Quick Selections. How to Use Service Factor. Worm Gear Reducers. Single Reduction

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Kelley Baker
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1 Quick Selections How to Use Based on required output RPM and input motor horsepower, read across chart for the appropriate reducer size. As a rule of thumb, use 1.00 service factor chart for applications having uniform loads with up to 10 hours service duration per day. Use 1.25 service factor chart for longer service or shock loading. These charts are to be considered as guides only. Typically reducers are selected based on application torque, not necessarily HP. Refer to page 644 or contact Factory with specific application information. Reducer size corresponds to center distances of secondary stage reducer, as shown in the chart below Service Factor Nominal Output Input 10 RPM Ratio RPM 1/8 1/6 1/4 1/3 1/2 3/ / / ** * * 832** * 832** * * * * * * 832** Nominal Output Input 10 RPM Ratio RPM 1/8 1/6 1/4 1/3 1/2 3/ / / ** ** ** * * * 832** * * ** Note: This chart is meant as a guide for reducer selections at specific motor horsepowers. Actual service factor may be greater than indicated. For actual service factors and maximum worm reducer ratings, refer to pages Actual ratio combinations supplied by Factory may vary from above depending on application and manufacturing requirements. Refer to page 141 for exact ratio of worm-worm gear reducers. * Size 832 must be used for NH Series for this selection. ** Size 842 must be used for NH Series for this selection. indicates a selection where a smaller reducer (1 case size) can be used with redesigned product due to rating increase. indicates a selection where a smaller reducer (2 case sizes) can be used with redesigned product due to rating increase. 130

2 1.50 Service Factor Quick Selections Nominal Output Input 10 RPM Ratio RPM 1/8 1/6 1/4 1/3 1/2 3/ / / * ** 832** ** * * * 832** ** ** ** * 832** Single Reduction 1. Service Factor Nominal Output Input 10 RPM Ratio RPM 1/8 1/6 1/4 1/3 1/2 3/ / / * ** * 832** * 832** ** * 832** * Service Factor Nominal Output Input 10 RPM Ratio RPM 1/8 1/6 1/4 1/3 1/2 3/ / / ** * * 832** * 832** * 832** ** * * 832** Note: This chart is meant as a guide for reducer selections at specific motor horsepowers. Actual service factor may be greater than indicated. For actual service factors and maximum worm reducer ratings, refer to pages Actual ratio combinations supplied by Factory may vary from above depending on application and manufacturing requirements. Refer to page 141 for exact ratio of worm-worm gear reducers. * Size 832 must be used for NH Series for this selection. ** Size 842 must be used for NH Series for this selection. indicates a selection where a smaller reducer (1 case size) can be used with redesigned product due to rating increase. indicates a selection where a smaller reducer (2 case sizes) can be used with redesigned product due to rating increase. 131

Maximum Rating Tables 132 SIZE 813, 815, 818 1.0 S.F. SIZE 813 SIZE 815** SIZE 818 10 23.30 0.215 0.141 381 0.391 0.242 654 0.415 0.287 776 1170 15.60 0.154 0.097 390 0.286 0.168 678 0.295 0.

3 Maximum Rating Tables 132 SIZE 813, 815, S.F. SIZE 813 SIZE 815** SIZE At speeds above 10 input RPM, gear reducers may become thermally limited. For continuous operation, limit input HP to 10 RPM input ratings shown. Contact Factory with application requirements if higher speeds are required. ** Size 815 is not available in Electra aluminum EL Series.

4 Maximum Rating Tables Single Reduction SIZES 821, 824, S.F. SIZE 821 SIZE 824 SIZE At speeds above 10 input RPM, gear reducers may become thermally limited. For continuous operation, limit input HP to 10 RPM input ratings shown. Contact Factory with application requirements if higher speeds are required. 133

5 Maximum Rating Tables SIZES 830, S.F. SIZE GR830 & EL830 SIZE NH830 SIZE GR832 & EL832 SIZE NH832 Input Output Output HP HP TQ (lb-in) At speeds above 10 input RPM, gear reducers may become thermally limited. For continuous operation, limit input HP to 10 RPM input ratings shown. Contact Factory with application requirements if higher speeds are required. 134

6 Maximum Rating Tables Single Reduction SIZES 842, 852, S.F. SIZE 842 SIZE 852 SIZE 860** At speeds above 10 input RPM, gear reducers may become thermally limited. For continuous operation, limit input HP to 10 RPM input ratings shown. Contact Factory with application requirements if higher speeds are required. ** Size 860 is only available in GR & EL Series. 135

Maximum Rating Tables GR Series All Stock Styles SIZES 870, 880, 8 1.0 S.F. SIZE GR870 SIZE GR880 SIZE GR8 0 10 23.30 9.13 7.55 20601 15.50 13.00 35507 26.50 22.50 61010 1170 15.60 7.69 6.16 25161 12.

7 Maximum Rating Tables GR Series All Stock Styles SIZES 870, 880, S.F. SIZE GR870 SIZE GR880 SIZE GR At speeds above 10 input RPM, gear reducers may become thermally limited. For continuous operation, limit input HP to 10 RPM input ratings shown. Contact Factory with application requirements if higher speeds are required. 136

Model Number System Double Reduction Helical-Worm

Model Number System Double Reduction Helical-Worm Worm - Helical - Model Number System Helical-Worm 800 Series Gear Reducer Model Number Nomenclature All new stock and custom 800 Series Grove Gear and Electra-Gear worm reducers are identified by a model