Manual / Guide · 1963
GSP 230-005-702 Strowger Two-Motion Switches, Wiper Adjustment
Wiper adjustment procedure for AE Strowger two-motion switches (file name follows TCI's number; document header reads 230-005-702).
Manual / Guide · 1963
Wiper adjustment procedure for AE Strowger two-motion switches (file name follows TCI's number; document header reads 230-005-702).
SECTION 230-005-702 ISSUE 1, MARCH, 1963 GT&ESTANDARD GENERAL SYSTEM PRACTICES ENGINEERING-PLANT SERIES STROWGER TWO MOTION SWITCHES ADJUSTMENT, WIPERS D-46273-A Line Wiper D-46274-A Control Wiper Note: The D-46273-A wiper tip separation should be .009" to .015". The D-46274-A wiper hasno tip separation. Physical make-up of both is the same. 400 POINT BANK D-46271-A Vertical Wiper D-46270-A Line and Control Wiper with Wlper Cord Ring Figure 1. 600 POINT BANK Above are the Wiper Assemblies Referred to in this Practice and Examples Showing Where Each Type is Used. (The 400 Point Bank, Shown, Takes Two D-46273-A Line Wipers. The 300 Point Bank, Not Shown, Takes One D-46273-A Line Wiper and One D-46274-A Control Wiper.) @ GT&E SERVICE CORPORATION 1963 1 of 13 SECTlON 230-005-702 ISSUE 1 1. 1.03 Prior to adjustment, wipers should be cleaned and inspected for wear. All worn wipers should be replaced. See example of worn wiper tips (Fig. 2). GENERAL 1. 01 This practice presents a procedure for adjusting wiper spring assemblies on Strowger two-motion switches. 1.02 This practice is divided into two parts: Part A - Adjustment of Line and Control Bank Wipers Part B - Adjustment of Vertical Bank Wipers 1.04 Check that wiper tips are aligned (Fig. 3). If they are not properly aligned and adapters are not used.replace wiper assembly. If adapters are used, realign adapters. Do not replace complete assembly when adapters are used. If adapter is defective, replace adapter. A ---.-----------------------_._-----------------_.__... LINE WIPERS B CONTROL WIPERS Figure 2. Examples of Wiper Tips That Are in Various Stages of Wear. (Note That Line Wiper Tip Wear is Distributed Over a Wider Tip Area Than Control Wiper Tip Wear.) 2 of 13 SECTION 230-005-702 ISSUE 1 Solder Lug Wiper Spring AdaPter~ OfAdaPter~ LugL Sold.. of Wiper Wiper With Adapter Installeä. ~ Wiper Spring -. \ secured~ Adapter to Stub of Wiper By Tangs. Wiper Tip Alignment (Lengthwise) Properly Aligned Not Properly Aligned Wiper Tips Properly Aligned With No Twist. Wiper Tip Alignment (Sidewise) /, Lower Wiper Tip With Approximate 25 0 Twist to the Right. Wiper Tip Curvature Properly Aligned Figure, 3. Proper Curvatnre (Both Wiper Tips) Not Properly Aligned Right Side of Lower Wiper Tip Bent Out of Proper Curvature The Above Are Wiper Spring Assemblies, Wiper Spring Adapters, and Examples of Alignment. 3 of 13 SECTlON 230-005-702 ISSUE 1 1.05 Switches not equipped with wiper cord brackets should have wiper cords tied. Each tie is to be two complete turns of #12 Figure 4. cotton thread made about the wiper cords and seeured with a square knot sufficiently tight to prevent the tie from slipping. Example of a Switch that is Not Equipped With Wiper Cord Bracket,With the Wiper Cords Properly Tied. 1.06 Procedure for adjustment appears in the following order: Paragraph(s) Cleaning 3.04 Inspectlon 3.05 Angle of Wiper Spring Assembly to Shaft 3.06 Forming of Wipers 3.07 - 3.14 Wiper Tension (Follow) 3.15 - 3.17 Alignment of Wiper Spring Assembly to Bank Level at Rotary Normal 3.18 - 3.19 Wiper Bridging Adjacent Bank Contacts 3.27 Alignment of Wipers in the Eleventh Rotary Position 3.28 - 3.29 Wiper Tip Drag (Left Edge of Bank) 3.30 Bank Rod Collar Adjustment 3.31 - 3. 32 Vertical Wiper Alignment to Vertical Bank 3.35 - 3.37 Vertical Wiper Alignment to Vertical Bank Contacts 3.38 3.39 3.40 Alignment of Wiper Spring Assembly to Bank Contacts 3.20 - 3.23 Vertical Wiper Backstop and Wiper Spring Clearance Rotary Centering 3.24 - 3.26 Vertical Wiper Tension 4 of 13 SECTION 230-005-702 ISSUE 1 2. LIST OF TOOLS AND MATERIALS U necessary, open the release circuit for each switch at the V. O. N. • spring assembly. See Fig. 5. 