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General Data & Technical Data Specification:
General data
Technical data specifications 

 

G E N E R A L   D A T A    Back to top
 

Reference standardISO3408/DIN 69051

 

Ball screw types: Precision type, Transport type

 

Applications field:

 

Reactor technology

- refueling machines 
- control rod drive mechanism

 

Aircraft industry
- aircraft landing flaps
- airport equipment

 

Machine tool engineering
- milling&boring machines
- machining center 
- jig borer
- laser cutting machines
- grinding machines
- drilling machines

 

Medical technology
- X-ray apparatus
- radiotherapy devices
- hospital beds

 

General mechanical engineering
- paper-processing machines
- packaging machines 
- plastics processing machines
- wood working machines
- industrial robots 

 

Automotive industry
- linear actuators
- devices and fixtures

 

Steel industry
- smelting plants
- slab lifting plants

 

Miscellaneous
- lifting units (e.g. car lifts)
- valve actuators

 

 

T E C H N I C A L   D A T A   S P E C I F I C A T I O N S  Back to top
 

Thread profile:

 

Ogival (gothic) profile- standard

or

Circular (round) profile-at request

Materials:

WPC ball screw are made of high quality steel to ensure best performance and reliability. The steel used is equivalent to the international standards as shown in the table:

Item Romania USA Germany Japan France Italy
STAS/SR AISI DIN  JIS NF UNI
Screw OCL55X 1050 CK55 (1.1203) S55C XC5 C50
Nuts RUL2 52100 (1.13520) SUJ3 100C6 ~100Cr6
Balls RUL2 52100 SEW 100CrMo6 SUJ3 100C6 ~100Cr6
 

Hardness:

Ball race zone of screw profile HRC 60+2 (induction hardening)
Nut body HCR 60-61
 

Balls Standard

STAS/SR ISO HCR 60-65
5904 3290
 

Manufacture types:

WPC producing only Ground Precision Ball Screws

WPC producing only Ground Precision Ball Screws. The table below shows the standard combinations between the nominal diameter (d0), the nominal lead (Ph) and maximum no. of circuits/turns (t) using internal return part model. All values are in metric system and applied for right hand or left hand thread direction. the values in inch are also available at request.

Standard range (dn x Ph x t)
d0 2 4 5
(6)
10
(8)
12 16 20 24 32 40 50 64
Ph
12 3 3
16 3 3 4
20 3 4
25 4 3 3 2
32 3 6 6 4 4 2
40 6 6 4 2 2
50 6 6 4 3 3 2
63 6 7 6 3 3 2
80 6 8 6 6 4 3
100 4 6 6 7 6 6 4 3
125 6 6 6 6 6 4 3 2
160 6 6 6 6 6 6 3
180 4 6 6 6 6 3
 

Note: -The (t) blue values belong to special orders.

          -The (t) bold values belong to standard range.

 

WPC is able to manufacture threaded lengths as is shown in the table:

WPC manufacturing capability

d0
(mm)

Maximum Thread Length (Lthr) (mm)

ISO 1

ISO 3

ISO 5

ISO 7

(ISO 10)

12 240 320 - - -
16 320 480 640 800 -
20 400 640 800 1250 2000
25 500 750 1000 2500 3200
32 640 960 1250 3200 4000
40 800 1250 1500 4000 5000
50 1000 1500 2500 5000 7000
63 1250 1890 3000 7000 9000
80 - 2400 4000 9000 10000
100 - 3200 5000 10000 -
125 - - 5000 12000 -
160 - - - 12000 -
 

Note: 

- The extra values for nominal lead are available at request e.g.: 3, 6, 8, 12, 24
... a.s.o.

- The extra values for nominal diameter are available at request e.g.: 15, 18, 24  
... a.s.o.

- The maximum length is t be understood as value that the accuracy is possible to be performed.

 

Note: - The Offset Preload is well known as "opposite row contact";

          - The Oversize ball preload is well known as "four points contact";

          - The method "zero backlash" and "axial play" is also available at request.

 

The WPC standard ball's re-circulation system used in normal applications is the deflector part type. We can also supply at request and other systems as the the table below shows:
Re-circulating systems:
Re-circulating part Balls re-circulation system Application
Deflector Internal Standard
Return Tube Internal At request
External
End Cape Internal
 

Preload system:

Preload systems for  WPC ball screws
Assembly Preload types Preload Symbol Description
Single nut Offset preload (OP) One long nut with opposite identical ball circuits
Oversize ball preload (SP) Ball with diameter over the regular size
Adjustable preload (AP) A splitted nuts is used by clearance adjusting
Axial play (NP) Without preload, free axial play
Double nut Double nut preload (PD) Two nuts with spacer inserted
Two nuts with spring inserted
 

Note:  - The Offset Preload is well known as "opposite row contact"

           - The Oversize Ball Preload is well known as "four points contact"

           - The method "zero backlash" and "axial play" are also available at request

 

Seals:

The WPC ball nuts are equipped with PTFE (Teflon) wipers, which provide high resistance and protection against contamination. For other application (as repair) felt wipers are also available at request only.
Wiper located on nut sides
Wiper located on housing
* Before selecting the wipers type please use the below recommendations.
Type of wiper Application Lubrication Friction Design
Teflon (PTFE) Normal operation, very few possible contamination  Oil or grease Medium Are to be selected from catalogue
Felt wiper Service Grease Very high Only at request
 

Note: - A perfect sealing is difficult to be performed even using PTFE wipers.

          - The wipers are fixed with one, two or three hexagon socket head sharp
          screws.

          - Contamination protection to avoid premature wear is recommended. 

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