SELECTION. Screw Conveyor Shaft Mount Speed Reducers. EASY SELECTION METHOD (for Electric Motors) G1--81

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1 EASY METHOD (for Electric Motors) When to Use Easy Selection The Easy Selection tables for Shaft Mount reducers are for electric motor selections up to 75 horsepower with output speeds up to 400 RPM, using AGMA recommended application class numbers. For extreme shock or high energy loads which must be absorbed, as when stalling; for power source other than an electric motor; or for extreme ambient temperatures, or oversized equipment, consult DODGE Application Engineering, (864) How to Select Step 1: Determine Class of Service See Table 1, page G1--15 to determine Load Classification for applications under normal conditions. Find the type application and duty cycle that most closely matches your specific application. Class I Steady load not exceeding Motor rating and light shock loads during 10 hours a day. Moderate shock loads are allowable if operation is intermittent. For Class I applications, the maximum value of starting and momentary peak loads should not exceed 2 x Motor rating. If it exceeds this amount it should be divided by 2 and the result used in the selection table instead of the Motor rating. Class II Steady load not exceeding Motor rating for over 10 hours a day. Moderate shock loads are allowable during 10 hours a day. For Class II applications, the maximum value of starting and momentary peak loads should not exceed 2.8 x Motor rating. If it exceeds this amount it should be divided by 2.8 and the result used in the selection table instead of the Motor rating. Class III Moderate shock loads for over 10 hours a day. Heavy shock loads are allowable during 10 hours a day. For Class III applications, the maximum value of starting and momentary peak loads should not exceed 4 x Motor rating. If it exceeds this amount it should be divided by 4 and the result used in the selection table instead of the Motor rating. Step 2: Determine Reducer Size See the Easy Selection Tables, pages G1--84 thru G From Selection Table I, II or III read the reducer size for the application horsepower and output speed. Note: For applications where fan cooling is unacceptable use the Easy Selection tables with an increased Class number. Where more than one reducer selection is listed, the most economical ratio is generally listed first. See page G for maximum input and output speeds, overhung load ratings and WR 2 ratings. Step 3: Check Dimensions See Selection/Dimensions sections, pages G1--90 thru G for reducer dimensions, weights and part numbers. See Engineering/Technical section, page G and G for reducer mounting positions. Step 4: Select Screw Conveyor Drive Shaft and Adapter to fit screw diameter See Selection/Dimensions section, pages G1--90 thru G for compatability of screw diameter, drive shaft diameter and adapter. ENGINEERING/TECHNICAL PAGES G G G1--81

2 Step 5: Select a Belt Drive Arrangement From the Sheave Ratio table, page G1--169, or the preselected 1750 RPM Motor V-drive tables, pages G thru G select the required sheave ratio for the belt drive. Select the belt drive so that the sheave mounted on the reducer shaft is not smaller than the minimum sheave diameter shown in Table 19, page G Note: Mount the sheave as close as possible to the reducer to minimize the effect of overhung load on the reducer. Step 6: Select Accessories See Modifications/Accessories section, pages G thru G1--126, for description, dimensions, weights, and part numbers for accessories available for the Screw Conveyor Drive reducer selected: Motor Mounts Belt Guards Cooling Fans Auxiliary Seal Kits Alternative drive shaft styles Filter Breathers Note: Screw Conveyor Drive reducers are shipped without oil. Screw Conveyor Drive reducers are suitable from stock for vertical or incline mounting, no modification required. EXAMPLE: Easy Selection Method SCXT Screw Conveyor Drive Reducers A RPM motor is used to drive a heavy duty screw conveyor that runs 10 hours per day in a local feed mill, conveying grain. User needs a replacement reducer drive for a CEMA standard screw conveyor with a 12 diameter screw and 2-7/16 diameter drive shaft. Conveyor speed is 72 RPM. Step 1: Determine Class of Service From Table 1, locate conveyors, general purpose; screw conveyor heavy duty, not uniformly loaded for 3 to 10 hours per day. This load is classified as a Class II application. Step 2: Determine Reducer Size From Table 10, Class II Selection, page G1--86, find the column for 5 and read down to 72 RPM. An SCXT225 reducer is the correct selection. Check maximum input and output speed, overhung load, and WR 2 requirements with reducer ratings on page G Step 3: Check Dimensions See Selection/Dimensions section, page 95, for reducer dimensions, weights, part numbers and other pertinent drive dimensions. See Engineering/Technical section, page G and G for information on mounting positions. Step 4: Select Screw Conveyor Drive Shaft and Adapter to fit screw diameter See Selection/Dimensions section, page 95. Here we verify that a 2-7/16 diameter drive shaft is compatible with 12 diameter screw. From this same page, select a C2B adapter with fits the 2-7/16 CEMA standard screw conveyor dirve shaft, as well as the 2 and 3 drive shafts. Step 5: Select a Belt Drive Arrangement From the Sheave Ratio table, page 158, or the Preselected 1750 RPM Motor V-Drive table for SCXT225 reducers, page G1--172, select a V-drive ratio for the conveyor speed of 72 RPM. With this information, select a belt drive that meets your customer s needs i.e. belt style preference, service factor requirements, Taper Lock or QD mounting, etc. Sheave diameter must not be less than minimum diameters shown in Table 19, page G Step 6: Select Accessories See Selection/Dimensions page 95 and Modifications/Accessories pages G thru G to pick out accessories for this application: M214 Motor Mount to mount motor to side of SCXT225 reducer. SCXT2D Expanded Metal Belt Guard to cover and protect the rotating belt drive. ENGINEERING/TECHNICAL PAGES G G G1--82

