The advantage of internal ball circulation nut is that the outer diameter is smaller than that of external ball circulation nut. Hence it is suitable for the machine with limit space for Ballscrew installation.
It is strictly required that there is at least one end of screw shaft with complete threads. Also the rest area next to this complete thread must be with smaller diameter than the nominal diameter of the screw shaft.
Above are required for easy assembling the ballnut onto the screw shaft.
It is important for a high-lead ballscrew to be with characteristics of high rigidity, low noise and thermal control. PMI takes its patented design and treatments to achieve the following characteristics:
Max. DN Value: 220,000
The average and accurate ball circle diameter (BCD) through whole threads make the ballscrews to obtain the stable and consistent drag torque as well as to reduce the noise. The audio frequency is low and deep due to the designed of plastic circulation system.
The ballnut diameter reduces 20%~25% substantially and the length of nut is shorter. The total space shall be reduced to approximately 50% consequently.
The specially designed pathway of the Recirculation System makes a contact with lead angle and also with BCD in the same tangency, improving its smoothness eff ectively.
Applications
There are two types of Ballnut of the external circulation Ballscrews. They are the "immersion type" of A and the "extrusive type" of B. The "immersion type" means the ball circulation tubes inside the circular surface of Ballnut, as shown on the specifications of this catalog, are of "immersion type."
In some cases, as per designs on customer's drawings, there are smaller outer diameter ball nuts required. Then the ball circulation tubes shall extrude out of the Ball nut circular surface.
It is important for a High-lead Ballscrew to be with characteristics of high rigidity, low noise and thermal control. PMI's designs and treatments are taken for the following:
The DN value can be 130,000 in a normal case. For some special cases, for example, in a fixed ends case, the DN value can be as high as 140,000. Please contact our engineers for this special application.
PMI's High-speed Ballscrews provide 100 m/min and even higher traverse speed for machine tools for high-performance cutting.
Both the screw and ball nut are surface hardened to a specific hardness and case depth to maintain high rigidity and durability. Multiple thread starts are available to make more steel balls loaded in the ball nut for higher rigidity and durability.
The special design of ball circulation tubes offers smooth ball circulation inside the ball nut. It also makes a safe ball fast, running into the tubes without damaging their tubes. Accurate ball circle diameter (BCD) through whole threads for consistent drag torque and low noise.
TYPE-S SERIES: Optimum design of recirculation path can absorb noise from impact of balls to reduce noise level 5~10 dB, comparing with general series.
The materials of recirculation structure made from composite materials will keep low audio frequency and supple.
The recirculation path adapts tangency design that reduces impact force form balls, for the reason that the vibration of nut is smoothly.
CNC Machinery / General Machines / Semi-conductor Equipments
The back system is designed by the front and rear ends of cycle paths, with the nut on the through-hole as the ball back, so that all nuts are covered with bead groove ball so effectively in the same length under the nut, end plugs nuts than the outer cycle nut with higher dynamic loads.
Focused on improvements of contact points of balls and thread grooves, ball diameter and circulation system for the new type, FSVH. The rated dynamic load has been increased to as two times that of the conventional type, FSVC.
The structure of the newly developed circulation system is designed to distribute the load uniformly to the load balls, and it also increases the life of ballscrews.
In a conventional circulation system, FSVC, the returning tube is inserted into the holes on the ball nut perpendicularly, which forms an advancing angle.
While the ball moves into the returning tube, it will hit the tube end area and then move into the returning tube. New circulation system, FSVH, the ball will move into the returning tube smoothly by tangent line in the same direction as the lead angle. It can increase the life of the circulation system structure.
For precision Miniature Ballscrew, PMI has reduced the Diameter of the ball nut and used the special circulation system to satisfy more stability and high precision requirement.
External circulation system, it doesn't need to have at least one end with complete thread to the end of Ballscrew for Ballnut assembly to screw shaft. And the special design of ball nut, so the size of ball nut is same as internal circulation system of ball nut, Space saving.
By way of 3D Spline designed a pathway for circulation system, and has enhanced the smooth circulation of ball, that can reduce the wearing and increase the life of ballscrew.
Semiconductor equipments / Measuring devices / Inspection equipments / Nano-platform
The production of the PMI rolled ballscrews has adopted a manufacturing process and equipment, unlike other manufacturers. Combining advanced skills and the Bad Düben digital electric screw thread rolling machine, we adhere to a strict quality control policy at every stage of production, from the selection of ballscrew material and rolled processing to induction hardening heat treatment and post-production. We are committed to providing clients with products of the best quality.
The combination of rolled ballscrews and ground nuts has replaced the traditional ACME screws and trapezoidal screws. This makes for a smoother operation while lowering friction and backlash. Moreover, the new technology has the advantage of faster production speed and lower prices.
Besides differences in the definition of lead deviation and geometric tolerance, rolled and ground ballscrews can both eliminate axial play by preloading. Please contact us for related technical information.
Features
The production of the PMI rolled ballscrews has adopted a manufacturing process and equipment, unlike other manufacturers. Combining advanced skills and the Bad Düben digital electric screw thread rolling machine, we adhere to a strict quality control policy at every stage of production, from the selection of ballscrew material and rolled processing to induction hardening heat treatment and post-production. We are committed to providing clients with products of the best quality.
