Page 10 of catalogue Ground ball screws of SKF Linearsysteme GmbH

3 Technical data

Technical data
Lead precision according to ISO
Lead precision is measured at 20 °C on the useful stroke lu , which is the threaded length decreased, at each end, by the length le equal to the screw shaft diameter see (➔ table 1) and (➔ fig. 1).

Table 1 G1 V300p, μm lu mm 0 - 315 (315) - 400 (400) - 500 (500) - 630 (630) - 800 (800) - 1000 (1000) - 1250 (1250) - 1600 (1600) - 2000 (2000) - 2500 (2500) - 3150 (3150) - 4000 ep μm 6 7 8 9 10 11 13 15 6 6 7 7 8 9 10 11 6 vup ep μm 12 13 15 16 18 21 24 29 35 41 12 12 13 14 16 17 19 22 25 29 G3 12 vup ep μm 23 25 27 32 36 40 47 55 65 78 96 115 23 25 26 29 31 34 39 44 51 59 69 82 G5 23 vup

Fig. 1

lu = le = lo = ls = c=

useful travel excess travel (no lead precision required) nominal travel specified travel travel compensation (difference between ls and lo to be defined by the customer, for instance to compensate an expansion)

ep V V300p Vup V300a Vua

= tolerance over the specified travel = travel variation (or permissible band width) = maximum permitted travel variation over 300 mm = maximum permitted travel variation over the useful travel lu = measured travel variation over 300 mm = measured travel variation over the useful travel

Case with value of c specified by the customer
Fig. 2

Case with c = 0 = standard version in case of no value given by the customer
Fig. 3

μm +
Threaded lengt h le lu le mm c v up ep ep lm ls l0 le Threaded lengt h lu

μm
+

le ep v up mm ep

l0

-

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