2.01 See Table 1. TABLE 1 Part Description A H-16290-7 Klein Co., Adjusting Pliers or similar A #12 Cotton Thread A Dental Mirror A A.E. Co., 7063 Wrench A Small Paint Brush A Work Lamp A-B Screwdriver (4" x 3/16") A-B Wiper Spring Adjusters A-B Nut Driver (3/16") A-B A.E. Co., D-15455-A Busy Tool A-B Toothpicks B B 3. Vertical Off Normal Spring Assembly G.E. Co., GT-ll02 Tension Gauge (10 GMS. - 80 GMS.) or similar A.E. Figure 5. Co., H-7066 Spring Adjuster PROCEDURE 3.01 Complete the following steps: One Method for Opening the Release Circuit of a Strowger Two Motion Switch is by the Use of a Toothpick. 3.02 Place the work lamp to properly illuminate the switches to be worked on. 3.03 The number of switches made busy at one time should be governed by traffic conditions of the individual office. 11 Make busy the switches to be worked on. Where necessary, use the D-15455-A busy tool. 11 Remove the necessary switch covers. 3.04 If necessary, brush wipers with the paint brush. 5 of 13 SECTION 230-005-702 ISSUE 1 3.05 Inspect upper and lower wiper spring tips for wear (Fig. 6). UPPER WI PER TIP (Position Dental Mirror so that the Upper Wiper Tip may be I pected for Wear.) ________________________________________________ 1 LOWER WIPER TIP (Using a Toothpick, Position the Lower Wiper Tip so that it can be Inspected for Wear.) Figure 6. The Above Method is Used When Inspecting Upper and Lower Wiper Tips for Wear. 6 of 13 SECTJON 230-005-702 ISSUE 1 3.10 To change the angle of bend at D, place one adjuster between D and C (Fig.9a). Place another adjuster at J (Fig. 9a). Bend at Dasrequired. ~E~.!~_ol_~.!E~!:._S...P.-:2E~ ~~~~~~!7_!.~~E~.!!. 3.06 Check that the wipers are approximately at a 90 degree angle to the shaft (Fig. 7). If necessary, place adjuster at A or B and adjust up or down. 3.11 To change angle of bend at C (Fig. 9a) place one adjuster betweenD and C. Place the other adjuster at E. Bend at C as required. 3.12 Check space between wiper Ups at F (Fig.9a) and G (Fig.9b).Adjustbychanging angles at D and C (Fig. 9a). 3.13 Check clearance b~tween wiper springs and insulator at K (Fig. 9a), and H (Fig. 9b). Gauge by eye. Figure 7. Properly Formed Wiper Springs are Shown Above. !,~.!~!..n..$_~!-~ry_e2".-s_ 3.07 Check space between the wiper springs at L (Fig. 8). Spacing should be 1/8". If necessary, adjust by placing adjusters at K and M (near L) and bend each wiper at L as required. fI Double Bank Contact Wiper. -------------_.--_.._.•.Insulator Position Min. Clearance . 005 " Max. Clearance .015 " No Cleat§]I----------- Figure 8. h Properly Spaced Wiper Springs are Shown Above. 3.08 The wiper should be formed as shown in Fig. 8. Check that there is no bow between N and L. Adjust by working the H-16290-7 adjusting pliers along wiper, from L to N. 3.09 Check space between wiper springs at C (Fig. 9). Adjust by changing angle ofbend at D and C. 1 Single Bank Con tact Wiper. Figure 9. Wiper Tip and Insulator Clearance Requirements. 3.14 If one portion of wiper is adjusted, recheck all other adjustments. 7 of 13 SECTION 230-005-702. ISSUE 1 3.15 Checkwiper spring tension (follow). When checking, hold one wiper spring away from the other with a toothpick. See Fig. 10. If wiper spring follow does not nieet requirementa shown in Fig. 10, adjust wiper spring. Toothpick With tTpper Spring Tension Removed, Lower Spring Follows 1/8 tt ~ 1/32 tt. Figure 11. An Adjuster i8 being Used to Add Tension (Follow) to Line and Control Wiper Springs. Figure 10. A Toothpick can be used for Checking Wiper Spring Tension (Follow) andRequirements. (Procedure Shown is Reversed When Checking Upper Wiper Spring Tension.) 3.16 If wiper spring tension (follow) is to be added, place the adjuster on hub end of wiper spring as shown in Fig. 11. With a slight twisting motion (toward intended follow), work the adjuster to 0 forming a gradual bow. Remove as much of the bow as possible without destroying tensioning effect. Adjust both upper and lower wiper springs to insure equal wiper pressure on the bank contacts. 3.17 If wiper spring tension (follow) is to be removed, place the adjuster on hub end of wiper spring as shown in Fig. 12. With a slight twisting motion (opposite to wiper spring follow), work the adjuster to P to remove tensioning effect. Adjust both upper and lower wiper springs to insure equal wiper pres8ure on the bank contact. Figure 12. 8 of 13 Remove Tension (Follow) From Line and Control Wiper Spring by Working Adjuster to Point P. SECTION 230-005-702 ISSUE 1 Alignment of Wiper Spring Assembly-rölfa-nk-Level-ät ~~~~~l~~~§~l----------- 3.18 Check alignment of wiper spring assembly to the middle level of normally accessed bank levels with wiper spring assembly at rotary normal. 