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Plug Gauge: Tool Steel Turned, Hardened, Ground and Lapped (Markham, 1908)
E. R. Markham · Public domain
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Plug Gauge: Tool Steel Turned, Hardened, Ground and Lapped (Markham, 1908)

A plug gauge is a hardened, accurately sized pin with a knurled handle, pushed into a hole to check its size. A set has one for each size gauged. E. R. Markham's Tool Making (1908) shows how to make one of tool steel: turn and stamp it, harden it at as low a heat as will do, grind it with water running on it to just over size, and lap it to size with flour emery and oil in a split cast-iron lap. Tool steel can creep in size after hardening, so for great accuracy he seasons it first. His figure is a 3/4 in gauge. He does not name the hardening bath. A case-hardened machinery-steel gauge is a separate blueprint. Source: E. R. Markham, Tool Making (American School of Correspondence, 1908), pp. 178-182. Picture: his Fig. 293.
Hejuru
Two days, plus seasoning if wanted

Amabwiriza

1

Read Markham

"Plug gauges are used to gauge the size of a hole, while a ring gauge is for measuring a cylindrical piece of work."
2

Rough out and anneal

Take tool steel a little larger than the finished gauge (square bar, turned round, is our choice of stock). Remove all the outside skin and block the gauge out close to shape, then anneal it thoroughly.

Ibikoresho by'iyi ntambwe:

Inkoni ya kare y'icyuma cy'ibikoreshoInkoni ya kare y'icyuma cy'ibikoresho1 bar

Ibikoresho bikenewe:

Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Icyuma cyo kuca cy'itoreroIcyuma cyo kuca cy'itorero
Ifuru ya muffleIfuru ya muffle
Amadarubindi y'umutekanoAmadarubindi y'umutekano
3

Turn, knurl and stamp

Rough out the bar, allowing enough to turn off the decarbonised skin. Turn the handle (B in Fig. 293) to size and knurl it, and turn and finish the neck (C). Mill a flat spot in the middle of the handle and stamp on it the size of the gauge and the name or mark of the part it gauges (some shops stamp on C instead). Stamp before finishing any gauging surface, as driving stamps stretches the steel. Then turn the gauging end (A) .010 to .015 in over the finished size to allow for grinding.

Ibikoresho bikenewe:

Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Icyuma cyo kuca cy'itoreroIcyuma cyo kuca cy'itorero
Igikoresho cyo gushushanya imirongo ku byumaIgikoresho cyo gushushanya imirongo ku byuma
Imashini ibaza icyumaImashini ibaza icyuma
Kashe z’inyuguti n’imibare z’icyumaKashe z’inyuguti n’imibare z’icyuma
InyundoInyundo
MikorometeroMikorometero
4

Harden

Heat the gauge very carefully for hardening: the lower the heat, the finer and more compact the grain, and a fine grain wears better. Quench it; Markham does not name the bath here. For great accuracy, leave the gauging end .0025 to .003 in over size and let it season, laid aside for a few months or a year, before finishing. Where there is no time, many shops draw the temper to a straw colour and let it cool slowly, several times over, brightening the steel each time so the colour shows; this softens the gauge, so it wears out sooner.

Ibikoresho bikenewe:

Iziko ryo GucuraIziko ryo Gucura
Ibikoresho bitazwiIbikoresho bitazwi
Amadarubindi y'umutekanoAmadarubindi y'umutekano
5

Grind

Grind on dead centres if you can (a worn lathe spindle copies its own error onto the work), with water running on the work to keep it cool; otherwise heat it as little as possible. Use a coarse wheel free from glaze to within .004 in of size, then a finer wheel to .001 in over. Always measure the gauge cold, since a gauge ground to size while warm will be small when it cools.

Ibikoresho bikenewe:

Imashini isena ibintu by’uruzigaImashini isena ibintu by’uruziga
MikorometeroMikorometero
Amadarubindi y'umutekanoAmadarubindi y'umutekano
6

Lap to size

Make a lap: a piece of cast iron with a hole bored a trifle larger than the gauge, split, and closed by a screw (Fig. 294); for much gauge work, a holder with split ring laps held by a pointed screw (Fig. 295). Lap the gauge to finished size with flour emery mixed with oil. Lapping warms it too much to caliper, so cool it in a dish of water at the temperature of the room where it will be used (about 70 F), not cold water, before each measurement.

Ibikoresho bikenewe:

Inkoni y'icyuma cyasuweInkoni y'icyuma cyasuwe
Ifu ya emeryIfu ya emery
Amavuta y'imashiniAmavuta y'imashini
Igikombe cy'IkirahureIgikombe cy'Ikirahure
Amazi YatunganyijweAmazi Yatunganyijwe
Igipima Ubushyuhe cy'UbushakashatsiIgipima Ubushyuhe cy'Ubushakashatsi
MikorometeroMikorometero
7

History and honest limits

Markham wrote for shops working on the interchangeable plan, where parts made years apart must still fit, so every piece is checked against gauges. He warns against needless accuracy: a gauge for work that may vary .005 in need not be made to .0001 in. He does not name the hardening bath or the heat; the 3/4 in size is his Fig. 293, and the heat source is ours.

Ibikoresho

1

Ibikoresho bikenewe

18

Iki gishushanyo gikora

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Agateganyo

Ibikoresho bipima ubugari bw'umwobo

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Reamer: a Fluted Hand Reamer Turned, Fluted, Hardened and Stoned (Markham, 1908)

Reamer: a Fluted Hand Reamer Turned, Fluted, Hardened and Stoned (Markham, 1908)

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