dividing head vs rotary table in stock

Rotary tables are mounted horizontally, and most can also be mounted vertically. In both cases only at 90° to the mill table. A Dividing Head is always vertical, but can be tilted through 90°.

Dividing heads are always fitted with "indexing plates" (holed wheels and clock hands), allowing a wide range of angles to be turned. The indexing mechanism can do intermediate angles. Rotary tables can be fitted with indexing plates as an accessory, but usually the number of angles supported is limited compared to a dividing head. (A generalisation. And, because rotary tables do all common angles, the limitation may not matter.)

Rotary tables are more convenient for general work because most jobs are mounted at 90° or 180° relative to the milling table. Possibly more robust than a dividing head for rough work. When close accuracy isn"t needed, jobs can be spun rapidly by the rotary table without cranking the handle - a time saver. When accuracy is needed the handle and worm are engaged. Usually there"s a vernier scale sufficiently accurate for most work. The handle is also relatively fast because most simple angles can be produced with it. For example, easy to crank from 0, 60, 120, 180, 240, 300, 0 to cut a hexagon head. Unfortunately not all angles are "simple"!

Indexing plates are so awkward that driving a Rotary Table with a stepper motor and microcontroller is popular. You simply tell the controller how many divisions are needed, press "Go", and the computer does the rest. Apart from reducing brain strain and automating a tedious task, the computer eliminates most mistakes. Computers don"t get sums wrong, have excellent memories, and are hard to distract! Also, a computer and stepper motor will do a good job of angles too complicated for the Indexing plates.

Generalising again, I suggest most people, most of the time, only need a rotary table. I see Dividing Heads as specialist tools and have never felt the need for one. For the same reason I drive an ordinary small car rather than a Land Rover. The closest I get to off-road driving is a supermarket car park! You might live on a farm...

Unless there"s a specific reason for needing a Dividing Head, I wouldn"t spend money on one. My rotary table is used a lot, in contrast a Dividing Head is only "nice to have".

Dividing heads allow you to divide a circle into equal fractions conveniently. Anything that involves regular action around a circle is a candidate for a dividing head.

A rotary table has no stops so it is not convenient to do large numbers of things at equal intervals because you would have to painstakingly determine the interval. Also, the rotary table does not divide the circle. For example, if you were making 13 equally spaced operations using a rotary table you would have to calculate some wierd angle for each operation and dial it in--a tedious process. For example, here are the 13 angles for a circle division:

Do you want to manually set each of these values? Have fun doing that. Now, imagine doing it for 53 divisions. You will be there all night. Not only that, the error will be a lot more than a dividing head.

I have used it in the vertical position to cut a 107 tooth gear which isn"t covered by any of the dividing head wheels I"ve got. I set up an excel spreadsheet with the angle required for each tooth which isn"t as easy as it sounds as the rotary table is calibrated in degrees/minutes/seconds rather than decimal degrees so it took a bit of figuring out how to do it.

I have an 8" Rutland horizontal/vertical RT made in Taiwan that is about all I want to carry around without mechanical help. It has done all I ask of it, and a larger fixture plate mounted to the top of the table could be up to any diameter I care to make it. It is a high quality RT, and I am happy with it. Just went out and weighed it on a bathroom scale, said ~55 pounds. I also recently picked up a beautiful old adjustable height tailstock for it. It is also very heavy and solid, maybe 25 pounds.

I also have a 6" swing dividing head (no maker"s mark, WWII?) with two sets of three dividing plates, two D.E. Whiton 1-3/4" 8 tpi mount chucks (3 and 4 jaw, also marked Rivett!}, and #9 B&S spindle tooling for it as well, and a mill mounting table adapter plate that holds the dividing head and the tailstock to it for quick mounting to the mill table. Throw it on the mill, tighten 4 bolts, and it is ready to use, with less than .001" tolerance fit everywhere.

Given the choice between dividing head and rotary table, I vote for both! The jobs they do are mostly quite different, and one does not work for the other very well. In a pinch, yes, it can be done.

These days it"s pretty trivial to create a spreadsheet to figure out the required degrees/minutes/seconds for some arbitrary number of divisions n, so it"s not all that big a deal to use a rotary table for dividing. A dividing head is, as others say, probably a bit more convenient both in ease of dividing oddball numbers of divisions and in less mass to get in the way of what you"re machining...but a rotary table will be more flexible. If you want to substitute for a dividing head, be sure to get a horizontal/vertical rotary table, as you"ll want "vertical" mode for dividing (and making gears).

