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  • OT Rotab indexing

    Not sure if it was this site or an other, some one had posted a site where if you put in the number of spaces it would give you the coordinates in degrees , minutes and seconds cumulative . I think the site was from Canada could really use it. I only have a rotary table at home.
    Last edited by duckman; 03-22-2017, 08:37 PM.

  • #2
    Are you sure it's not one of Marv klotz utilities, it sounds like something he would come up with.

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    • #3
      Originally posted by Robin R View Post
      Are you sure it's not one of Marv klotz utilities, it sounds like something he would come up with.
      Look here:

      http://www.myvirtualnetwork.com/mklotz/

      Scroll down to a file called "Rotary.zip" and download that. It does the calculations for you and prints out a list you can take to the mill with you.

      Other great stuff there. If you don't know how to run a DOS program on whatever operating system you are using, MAKE SURE that you read the intro at the top of that page!!! It will help explain how to get these programs to run for you.

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      • #4
        This is it (bottom of page), Degrees-Min. only. Adding seconds would divide a circle into 1,296,000 divisions and that would make your brains leak out your ears. It is limited to 6400 steps, if you need more steps let me know and I can alter it. You have to download and install it on your 'Puter it will not run on the website.

        There are two spreadsheets. One for indexing (Indexing Converter for Rotary Tables) and a second one (Bevel Gear Indexing Converter for Rotary Tables), for indexing three rotations around a gear blank, to cut bevel and miter gears.

        Https://sites.google.com/site/bluewatermes/downloads
        Last edited by loose nut; 03-23-2017, 10:13 AM.
        The shortest distance between two points is a circle of infinite diameter.

        Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

        Southwestern Ontario. Canada

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        • #5
          As Robin and Alan said, the program you want is in ROTARY.

          If you have difficulty using DOSBox to run DOS programs, email me with the number of divisions you need and I'll run it locally and send you the resulting file.
          Regards, Marv

          Home Shop Freeware - Tools for People Who Build Things
          http://www.myvirtualnetwork.com/mklotz

          Location: LA, CA, USA

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          • #6
            I have a simple web page that gives exactly this, for any number of divisions given, and shortly after I put that together I turned it into a quick and dirty native android app so I could use it on my smartphone during manual dividing operations. I never bothered putting it in the store because I figured most people probably already used other machining phone apps that gave the same functionality, so without knowing if there was any interest I wasn't going to spend the money to open up an account to be able to publish to the store.

            If anyone wants the app to install through "untrusted sources", I'll happily provide it (PM through the forums is probably the best way to let me know). If there's enough interest I'd consider paying the $20 or whatever it is to be able to publish it to the app store.

            -Max
            Max
            http://joyofprecision.com/

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            • #7
              http://www.engineersedge.com/calculators.htm

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              • #8
                Thanks guys went to all the sites none have the program that I'd seen bluewater needs office to open I don't have it, engineersedge doesn't use degrees and minutes. Guess I need to keep looking.

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                • #9
                  Duckman, if you have a tablet or phone (Ipad or Iphone for sure. Android or any MS device should work) you can download the MS Office Excel App for free and run the spreadsheets on them. You can also run it on the Google office apps for free or if you use Bing you can sign up to use Excel on line for free. It should work OK on Open Office or one of the other open source spreadsheet programs that are compatible with Excel. It might format a bit differently.
                  Last edited by loose nut; 03-23-2017, 10:12 PM.
                  The shortest distance between two points is a circle of infinite diameter.

                  Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                  Southwestern Ontario. Canada

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                  • #10
                    This is the fork that is still being developed. 100% free.

                    https://www.libreoffice.org/download/download/

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                    • #11
                      FWIW, anyone running linux can use Marv's utilities under dos emulator, or "dosemu". It's in most repositories. Simple to run--I just keep the utils in a folder in the home directory. Open the folder, find the appropriate exe, right-click, open with dos emulator. Thanks Marv!

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                      • #12
                        OK I found it was the blue water site and then found the reason it wouldn't work I don't have Office and you need office to open it, so looks like ISOOL.

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                        • #13
                          Most spreadsheet programs should open it. See above, post 9.
                          The shortest distance between two points is a circle of infinite diameter.

                          Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                          Southwestern Ontario. Canada

                          Comment


                          • #14
                            Duckman, it works for me using firefox in Linux.

                            Go to https://sites.google.com/site/bluewa...xing-converter. Enable javascript for google.com. Click on the link at the bottom. For me that was https://drive.google.com/file/d/0B4R...ew?usp=sharing but that may be dynamically created.

                            Once you click on that it will bring up an example with 25 steps of 14 degrees. At the top is a box to "Open with gooogle sheets" Click on that and you get on online spreadsheet program with the XLS spreadsheet loaded. THAT is where you can change the number of steps. No need for MS Office.
                            At the end of the project, there is a profound difference between spare parts and left over parts.

                            Location: SF East Bay.

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                            • #15
                              Most rotary tables can be fitted with indexing plates, just like the ones used on indexing heads. I plan to do this for mine when I get the chance.

                              If you are worried about making accurate hole circles, it can be easily done in any shop using only the rotary table itself. The worm gear in the table acts like an accuracy amplifier when making hole circles so you can start out with a very, VERY inaccurate one and two generations later have one that is as accurate as your rotary table itself is. You can do it like this:

                              For each number of holes you need in a circle:

                              1. Mark out a circle and divide it by HAND. Do it as accurately as you can without taking too much time but don't worry about accuracy at this point. If each hole is +/- as much as one degree, you will be just fine. They do not even have to be evenly spaced. Drill those holes.

                              2. Use that rough, 1st generation plate to make a second generation plate. Now each hole on that plate will be 40 or 90 times more accurate due to the division by the worm gear. So, +/- 1/40 or 1/90 of a degree. Take a moderate amount of care in making this plate.

                              3. Finally use the second generation plate to make a final, third generation. At this point you want to be very careful. Watch backlash at all times. This third generation plate will again be 40 or 90 times more accurate than the second generation one. So it will be +/- 1/1600 or 1/8100 of a degree. That translates to 2.25 arc seconds or 0.44 arc seconds. Unless you have a really expensive rotary table, it will not be that accurate. Mine is specified as +/- 30 arc seconds and reads to the nearest 10 arc seconds.

                              Since they will only be used once, for making the third and final plate and each hole will only be used once; the first and second generation plates can be made with aluminum or plastic. You could even use plywood for the first generation plate. I would use a good steel alloy for the third generation plate.
                              Paul A.
                              SE Texas

                              And if you look REAL close at an analog signal,
                              You will find that it has discrete steps.

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