cutting gears with a rotary table made in china

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Say you want to cut a 51-tooth gear, or 51 splines, or evenly space 51 holes on a bolt circle: 360/51 gives 7.05882 degrees, or 7 degrees, 3 minutes, 31.8 seconds - and your rotab measures to (f"rinstance) 1/10 of a degree - tricky to get it right!

you rummage through your dividing plates, looking for something with a common factor with 51 - its factors are 17 and 3, so you want a multiple of 17 (the 3 is a factor of 72 so that"s covered already) and you find a plate with a 34 hole circle ( 2 x 17) and fit that;

The table"s ratio is 72, and you"ve used the factor of 3 in it, leaving a factor of 24 - into the pot and multiply by the 2, giving 48 holes "but I"ve only got 34 holes!" you cry!

48 holes is a full turn plus another 14 holes, so set the dividing sector arms with 14 SPACES between them - the first hole counts as 0 as you haven"t moved from it, so you"ll have 15 HOLES between the arms, then bring the "lagging" arm up to the detent pin, take a full turn and the fraction to the "leading" arm - you"ve done 48 spaces, exactly what you want! now make your cut, move the sector arms around again, take a full turn and a bit, next cut etc. etc. etc.

Because you"re mechanically DIVIDING rather than guessing using the dial on the handle, your cuts will be in exactly the right places (important for gears or dials!) - if you don"t have the right plates you can do much the same to make "em, each time you go through the dividing process the accuracy will improve:

Say you need a 50-hole plate (maybe making a dial for a tailstock handwheel), 50 isn"t in the set of plates, nor 25... So you make a rough plate (old CDs work well

This is pretty much how the first dividing plates (and, incidentally, threads) were made, repeated division of the errors, and why we don"t need a "master plate" in a national standards lab" somewhere to compare our divisions against

The way that I was taught is that you have to make up a test bar. Take a piece of 12" by 1" roundbar, drill two centre holes in it"s ends, on your lathe and take a parallel cut between centres. Once you have corrected the error of your lathe and both ends of the test bar measure the same diameter, you can then use the test bar in your milling machine as well, to set the tailstock of the dividing head as well as the alignment of the bar to the table axis.

My first rotab was a Wholesale Tool 6 inch. I was turning a 12 inch wheel center (had to weld it up to make it 12.25 dia) on the rotab with a large roughing endmill in the spindle while rotating the rotab (my lathe swing dia is 12.2 inches w/o locally grinding a divot into the lathe bed (partially into the tailstock way) - not that the tailstock would ever be that close to the chuck - I just did not want to be that much of a hack so I used the mill and rotab). I ended up shearing teeth on the ring gear in the rotab. Had I used a less aggressive cut, maybe roughed in the shape with a hand grinder before machining the rotab probably would have survived. Finished turning the wheel center at work during my lunch time (with the blessing of the guys in the machine/fab shop) on a 20 inch swing lathe - I"ve never operated a lathe that big and the pucker facter was high!

Now I have a PhaseII 6 inch rotab but have not had need to abuse it like I did the Wholesale Tool rotab. I still have the damaged rotab - figured I might make some sort of a tool out of it someday (4 yrs later still have not figured out what I might use it for).

For my needs an 8 inch rotab would probably be more durable but with a 6 inch 3-jaw attached to the 6 inch rotab, its at the weight limit that I can comfortably lift.

I"ve had it for maybe 22 years now and have found it to be quite accurate and reliable. I"ve made some changes: all of the belt guards were removed years ago so I could construct a speed reducer. I"ve used it most recently to adapt some parts to my weird motorized bike and to make some large bushings for some clock or other.

The mill works better than I had expected. I think the last mill project I had was to duplicate the "jaw" of a movement post: the brass one had stripped out, so I replaced it with a steel one, salvaging the steel from a trash-can axle. As on any machine tool you have to expect some flexing, and so light cuts are helpful if you"re dealing with anything but aluminum. I don"t think I can use any but the smallest and simplest rotary table-thing (with or without chuck) given the space constraints.

I"ve been threatening to buy a four-jaw independent chuck for this machine since I"ve owned it, but thus far the 3-jaw self-centering scroll chuck that came with it has proven just fine.

