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  1. Disassembling a Monroe LA-160 calculator, Workspace: stap 1, afbeelding 1 van 1
    • Prepare your workspace. Cover it with clean white paper or a white mat board. Light the area more than you think you'll need, and preferably from multiple directions.

    • Ready a cardboard box and lots of press-to-close bags to store the parts you pull off. Keep associated parts in their own bag, label each bag, and don't skimp on the number of bags!

    • Remove cats, small children, and capybaras from workspace. They like small parts, and you will be generating a lot of them.

  2. Disassembling a Monroe LA-160 calculator, Removing the carriage: stap 2, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator, Removing the carriage: stap 2, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator, Removing the carriage: stap 2, afbeelding 3 van 3
    • Let's first remove the carriage, which is the top part with all the number wheels on them.

    • Position the calculator so that its keyboard faces you. This orientation defines the left and right sides of the calculator.

    • Insert a 1/8" flathead screwdriver into each of the indicated two screwheads on the right and left sides of the carriage, simultaneously.

    • Unscrew the left side screw.

  3. Disassembling a Monroe LA-160 calculator: stap 3, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator: stap 3, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator: stap 3, afbeelding 3 van 3
    • Remove the left side screw.

    • Screw: 4-48 x 1/4", head 1/4" x 1/16"

    • Put it in a bag!

    • You should label each bag with the model number and serial number.

    • You can find the serial number by turning the calculator upside down and peering into the slot cut into the bottom, which gives you the model number and serial number.

    • Label the bag 1 so that you know where in the sequence this part was pulled off.

  4. Disassembling a Monroe LA-160 calculator: stap 4, afbeelding 1 van 1
    • Put the bag in a box labeled with the model and serial number.

    • Pat yourself on the back. You are now officially organized.

  5. Disassembling a Monroe LA-160 calculator: stap 5, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator: stap 5, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator: stap 5, afbeelding 3 van 3
    • Get something pointy, like a small screwdriver, and push it into the hole on the left side of the carriage that was revealed by the screw being removed.

    • This will push out the carriage shaft from the right side. Grab it and pull it out all the way.

    • Put the carriage shaft in your box of parts.

  6. Disassembling a Monroe LA-160 calculator: stap 6, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator: stap 6, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator: stap 6, afbeelding 3 van 3
    • Pull back on the two carriage latches.

    • With the other hand, lift the carriage up and away.

    • On the underside of the carriage is inscribed the serial number of the machine, in case you couldn't read it from the slot in the underside.

    • Mine is serial number 241824. Also, apparently Stapler Guy was really possessive of this calculator.

  7. Disassembling a Monroe LA-160 calculator, Carriage Parts (top): stap 7, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator, Carriage Parts (top): stap 7, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator, Carriage Parts (top): stap 7, afbeelding 3 van 3
    • Upper Dials. Consists of eight individual dials with black and red digits. Shows the multiplier in multiplication, and the result of division.

    • Lower Dials. Consists of sixteen individual dials, showing the result of addition and multiplication, the remainder in subtraction, and the dividend in division.

    • Dials Clear-out Crank. Rotate forwards one turn, stopping at bottom, to clear out upper dials. Backwards for lower dials.

  8. Disassembling a Monroe LA-160 calculator, Carriage Parts (bottom): stap 8, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator, Carriage Parts (bottom): stap 8, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator, Carriage Parts (bottom): stap 8, afbeelding 3 van 3
    • Clutch mechanism. Drives either the lower shaft or upper shaft, but not both.

    • Lower Dials shaft and wheels.

    • Upper Dials shaft and wheels.

    • Zeroing shaft.

    • Carriage lifting shaft, only active when zeroing the Lower Dials.

  9. Disassembling a Monroe LA-160 calculator: stap 9, afbeelding 1 van 1
    • Nelson White's U.S. patent "Zero-setting mechanism", filed in 1920, describes how this amazing thing works.

    • The clutch rotates one gear forwards when the crank is turned forwards, and it rotates another gear backwards when the crank is turned backwards.

    • One gear turns the upper shaft, the other gear turns the lower shaft. Little arms on the clutch lock the shafts into place when they are not turning.

    • On the left side of the carriage, cams on the upper and lower dials move a lever on the central zeroing shaft. Fingers on the zeroing shaft as a result move into place so that when the upper or lower shaft is rotated, the wheels stop when they display zero.

    • The zeroing mechanism rarely completely fails. It is useful to rotate the crank while observing all the different parts to gain an understanding of each part's function.

  10. Disassembling a Monroe LA-160 calculator, Removing the zeroing crank: stap 10, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator, Removing the zeroing crank: stap 10, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator, Removing the zeroing crank: stap 10, afbeelding 3 van 3
    • Turn the carriage to the right side.

    • Holding on to the crank, remove this screw.

