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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Manual | | | | | | www.velmex.com | | | | | | | | | | | | | | A Few Words About Lead Screws The lead screws In our UniSlide Assemblies are formed by rolling through precision dies, rather than cut on a screw machine. This results in higher quality and accuracy. Our lead screws are 303 stainless steel except W2, W4 and P5 lead screws which are electroless nickel plated cold rolled steel. Nonmagnetic brass lead screws are avail-able-please refer to the Engineering Data on page 1.36. Lead Screw Diameters | | Accuracy The accuracy of standard lead screws is 0.007"/10" or better. The accuracy of Graduated Knob Model screws is 0.0015710" or 0.033 mm/20 cm or better, and is checked to not exceed this value. Thrust Bearings Design A15 and A25 lead screws use pre-loaded Delrin®thrust bearings except A25 W1, and P10, which have pre-loaded ball bearings. A40, A60 and B90 lead screws have pre-loaded ball bearings. | | Backdriving Because of the steep helix angle of the threads in W2, W4 and P5 lead screws, they may backdrive (coast back down) when supporting a vertical load or, if horizontal and a linear thrust load is applied, the slider will move away until the thrust has been equalized. If you want the industrial slide to stay where you put it, be aware of this characteristic and design accordingly. | | | | | | | | | | Keyword: lead | | | | | | | | | | | | | | | | | | | | | | | | | | Series | Type Code | Diameter | | | | A15&A25 | C, B, P40, P20 | 1/4" | | | | A15&A25 | K1, K2,Q1,Q2 | 7 mm | | | | A25 | W1, P10, W2, W4, P5 | 3/8" | | | | A40 | C, B, W1, W2,W4, P40, P20, P10, P5 | 3/8" | | | | A40 | K1, K2, Q1.Q2 | 10 mm | | | | A60 & B90 | C, B, W1, W2,W4, P40, P20, P10, P5 | 1/2" | | | | A60 & B90 | K1, K2, Q1.Q2 | 14 mm | | | | | | | | | | | | | | See Input Your Specifications on web site for UniSlide model number selection. | | | | | | | | | | | | | | Lead Screw Code Letters for Series Numbers Use these code letters when constructing model numbers. Lead screw code letter(s) follow base length value. | | | | | | | | | | | | | | | | | | | | | | Series English Thread | Turns per Inch English Tread | Advance per Revolution | Screw Motion Type Code Letter for Standard Accuracy | Scale and Vernier Type Code Letter | Graduated Knob Code Letter for Precision Accuracy | Divisions on Graduated Knob | | | | A15, A25, A40, A60, B90 | 40 | 0.025" | C | CE* | P40 | 25 | | | | A15, A25, A40, A60, B90 | 20 | 0.050" | B | BE* | P20 | 50 | | | | A25, A40, A60, B90 | 10 | 0.100" | W1 | W1E* | P10 | 100 | | | | A25, A40, A60, B90 | 5 | 0.200" | W2 | W2E* | P5 | 200 | | | | A25, A40, A60, B90 | 2.5 | 0.400" | W4 | — | — | — | | | | Series Metric Thread | Turns per cm Metric Thread | | | | | | | | | A15, A25, A40, A60, B90 | 10 | 1 mm | K1 | K1M* | Q1 | 100 | | | | A15, A25, A40, A60, B90 | 5 | 2 mm | K2 | K2M* | Q2 | 200 | | | | | | | | | | | | | | | | | | | | | | * Not available in B90. Delrin® is a trademark of E I. duPont Co. 1.38 Manual UniSlide Lead Screws | | | | | | 1-800-642-6446 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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