Myford Dividing Head

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Myford Dividing Head

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  • #441269
    Jeff O’Neill
    Participant
      @jeffoneill14323

      Could someone with a dividing head for the Myford 7 send me dimensions of some parts (spindle diameters/length etc.) so I can make a similar one for my South Bend?

      Namely:

      Diameter of overhead support bar.

      All Diameters and Length for Spindle (Is it a #2 morse taper?)

      Dividing head shaft diameter/length.

      Distance between centers for support bar and spindle.

      Thanks!

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      #19558
      Jeff O’Neill
      Participant
        @jeffoneill14323

        Needing Dimensions

        #441277
        David Davies 8
        Participant
          @daviddavies8

          Jeff

          overhead bar 1" dia, 12" long

          spindle 6 1/2" long, 2mt, 9/16 through bored.

          maximum distance from spindle nose to overhead bar centre arm 6 1/2".

          i would have to strip the spindle to get all diameters, threads and keyway dimensions, suffice to say that the nose is a std Myford, then the main body, then a plain collar, 1 5/8 dia, a threaded collar with a locking grubscrew and pad 1 1/2" dia, the 60T gear and finally the second threaded collar,g/s & pad, 1 3/8" dia.

          plain collar 1/4" long, threaded collars 3/8" long.

          hth

          Dave

          PS body 3 5/32" long (well it is on mine!)

           

           

           

          Edited By David Davies 8 on 11/12/2019 22:12:22

          #441280
          Jeff O’Neill
          Participant
            @jeffoneill14323

            Thank you so much David! Could you clarify a bit?

            6.5" spindle – that's overall length?

            If so- what is the length/dia. of the spindle thread/thread base/wider boss? length of casting at spindle? What is the diameter of the spindle at the last threaded collar?

            6.5" maximum distance from spindle nose to overhead bar centre arm – Does that mean clearance (center of spindle to bar (add 1/2" for center to center distance?) What is the diameter of the 60t gear?

            #441284
            Hopper
            Participant
              @hopper

              If you want to make your own dividing head for a small lathe, it might be worth taking a look at GH Thomas's Versatile Dividing Head. Full drawings are in his book "Workshop Techniques". It appears to be a bit more robust and of course versatile than the Myford item. You can buy the castings and gears and worms from Hemmingway Kits or make your own. I fabricated the body from welded up steel sections and used a Myford 60 tooth change gear for the worm wheel and it works a treat. There was a series of articles in MEW last year about it. Worth a thought anyway.

              #441291
              Jeff O’Neill
              Participant
                @jeffoneill14323

                Thanks for the ideas! My use being watch wheels I am not too concerned about capacity. The Myford design would work well mounted to the milling attachment I already have.

                #441412
                David Davies 8
                Participant
                  @daviddavies8

                  Jeff

                  I took my DH to bits to check sizes etc. It was fortunate that I did as I found I had left the woodruff key out so the gear was only held by friction. Severe bo***king for that!

                  I have uploaded photos which should give you enough detail to make your own. The Myford spindle nose dimensions are given in several threads here.

                  However I have to agree with Hopper that the GHT VDH kit is a neater alternative plus the design allows for enhancement to permit differential dividing and can therefore be used to produce gearwheels with prime numbers of teeth.

                  HTH

                  Dave

                  #441415
                  Jeff O’Neill
                  Participant
                    @jeffoneill14323

                    David

                    That's perfect, thanks! Goodness that Thomas book is pricey.

                    #441422
                    David Davies 8
                    Participant
                      @daviddavies8

                      Jeff

                      The current edition of "Workshop Techniques" includes 'Dividing and Graduating' (£12.95 in '94) and 'Building the UPT', (£10 in the same year)so the price isn't so bad in my opinion. It's well worth a read.

                      Cheers

                      Dave

                      #441423
                      Jeff O’Neill
                      Participant
                        @jeffoneill14323

                        I didn't realize it was still in print. Went to Amazon and the only one listed is 94 USD (70 GBP) though I see now I can find it for less.

                        #441425
                        David Davies 8
                        Participant
                          @daviddavies8

                          £26.95 from Amazon UK and same price from TEE Publishing,

                          Just noticed a Boo Boo on the outer nut, I have written 1" x 18 but this should read 7/8" x 18.

                          Will revise photos.

                          More haste less speed!

                          #441434
                          thaiguzzi
                          Participant
                            @thaiguzzi
                            Posted by David Davies 8 on 12/12/2019 22:09:02:

                            Jeff

                            The current edition of "Workshop Techniques" includes 'Dividing and Graduating' (£12.95 in '94) and 'Building the UPT', (£10 in the same year)so the price isn't so bad in my opinion. It's well worth a read.

                            Cheers

                            Dave

                            +1.

                            Anything written by GHT is worth the money, and the education.

                            #441435
                            Hopper
                            Participant
                              @hopper

                              How are you going to make your indexing plates and drill all those holes in the right place? (800+ of them on the three plates for the Thomas dividing head! Not sure on the Myford?) Or do you have a rotary table etc already?

