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Stone Carving Chisels: Mallet-Headed Plain and Tooth Chisels and Points for Soft Stone (Holford, 1907)
H. Holford · Public domain
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4. novembre 2026NO
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Stone Carving Chisels: Mallet-Headed Plain and Tooth Chisels and Points for Soft Stone (Holford, 1907)

Soft stone such as limestone and sandstone is cut with chisels struck by a wooden mallet, so their heads are broad and a little rounded. H. Holford's 20th Century Toolsmith and Steelworker (1907) shows a set: plain chisels, tooth chisels with a row of sharp teeth, and points, forged from 3/4 inch octagon steel of 75 points carbon and tempered a very pale blue. He gives no lengths, widths or tooth spacing; those are unknown here. The brine bath is from his chapter on the hardening bath. Source: H. Holford (1907), pp. 21, 131-133, 140-141. Picture: his Fig. 71.
Intermedio
A day for a set

Istruzioni

1

Read Holford

"In cutting soft stone of any description wooden mallets are used, consequently the heads of the tools are made broad and a little rounding, so as not to cut or bruise the mallet."
2

Forge the mallet heads

Use 3/4 inch octagon steel of 75 points carbon. For each tool, upset the head end a little, fuller it in, draw it out, then swage it to its broad, slightly rounded shape between top and bottom swages (Fig. 78). For a narrow chisel, forge the head first; for a wide one, forge the cutting end first. Sizes are not given (unknown).

Materiali per questo passaggio:

Barra ottagonale di acciaio per utensiliBarra ottagonale di acciaio per utensili1 3/4 in octagon

Strumenti necessari:

ForgiaForgia
IncudineIncudine
Martello da fabbroMartello da fabbro
SlittaSlitta
Fuller (ferro da scanalare)Fuller (ferro da scanalare)
Stampi superiore e inferioreStampi superiore e inferiore
Tenaglie da fabbroTenaglie da fabbro
Dimensioni sconosciuteDimensioni sconosciute
Occhiali di sicurezzaOcchiali di sicurezza
Guanti resistenti al caloreGuanti resistenti al calore
3

Forge the chisels and points

For a wide chisel, upset the end to the width of the chisel before drawing it down to a thin cutting edge. Hammer the flat surfaces. Draw the points down to almost a square point (Fig. 72). For tooth chisels, punch the teeth into the edge in a punch machine after the flat surfaces have been hammered, then file each tooth to an extremely sharp point.

Strumenti necessari:

ForgiaForgia
IncudineIncudine
Martello da fabbroMartello da fabbro
Tenaglie da fabbroTenaglie da fabbro
Pressa punzonatricePressa punzonatrice
Lima fineLima fine
4

Harden the chisels

Heat the cutting edge very evenly along its whole length and dip it at least one inch into the hardening bath (clean water, best as a strong brine, kept large and cold). Polish it bright by rubbing it across a board spread with fine clean sand near the forge, and draw the temper to a very pale blue, the right temper for all limestone tools.

Strumenti necessari:

ForgiaForgia
Salamoia saturaSalamoia satura
TavolaTavola
Sabbia fineSabbia fine
Tenaglie da fabbroTenaglie da fabbro
Guanti resistenti al caloreGuanti resistenti al calore
5

Harden the points

Dip the points deep into the bath. Draw the temper so it shows at least 5/8 inch back from the point; if it runs so fast that only the very tip is tempered, the point bends and breaks easily.

Strumenti necessari:

ForgiaForgia
Salamoia saturaSalamoia satura
TavolaTavola
Sabbia fineSabbia fine
Tenaglie da fabbroTenaglie da fabbro
Guanti resistenti al caloreGuanti resistenti al calore
6

History and honest limits

Holford sets the soft-stone tools apart from those for granite and marble: soft stone takes wooden mallets, hence the broad heads, and a very pale blue temper. The finest stone carvers' tools, struck only lightly, he hardens without drawing any temper at all. He gives no lengths, widths or tooth spacing; the tools used to make them are ours.

Materiali

1

Strumenti richiesti

15

Questo progetto realizza

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Blueprint correlati

Questi blueprint condividono conoscenze — tecniche, materiali o principi

Stone Carving Hammer: a Granite Cutters' Mash Hammer (Holford, 1907)

Stone Carving Hammer: a Granite Cutters' Mash Hammer (Holford, 1907)

di ForgeNO

Lavorazione dei metalli

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