While my humble Grizzly won"t do everything (say, left-handed threads or thick workpieces) it will do a great deal, well beyond my feeble abilities as a machinist. In high school I learned machining on a very nice South Bend ten-inch engine lathe, and I find that I make precisely the same errors on the Grizzly that I did on the noble South Bend. I imagine that the mill would be great for bushing a clock plate, but the Grizzly lives in the garage and I work in our dining room with my creaky drill press, bench vise, and an arbor press residing in our adjacent home office.

I ordered a 6 inch from Busy Bee a few years back but it was complete junk. The pinion gear had some broken teeth after a few uses. I admit I am slightly ham fisted at times however I was really disappointed in the quality.

In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.

Please refer to Fig. 2, Fig. 3, Fig. 4, Fig. 2 is the structural representation of a kind of specific embodiment of fan-shaped static pressure rotary table provided by the present invention; Fig. 3 is the partial enlarged drawing at centre of gyration position among Fig. 2; Fig. 4 is the partial enlarged drawing at Fig. 2 center platen position.

In a kind of specific embodiment, fan-shaped static pressure rotary table provided by the invention mainly is made of parts such as slide unit 1, pressing plate 2, workpiece casing 4 and big friction wheels 5.

Big friction wheel 5 is screwed in slide unit 1 upper surface, between slide unit 1 and the big friction wheel 5 pressing plate 2 is housed, pressing plate 2 is screwed in workpiece casing 4 lower surfaces, form between the upper surface of pressing plate 2 and the big friction wheel 5 and go up surface of friction pair, form surface of friction pair down between the lower surface of pressing plate 2 and the slide unit 1, last surface of friction pair is provided with upper oil cavitie 2-1, and following surface of friction pair is provided with lower oil cavitie 2-2, and the area of lower oil cavitie 2-2 is greater than upper oil cavitie 2-1.

The quantity of upper oil cavitie 2-1 and lower oil cavitie 2-2 is respectively two, wherein two upper oil cavitie 2-1 are opened in the upper surface of pressing plate 2, area is less relatively, two lower oil cavitie 2-2 are opened in the lower surface of pressing plate 2, area is relatively large, and each oil pocket is provided with independent oil-feed oil circuit 6 and oil return circuit 7, the external pressure oil pipe (not shown) of oil circuit, every pressure oil pipe all is equipped with Pressure gauge, can independent oil transportation and adjustment oil pressure.

Particularly, the oil-feed oil circuit 6 of each oil pocket is opened in pressing plate 2, and the side of pressing plate 2 is provided with corresponding oil-in 6-1, and the oil return circuit 7 of each oil pocket is opened in slide unit 1, and the side of slide unit 1 is provided with corresponding oil return opening 7-1.

When the upper oil cavitie 2-1 of pressing plate 2 and the logical oil of lower oil cavitie 2-2, difference in areas according to oil pocket, can form a power that makes progress at above-below direction, weight in order to supporting workpiece casing 4, simultaneously produce certain thickness oil film rapidly at surface of friction pair up and down, reach the purpose of the lubricated surface of revolution, effectively avoided the direct contact between pressing plate 2 and big friction wheel 5, pressing plate 2 and the slide unit 1, realize not having the friction operation, increased precision and the stability of workpiece casing 4 greatly.

This static pressure rotary table adopts constant current fuel feeding principle, and each oil pocket can be adjusted fuel delivery respectively according to different load, thereby reaches the balance of pressure between each oil pocket.When workpiece casing 4(or panoramic table) be subjected to cutting external force and do the time spent, gap one end of pressing plate 2 both ends of the surface diminishes and causes that pressure becomes big, and other end gap becomes and causes that greatly pressure diminishes, and reaches new balance thereby produce pressure differential and suffered external force.Because the minor variations in oil pocket gap can cause the marked change of pressure, so this static pressure organization plan has high rigidity.

Be further to improve turnability, the centre of gyration of slide unit 1 is provided with a recessed round portion, and its inner plug-in mounting also fixedly has bearing block 8 by screw, and the gyroaxis of workpiece casing 4 passes through turntable bearing 9 and is connected with bearing block 8, is the work centre of gyration with the bearing centre.After centre of gyration structure improved and adopting turntable bearing 9, the rigidity at central supported place has bigger lifting, and assembly process process and precision stability are good.

Because not re-using unloading roller comes supporting workpiece casing 4, therefore need not to offer the unloading roller installing hole at panoramic table, workpiece casing 4 and panoramic table can be designed to integral structure.

