino can count would be cool, as > that would make for a very low cost expansion running off serial port. > >Like I said I am working on /planning 3 machines. > >The harbor freight 8x14 lathe is sitting on bench with a baldor 3 phases > motor and an allen bradley VFD on the spindle. It has been like this for a > while.(year) I have rudementry counter encoder and index pulse generator > on it. > >The seacond is a harbor freight 4x5 mini micro lathe. This has the dc > spindle motor. I thought I had the right pulleys to get the z axis set up > but one of them is not going to work. I also had a AMC servo drive I > would of liked to have used on the spindle but it was a can only > interface, but it has nice fets in it for salvageing.
That mills Z axis is best redesigned from the ground up. Having the drive screw behind the post is a terrible idea as it binds the z gibs badly. I gave up, modified the head by rotating it 90 degrees ccw on the spindle, and that left room to put the drive screw in front of the post. With a 425 motor on the Z, I went from a max pressure or under 10 lbs on a drill bit, to 155 lbs on a drill bit. To see how I did it, maybe you can do better yet, at: <http://gene.homelinux.net:85/gene/emc> Obviously I have also replaced the table and base with the larger versions from LittleMachineShop.com, so I have about a 5y,10.5x,12z envelope now. I also added a pmdx-106 spindle motor interface and moved the motor controller from the head into a project box with the pmdx-106. That keeps the flying grease from attempts to lube the head gears from wrecking the electronics. The fuse holder in particular will fall apart in about a year. My head still has the original gears though.:) >By not learning in this case I was actually referring to learning about the > h bridge and driving it, specifically, but also in general about fpga and > such. I am not a great inovator as much as an awsome immitator. so as such > I am adding alot of bits I'v seen from other projects. I threw money at that, and have a 4 axis xylotex setup with mixed motors( 2 kits, the first was a 3 axis). They work well. >The milling machine (you guessed it harbor freight) has been semi enclosed > and still fully manual. As you can see, I haven't gotten around to the enclosure stage yet. >I see a long road ahead, but the journey should be grand, if the > destination a little anti-climatic. Yes, mucho fun. And impresses the heck outta the neighborhood frogs. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> There are three things I always forget. Names, faces -- the third I can't remember. -- Italo Svevo ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
