hypoid gear rotary table free sample

Guangdong Saini Intelligent Equipment Technology Co,Ltd. is a professional manufacturer integrated with production, R & D and sales for more than 10 years in China. We supply high precision hollow rotary actuator, harmonic drive gearboxes, high precision planetary gearboxes, 90 degree gearboxes ( for servo motors and stepper motors), right angle hollow reducer, high precision alignment platform, etc.

Cameron rotary tables range from 27 1/2 in to 60 1/2 in and feature a large oil capacity that adds to the unit"s durability. The rotary table includes a forged-steel fabricated housing and a heat-treated forged-steel turntable. Each rotary table is supplied with spiral-bevel, induction-hardened gears and two independent ratchet-type locks, with lever access from the top to lock the table in position.

Hosea provides a diversity of Hypoid gear rotary tables for customers to choose from, our Hypoid gear rotary tables with stable index accuracy and high transmission efficiency. Moreover, they are easy to adjust. Please feel free to contact us as you are interested in our products detail!

Machine tools are often provided with a rotary table on which the workpiece to be machined is mounted. In the case of a known gear cutting machine (cf. e.g. the Klingelnberg company prospectus "Universal-Spiralkegelrad-Walzfrasmaschinen" KNC 40/KNC 60", no. 1329/D/GF) the rotary table bears a headstock for the workpiece and is mounted on a movable slide on the machine base. The workpiece can be rotated with the workpiece headstock about a workpiece axis (usually referred to as the B axis), the rotary table can be swivelled about a workpiece swivel axis (usually referred to as the C axis) and the slide can be slid along a workpiece positioning axis (usually referred to as the Y axis).

In the case of the known gear cutting machine, these adjustable axes are CNC controlled and each is provided with its own drive (cf. the above-mentioned company prospectus, p. 6 and 7). To simplify matters, the rotary table, spindle etc. about whose axes of rotation a controlled drive movement is to take place, are simply referred to as axes of rotation. Axes of rotation with play-free drives are required in bevel gear cutting machines as well as spur gear cutting machines.

By virtue of the fact that they are able to perform modified generating movements--also non-linear movements--of the tool relative to the workpiece, these CNC controlled gear cutting machines make it possible to obtain highly specific tooth geometries.

In many cases it will be necessary to run through a reversal of the direction of rotation of individual axes of rotation during the generating process. Such "zero passages" in the gear cutting process place extremely high demands on the automatic control of the respective CNC axis of rotation and on the entire machine structure. It is necessary for the workpiece and tool to be mounted and driven free from play so that these zero passages as well as the effect of external forces or forces resulting from the work process influence the set positions and the programmed movements of workpiece and tool as little as possible.

It is impossible to obtain a drive free from play with traditional gearing systems since known tooth designs always have a certain minimum tooth clearance in connection with the reversal of rotation if they do not possess additional devices. It is true that special tooth geometries, e.g. those of bevel gears and hypoid gears, are more suitable for play-free drive than normal spur gears are (Niemann, "Maschinenelemente", volume II, P. 366, publishers: Springer Verlag 1989), however a high drive torque is necessary when flank clearance is small and the flank clearance often needs to be readjusted due to the inevitable wear that results where there is little clearance. In order to permanently ensure a play-free drive of an axis of rotation also in the case of zero passages and under the influence of operational forces, there are a number of familiar alternatives which are described e.g. in DE 43 31 042 A1.

One of these alternatives is a drive via at least one gearwheel on the axis of rotation, with the simultaneous initiation of a compensating moment. The torque acting upon the axis of rotation is superposed by a second retroactive torque which means that flank contact only ever takes place on one side. The disadvantage of this alternative is the danger of disturbing torque arising during operation and acting on the axis of rotation, which will counteract the compensating moment. This would then result in a loss of the freedom from play.

A further alternative described in DE 43 31 042 A1 is to provide a rotary table with two separate drive systems with their own source of power. The additional drive system can have a decelerating or an accelerating effect depending on the case in question, or its direction may also be reversible in order to suppress the existing drive play. The disadvantage is the low efficiency, caused by losses in conversion, transmission and slip, the complicated construction of pre-loads required to suppress the drive play and the high costs involved. In the case of the play-free rotary table drive of a machine tool as described in DE 43 31 042 A1, a multiple-stage transmission with several intermediate shafts is employed to avoid the above mentioned disadvantages. By means of axial shifting of at least one intermediate shaft, the flanks of the toothing of the intermediate shafts can be brought into contact in mutually opposed directions thus rendering the power transmission free from play. Multiple-stage transmissions such as this are not always practicable. Especially in the case of machine tools with CNC control, it is much simpler and more accurate to act upon the drive systems of the axes of rotation instead of attempting to influence the control system by way of the transmission.

