Northwest lad
New member
I have a couple of those old wooden smoothing planes. Need an iron for them.
Does anyone have any ideas on who sells them?
Does anyone have any ideas on who sells them?
The supply of genuine old irons for wooden planes must be drying up. I doubt if anyone makes them any more - not enough demand. "Iron" is a bit of a misleading term. Like Sorby chisels (and muliple other mainly Sheffield-based manufacturers) they would probably be cast carbon steel - anything up to about 0.8% carbon hardened and tempered (compared with non-hardenable mild steel with only 0.1% carbon). Cast iron is a difficult animal altogether - as far as I know not ideal for cutting tools. There's not much steelmaking left in the UK. Even if you could get hold of some carbon steel of the right dimensions, the cost of turning it into plane irons would be prohibitive.I have a couple of those old wooden smoothing planes. Need an iron for them.
Does anyone have any ideas on who sells them?
That's good news Nigel and I'm happy to be proved wrong. I left the alloy steel industry 35 years ago in favour of woodworking, so I'm probably out of date!I have bought plane irons for wooden planes from G&M Tools hence my post above. They sometimes have new, old stock available, and at a price that's not too expensive.
Nigel.
That's good news Nigel and I'm happy to be proved wrong. I left the alloy steel industry 35 years ago in favour of woodworking, so I'm probably out of date!
If later Sheffield 'irons' were oil-hardened, they must have been medium to high carbon alloy steels. The alloying additions to steel (typically 3% chromium plus a bit of molybdenum) would improve hardenability so oil-quenching or even air cooling instead of the more drastic water-quenching would achieve the required hardness (at higher cost because of the addition of expensive alloying additions). The earlier irons would have been plain carbon so would have needed quenching in water to achieve the rapid cooling needed to harden the steel. The same hardness can be achieved from a range of carbon contents, alloy content and tempering temperaturesThe early sheffield irons were some kind of water hardening steel, and usually cut hollow in the back to create a bias for good bedding in wooden planes. They're laminated, of course. How much carbon is in them is hard to tell - 0.8 and 1% carbon are hard to tell apart at same hardness unless you have some way to wear test them.
Later sheffield irons are solid and feel more like oil hardening steel on the stones (and unlike the earlier ones, they're flat wedge shaped and solid steel from end to end - and usually a tad thinner in double irons). nobody makes anything of the sort except for steve voigt as far as I know (in new slotted irons), but he's making them for his planes. Or rather, he's having LV make irons for him (or at least was) and making his own cap irons.
If anyone ever does come along making them in volume for wooden planes, they'll probably be like the later solid sheffield types, which aren't that great because the little hand made biases aren't in them, nor is tapering by width along their length.
I didn't know there was an old tools shop in Stalbridge. It's not that far from me so I'll have a look when I'm next in that part of Dorset.I had a look at Old Tools UK but they were more expensive than anything that I've bought from G&M. There is also The Vintage Tool Shop in Stalbridge locally, although I have never bought anything from them.
The Stalbridge Shop – The Vintage Tool Shop
Nigel.
If later Sheffield 'irons' were oil-hardened, they must have been medium to high carbon alloy steels. The alloying additions to steel (typically 3% chromium plus a bit of molybdenum) would improve hardenability so oil-quenching or even air cooling instead of the more drastic water-quenching would achieve the required hardness (at higher cost because of the addition of expensive alloying additions). The earlier irons would have been plain carbon so would have needed quenching in water to achieve the rapid cooling needed to harden the steel. The same hardness can be achieved from a range of carbon contents, alloy content and tempering temperatures
Metallurgy not my thing but all the old woody planes I've seen (with blades above 2" wide or so) have laminated blades - thin hard steel on the face and thick softer stuff on the back. Otherwise they'd be a pipper to sharpen. I doubt anybody today makes them laminated but I could be wrong. Which means if you buy an old plane it's going to cost far less than new blade and probably be far superior.
I'd never heard of O1, probably because I left metal manufacturing in 1985. So I looked it up as you suggested. It's a wrought alloy steel but I couldn't see a standard specification for it. My time in metal manufacture was in cast steels and nickel alloys, so most of the specifications I came across were for cast alloys - mainly ASTM series, British Standards and German Werkstoff series. 3% chromium, 0.5% moly, 0.3% carbon was a common steel for structural applications needing strength and toughness, with higher carbon for cutting tools.Look up O1 - less alloying than that. Just enough for them to through harden in thicker cross sections than water hardening steels. I haven't looked up the alloy in a while, but would guess molybdenum and a very small amount of chromium.
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