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crwdns2944351:0crwdnd2944351:0Disassembling Monroe LA5-160 calculator completelycrwdnd2944351:0crwdne2944351:0

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Monroe LA5-160 calculator
Type
teardown
Title
Monroe LA5-160 calculator Teardown
Introduction
Ever been at a garage/boot sale, flea market, or junk shop and seen a weird thing that looks like a cash register and a typewriter mated? These are electromechanical calculators which our dads and granddads used in the office because electronic calculators were far off in the future.
There are many of these now on eBay, but many of them are less than functional. The last time they were used was probably in the 1960s, and all the grease has probably congealed. Also, decades of being moved around and not being serviced means that parts go out of alignment or get broken by the well-meaning and the inquisitive.
Worse, the manuals and repair guides for these machines are either rare or nonexistent.
And so, this teardown guide will help you take this calculator to pieces so that the pieces can be cleaned, repaired, or replaced. And hopefully you'll learn a bit about the mechanisms that make these machines go.
Finally, DO use this as a disassembly guide. Ignore ifixit's warning that "Teardowns provide a look inside a device and should not be used as disassembly instructions."
Time Required Min
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Time Required Max
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Difficulty
Moderate
Author
robertcbaruch
Public
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  • 1.1 mm Pin Punch Bit x6 added.
  • 1/2" Wrench x1 added.
  • Large Needle Nose Pliers x1 added.
  • Pin Punch Holder x1 added.
  • Press-to-close Bag x20 4" wide by 6" high is sufficient. added.
  • Rotary Tool x1 added.
  • Flathead 3/32" or 2.5 mm Screwdriver x2 added.
  • Small hammer x1 added.
  • Small Vise x1 added.

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  • In Progress added.
  • Community-Contributed Guide added.