Please refer to Fig. 5, Fig. 6, Fig. 5 is the stereogram of fan-shaped static pressure rotary table shown in Figure 2; Fig. 6 is the structural representation of rotary motion mechanism.

As shown in the figure, the rotary motion mechanism of fan-shaped static pressure rotary table mainly is made of parts such as wheel carrier 10, bearing 11, friction wheel 12 and motors 13.

Bearing 11 is fixed on workpiece casing 4(or panoramic table) lower surface, wheel carrier 10 1 ends insert in the bearing 11, form thrust oil pocket 14 between its end face and the bearing 11, two inner peripheral surfaces up and down of wheel carrier 10 other ends and friction are taken turns two outer circumference surfaces of 12 upper and lower sides and are connected by two zanjon single-row ball-bearings 15, during work, in thrust oil pocket 14, lead to oil, the pressure that produces promotes wheel carrier 10 and moves to big friction wheel 5 together with the wheel of the friction on it 12, i.e. A direction shown in the figure, make the outer circumference surface of friction wheel 12 be close to the outer circumference surface of big friction wheel 5, motor 13 drives friction wheel 12 by reduction box and shaft coupling and rotates, and drives workpiece casing 4 by the frictional force between friction wheel 12 and the big friction wheel 5 again and does gyration.

Above-mentioned fan-shaped static pressure rotary table only is preferred version of the present invention, specifically is not limited thereto, and can make pointed adjustment according to actual needs on this basis, thereby obtains different embodiments.For example, upper oil cavitie and lower oil cavitie are opened in respectively on big friction wheel 5 and the slide unit 1, perhaps big friction wheel 5 and slide unit 1 are designed to integral structure, or oil-feed oil circuit and oil return circuit together are opened on pressing plate 2 or the slide unit 1 etc.Because mode in the cards is more, just illustrate no longer one by one here.

Except above-mentioned fan-shaped static pressure rotary table, the present invention also provides a kind of gear cutting machine, comprises machine tool main body and rotary table, and described rotary table is fan-shaped static pressure rotary table mentioned above, all the other structures please refer to prior art, and this paper repeats no more.

Be specifically as follows the numerical-control milling and grinding gear cutting machine, owing to adopted above-mentioned fan-shaped static pressure rotary table, therefore can significantly improve the machining accuracy of spiral bevel gear.

More than fan-shaped static pressure rotary table provided by the present invention and gear cutting machine are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.

Specifications Top Quality 304 Stainless steel for feeding bottle Dia 100cm Accumulative rotary table Standard diameter100cm, customized size available Top Quality 304 Stainless steel for feeding bottle Dia 100cm Accumulative rotary table Accumulative table& rotary table standard size diameter100cm, customized size is available Variable speed drive Material: SS201,SS304,SS316 Useage:for collecting bottle or bags. Top Quality 304 Stainless steel for feeding bottle Dia 100cm Accumulative rotary table Top Quality 304 Stainless steel for feeding bottle Dia 100cm Accumulative rotary table

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The SV type are designed specially for servo motor gearbox for motion control applications. It takes full advantage of the flexibility of the servo motor, giving designers greater freedom of mechanism design.

It is a brand-new kind of rotating load device. Incorporating high transmission efficiency, high precision, high rigidity, and high cost performance, it combines the advantages of the servo motor and DD motor, obtaining a balance between these three products.

The adoption of the top spiral bevel gear and the optimized design of contact tooth surface makes the even load and allow high torque output. When it combined with planetary reducer or right angle reducer, the gear ratio shall become bigger up to 1:180.

Equipped with the servo motor, it can make segments at any angle, which can meet the digit control that the cam indexer cannot achieve. The positioning accuracy is comparable with the direct drive motor which can realize the positioning of the inertia load in a short time.

The equipment table and robot arm can be directly mounted on the output table of Rotary Table. It can save the time and cost for mechanical design, parts allocation, belt debugging, etc., which compared with the use of mechanical parts such as pulleys and belt.

Wiring and piping are more convenient and simple, and the advantages of this feature are particularly prominent in complicated wiring and piping environments.

Applied for many application like CNC Indexing Device, Military Radar, Gravity Sensor Test, Electronic Compass Test of mobile phone and other precise electronic product. It also can used for robot arm joints, testing device, laser cutting, etc.