322 TECHNICAL INFORMATION "YJBM $MFBSBODFT PG #BMM 4DSFXT Axial clearance does not affect positioning accuracy if the feed is unidirectional, but will generate backlash and negatively affect on positioning accuracy if the direction or the axial load is reversed. Select the axial clearance in such a way that the current requirement for positioning accuracy are met. 5ZQFT 1SPE &YBNQMF 4DSFX 4IBGU %JB -FBE "YJBM $MFBSBODF NN 4DSFX 4IBGU -FOHUI NN .*/ ."9 Existing Products Standard Nut Accuracy Grade C5 #44 8 2 0.005 or less 100 210 10 2 100 315 4 150 380 10 150 450 12 2 150 445 4 150 400 5 150 450 10 200 600 15 5 150 1095 10 200 1095 20 230 1095 20 5 200 1000 10 250 1500 20 250 1500 25 5 300 995 10 300 1500 20 300 1500 C−Value Standard Nut Accuracy Grade C5 $ #44 8 2 0.008 or less 100 210 10 2 100 315 4 150 380 12 2 150 445 5 150 450 10 200 600 15 5 0.015 or less 150 1095 10 200 1095 20 230 1095 20 5 200 1000 10 250 1500 20 250 1500 25 5 300 995 10 300 1500 25 300 1500 Existing Products Standard Nut Accuracy Grade C3 #49 6 1 0 (Preloaded) 80 205 8 1 80 255 2 100 240 10 2 100 310 12 2 150 390 5 150 440 15 5 150 590 Existing Products Standard Nut Accuracy Grade C7 #44& 8 2 0.030 or less 100 210 10 2 100 315 4 150 380 12 2 150 445 5 150 450 10 200 600 15 5 150 1095 10 200 1095 20 230 1095 20 5 200 1000 10 250 1500 20 250 1500 25 10 300 1500 20 300 1500 5ZQFT 1SPE &YBNQMF 4DSFX 4IBGU %JB -FBE "YJBM $MFBSBODF NN 4DSFX 4IBGU -FOHUI NN .*/ ."9 Existing Products Compact Nut Accuracy Grade C10 #44$ 8 2 0.05 or less 100 400 10 4 150 600 12 4 150 800 15 5 0.10 or less 150 1200 10 200 1200 20 5 200 2000 10 0.15 or less 250 2000 25 5 0.10 or less 200 2000 Existing Products Standard Nut Accuracy Grade C10 #44; #443 8 2 0.05 or less 100 400 4 100 380 10 2 150 585 4 150 600 10 150 585 12 4 150 800 10 0.10 or less 150 800 14 5 150 800 15 5 150 1200 10 200 1200 20 200 1200 20 5 200 2000 10 0.15 or less 250 2000 20 0.10 or less 250 2000 25 5 200 2000 10 0.20 or less 300 2000 25 0.12 or less 300 2000 28 6 0.10 or less 250 2000 32 10 0.20 or less 300 2000 32 0.15 or less 300 2000 C-VALUE Products Standard Nut Accuracy Grade C10 $ #44$ 8 2 0.05 or less 100 400 10 2 150 585 4 150 600 12 5 150 800 10 0.10 or less 150 800 15 5 150 1200 10 200 1200 20 200 1200 20 5 200 2000 10 0.15 or less 250 2000 20 0.10 or less 250 2000 25 5 200 2000 10 0.20 or less 300 2000 25 0.12 or less 300 2000 Existing Products Block Nut Accuracy Grade C10 #4#3 15 5 0.10 or less 150 1200 20 200 1200 25 200 1500 15 10 150 1200 20 0.15 or less 200 1200 25 0.20 or less 200 1500 Existing Products Standard Nut Accuracy Grade C7 #445 8 2 0.03 or less 100 380 10 4 150 585 12 4 150 795 15 5 150 1200 10 200 1200 20 200 1200 20 5 200 1200 10 0.05 or less 250 2000 20 0.03 or less 250 2000 25 5 200 2000 10 0.07 or less 300 2000 4FMFDUJPO &YBNQMF PG -FBE "DDVSBDZ 4FMFDUJPO &YBNQMF PG "YJBM $MFBSBODF <Requirements> · Ball screw diameter Ø15, lead 20. · Stroke 720mm · Positioning accuracy ±0.05mm/720mm <Requirements> · Ball screw diameter Ø15, lead 5. · Allowable backlash ±0.01mm <Selection Details> Select an appropriate lead accuracy grade based on the application requirements. <Selection Details> From Table 5., it can be determined that C5 grade with 0.005mm or less axial clearance satisfies the allowable backlash amount of 0.01mm for the Ø15 group. (1) Evaluating the screw thread length Stroke+Nut Length+Margin=720+62+60=842 *The Margin shown above is an overrun buffer, and normally determined as 1.5~2 times the screw lead. Lead 20x1.5x2 (both ends)=60 (2) Evaluating the lead accuracy Verify the actual mean travel error ±ep for 842mm ball screw thread by referencing the Table 1. on P.321. C3 · · · ±0.021mm/800~1000mm C5 · · · ±0.040mm/800~1000mm (3) Determining the lead accuracy It can be determined that a C5 grade (±0.040/800~1000mm) ball screw can satisfy the required positioning accuracy of ±0.05/720mm. Q5BCMF "YJBM $MFBSBODFT PG 3PMMFE #BMM 4DSFXT Q5BCMF "YJBM $MFBSBODFT PG 1SFDJTJPO #BMM 4DSFXT
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