It is an object of the present invention is to improve such a device in such as way that it allows the play-free rotary movement of a rotary table or the like about a machine axis in a predeterminable angular segment in a simple and repeatable manner without the above described disadvantages.

According to the present invention, a play-free device is provided for driving a rotary table or the like about an axis of rotation. The device may be employed, for example, in a gear cutting machine, where two separate drive systems are provided. The first drive system is adapted to bring the rotary table into starting position in a predeterminable angular segment. The second drive system has a linear drive to effect the actual operating movement of the rotary table within the predeterminable angular segment, and only this drive system is inherently free from play. To ascertain an actual angle of rotation of the rotary table independent of the drive system in operation at any one time, a rotary measuring system is mounted in the axis of rotation of the rotary table, and is connected to a CNC control.

Due to the fact that according to the present invention the actual drive system of the machine axis, i.e. of the rotary table or the like is only employed for the starting positioning point in a predeterminable angular segment and a linear drive is used as an additional drive system to generate the actual machining motion within the predeterminable angular segment, one avoids the above mentioned disadvantages which are associated with the prior art use of separate drive systems to suppress drive play. The device according to the present invention enables play-free rotary movement about a machine axis in any desired angular segment.

If, as according to a further embodiment of the invention, the linear drive can be coupled to the rotary table free from play by means of a clamping system it is possible in a simple manner to roughly position the rotary table with the first drive system and subsequently, after actuation of the clamping system, to move without play the rotary table within the predeterminable angular segment with the linear drive.

If, as according to a further embodiment of the invention, the linear drive is coupled rigidly to the rotary table by the clamping system and is designed such that it is able to perform radial and angular compensatory movements, use can be made of a clamping system which, due to its being of the rigid type, is of simple design but nevertheless sufficiently reliable.

If, as according to a further embodiment of the invention, two play-free pre-loaded joints are provided for the compensatory movement of the linear drive, about which or in which the linear drive is moveable, fault-free kinematic movements are possible despite the linear drive being rigidly coupled to the rotary table.

If, as according to a further embodiment of the invention, the play-free pre-loaded joints are revolute joints, in which the linear drive is linked to the clamping system or a slide upon which the rotary table is mounted, the required radial and angular compensatory movements of the linear drive are possible free from play in a simple and safe manner.

If, as according to a further embodiment of the invention, the first drive system is provided with a drive motor which is rigidly attached to the rotary table and which is equipped with a pinion which meshes with a gearwheel mounted on the slide, this drive system--which is usually the only one provided but is not free from play--can be used as a simple means to roughly position the rotary table.

If, as according to a further embodiment of the invention, the linear drive is composed of a play-free pre-loaded ball-and-screw spindle mechanism and a CNC (Computer Numerical Control) controlled servomotor connected thereto, the necessary machining motion of the rotary table can be effected very accurately by means of the linear drive.

If, as according to a further embodiment of the invention, the CNC controlled servomotor can be switched to a separate drive train to position the rotary table in its starting position, the other drive motor is not required and the starting positioning can be controlled in a much more versatile manner.

FIG. 1 depicts the construction of a rotary table 2 of a CNC bevel gear cutting machine--erected on a support member shown to be a a casing or slide 1. A workpiece headstock 4 is mounted on the rotary table 2. While the gears are being cut, the workpiece headstock 4 is placed in a starting position shown in FIG. 1 by turning the rotary table 2 about its axis C relative to the slide. For this, as shown in FIG. 1 of a first embodiment of a device according to the present invention for the play-free drive of the rotary table 2 about its axis C, a first drive system 3 is provided comprising a drive motor 3"--which is anchored to the rotary table 2 and which has a pinion 3"--and a hollow wheel 6 which is mounted on the slide 1 and the toothing of which meshes with the pinion 3".

To ascertain the actual or current angle of rotation of the rotary table 2, a rotary measuring system 5 is provided in the axis C. Depending upon the machining job, the rotary table 2 must perform a CNC controlled rotary movement C" with the highest accuracy possible. This movement can assume either positive or negative directions in a cycle as dictated by the process, i.e. "zero passages" may result for the CNC axis of rotation, i.e. in the rotary movement of the CNC controlled rotary table. In order to perform the rotary movement of the rotary table 2 with sufficient precision and free from play, a second drive system 8 is provided according to the present invention in addition to the first drive system 3 of the rotary table 2 to take over the actual machining motion. After positioning the rotary table 2 in the starting position, the first drive system 3 is switched off. The second drive system 8 is coupled rigidly and free from play to the rotary table 2 by means of the clamping system 7.

