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Sam Salvati

Japanese spring hammer photos

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Credit for these photos goes to Rob Whitehurst of the gulf coast blacksmiths. This is a japanese "spring" hammer, mostly similar to most mechanicals.

 

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Edited by Sam Salvati

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Thanks John! Where did you get yours? I know of one for sale in the US right now, but have ever ever seen one before.

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Thanks John! Where did you get yours? I know of one for sale in the US right now, but have ever ever seen one before.

 

arnon at http://www.kandkforgeworks.com/about.html

 

he spent alot of time in asia forging japanese knives. he has the same hammer.

 

i bought mine in a old wooden box and restored it. making the missing pieces.

 

 

murray carter uses the same http://www.youtube.com/watch?v=mFxq5hzkTig&feature=channel_page

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the anvils on the jap power hammers seem to be quite small for the size of the ram, does anyone know what ratio they are?

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the anvils on the japanese power hammers seem to be quite small for the size of the ram, does anyone know what ratio they are?

 

 

mine is about 10:1

Edited by john marcus

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Really interesting. Those hammers look much more lightly built than the typical Western version. And what are they mounted on?

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in japan they are often floor mounted and worked from a pit.

 

mine is on a stand. they are lighter than many blacksmith hammers as they were optimized for knife making.

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These look like a possibility as a DIY for bladesmiths to me.

 

The hammer Sam posted pictures of has only four welds, that I can make out at least. Granted the ram guides are cast and so are the pulley, the eccentric, and the flywheel. The knuckles that hold the arms connected to the spring ends might be welded or possibly machined. This hammer looks like it could be sold as a kit and then assembled by the purchaser. Aside from cutting the steel for the ram and the anvil, most modestly equipped home shops could put something like this together. Especially if the pulley, flywheel, eccentric, spring knuckles, etc. could be purchased off the shelf. Having to pay to get welding done on some parts could drive the cost up but, there still are a lot fewer welds then other homebuilt power hammers I've seen.

 

Looks like these hammers are intended to be mounted permanently in place. A bit of a different philosophy then here in the US where even large industrial tools are made as portable as possible. The frame is quite adequate when you consider that it is bolted to the floor. As long as the floor is adequate that is! Seems like the anvil and frame are attached to a massive block of concrete.

 

John's hammer has a cast guide for the spring assembly plus another guide for the ram. The guide for the ram does not match the other parts of the hammer and looks like it was added on later. Also, John's hammer is lacking a flywheel. I wonder if the flywheel acts as a counterweight for the eccentric? If so, it could explain the two guides on John's hammer vs. the one guide on the other hammer.

 

I cannot quite make out the clutch system from any of the pictures but, I assume that the lever at bottom right of the front of these hammers pushes an idler wheel that takes slack off of the belt on the pulley.

 

These are quite interesting mechanical hammers. Thanks for posting the pictures Sam and John.

 

~Bruce~

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John,

what is that material between the springs that is holding your ram? it looks like some belting of some sort.... the hammer looks like a nice size for refined work...

Dick

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John,

what is that material between the springs that is holding your ram? it looks like some belting of some sort.... the hammer looks like a nice size for refined work...

Dick

 

 

cut from a conveyor belt 4 ply

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These look like a possibility as a DIY for bladesmiths to me.

 

 

John's hammer has a cast guide for the spring assembly plus another guide for the ram. The guide for the ram does not match the other parts of the hammer and looks like it was added on later. Also, John's hammer is lacking a flywheel. I wonder if the flywheel acts as a counterweight for the eccentric? If so, it could explain the two guides on John's hammer vs. the one guide on the other hammer.

 

I cannot quite make out the clutch system from any of the pictures but, I assume that the lever at bottom right of the front of these hammers pushes an idler wheel that takes slack off of the belt on the pulley.

 

These are quite interesting mechanical hammers. Thanks for posting the pictures Sam and John.

 

~Bruce~

 

 

what you are calling a flywheel is a brake drum,,,,,, some have them some dont

 

the clutch is a cone...the pedal brings the two (male/female) together one piece is always turning pretty simple stup up.

 

i fabricated and or replaced quite

a few parts including the ram and its guide....original was cast.

Edited by john marcus

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bruce. here is a brake picture it releases as the clutch engages

mcclutch2.jpg

Edited by john marcus

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One bad hydraulic cylinder, few I beams and old tire tube. I think

that this hammer can be made at home.

 

 

would be nice to find a clutch assembly ready made

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You could go with a friction drive similar to the tire hammer, and it would work very well IMHO.

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those are really sweet looking hammers--- my scranton shares ALOT of the same stuff--- spring style- linkage- braking-- the only real differance between my hammer and these are the fact i have a larger cast frame and much much heavier front guides...... are any of these for sale in the usa ?

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Hi Ya'll

 

As I begin to build my forge again I watched a video of a Japanese smith using the same type hammer as John's and Murray's. I can't explain it but it just felt right. I will build this type with maybe a nod towards the tire type hammer. When I found this thread with the great pictures I was ecstatic. So I am going to resurrect this thread and ask some questions.

 

John, you said that the connection material is simply conveyor belt material. How did you secure it? Also,it looks like the ram is simply lashed to the conveyor belt material with a lift strap webbing-true? I will need a high arch spring set. Any ideas where to get it? For some reason I like this better than a Dupont setup like on a Little Giant (sold my 50 pounder years ago). Anybody have any thoughts on this?

I plan on buying an Oilite sleeve bearing and boring out some steel tubing to accept it for the ram guide, then turning and polishing the ram to fit. Anybody see any issues with this idea.

 

Since my setup will lean towards a traditional Kagi-ba this hammer will fit right in.

 

I suppose I should concentrate on building the forge first but my imagination ran away with me when I saw this type of hammer.

Edited by Danocon

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Dano, hello!

 

Hi Sam,

 

How Ya' Doin'?

 

Thanks for starting this thread and the great pictures

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You know, that first one looks exactly like the one in Yoshindo Yoshihara's shop in the book "The Craft of the Japanese Sword"

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