                              If you can't or don't want to make your own worm and wheel, they are available cheap these days on Aliexpress like this one here LINK

                              Edited By Hopper on 13/12/2019 09:46:01

                              #441443
                              Michael Gilligan
                              Participant
                                @michaelgilligan61133
                                Posted by Hopper on 13/12/2019 09:41:45:

                                How are you going to make your indexing plates and drill all those holes in the right place? (800+ of them on the three plates for the Thomas dividing head! Not sure on the Myford?) Or do you have a rotary table etc already?

                                […]

                                .

                                I’ve just had a look at this page: **LINK**

                                https://www.myford.co.uk/acatalog/Myford_Dividing_Head_and_Plates.html

                                That makes Tony Jeffree’s DivisionMaster [or one of the subsequent homages] look like a bargain buy !!

                                MichaelG.

                                #441452
                                Hopper
                                Participant
                                  @hopper

                                  Youch. But it's not the plate that costs the money, it's all those holes. Not only do you have to drill the 812 of them, but then you have to chamfer each one — on both sides! And then if you have perfectionist tendencies as some of us do, you have to deburr the outer edge of each chamfer just gently.

                                  But the fun of trepanning a 4" disc out of a square of 1/4" steel plate makes it all worthwhile! One of the more exciting things I've done in the lathe. Just like parting off a 4" diameter, only on a curve.

                                   

                                  Edited By Hopper on 13/12/2019 11:58:17

                                  #441473
                                  Michael Gilligan
                                  Participant
                                    @michaelgilligan61133
                                    Posted by Hopper on 13/12/2019 11:51:54:

                                    Youch. But it's not the plate that costs the money, it's all those holes. […]

                                    .

                                    Very true

                                    But with a DivisionMaster and a stepper motor, you need neither the plates nor the holes 

                                    MichaelG. angel

                                    Edited By Michael Gilligan on 13/12/2019 13:51:29

                                    #441483
                                    Jeff O’Neill
                                    Participant
                                      @jeffoneill14323

                                      I am going to adapt a set of these: **LINK**

                                      #441508
                                      John Hinkley
                                      Participant
                                        @johnhinkley26699

                                        Or, if you don't live in the U.S. and/or have deep pockets and short arms , try these identical ones from Chronos at £48.

                                        Dividing plate set

                                        John

                                        (Just a satisfied customer.)

                                        #441554
                                        Hopper
                                        Participant
                                          @hopper

                                          Hoho. At those prices it's not worth making your own – unless you particularly like drilling small holes. Smart move.

                                          Does the HV4/6 use a 60 or 90 tooth wormwheel? And I wonder if you can buy them as spare parts and use them in a dividing head?

                                          The reason I ask is I have obtained very cheaply a set of castings to make a second GH Thomas dividing head and to fit my "new" Myford lathe. The first, fabricated, one I made was to fit the old Drummond lathe with a different centre height. Would be nice to avoid robbing the plates etc off the old one to make the new one.

                                          #441559
                                          Jeff O’Neill
                                          Participant
                                            @jeffoneill14323

                                            HV6 is a 90:1 ratio (haven’t seen individual parts for the rotary table). Plate holes- Plate A- 15, 16, 17, 18, 19, 20, Plate B- 21, 23, 27, 29, 31, 33 Plate C- 37, 39, 41, 47, 49

                                            #441561
                                            Hopper
                                            Participant
                                              @hopper

                                              Thanks. Looks like I could use something like this Worm Gear

                                              At $28 for what looks like two steel worms and two 90T worm wheels in bronze it's cheaper than I could buy the bronze material locally.

                                              On my first dividing head, I used a 60T Myford change gear with a modified profile worm to fit. Works ok but point contact only. A proper worm wheel would be luxury for Mark 2.

                                              Then I'd have to build a rotary table just to use the extra worm gear in the set above.

                                              Edited By Hopper on 14/12/2019 03:10:35

                                              #441571
                                              Michael Gilligan
                                              Participant
                                                @michaelgilligan61133

                                                Have you worked out exactly what they mean by the description, Hopper ?

                                                I’m guessing that the 50mm is the outside diameter of the wheel.

                                                …and that they are playing safe with the tolerance[!]

                                                MichaelG.

                                                .

                                                [quote]

                                                Easy to clean and store
                                                Tooth Profile: Ram Gear
                                                Shape: Worm
                                                Processing: Precision Casting
                                                Model Number: 1M 90T
                                                colour: gold+silver
                                                Material:stainless steel
                                                size:50mm
                                                Package Contents:
                                                2 x Worm gear
                                                Only the above package content, other products are not included.
                                                Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

                                                [/quote]

                                                #441616
                                                Hopper
                                                Participant
                                                  @hopper

                                                  Translating the Chinglish can be a challenge. I think 50mm is the ID, the hole in the middle. Because a 90T Mod 1 gear (assuming that 1M in the description means Module 1) would be 92mm. So could be a bit large. But found this other one that is module .8 that is 72mm OD that would fit the space better LINK

                                                  Getting more exy at $50 but probably plenty more to chose from with a bit of searching around.

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