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  • #175405
    jason udall
    Participant
      @jasonudall57142

      This is not going to include any functional printed parts..

      Ball screws and recirculating linear slides..

      Think machine tool build

      But at 400mm cube (600 mm throw)..it might need a bit better motions eh?

      Plan is to run build area at upto 200C…that should improve lamination and reduce

      shrinkage skew. ..

      Edited By jason udall on 09/01/2015 21:07:59

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      #175414
      Michael Gilligan
      Participant
        @michaelgilligan61133
        Posted by Neil Wyatt on 09/01/2015 20:34:45:

        > For my pennance, here is a link to one implementation of an Allegro device.

        £18 to cover conversion from SMT to DIL (retrograde step if you ask me) and add four resistors and a capacitor!

        .

        Neil,

        " … one implementation … "

        I was citing it as an example, not doing a Value for Money analysis.

        MichaelG.

        #177052
        Neil Wyatt
        Moderator
          @neilwyatt

          Having bought five of those stepper boards I'm still to try one out. Realised I have no idea of he pinout… so did a bit of digging.

          They are clones of the Pololou board, and if you want to know the pinouts and much more look HERE

          Neil

          #177083
          jason udall
          Participant
            @jasonudall57142

            Neil..and others. .
            Have a care when setting up some of the polou clones. .for example stepstick..the voltage vs coil current is not always the same..( reference resistor differs thus current/voltage ratio)…definitely get the right procedure for the boards YOU have…

            #177115
            Neil Wyatt
            Moderator
              @neilwyatt

              Thanks Jason,

              Last night I found this page:

              **LINK**

              It points out that the standard board uses a resistor that give a maximum current of over 4A!

              Mine is the same as the one in the picture (note the ghastly new coding system where 30C means 20K!) I'll follow the advice in the 'upgrade' section and swap in a 100K resistor, as my stepper is rated at 24V/800mA.

              Neil

              #177120
              Les Jones 1
              Participant
                @lesjones1

                Hi Neil,
                Thanks for pointing out the new SMD resistor coding system. This is the first I have heard about it so I "Googled" it. I assume you meant to say 30C means 30K (Or 20C mens 20K)

                Les.

                #177123
                Russell Eberhardt
                Participant
                  @russelleberhardt48058
                  Posted by jason udall on 09/01/2015 21:02:35:

                  This is not going to include any functional printed parts..

                  Ball screws and recirculating linear slides..

                  Think machine tool build

                  But at 400mm cube (600 mm throw)..it might need a bit better motions eh?

                  Plan is to run build area at upto 200C…that should improve lamination and reduce

                  shrinkage skew. ..

                  Edited By jason udall on 09/01/2015 21:07:59

                  Sounds as if this should make an interesting article or build thread in the 3D printing section.

                  Russell.

                  #177138
                  Neil Wyatt
                  Moderator
                    @neilwyatt

                    Hi Les,

                    No the new 1% system is really odd. 30 stands for 200(!) and C stands for x 100 so 30C means 20K.

                    Essentially you will have to keep the chart handy and perhaps memorise a few common ones.

                    Neil

                    #177142
                    Les Jones 1
                    Participant
                      @lesjones1

                      Hi Neil,
                      I should have read the document I found properly rather than just skimming through it. Although it seems illogical it does reduce the number of characters reqired to identify the ever smaller components.

                      Les.

                      #177155
                      Neil Wyatt
                      Moderator
                        @neilwyatt

                        Who would have though you would need a loupe to do electronics, thirty years ago!

                        Neil

                        #177160
                        Muzzer
                        Participant
                          @muzzer

                          I see that NYC CNC has posted a set of videos recently covering the use of Arduinos with the GRBL "shield"(yuk) to make a simple CNC machine. Well presented intro and real world example. Possibly quite timely for this thread.

                          Murray

                          #177191
                          jason udall
                          Participant
                            @jasonudall57142

                            Who would have though you would need a loupe. ..not just me then…
                            Didn’t expect to need the dissecting ‘scope for electronics

                            #177192
                            jason udall
                            Participant
                              @jasonudall57142

                              Russell. .that thought has crossed my mind..but this is for a customer. .though with permission maybe.

                              #177200
                              Neil Wyatt
                              Moderator
                                @neilwyatt

                                "Shield" is bad. Beaglebone has 'capes'. Raspberry Pi has 'Hats' but the RPi based Pi-top goes one better and has 'Pi-Top hats'.

                                In my day you got an 'expansion board' and were happy!

                                Neil

                                #177207
                                jason udall
                                Participant
                                  @jasonudall57142

                                  Shield..pun ..board usually sits above arduino…but is specifically shielding the arduino from “real world signals and levels”…
                                  The other names are just continuing the ( week) joke.
                                  Ignor it . It might go away

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