Sorry, Chris, your first link doesn't work (not found) and the second requires registration with dropbox or google. Not for me. Peter
Am 26.09.2016 05:45, schrieb Chris Albertson: > I've started work on a motorized indexer for my rotary table. At this > point I am not calling this a fourth axis. The way this will be used is to > (1) rotate the table, (2) clamp it down, (3) perform the drill or mill > operation (4) unlock) then if not finished go to #1. > > A fourth axis would required more mechanical precision. I plan to drive > the table only on one direction and clamp down the clamps when cutting. > It should work well for making bolt circles and the like. > > Later I can see if my low-cost table can be used for more. > > The project adds a stepper motor to replace the crank because I am not good > at counting or finding holes on an index plate. The motor connects via > direct drive to a a worm that drives a 72 tooth wheel. I can micro step at > about 8:1. This gives me about 0.0001" of resolution at the edge of the > table and a lot more near the enter. > > For your amusement here is a photo of the controller electronics, computer > and all working on my electronics bench. The user interface is a rotrary > knob that you can "push to select" and there is a small LCD for a display. > https://www.dropbox.com/...ElectBenchTest01.jpg > <https://www.dropbox.com/s/rlyhhmjvr2qm88f/IndexerElectBenchTest01.jpg?dl=0> > > The little 8-bit computer can drive the stepper at almost 10,000 steps per > second. The steps have 105 uSec period with only a few tens of nanoseconds > variation. I'm currently using a 12 volt plug-in power cube to power the > stepper. > > QUESTION: Before I get further along, within the limits of this hardware > what features would be good to include? The memory has tons more room for > software and many unused pins on the Arduino. I wonder if I missed any > useful features? > > 1) selectable units, either degrees/minutes/seconds or fraction of a circle > 2) A physical button to set the zero point > 3) A physical "step" button to move to the next point > 4) can set the step size with rotary dial > 5) controls lock out automatically when it does not make sense to use them > to avoid accidental activation > 6) A fine motion mode where the table moves 1 second of arc per click of > the rotary dial, for fine tuning the zero point > 7) the display will show the current position and the step size in > selectable units > > > Is there anything I missed? > > PS. This is only tangentially related to LinuxCNC, connection to that > comes later. Another project I want to do is to add a replica of the > physical hand wheels that go on a manual machine tool. It would be self > contained not using a PC. Likely just three wheels with one of those small > LCDs above each one to serve as a digital readout. Basically what you see > in that photo times three. > --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