The combination of rolled ballscrews and ground nuts has replaced the traditional ACME screws and trapezoidal screws. This makes for a smoother operation while lowering friction and backlash. Moreover, the new technology has the advantage of faster production speed and lower prices.
Besides differences in the definition of lead deviation and geometric tolerance, rolled and ground ballscrews can both eliminate axial play by preloading. Please contact us for related technical information.
Features
The production of the PMI rolled ballscrews has adopted a manufacturing process and equipment, unlike other manufacturers. Combining advanced skills and the Bad Düben digital electric screw thread rolling machine, we adhere to a strict quality control policy at every stage of production, from the selection of ballscrew material and rolled processing to induction hardening heat treatment and post-production. We are committed to providing clients with products of the best quality.
The combination of rolled ballscrews and ground nuts has replaced the traditional ACME screws and trapezoidal screws. This makes for a smoother operation while lowering friction and backlash. Moreover, the new technology has the advantage of faster production speed and lower prices.
Besides differences in the definition of lead deviation and geometric tolerance, rolled and ground ballscrews can both eliminate axial play by preloading. Please contact us for related technical information.
Features
The production of the PMI rolled ballscrews has adopted a manufacturing process and equipment, unlike other manufacturers. Combining advanced skills and the Bad Düben digital electric screw thread rolling machine, we adhere to a strict quality control policy at every stage of production, from the selection of ballscrew material and rolled processing to induction hardening heat treatment and post-production. We are committed to providing clients with products of the best quality.
The combination of rolled ballscrews and ground nuts has replaced the traditional ACME screws and trapezoidal screws. This makes for a smoother operation while lowering friction and backlash. Moreover, the new technology has the advantage of faster production speed and lower prices.
Besides differences in the definition of lead deviation and geometric tolerance, rolled and ground ballscrews can both eliminate axial play by preloading. Please contact us for related technical information.
Features
The production of the PMI rolled ballscrews has adopted a manufacturing process and equipment, unlike other manufacturers. Combining advanced skills and the Bad Düben digital electric screw thread rolling machine, we adhere to a strict quality control policy at every stage of production, from the selection of ballscrew material and rolled processing to induction hardening heat treatment and post-production. We are committed to providing clients with products of the best quality.
The combination of rolled ballscrews and ground nuts has replaced the traditional ACME screws and trapezoidal screws. This makes for a smoother operation while lowering friction and backlash. Moreover, the new technology has the advantage of faster production speed and lower prices.
Besides differences in the definition of lead deviation and geometric tolerance, rolled and ground ballscrews can both eliminate axial play by preloading. Please contact us for related technical information.
Features
The Ball Spline groove profile is a designed Gothic arch. By applied preload, the backlash in the rotational direction is eliminated therefore having higher positioning accuracy.
Spline nut and the support bearing is integration structure. The Spline nut is designed and lightweight. Therefore, a highly accurate and compact design is achieved.
The ball's recirculation in the ball holder prevents balls from falling from the spline nut while assembling.
The support bearing of the Ball Screw is designed with a contact angle of 45°. Thus it has higher axial rigidity, while Ball Spline has a contact angle of 45°; thus, it has the average force of axial and radial direction.
As the Ball Screw is adapting end cap recirculation structure, thus can be smooth motion with lower noise.
SCARA robot / Assembly robot / Automatic loader / and Machining center's, ATC equipment. Linear Guideway
The trains of balls are designed to a contact angle of 45° which enables them to bear an equal load in radial, reverse radial and lateral directions. Therefore, it can be applied in any installation direction. Furthermore, the MSA series can achieve a well-balanced preload for increasing rigidity in four directions while keeping a low frictional resistance. This is especially suited to high precision and high rigidity required motion.
The patent design of the lubrication route makes the lubricant evenly distribute in each circulation loop. Therefore, optimum lubrication can be achieved in any installation direction, and this promotes the performance in running accuracy, service life, and reliability.
Characteristics
The trains of balls are designed to a contact angle of 45° which enables it to bear an equal load in radial, reversed radial and lateral directions. Therefore, it can be applied in any installation direction. Furthermore, MSB series can achieve a well balanced preload for increasing rigidity in four directions while keeping a low frictional resistance. This is especially suit to high precision and high rigidity required motion.
The patent design of lubrication route makes the lubricant evenly distribute in each circulation loop. Therefore, the optimum lubrication can be achieved in any installation direction, and this promotes the performance in running accuracy, service life, and reliability.
Characteristics
The trains of balls are designed to a contact angle of 45° which enables it to bear an equal load in radial, reversed radial and lateral directions. Therefore, it can be applied in any installation direction. Furthermore, MSB series can achieve a well balanced preload for increasing rigidity in four directions while keeping a low frictional resistance. This is especially suit to high precision and high rigidity required motion.
The patent design of lubrication route makes the lubricant evenly distribute in each circulation loop. Therefore, the optimum lubrication can be achieved in any installation direction, and this promotes the performance in running accuracy, service life, and reliability.
Characteristics
MSC st ows with Gothic-arch groove and designed to contact angle of 45° which enables it to bear an equal load in radial, reversed radial and lateral directions. Furthermore, ultra compact and low friction resistance design is suit to compact equipment. The lubrication route makes the lubricant evenly distribute in each circulation loop.
Therefore,the optimum lubrication can be achieved in any installation direction, and this promotes the performance in running accuracy, service life, and reliability.
Characteristics
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