    • Screw: 4-48 x 1/4", head 1/4" x 1/16"

    • Put the crank and screw in bag #1.

  11. Disassembling a Monroe LA-160 calculator, Removing the lower dials: stap 11, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator, Removing the lower dials: stap 11, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator, Removing the lower dials: stap 11, afbeelding 3 van 3
    • Remove this set screw.

    • Set screw: 5-44 x 1/8"

    • Put the set screw in bag #1.

  12. Disassembling a Monroe LA-160 calculator: stap 12, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 12, afbeelding 2 van 2
    • Turn the carriage to the left side.

    • Remove this set screw.

    • Set screw: 5-44 x 1/8"

    • Place the set screw in bag #1.

    • The set screws are used to align the shaft along its axis.

  13. Disassembling a Monroe LA-160 calculator: stap 13, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 13, afbeelding 2 van 2
    • This spring on the right side of the carriage needs to be removed.

    • Pull the arm on the right upwards to get better access to the spring.

  14. Disassembling a Monroe LA-160 calculator: stap 14, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 14, afbeelding 2 van 2
    • With the arm raised, use needlenose pliers to pull the spring off the arms.

    • Spring: Expansion, 0.31" compressed x 0.11", wire 0.014"

    • Place the spring in bag #1.

  15. Disassembling a Monroe LA-160 calculator: stap 15, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator: stap 15, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator: stap 15, afbeelding 3 van 3
    • Spread the arms out.

    • Use a 3/8" wrench to hold the nut, and unscrew the bushing.

    • Remove the bushing, and put it in bag #1.

    • The nut stays in for now.

  16. Disassembling a Monroe LA-160 calculator: stap 16, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 16, afbeelding 2 van 2
    • Do the same on the left side of the shaft.

  17. Disassembling a Monroe LA-160 calculator: stap 17, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 17, afbeelding 2 van 2
    • A close-up of the bushing.

    • It is hollow and threaded on the outside, 1/4-32 x 1/8", and the head is threaded on the inside for the set screw.

    • Its head is 0.296" x 3/16"

  18. Disassembling a Monroe LA-160 calculator: stap 18, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 18, afbeelding 2 van 2
    • On the right side, lift up the Lower Dials shaft by the arm.

    • You can now get to the nut. Remove it and put it in bag #1.

  19. Disassembling a Monroe LA-160 calculator: stap 19, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator: stap 19, afbeelding 2 van 2
    • Still lifting on the right side of the shaft, turn the shaft so that the cam on the left side engages the pin.

    • Now lift up on the left side of the shaft to free it.

    • The left side nut may fall off, or not. If it tries to escape, make sure you see where it went.

  20. Disassembling a Monroe LA-160 calculator: stap 20, afbeelding 1 van 3 Disassembling a Monroe LA-160 calculator: stap 20, afbeelding 2 van 3 Disassembling a Monroe LA-160 calculator: stap 20, afbeelding 3 van 3
    • Remove the nut from the left side of the shaft, or the floor, or wherever it ended up, and place it in bag #1.

    • Remove the Lower Dials shaft arm from the right side of the shaft, and place it in bag #1.

  21. Disassembling a Monroe LA-160 calculator, Removing the Lower Dials parts: stap 21, afbeelding 1 van 2 Disassembling a Monroe LA-160 calculator, Removing the Lower Dials parts: stap 21, afbeelding 2 van 2
    • The parts of the Lower Dials are fixed to the shaft using tapered pins.

    • During installation, the part is placed on the shaft, held in place, and then a hole is drilled through the part and the shaft using a taper pin drill bit.

    • Next, a taper pin is inserted into the hole until it stops, then it is pressed in with an arbor press. The pin is then cut or ground off.

    • Indicated is a hole in the Lower Dials driver gear for its taper pin.

    • In this dial spacer, the taper pin is clearly visible.

    • Rotating the shaft to the other side, we can see the over-enthusiastic application of a grinding head applied to the other end of the taper pin on the driver gear.

    • Meanwhile, the taper pin is again clearly visible on the dial spacer.

    • Removal of taper pins requires an arbor press and pin punches, and preferably a pin punch holder.

    • For this disassembly, you will need 1.1 mm or 1.0 mm pin punches, and you will need a lot of them, maybe ten or twenty, since they will often break.

    • Before you use a pin punch, cut it down to 1/4" or so using a Dremel or some other cut-off tool.

Conclusie

Wowzers!

4 andere personen hebben deze handleiding voltooid.

robertcbaruch

Lid sinds: 18-08-11

515 Reputatie

3 handleidingen geschreven

2 opmerkingen

Thanks for posting this. My LA-200X is not zeroing out one wheel when on 1(black). This will help me tackle the repair.

Jason Stahl - Antwoord

how to you remove the black knob on the right ? I am stuck here on mine

ftey2000 - Antwoord

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