If the rotary table has a Morse #3 center hole (or whatever), in vertical mode you could probably use Morse taper collets for workholding, which might be pretty handy. The only thing is, as hinted above, in vertical mode there may be a lot of rotary table in the way of what you"re trying to machine, if you need to get in close. It"s do-able, but you may to need to be a bit creative in workholding to arrange necessary clearance to get the tool where you need it.

This plate can be used either directly, or through a geared dividing mechanism. In direct indexing the workpiece and plate rotate in a 1-to-1 ratio, and holes are used directly. That is, a plate with 12 holes can divide the workpiece into 2, 3, 4, 6, or 12 equal segments. A dividing head incorporates an internal gear ratio (usually 40:1, 60:1, or 90:1) with the same plates. In doing so, the dividing head enables many more combinations than just direct indexing.

For example, imagine a plate with 15 equally-spaced holes and a dividing head with a 40:1 gear reduction. In direct indexing, a workpiece could be divided into 3, 5, or 15 equal segments. Using the dividing head, the same workpiece could be divided into 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 25, 30, 40, 50, 60, 75, 100, 120, 150, 200, 300, or 600 segments. Essentially, the dividing head acts as if it’s a direct indexer with 600 holes; 15 holes in the actual plate * 40:1 gear ratio. Let’s look at how some of these combinations are possible.

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The indexing head doesn"t only look great, but allow you to do more with your milling machine: measuring specific angles and dividing a circle into equidistant arcs. It comes with 3 interchangeable indexing plates and a tailstock to ensure more precise and stable work. It will be your perfect assistant to machine the flutes of a milling cutter, cut the teeth of a gear, mill curved slots, or drill a bolt hole circle around the circumference of a part.

The indexing head features a long service life due to its rigid quality. It is designed with a mirror finish that resists wear and tear and looks low-profile.

The dividing head is enabled to tilt from 10° below horizontal to 90° vertical. And that will be convenient if you want to cut the part from a certain angle.

The high precision performance of the indexing head is achieved with indirect indexing plates A, B, and C. All divisions 2-50 can be done, but some from 51 to 380 cannot be obtained. Check the manual before setting.

Precision rotary table tiltable type UT300, precision rotary table can be used horizontally and vertically, for milling, drilling, grinding and marking work.

1 pair of prismatic blocks without clamping brackets, suitable for clamping round material, prismatic incision 90°, made of special cast iron, supplied in pairs

Universal dividing head, HOMGE, type BS-2, incl. tailstock, flange and 3 dividing discs, as milling machine accessories for direct and indirect dividing.

Clamping tables, swivelling ±45 degrees in both directions, with rotating plate rotatable through 360°, type HAP, with reinforced construction in special cast iron.

Precision rotary tables HOMGE type HHV, universal dividing head for milling, drilling, boring, grinding and marking work, for horizontal and vertical use.

Semi universal dividing head ZENTRA, type HUT, with indexing plate with 24 holes for direct dividing, including tailstock, flange and 2 dividing plates.

ZENTRA precision rotary table RT with a gear ratio of 90:1 / for milling, drilling, boring, grinding and marking work is horizontally and vertically versatile.

Precision rotary table dividing head ZENTRA type RT-DF, mounted lathe chuck for milling, drilling, boring, grinding, scribing work, for horizontal and vertical use.

Direct dividing attachment Zentra TA, for direct dividing including three-jaw lathe chuck and indexing disks as milling machine accessories ✅ order now!

Zentra dividing head with handwheel and three-jaw lathe chuck, clamping disk and indexing plates, for horizontal / vertical use as milling machine accessories.

ZENTRA indexing disks for precision rotary tables type TS for the production of precise, indirect graduations as for example in gear milling ✅ buy now!

Universal dividing head ZENTRA VUT-200KPL, incl. lathe chuck, tailstock, turning and drilling jaws and 2 dividing discs, for direct and indirect dividing.

Universal dividing head, ZENTRA, type VUT-2A, incl. tailstock, flange and 2 dividing discs as milling machine accessories for direct and indirect dividing.