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    Robotdigg Rails

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    • Mysta
      Mysta last edited by

      How well do the robotdigg rails work for those that have used them? I believe you used them for yours dc42? Wondering if it's worth converting my 4040 1.5m verticals to 2040+rail.

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      • Dougal1957
        Dougal1957 last edited by

        I use the Robotdigg Stainless rails on mine (Same as DC's I think) and they are very good and not stupidly priced either.

        think they are the 440SUS ones mine are 750 long.

        Doug

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        • T3P3Tony
          T3P3Tony administrators last edited by T3P3Tony

          The robotdigg rails have been working well in my delta (copy of David's) they are very slightly louder than Delrin wheels but the fan noise eclipses all that.

          Can you not stick with 4040 and use the rails?

          www.duet3d.com

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          • Dougal1957
            Dougal1957 last edited by

            Not if it is the Openbuilds rails as they have 2 slots in each face

            T3P3Tony 1 Reply Last reply Reply Quote 0
            • T3P3Tony
              T3P3Tony administrators @Dougal1957 last edited by

              @dougal1957 I suppose if you pick one slot and use tnuts then the rails will be off center from the motors and the pulleys... Or an interface is needed which is.mkre work than going to 4020.. yeah

              www.duet3d.com

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              • Dougal1957
                Dougal1957 last edited by

                Yep that's very true Tony

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                • Mysta
                  Mysta last edited by

                  Yeah I've tried so hard to find a good way to use rails on 4040 but most of the ways I could think of leave more room for error than just sticking with delrin. Has anyone seen noticeable improvement with the rails over standard v slot delrin?

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                  • dc42
                    dc42 administrators last edited by dc42

                    Why not bolt rails to your 4040 extrusions? The rails will be slightly off centre, but apart from a small change in the maximum sideways angle of the arms in one direction (which I don't think will matter at all if you use Haydn's magnetic joints), I don't think it will affect the kinematics - as long as you bolt the rails on the same side of each extrusion, either all to the left, or all to the right.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

                    T3P3Tony 1 Reply Last reply Reply Quote 0
                    • T3P3Tony
                      T3P3Tony administrators @dc42 last edited by T3P3Tony

                      @dc42 I guess because the motor and idler mounts will then be offset by ~10mm?

                      www.duet3d.com

                      dc42 1 Reply Last reply Reply Quote 0
                      • dc42
                        dc42 administrators @T3P3Tony last edited by

                        @t3p3tony said in Robotdigg Rails:

                        @dc42 I guess because the motor and idler mounts will then be offset by ~10mm?

                        That's a very good point, I hadn't thought of it!

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

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                        • Mysta
                          Mysta last edited by Mysta

                          Yeah, and given the varying standards/types of the rails it's hard to find one that has 2 sets of screws 20mm apart and also a block with a 20mm square set of holes.

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                          • kraegar
                            kraegar last edited by

                            I've gotten their rails a few times. They're hit and miss. I've gotten some bent. I've gotten some filled with sludge instead of oil. Most have been usable after a tear down and re-build of the carriages, and polishing the rail itself. (Only one was too bent to bother trying to save)

                            Co-Creator of the RailcoreII CoreXY printer
                            https://www.thingiverse.com/thing:2407174

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                            • number40fan
                              number40fan last edited by

                              I could see some spacers made from acrylic and a laser cutter. Would you have the room to move the carriages ~15mm closer to the bed?

                              Mysta 1 Reply Last reply Reply Quote 0
                              • Mysta
                                Mysta last edited by

                                This post is deleted!
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                                • Mysta
                                  Mysta @number40fan last edited by

                                  @number40fan what do you mean?

                                  number40fan 1 Reply Last reply Reply Quote 0
                                  • number40fan
                                    number40fan @Mysta last edited by

                                    @mysta 0_1523426293444_horriblepic.jpg

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                                    • number40fan
                                      number40fan last edited by

                                      If I was on my other computer I could draw you a better picture, but hopefully you get the idea.

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                                      • number40fan
                                        number40fan last edited by

                                        Can't figure out how to edit my posts, but needing to move the carriages closer will really depend on how your setup is now.

                                        Mysta 1 Reply Last reply Reply Quote 0
                                        • Mysta
                                          Mysta @number40fan last edited by Mysta

                                          @number40fan Yeah I get where you're going, though at that point you could almost just use it as a jig to drill holes in the center really. But introducing potential for error either way. I think at that point I'd rather just buy 2040, vertex and new linear rails. The only real alternative is parallel rails which I'm not sure there's anything that would work in this scenario.

                                          Btw what are the 'best' linear rails from robotdigg? I know they said they can do custom lengths.

                                          Dougal1957 number40fan 2 Replies Last reply Reply Quote 0
                                          • Dougal1957
                                            Dougal1957 @Mysta last edited by

                                            @mysta said in Robotdigg Rails:

                                            @number40fan Yeah I get where you're going, though at that point you could almost just use it as a jig to drill holes in the center really. But introducing potential for error either way. I think at that point I'd rather just buy 2040, vertex and new linear rails. The only real alternative is parallel rails which I'm not sure there's anything that would work in this scenario.

                                            Btw what are the 'best' linear rails from robotdigg? I know they said they can do custom lengths.

                                            The std steel ones can vary in Quality like most Chinese Clones but all the Stainless ones that I know about no-one has said there bad!

                                            Such as these MGN12-1500 ones in SUS440C

                                            They may even do double width ones so you could alway ask Derek what he can do for you?

                                            Doug

                                            Mysta 1 Reply Last reply Reply Quote 0
                                            • Mysta
                                              Mysta @Dougal1957 last edited by

                                              @dougal1957 Thanks I'll ask. I do like the idea of a 4040 with rails. And my current setup prob has a little more weight on the carriage than I'd like.

                                              DADIY 1 Reply Last reply Reply Quote 0
                                              • number40fan
                                                number40fan @Mysta last edited by number40fan

                                                Whatever you used to make the spacers, you would have a little wiggle room, just like you would with T-nuts in an aluminum extrusion. The linear rail would be stiff enough to help align everything vertically if you loosely assembled the spacers first.

                                                Even with the best made extrusions, you are not guaranteed to not have a slight bend/twist in them.

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                                                • DADIY
                                                  DADIY @Mysta last edited by

                                                  @mysta Will be interesting to see if they have them in stock, every time Ive ordered from them they've not had them, and other sellers on Ali took the order and then asked for more money, which I refused.

                                                  Mysta 1 Reply Last reply Reply Quote 0
                                                  • Mysta
                                                    Mysta @DADIY last edited by

                                                    @dadiy For what, the 440C?

                                                    DADIY 1 Reply Last reply Reply Quote 0
                                                    • DADIY
                                                      DADIY @Mysta last edited by

                                                      @mysta they didn't have anything in the 1.5m lengths even though they were advertised, hopefully that's changed now, please let us know if you go for it.

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