It has a linear drive 11 which in this embodiment is composed of a servomotor 12, a ball-and-screw spindle mechanism 11" and a spindle nut 11" and drives the rotary table 2 by means of CNC control. The current angle of rotation of the rotary table 2 is ascertained by the rotary measuring system 5. The clamping piece 7" of the clamping system 7 can be coupled at one end to the rotary table 2 by an actuator 7" and is connected at the other end to the spindle nut 11" such that it can be swivelled about the axis of a rotary joint X". The ball-and-screw spindle mechanism 11" is pivoted in a bracket rigidly connected to the slide 1 such that it can swivel about the axis of a rotary joint X". The complete linear drive 11 is pre-loaded so that it is free from play or clearance. Because it is rigidly coupled to the rotary table 2, the linear drive is required to carry out radial and angular compensatory movements. In the first embodiment, shown in FIG. 1 of the device according to the present invention, this problem is solved by means of the two play-free pre-loaded rotary joints X" and X".

FIG. 2 shows a second embodiment of the device according to the present invention in which the necessary compensatory movements are rendered possible by a rotary joint X" and a translatory joint X"", which are also pre-loaded so that they are free from play or clearance.

Other solutions, for example switching over the CNC controlled servomotor to a separate drive train to place the rotary table in starting position and thereby making the other drive motor unnecessary, are possible but not described in greater detail.

Saini Intelligent provides wide ranges of Hollow Raotay Table and their Combination Axis. We provide the following Hollow Rotary Table and its combination.

For some application, the bigger gear ratio are needed, it can be achieved by combination of Hollow Rotary Table with Planetary Reducer or Right Angle Gearbox. Below is a combination list for different gear ratio.

The Hollow Rotary Table could be applied for many application like Rotating Platform, Laser Marking machine, Gyro Test, Gravity Sensor Test, Electronic Compass Test of mobile phone and other precise electronic product. It also can used for robot arm joint, automation production line, testing device, laser cutting, etc.

M-035 series high precision rotary tables rotation stages feature high resolution, excellent repeatability and minimum wobble. These high performance rotational positioning stages are equipped with double ball bearings for minimum backlash and high load capacity. Both the rotation stage platform and the scale ring (graduated in 2-degree increments) can be independently coarse positioned over 360 degrees and then be locked by screws.

The basic rotary table version, M-035.D0, is equipped with a DC servo motor drive providing a positioning range of ± 6.3 degrees. A set of limit switches eliminates the possibility of overtravel. For the highest precision and highest performance, high speed air bearing rotary tables are recommended.

The DGII Series is a line of of products that combine a high rigidity hollow rotary table with an AlphaStep closed loop stepper motor and driver package. It retains the ease of use of a stepper motor, while also allowing for highly accurate positioning of large inertia loads.

The gear-reduction mechanism employs precision gears along with a proprietary adjustment mechanism that eliminates backlash. The repetitive positioning accuracy from a single direction is ±15 sec., while lost motion in a positioning operation from two directions is 2 arc minutes. These characteristics make the DGII series the ideal choice for applications in which accurate positioning is a must.

American Block offers a complete line of drilling rotary tables that range from 17 ½ to 60 ½ . These tables are designed to withstand the harshest drilling conditions. All rotary tables feature a fabricated frame, heavy duty main thrust bearing and precision machined spiral bevel gear that results in superior strength, toughness and durability.

American Block can also provide unitized rotary table assemblies (IRD). Our unitized skid packages are ideal for new builds or can be retrofitted to existing rigs. Featuring a heavy-duty oilfield skid and an extend life transmission. The rugged design ensures that when the equipment is mounted it remains rigid during operation and rig moves. Other rotary table options include hydraulically operated tables and high torque tables (25% more torque), which are ideally suited for top drive operation.

This post shows what I did to add a stepper motor indexed drive to an EMCO 150mm Rotary table, and how I added a "Grip-True" style adjustment to the attachable 125mm 3-Jaw and 5C chucks.

From the various ELS systems I did for my and other"s lathes, grew a gear hobber software suite, even though I do not have or own a Hobber...Then someone else became keen to be part of the project, and so my good Wife again did all the software and is now nagging me for a test-bed..And so it starts..

I decided to follow MichaelG"s route of using a rotary table as the gear blank active axis, and began modifying my rotary table. The main reason for the test bed requirement is that it is very difficult to test the software in simulation as far as accelerations are concerned.

This is an issue when doing continuous hobbing, as the blank has to spin up synchronised to the hob, when starting and stopping the hob spindle. If the inertial mass and friction exceeds the steppers capability, steps are lost and sync as well, with gear teeth misaligned. Some electronic hobbers have very little blank holder inertial mass to spin, while using a rotary table is probably the most mass you could apply..

The Worm stub external to the table is short and of not a very practical shape to attach the stepper - I decide to go for belt drive as even with a NEMA23 stepper, if the stepper shaft were aligned with the worm drive, the stepper body would protrude about 16mm below the underside of the table"s base.

That makes it difficult when placing the table on the bench, mill table, etc - spacers are needed and so on. I made an adaptor for the pulley, which includes a shaft preload to remove worm shaft end-play.