Re pendant. The heidenhain controls use a box with strong magnets on rear. Between the magnets is a deadman switch (suitably runner dome covered for industrial use ) You can slap it onto any flat surface and the deaman is satisfied. You can hold it in your hand,,, left hand... thumb on left side, left forefinger on button, remaining fingers on right side. On the front are keys and any lcd. On right is an estop and a deeply dimpled wheel to turn an encoder for motion. You put a fingertip in a dimple and lay a finger on the outside ribs, the ribs give you a ergonomic detent very natural to use. You can jog and handwheel as you like IF the deadman is satisfied. hth tomp
On Mon, Jun 8, 2020 at 11:02 AM Chris Albertson <albertson.ch...@gmail.com> wrote: > > I am going to have JLPCB make some PCBs for me. They cost only $2 each but > DHL shipping from China is $25 so it makes sense to wait until I have > several projects ready and give then a batch of designs. They populate the > board now for the price of the components, so it is a great deal. They do > all the SMT soldering for you. > > Two things might interest people here, a USB connected pendant and a > hardware switch debouncer. > > The switch debouncer will handle 6 switches, it accepts a raw switch and > outputs a reliably debounced signal. It will use an RC lowpass filter and > a 74HC014 Schmitt trigger. With an LED for each switch. Yes, you can do > the debounce in software but this will handle the noise with hardware. I'm > still deciding about connectors. Screw terminals or JST? Or both. > > The pendant is more complex and I'm not sure of the details but here are > proposed features: > > - It will connect with USB. > - There are three knobs. All are of the continuous rotation type with > A/B quadrature output. > - The main knob is a CNC "MPG" handwheel with 100 "clicks" per > revolution. > - The other two are much smaller with about 20 clicks per > revolution and also a push-button click operation, like on a car radio. > These two knobs replace the more common selector switches. > - There is a character-only LCD screen that can display four lines of > text, 20 characters long > - There are no labels printed on the front panel. The current function > of the two small knobs is displayed on the last line of the LCD > > The goal is first off a "clean look" with both low complexity and > open-ended design. I think using a character display and rotary controls > does this. This pendant could run a 6 axis robot arm or a lathe depending > on the programming. > > *One question: Does a pendant need a "activate" button* on the side such > that the controls are disabled if you don't hold the button down. You > don't want to jog a mill by accident if the wheel is bumped. > > I'm making this for myself but I'm designing this as if it were an actual > product. So I ask "What would be useful? > > I've decided I don't like the idea of a standard red E-Stop button because > someone might confuse it with the hard-wired kind. USB can not support > that. But I do want a way to quickly stop the machine. I think pressing > both small knobs at the same time will stop and re-set everything. It will > set the e-stop hal pin and reset the pendant to default. (Yes e-stop could > fail if there is a bug in the software) > > [image: Simple Pendant v2.jpg] > > > > > > > > > Chris Albertson > Redondo Beach, California > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
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