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I Forge Iron


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About patrick

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  • Location
    Janesville, WI
  • Interests
    Mokume, Tool Making, Industrial Forging


  • Location
    Beloit, WI
  • Interests
    Forging of all types
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  1. Bob, you can use the same canvas/rubber belting for the strap that is used for the drive belt. You nee two keys for each die. The are positioned on each side of the die in opposite directions. Taper is 1/8 inch per foot. The dovetail angle on my Bradleys is 5 degrees. Since this is a 2 wedge system you do not have a compound angle. Send me a pm if you have more questions. Id be happy to discuss details on the phone. Patrick
  2. I found the source finally. It comes from some Chambursburg literature on their self contained hammers. There is a table which shows that a 5000 lb hammer can work 10 inch square alloy steel on a production basis.
  3. Guys- I recall reading quite a long time ago that for efficient industrial forging a hammer should have 50 # of ram weight for every 1 square inch of cross section. Does anyone else recall this recommendation and where it came from? If I had to guess I'd say old Chambersburg literature but it could have been in an old book.
  4. Cooling rate determines the as quenched microstructure which in term strongly influences the stresses generated. Agition can increase or decrease cooling rate depending on how agressive it is. The are many other factors that influence quench related cracking such as part geometry so you really have to consider them all together if you are trying to prevent cracks.
  5. As i mentioned it can improve corrosion resistance, machinability and to some degree hardenability. It does indeed segregate to grain boundaries leading to hot shortness, but if the phosphorus content is not too high you could see those benefits. 12L14 is an example af a free machining grade that has both phosphorus and lead as Intentional additions to improve machinability. Most steels used in engineering applications consider it to be an impurity so there are not many examples of its use in modern steel making. Even in the historical context it was there not added on purpose but was a carry
  6. In wrought iron phosphorus can provide some corrosion resistance. In some low alloy steels it is added to aid machinability but those are exceptions. In bloomery iron making it would most likely have been an impurity in the ore or maybe in the coal if mineral coal was used for fuel. Today it is an Intentional addition to liquid steel during steel making.
  7. I dont recall the motor pully size for you machine. Mine are 8 inch. I know of another smaller Bradley that was set up with a jack shaft a d uses a pulley in the 20 to 30 inch diameter. This set up is more loke what would have been used if the hammer were connected to a line shaft. This large shaft pulley has the advantage of giving you nearly instant single blows which is tough to do with the small pullys.
  8. I can't think of anything specific you would need to arrange with a forging company that would be different than with any other company. You need to know exactly what you want them to produce and you need to clearly communicate your expectations. You need to clearly understand the needs of your customers, including industry and customer expectations. These are all things you'd have to do with any company though. Patrick
  9. Case hardening or case carburizing where carbon is added to the surface of an item through diffusion processes can have widely varying depths depending on the time and temperature used. In industrial practice I have seen things like rail road bearings with effective case depths of 0.100 inches. Another method of increasing surface hardness is to expose the item to a high nitrogen environment. Usually that is done with steels having about 1% aluminum. The aluminum reacts with the nitrogen to form a uniform aluminum nitride coating. This coating is generally only about 0.010 inches thick b
  10. I run a 300 and a 500 Bradley guided helve both using the canvas rubber belts already mentioned. I am using the 8 inch diameter motor pulleys recommend by Bradley and i don't have any issues with belts heating. You need to have the belt tight enough without any load that it will stay in motion but not grab the drive pulley. Others, i turn the motor off between heats to avoid getting a hot spot in the belt. I do find that extra tacky belts can be helpful so i apply honey when needed. If they are too tacky dust with baby powder.
  11. Wow that was a long time ago, Thomas, probably 18 yrs because i was still living in ohio when i got those bars.
  12. I was able to do a quick review of all my posts and found several that are promising. Thanks for that tip Irondragon. Thomas-I forgot to ask you what kind and size of hammers you got? Will you keep them all and set up a school? You are a fantastic teacher! Patrick
  13. Thanks guys. Thomas-Things are going well and life is full. I got the 500 lb bradley running last fall. At the moment most of my time is going into building a shop for Josiah. Annabelle is wrapping up her senior year and work is full of fun projects including some new interns starting an just over a week. I've been asked to consult on the metallurgy portion of a new book on knifemaking which is why I was looking for my old posts. Many of the errors I see in the manuscript I addressed in those old posts. The bulk if the book is very well done and I find it very enjoyable to read so I think
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