|
Thread profile: |
 |
|
Ogival (gothic) profile- standard
or
Circular (round) profile-at request |
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|
Materials:
WPC ball screws 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 |
HRC
60-61 |
|
Balls Standard
|
STAS/SR |
ISO |
HRC
60-65 |
| 5904 |
3290 |
|
|
Manufacture types: |
| WPC is
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 to 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
other systems as 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 nut 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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