3 EASY GUIDE: SCXT SCREW CONVEYOR DRIVE REDUCERS This Is A Handy Reference Sheet For Quick Selection And Specification Of DODGE Screw Conveyor Drive Reducers. Use It To Identify Information Needed To Make An Accurate Selection With A Step-By-Step Selection Format For Choosing Reducer, Accessories And V-drive. Use This Page To Make Your Own Selections, Or Send This Form, With Application Data, To DODGE For Assistance. You May Make Copies For Future Use. Name Company Name Phone No. Fax No. Application Data: Type Of Driven Equipment Hours Of Service Per Day Class Of Service Type Of Load: Uniform Moderate Shock Motor Type: RPM Frame Size Shaft Size Screw Conveyor RPM Screw Diameter Drive Shaft Diameter And Type Adapter Type Unusual Ambient Temperature Other Pertinent Application Characteristics ( ie -- Dusty Environment, Reversing Duty, Start/Stop Cycles, Etc.) Reducer Drive Selection: Step 1 - Determine Class Of Service Step 2 - From Appropriate Service Class Table, Select Reducer Size And Ratio That Meets Application Hp And Driven Rpm Requirements: Step 3 - Select Drive Shaft With Diameter To Fit Screw Size Determine Type Of Drive Shaft Needed: Standard Stainless Steel 3-hole Standard 3-hole Stainless Short Series Step 4 - Select Adapter: C Standard AC Adjustable Packing Gland Step 5 - Select Accessories Required For Application: Motor Mount: Standard Long Belt Guard: Standard Long Cooling Fan Auxiliary Seal Kit Filter Breather Other V-belt Drive Specification: Service Factor V-belt Drive Ratio Needed Belt Center Distance Type Of Belt Desired Driver: Shaft Diameter Driven: Shaft Diameter Sheave Sheave Bushing Bushing Belts: Size Quantity ENGINEERING/TECHNICAL PAGES G G G1--83

4 EASY TABLE 9 CLASS I TABLE SCXT REDUCERS 4-70 SCXT125 SCXT115 1/ SCXT125 SCXT115 1/3 4-6 SCXT SCXT125 SCXT115 1/2 4-5 SCXT325A 6-10 SCXT SCXT125 SCXT115 3/4 4-5 SCXT425A 6-7 SCXT325A 8-15 SCXT SCXT125 SCXT SCXT525B 5-7 SCXT425A 8-12 SCXT325A SCXT /21/ SCXT125 SCXT115 L See page G for lubrication for 15 RPM and slower. 4-6 SCXT525B 7-10 SCXT425A SCXT325A SCXT225 SCXT SCXT125 SCXT SCXT SCXT525B SCXT425A SCXT325A SCXT225 SCXT SCXT125 SCXT SCXT SCXT SCXT525B SCXT425A SCXT415A SCXT325A SCXT315A SCXT225 SCXT SCXT215 SCXT SCXT109 SCXT SCXT115 SCXT SCXT109 SCXT SCXT105 SCXT109 SCXT SCXT SCXT SCXT SCXT525B SCXT425A SCXT415A SCXT325A SCXT315A 7-1/ SCXT315A SCXT325A SCXT215 SCXT SCXT215 SCXT SCXT205 SCXT209 SXT SCXT205 SCXT SCXT SCXT105 G1--84