3.19 Step shaft vertically to position wiper in line with level to be checked. The horizontal center line of the wiper tip should coincide (:!:. .015 ") with the centerline of the bank level. To adjust, loosen the wiper locking screw and position wiper assembly as required. Retighten locking screw. 3.22 Check wiper tip angle on bank levels 1, 5, and 10, contact 1. Observe that the angle of the upper wiper to the bank contact is the same as the angle of the lower wiper tip to the bank contaet. See Fig. 13. To adjust, loosen the wiper locking screw with the nut-driver or serewdriver. Move wiper on shaft as required. Retighten loeking Serew. 3.23 Reeheek wiper tip adjustments if the following is observed: (1) If the wiper tip tension is applied to the wiper insulator when the wiper is resting on bank contaet. (2) If more than just the tip edge of the wiper is in contact with the bank contact. 3. 20 Check alignment to bank contact at levels 1, 5, and 10. To check, step shaft vertically to position wipers on desired bank level. 3.21 Check position ofwipersonbankcontacts 1 and 10. Observe that the wiper tips overlap the front edge of the bank contacts by ~t least 1/16" (Fig. 13). To adjust,loosenbank rod nuts (Fig. 17) with the H-7063 wrench. Move bank assembly toward or awayfrom the shaft as required. Retighten bank rod nuts. \WiPer Hub Wiper Tips Overlap Front \ /Edge of Bank Contact 1/16" ~l SeparatingInsulator Approximately Bank Contact Figure 13. Check that Wiper Tips Overlap Bank Contacts and that All Related Requirements are Met. 3.24 Check rotary eentering of wipers on bank eontacts 1, 5 and 10 ofbank levels 1 and 10 (Fig. 14). If difficulty is eneountered in eentering the wipers, adjust by repositioning either the wiper assembly or banks. 3.25 To reposition the wiper assembly, step shaft vertieally to bank level 5, and rotate to contaet 5. Loosen loeking screw with nut-driver or serewdriver. Center wiper tip on eontact 5. Retighten locking serew. 3.26 Recheck rotary centering on bank contaets 1, 5, and 10 of bank levels 1 and 10. The wipers should approximately center on all bank contacts. In some cases, the wipers will not approximately center on all contacts. In these cases, the distance the wipers are off-center on contact 1 should be the same as the distance the wipers are offcenter on contact 10. However, if the wipers rest to left of center on contact 1, they should rest to right of center on contact 10. Conversely, if the wipers rest to the right oi center on contact 1, they should rest to the left of center on contact 10. See Fig. 14. 9 of 13 SECTION 230-005-702 ISSUE 1 Figure 14. Rotary Centerirtg is Checked on Contacts 1, 5, and 10 and Adjusted on Contact 5. Figure 16. A Wiper Tip Ear beiog bent by an Adjuster . Wiper Bridging Adjacent Contacrs-------------- 3.27 Check wipers for bridging between adjacent contacts (Fig. 15). To check, step shaft vertically until the wiper is aligned with any one bank level. Rotate wipers across bank level. With the completion of each rotary step, observe that the wiper is not resting ein more than one bank contact. Should the wipers bridge, recheck rotary centering. Also check for bent wiper tip ears. To adjust wiper tip ears, place the adjuster as shown in Fig. 16 and bend as required. 3. 28 Check alignment of wipers to the eleventh rotary position on the bank level. Step wipers vertically to any bank level. Rotate wipers to eleventh rotary position. Return shaft until wiper tips nearly touch contact 10. The wiper tip horizontal center line should coincide to the horizontal center line of the bank level ~ . 015 " . If necessary, loosen locking screw of wiper assembly and move wiper up or down as required. 3.29 Alignment of wipers at the eleventh rotary step need not be checked if the following conditions exist: (1) If cam springs on the associated switch are adjusted to operate on rotary position 10. (2) If the associated bank has a bank contact insulator extending to the eleventh rotary position. Wiper Tip Drag (Left Edge üfBankl---------------- Figure 15. A Wiper Spring Assembly which is Bridging Between Bank Contacts 5 and 6, Level O. 3.30 To check for wiper tip drag along left edge of bank, move shaft vertically. No drag should be felt. If necessary, loosen locking screw on wiper assembly and adjust as r~ quired. Retighten locking Bcrew and recheck rotary centering of wiper. If difficulty is encountered in adjusting for drag, check for bent shaft or improper switch adjustment. 