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John N

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John N last won the day on October 15 2021

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About John N

  • Birthday 04/18/1975

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    Manchester UK

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  1. I jump as many grits as possible. I regard each successive grit as only removing the 'ridges' from the previous one, not grinding 'virgin' steel, just knocking the ridges off. I dont see the point in doing this progressively. I don't get on with 24g belts, but never tried a quality one, on a suitable machine. 36g ceramics sometimes. I generally go 60 / 120 on the belt grinder. Its only a couple of passes at 120 to move the ridges from the 60 grit. All the work is done with the coarse belt. I then hand sand (or use a wet stone grinding wheel, but that's not relevant to
  2. Knives look great (beautiful) - I'm in the camp that the edges are probably too flat for general purpose board work on 2 of them. (chefs are fussy buggers!) I played around with lots of edge profiles, and the ones that seem to work best are similar to all the popular and well regarded Japanese and European blade shapes (production and custom, they are similar). My opinion is they evolved over hundreds of years to that shape, as that's the shape they work best.
  3. I would 'buy and try' - it looks good to my (virtually) untrained eye. It can always be sold again, and you are only out the shipping!
  4. As has been mentioned, a hammer like that needs to be about 300 bpm. You have no real mass in the ram, so need to get some velocity into it to get forging energy. Spring rate is wrong, among lots of other things, but get it wound up to a decent speed, then address the other issues as they will make themselves known.
  5. thanks Alan! - if you push hard enough it will start to move eventually!
  6. I'm working on these two machines at the moment! they are just so pretty I thought they should get their own thread! The 2 cwt is my personal hammer, now rebuilt after the fire. The 1 cwt is off to a customer. In the UK both of these machines are regarded as 'Rolls Royce' Not often you see them side by side in nice condition They are both ready for testing next week. Busy busy!
  7. kind of agree (but disagree ) If they are going to be regularly used, use a bit of 'good stuff' for the dies if you can! You will get deformation, and scale is very abrasive. They will end up looking like a dog chewed them, after a while, if they are soft. Beauty of a press is you can get away with sub optimal dies for a lot longer than you will with a power hammer though!
  8. Good honest review, it confirmed a few thoughts I had about the press capacity (I worked it back to 7.75 metric tons from the available data online) It will be worth keeping hold of the small cylinder, as the bigger 8" stroke one has stolen 2" or more of your 'daylight' - which might be a PITA if you want to use the press for punching operations etc! In the UK 'stop blocks' are commonly called 'kiss blocks' - they are usually positioned well off to the side of the die block in use, you really only want to 'kiss it' as it will ramp the press slide over if there is any ex
  9. put some clothes on the blade I posted up last week! Handle is micarta, and Walnut. Im not 100% convinced, but its growing on me a bit.
  10. new machine day is a happy day! Congrats Your cart might need beefing up a bit, the hoses will push and pull a bit when they are loaded up!
  11. I would strongly recommend leaning back and squinting when you load that up! please don't put 20 ton on it, even if you re-weld it. Welding over a bad weld is still, errrm, you know. Not easy to visualise the forces involved, but if a 20 ton anvil block was hanging from a crane, with your press frame as the link, would you stand under it?! - I don't mean to be 'that guy' but better to excercise a bit of caution!
  12. A 'log splitter' press is a very good option, just try and brace the frame, and remove some slop from the moving parts, the frames are really not designed for the 'dead stop' every 1 second you get forging! The power pack on this press is basically 'log splitter' with non standard pump / motor configuration!
  13. A lad I have got to know quite well, Josh, is making some very nice grinders, and accessories. Small outfit, but Josh really cares about making stuff 'right' at a good price point! https://manchestergrinders.co.uk/
  14. not quite yet. there is some heavy spread sheet action going on at work! I have substantially improved and simplified the design, and need to finalise that, and grow a bit of confidence to 'pull the trigger' to make them in batches. Its a bit outside my current comfort zone, as we generally work on 'one off' very big forging machines
  15. Its all quite interesting when you get into it a bit! I am quite liking the simplicity of hydraulic formula! This press is 90mm bore cylinder, which from memory gives 12.3 metric tons (not american short tons!) @ 2500psi. (thats about 8.5 amps, on a 240 volt single phase supply) 1.5 kw motor. Cant remember the ram speed, but that 'is what it is' - the press was designed with power & tonnage in mind, the speed is the 3rd part of the formula, so is what it is! The frame is grossly over engineered, but its functions are more than 'stretch resistance' - We modelled the
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