5 EASY TABLE 9 CLASS I TABLE SCXT REDUCERS (CONT D) L 6--8 SCXT SCXT SCXT SCXT525B SCXT515B SCXT425A SCXT415A SCXT325A SCXT315A SCXT315A SCXT325A SCXT315A SCXT309A SCXT215 SCXT SCXT305A SCXT SCXT305A SCXT309A SCXT305A SCXT309A SCXT SCXT SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT425A SCXT415A SCXT415A SCXT425A SCXT415A SCXT409A SCXT309A+ SCXT315A SCXT405A SCXT315A SCXT309A SCXT405A SCXT309A SCXT305A SCXT309A SCXT305A SCXT SCXT725 SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT515B SCXT525B SCXT415A SCXT425A SCXT415A SCXT409A SCXT405A SCXT409A+ SCXT415A SCXT405A SCXT309A SCXT405A SCXT305A SCXT SCXT725 SCXT SCXT625 SCXT SCXT525B+ SCXT515B SCXT515B+ SCXT525B SCXT515B+ SCXT509B SCXT505A SCXT415A+ SCXT409A SCXT505A SCXT409A+ SCXT415A SCXT505A SCXT409A SCXT405A+ SCXT409A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT625 SCXT SCXT615 SCXT SCXT515B+ SCXT509B SCXT605 SCXT509B+ SCXT515B SCXT605 SCXT409A SCXT505A SCXT409A SCXT505A SCXT405A SCXT825 SCX SCXT725 SCXT SCXT625 SCXT SCXT615+ SCXT SCXT605 SCXT615+ SCXT SCXT605 SCXT515B+ SCXT509B SCXT605 SCXT509B SCXT SCXT505A SCXT825 SCXT SCXT725 SCXT SCXT715 SCXT SCXT615+ SCXT SCXT605+ SCXT SCXT605+ SCXT SCXT SCXT825 SCXT SCXT725+ SCXT SCXT715+ SCXT SCXT705 SCXT SCXT605+ SCXT SCXT SCXT825 SCXT SCXT SCXT715+ SCXT SCXT705 SCXT SCXT SCXT605+ L See page G for lubrication for 15 RPM and slower. + Fan cooling required see page G G1--85

6 EASY -- TABLE 10 CLASS II TABLE SCXT REDUCERS L 5-70 SCXT125 SCXT115 1/4 4-6 SCXT SCXT125 SCXT115 1/3 4-5 SCXT325A 6-9 SCXT SCXT125 SCXT115 1/2 4-5 SCXT425A 6-8 SCXT325A 9-16 SCXT SCXT125 SCXT115 3/4 5-7 SCXT425A 8-11 SCXT325A SCXT SCXT125 SCXT SCXT525B 7-11 SCXT425A SCXT325A SCXT225 SCXT /21/ SCXT125 SCXT115 L See page G for lubrication for 15 RPM and slower. 4-5 SCXT SCXT525B SCXT425A SCXT325A SCXT315A SCXT225 SCXT SCXT125 SCXT SCXT SCXT SCXT525B SCXT425A SCXT415A SCXT325A SCXT315A SCXT225 SCXT SCXT215 SCXT SCXT115 SCXT SCXT SCXT SCXT SCXT525B SCXT425A SCXT415A SCXT325A SCXT315A SCXT215 SCXT SCXT215 SCXT SCXT205 SCXT209 SCXT SCXT205 SCXT115 SCXT SCXT205 SCXT SCXT105 SCXT SCXT SCXT SCXT SCXT525B SCXT515B 7-1/ SCXT425A SCXT415A SCXT325A SCXT315A SCXT315A SCXT325A SCXT315A SCXT309A SCXT215 G1--86

