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Patrick Hastings

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Patrick Hastings last won the day on January 10 2016

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    Cudahy, Wisconsin

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  1. Some more information on the "pitch" might help. what kind is it? Receding from the piece sound very strange, is it like shrinkage or is it just slumping away like melting icecream? The matsuyani I use can catch on fire it does not really hurt it so I use a large torch head or if I am out I use a heat gun. The pieces I generally remove cold by sending a punch into the pitch near the item. The shock wave dislodges the piece most of the time with very little pitch attached. otherwise on more delicate items the pitch is gently heated until the piece can be plucked from the pitch and then
  2. Silicon source for Silicon bronze is the "prealloy" FerroSilicon. Just throwing pure silicon source into the melt won't work so I am told. The Iron lowers the melt point of the silicon making it compatible with the copper melt. The iron is not a desirable element in the bronze, but you will see it in the compositions, its always there in tiny amount as a result of the FerroSilicon. I don't have a source for the FerroSilicon, but I know it is generally not a home made product. hope that helps, Patrick
  3. Almost ready to come out of my post class coma... I think your on the right Path, Kevin. I suspect that you may gain much insight in short time watching over a live shoulder. Patrick
  4. Thanks guys! Ric I think I might have something for you. Here is a shot of the size range mounted up ... Patrick
  5. This batch is going to my Japanese metal working class, but you will be able to order from the next batch in a couple weeks if your interested in getting some. I need to weigh them and get updated photos on my website. Patrick
  6. My new line up of Tiny hammers. .5", .625", .750, 875" diameters. 1144 strain hardened steel, double tapered holes. Patrick
  7. Ah, I thought it might be that, but did not have the time to dig it out. Patrick
  8. what happened to this thread? I Had two responses on here yesterday. Patrick
  9. You know mine could have been over fireing It was quite awhile ago. But the numbers came from paper so I still think 1500F is a good temp. My cycles were about 10 hours and the bond was great. I love those big chunks, keep updating the thread. Patrick
  10. Hey there Justin, That is a great looking billet. When I was exploring Brass and copper Mokume My research on the Phase diagrams led me to a temperature of 1500F being a little safer. The danger is The formation of Eutectic between any of the metals present which is the lowest melting point possible between two or more metals. The Zinc soaking into the copper is really the formation of Eutectic alloy which given enough time and temp will convert the entire billet to a puddle even though the temperature may have never exceeded the melting point of the original alloy and copper. 1500F is a mu
  11. You need to use Lubrication be it burs, Abrasives, or Files. Specialty files for aluminum have a tooth pitch up to 1/8 of a inch to eliminated loading or at least make the file easily cleanable, Mcmaster sells them. I used to make Jian out of 6061 bar stock. I settled on 24 grit Zirconium belts and slower belt speeds with lubrication. WD40 worked well enough, but there are all sorts of commercial lubricants for belts and tools. Patrick
  12. Ok, A 4" wheel happens to make that one simple! It has roughly 1ft of surface So Your final RPM is roughly the same number as your SFPM! so with your pulleys and motor you will have a max SFPM of 3500. Enjoy your new grinder! Patrick
  13. A full key way shaft would not deter me from threading the end, but that's me. Again you can do a partial key way on the shaft with out a mill. pulley sizes do not matter as much as the relative size between them. Your looking for ratios. A 2" 3" 4" has circumferences of 6.28, 9.42, 12.56. So a 2" to 4" is a 2/1 ratio and would roughly cut your motor RPM in half reverse that and it will double it. what is too fast or too slow is influenced by the circumference of your drive wheel. Bigger wheel more Surface feet per minute. Patrick
  14. Well besides having a machine shop or a friend with the right tools to modify a shaft, You could do some simple things to make it work. Mark and center punch the end drill and tap. having the hole perfectly centered will not have a significant effect on balance so it is ok to do this all this with basic power tools and hand taps. Key ways on shafts are typically done on a mill, but there is not a lot of shear force on a grinder setup so the full strength of a proper key is not really required. One way to make a simple key is to place the pulley on the shaft drill and tap a hole between the
  15. I have been putting a lot of thought into studying it. I believe that there are two zones they occure most strongly between the point where the work contacts the belt and the drive wheel. As the drive wheel turns it is pulling the belt through the resistance of the work so this is the higher tension side. On the other side leaving the drive wheel and being fed to the work is the lower pressure side. I made my drive wheel the tracking wheel thinking to help avoid the top wheel design issue. I would put it on the bottom wheel so that it acts as both tension and tracking, but it is on the freaki
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