Products

PMI Ball Screw

The PMI ball screw series has a variety of nut installations to meet the needs of different equipment. It is developed according to screw size, industrial application, precision requirements and special industry fields. High precision, high rigidity and h
INQUIRY Buy At Alibaba
Description
PMI ball screw characteristics

High reliability
PMI has accumulated many years experience in production managing. It covers the whole production sequence, from receiving the order, designing, material preparation, machining, heat treating, grinding, assembling, inspection, packaging and delivery. The systemized managing ensures high reliability of PMI Ballscrews.

High accuracy
PMI Ballscrews are machined, ground, assembled and Q.C. inspected under the constant temperature control (20℃) to ensure high precision of Ballscrews. accuracy inspection certifi cate.
     
Long durability
PMI Ballscrews are made of German Alloy steels, which are well quenching and
tempering treated for good rigidity, along with suitable surface hardening to ensure long durability.
     
High working 
efficiency
Balls are rotating inside the Ballscrew nut to offer high working efficiency.
Comparing with the traditional ACME screws, which work by friction sliding between the nut and screw, the Ballscrews needs only 1/3 of driving torque.
It is easy to transmit linear motion into rotation motion.
     
No backlash and with high rigidity
The Gothic profile is applied by PMI Ballscrews. It offers best contact between
balls and the grooves. If suitable preload is exerted on Ballscrew hence to eliminate clearance between the ball nut and screw and to reduce elastic deformation, the ballscrew shall get much better rigidity and accuracy.
PMI's precision ground Ballscrews are controlled in accordance with JIS B 1192.
The permissible values and each part of defi nitions are shown below.

Terms
T+E  Cumulative representative lead.
 A straight line representing the tendency of the cumulative actual lead.
 This is obtained by least square method and measured by laser system.
P  Permissible value.
a  Actual value.
T  Specifi ed travel.
 This value is determined by customer and maker as it depends on different application
 requirements.
E  Accumulated reference lead deviation.
 This is allowable deviation of specifi ed travel. It is decided by both of the accuracy grade and
 effective thread length.
e  Total relative lead variation
 Maximum width of variation over the travel length.
e300  Lead deviation in random 300 mm.
e2π  Lead deviation in random 1 revolution 2π rad.

Accumulated reference lead deviation (±E) and total relative variation (e)
                                                                                                                                                                     Unit:μm
ffective thread length (mm) GRADE Co C1 C2 C3 C4 C5
OVER UP TO E e E e E e E e E e E e
  315 4 3.5 6 5 8 7 12 8 12 12 23 18
315 400 5 3.5 7 5 9 7 13 10 14 12 25 20
400 500 6 4 8 5 10 7 15 10 16 12 27 20
500 630 6 4 9 6 11 8 16 12 18 14 30 23
630 800 7 5 10 7 13 9 18 13 20 14 35 25
800 1000 8 6 11 8 15 10 21 15 22 16 40 27
1000 1250 9 6 13 9 18 11 24 16 25 18 46 30
1250 1600 11 7 15 10 21 13 29 18 29 20 54 35
1600 2000     18 11 25 15 35 21 35 22 65 40
2000 2500     22 13 30 18 41 24 41 25 77 46
2500 3150     26 15 36 21 50 29 50 29 93 54
3150 4000     32 18 44 25 60 35 62 35 115 65
4000 5000         52 30 72 41 76 41 140 77
5000 6300         65 36 90 50 95 50 170 93
6300 8000             110 62 120 62 210 115
8000 10000                 157 75 260 140
QQ
Linda liu 15920481101