7 EASY TABLE 10 CLASS II TABLE SCXT REDUCERS (CONT D) L SCXT305A SCXT209 SCXT / SCXT305A SCXT SCXT205 SCXT SCXT SCXT SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT425A SCXT415A SCXT415A SCXT425A SCXT315A SCXT309A SCXT305A SCXT315A SCXT309A SCXT305A SCXT309A SCXT305A SCXT SCXT SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT515B SCXT525B SCXT415A SCXT409A SCXT405A SCXT409A SCXT415A SCXT405A SCXT409A SCXT405A SCXT309A SCXT405A SCXT305A SCXT SCXT725 SCXT SCXT625 SCXT SCXT515B SCXT525B SCXT515B SCXT515B+ SCXT509B SCXT505A SCXT409A+ SCXT415A SCXT505A SCXT409A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT615 SCXT SCXT615 SCXT SCXT605 SCXT509B+ SCXT515B SCXT605 SCXT509B SCXT505A SCXT409A SCXT505A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT625 SCXT SCXT615 SCXT SCXT605 SCXT615+ SCXT SCXT605 SCXT509B SCXT SCXT505A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT SCXT615+ SCXT SCXT615+ SCXT SCXT605 SCXT SCXT SCXT505A SCXT825 SCXT SCXT815 SCXT SCXT SCXT705 SCXT709 SCXT SCXT705 SCXT709+ SCXT SCXT705 SCXT SCXT605 SCXT SCXT SCXT825 SCXT SCXT815 SCXT SCXT SCXT705 SCXT715+ SCXT SCXT705 SCXT SCXT SCXT SCXT815 SCXT SCXT SCXT SCXT705 SCXT SCXT705 L See page G for lubrication for 15 RPM and slower. + Fan cooling required see page G G1--87

8 EASY TABLE 11 CLASS III TABLE SCXT REDUCERS L 4-6 SCXT SCXT125 SCXT115 1/ SCXT115 SCXT SCXT115 SCXT SCXT SCXT125 SCXT115 1/3 4-5 SCXT425A 6-7 SCXT325A 8-15 SCXT SCXT125 SCXT115 1/2 4 SCXT525B 5-7 SCXT425A 8-12 SCXT325A SCXT225 3/ SCXT125 SCXT SCXT525B 7-10 SCXT425A SCXT325A SCXT SCXT125 SCXT /21/2 4-5 SCXT SCXT525B L See page G for lubrication for 15 RPM and slower SCXT425A SCXT325A SCXT225 SCXT SCXT125 SCXT /2 1/2 5-7 SCXT SCXT525B SCXT425A SCXT325A SCXT315A SCXT225 SCXT SCXT115 SCXT SCXT SCXT SCXT SCXT525B SCXT425A SCXT415A SCXT325A SCXT315A SCXT225 SCXT SCXT215 SCXT SCXT215 SCXT SCXT205 SCXT215 SCXT SCXT205 SCXT109 SCXT SCXT205 SCXT SCXT105 SCXT SCXT SCXT SCXT SCXT525B SCXT515B SCXT425A SCXT415A SCXT325A SCXT315A SCXT315A SCXT325A SCXT315A SCXT309A SCXT305A SCXT215 SCXT309A SCXT305A SCXT209 SCXT SCXT305A SCXT SCXT205 SCXT SCXT205 G1--88

9 EASY TABLE 11 CLASS III TABLE SCXT REDUCERS (CONT D) L SCXT SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT425A SCXT415A 7-1/ SCXT415A SCXT425A SCXT415A SCXT409A SCXT405A SCXT309A SCXT315A SCXT405A SCXT309A SCXT305A SCXT309A SCXT305A SCXT SCXT725 SCXT SCXT625 SCXT SCXT525B SCXT515B SCXT515B SCXT525B SCXT415A SCXT415A SCXT409A SCXT405A SCXT409A SCXT415A SCXT405A SCXT309A SCXT405A SCXT305A SCXT825 SCXT SCXT725 SCXT SCXT625 SCXT SCXT615 SCXT SCXT515B SCXT515B SCXT509B SCXT605 SCXT509B SCXT515B SCXT605 SCXT509B SCXT505A SCXT409A SCXT505A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT625 SCXT SCXT615 SCXT SCXT605 SCXT509B+ SCXT515B SCXT605 SCXT509B SCXT SCXT505A SCXT405A SCXT825 SCXT SCXT725 SCXT SCXT715 SCXT SCXT615 SCXT SCXT615+ SCXT SCXT605 SCXT615+ SCXT SCXT605 SCXT SCXT SCXT505A SCXT825 SCXT SCXT725 SCXT SCXT SCXT615 SCXT SCXT705 SCXT SCXT605 SCXT SCXT SCXT505A SCXT825 SCXT SCXT SCXT715 SCXT SCXT705 SCXT715+ SCXT SCXT705 SCXT SCXT SCXT SCXT815 SCXT SCXT SCXT715+ SCXT SCXT SCXT705 SCXT SCXT SCXT SCXT SCXT705 SCXT SCXT705 L See page G for lubrication for 15 RPM and slower. + Fan cooling required see page G G1--89