Chris -- At my house, computers are all over the place. I think I have a spare atom floating around. Also a couple of other machines. Gene -- The grinder is here. <https://drive.google.com/file/d/1L8JiX0rtDZO99rVnQKNjUH7m-ZgFz2Un/view?usp=sharing> The ways look pretty clean. The only accessory I have is a magnetic chuck.
I don't really need a surface grinder, but no shop is complete without one. Once I started to use it, I realized that my right arm and shoulder really aren't suited to this type of manual work. The longitudinal travel is just over a foot, and it takes about 3-1/2 turns of the crank to go that distance. I'm thinking around a second per turn would be about the maximum. So, that's 60 RPM. I'm thinking of a 1:6 ratio on the timing belt pulleys, so that's 360 RPM at the stepper which is pretty slow. A full stepping rate would be 200 * 360/60 => 200 * 6 which is only 1200 steps per second. An alternative would be to provide more gearing, but I don't think it's practical to get more than about a six to one ratio in a single belt reduction and I'd like to avoid mechanical complexity if I can. Thoughts? Ken Kenneth Lerman 55 Main Street Newtown, CT 06470 On Fri, Feb 4, 2022 at 7:13 AM Chris Albertson <albertson.ch...@gmail.com> wrote: > If looking for lowest cost solution you can us the old "Atom" computer to > control the grinder as long as you do not need to run the mill and > grider at the same time. Get an Eiternet interface Mesa card for the new > machine, You need two config files, just load the one for the mill or the > one for the grinder. > > Then someday you buy a second computer you only have to move the Ethernet > cable over. The best option is a newer version of the Atom. They seem to > sell for just under $200. Finally Newegg.com always has many used oe > refurb PCs Used PCs sourced locally can be a cheap as "free" > > But 9ld PCs tend to burn up a lot of power. I am trying to get mone to do > "wake on LAN" so it can not use power until I need to log onto it > > On Thu, Feb 3, 2022 at 6:52 PM Kenneth Lerman <ler...@se-ltd.com> wrote: > > > I'm considering converting a surface grinder to CNC. To start, I'll > > probably just convert the longitudinal and transverse axes. > > > > I'll go with steppers for this -- I'm thinking NEMA-42 motors. > > > > My current Bridgeport clone uses servos and Jon Elson's hardware on a > > little Intel Atom Box. I'm thinking of using a Rpi for this. It will > need a > > minimal display/control panel when completed, but initially will need a > > display with touchscreen or mouse and possibly a keyboard. In the long > run, > > some buttons. and perhaps an mpg might be useful. > > > > I'd like to use a raw Rpi without adding special hardware directly. That > > probably means using a USB or ethernet interface to control the steppers. > > I'm thinking of using Mesa hardware. > > > > Can someone suggest the most cost effective way to do this? (Although I > > have to admit, that after buying the timing belts and pulleys, the > > steppers, power supply, stepper drivers, ..., it's too late to be really > > cost effective.). And the surface grinder only cost me $300. > > > > Thanks, > > Ken > > > > > > > > Kenneth Lerman > > 55 Main Street > > Newtown, CT 06470 > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