100f 13 SECTION230-005-702 ISSUE 1 Part B (Adjustment of Vertical ~~E~=~lE~!![---------------- 3. 31 Check that bank rod collar assemblies secure all banks in place. The upper bank should be in contact with at least one of the two bank rod locating shoulders (Fig. 17). Adjust by moving bank and collar as required. VerticalBank------------- 3.32 To change position of bank rod collar, loosenlocking screw (Fig. 17) with the screwdriver. Reposition bank and lock bank in bank collar slots. Tighten locking screw. 3.35 Check angle between vertical wiper and shaft (Fig. 18). If necessary, adjust by moving wiper assemblyas required. Replace wiper assembly if requirement cannot be met. Vertical Wiper Alignment to Bank Rod .--.....;:;B;.;;;an==k...:R.:.:od:.::..:N:.:.U::.;t:......._~ 3.36 Check that the vertical bank 1s parallel with the shaft (Fig. 18). To adjust loosen bank mounting screws with screwdriver and move as required. Bank Rod Shoulder Vertical Bank Assembly ~ .015 It --=:l- --Shaft 0-++-, 0 -r Bank Rod Collar and Locking Screws Figure 17. A 400 Point Bank with Arrows Indicating Bank Rods, Bank Rod Nuts, Bank Rod Shoulders, Bank Rod Collars and Locking Screws. Vertical Wiper 3.33 After adjustments are completed, remove toothpicks from off-normal spring assemblies and replace switch covers. 3. 34 Rem ave busies fram switches. Perform Figure 18. operating tests on each switch. Observe that switches function properly. 11 of 13 Vertical Bank Mounting SetScrews The Vertical Wiper Assembly and Vertical Bank is Shown With Related Requirements. SECT10N 230-005-702 ISSUE 1 3.37 Check that center line of vertical wiper is not more than .030" above nor .015" below center line of bank contact. Gauge by eye. Note that distance between vertical bank contacts is .015". See Fig. 18. Adjust wiper as required. (Fig. 20). Check all levels. To adjust, place the H-7066 spring adjuster as shown in Fig. 19. Bend as required. Vertical Wiper Backstop Vertical Bank Contact--~ Vertical Wiper Alignment to Vertfcä"fäaIik-confäcts----- 3.38 Check that the vertical wiper is aligned with the vertical bank contacts. To check, move wiper to first vertical step and rotate shaft until the vertical wiper back stop just lifts the wiper tip from the vertical bank contact. The end of the wiper spring should overlap bank contact by at least 1/16". This requirement should be met if the back edge of the wiper tip is approximately aligned with the front edge of the vertical bank contact. Check all levels. To adjust, place the H-7066 adjuster on the back-stop as shown in Fig. 19. Bend as required. o Vertical Spring Figure 20. I ~IP~r VerUcal Wiper ..J Tip Above is a Side View of the Vertical Wiper and Backstop Requirements. Y~.!.!!.~~~~2.P~.!_'!.~~!!.~t.!. 3.40 Check vertical wiper tension (30 gms. to 45 gms.). To check, move the shaft vertically to position the vertical wiper on any vertical bank contact. Place the GT-ll02 tension gauge as shown in Fig. 21. Pull gauge until tip just leaves bank contact. To adjust, place the H-7066 adjuster as shown in Fig. 22. Bend as required. Figure 19. Method for Adjusting Vertical Wiper Backstop is Shown in Circle. Vertical Wiper Backstop and ~J2~!=~€~[nJl~1~~~~E~~----3.39 Check vertical wiper backstop and wiper spring clearance at rotary normal. To check, move shaft to position the vertical wiper on contact 1 of the vertical bank. Check for a clearance of not more than .002" between the end of the backstop and wiper spring Figure 21. 12 of 13 Tension Gauge is Being Used for Checking Vertical W i per Spring Tension. SECTION 230-005-702 ISSUE 1 3.41 When adjustments are completed, remove toothpicks from off-normal spring assemblies and replace switch covers. """~;::I:g~-Adjuster 3.42 Remove busies from switches and perform operating tests on each switch. Observe that switches funetion properly. 4. Figure 22. Spring Adjuster is Being Used to Adjust Tension of Vertical Wiper Spring. REPORTS 4.01 Complete the required reports in aeeordanee with Ioeal praetiees. 13 of 13