On Friday 08 July 2016 05:10:12 andy pugh wrote: > On 8 July 2016 at 00:42, Gregg Eshelman <[email protected]> wrote: > > Can Linux CNC work with this hardware? > > Not without effort. Probably more effort than it is worth.
Gregg; I would check with the vfd folks, but the one I have, and intend to it use on this Sheldon lathe I just bought, has analog inputs for both 10 and 5 volt range external pot controls. These inputs are quite well filtered and will accept the PWM output as a an analog control signal, so you'd only need the PWM and DIR outputs of the 5i25's PWMGEN to control the vfd. I have tested it with the vfd I have, a 1.5 HP rated single phase power source I got from a fleabay dealer. Works fine. You will have to use one of the GPIO pins for the enable signal if your vfd requires it, but thats not a problem as Jon's PWM-Servo amp also needs it so when I tested it, all I had to do was connect the 4 wires including the common ground. I normally use that to run the OEM 1HP in my G0704. This will not give you an accurate enough rpm feedback that the RS485 interface will to attempt rigid tapping, for that you will still need a shaft encoder. I have made and installed an optical encoder on the g0704. Other than the limited room and lack of a precision surface to mount it on, once installed & bolted down, its worked well for rigid tapping, I just did a 3/8"x24 hole in steel yesterday with it. Anybody that wants the code to carve the wheel, yelp and I'll make sure its on my web site in the sig. Carve it in .03125" thick brass from a sheet intended for a door kickplate. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
