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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Nora<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In English that screw press with weights is called a ‘fly press’. They are very useful in that you can use them for pressing oil during the summer and with a change of tooling, make briquettes when available.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It is possible to use a spreadsheet to optimise the production by changing the thread pitch and handle length. This was done with a screw press used for marula oil pressing used at Swazi Secrets which makes (of course) marula oil. See <a href="http://www.newdawnengineering.com/website/oilpress/marulapress/">http://www.newdawnengineering.com/website/oilpress/marulapress/</a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The force generated is much greater than the ‘apparent’ pressure from the thread and the arm length because the weights have momentum. This allows for more rapid throwing of the handle downwards before starting to do the ‘real work’. Using the two-arm approach a single person can do most of the work and a second person join them for a minute or so when the last crunch is needed. These presses have a working life time of decades, not months and of course have no hydraulics. The pressure (over the whole long range, can be 1-2 tons.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If someone wants to calculate such press parts contact me directly for assistance.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>When the distance travelled is known clearly, it is more efficient to use an over-centre clamp like a CINVA Ram or Terrabric mechanism which can run to 7 or 14 tons respectively. Again, no hydraulics and makeable in an ordinary machine shop.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:#1F497D'>+++++++<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi!<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>(little correction: i am a Hungarian born Hungarian citizen, and now living in Hungary again :).. i was just studying in Holland)<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>When seeing the design from Haiti we were a bit afraid of using springs for ejection, so we really wanted to push from the bottom.. And that was a challenge with the spikes that make the holes.. And then my colleague had the great idea with the two-way lid. (He is called Attila, I include him in the list) And I dont think it should make much difference that the holes are rectangular. <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The other great idea of his, which i am not sure if u can clearly see from the pictures, is that one of the lids is actually a tray that should slide under the briquettes after compressed (and pressed above the mould), and when you lower the jack, the briquettes just stay on the tray and can be moved (we will probably make another one of these, to save time like with the two mould sets with the legacy press). When we were testing the press, we had a little accident with the jack, so I am not 100% sure yet whether the tray will leave the briquettes intact(ish) but the first try when the jack was working was promising. <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The fabricators are of a small coop from another very poor region of the country. (They are actually also Roma/Gypsy). A friend NGO set us up with them, and they were really great to work with.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Sure we would be very happy to make a manual out of this, but I first want to wait until we can properly test it and hopefully make a second prototype soon. The material costs were quite high which would be quite good to reduce. <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I attach a collection of images and some info on presses that can be used as inspiration. (I think it would be really interesting to experiment with the screw press with the weights).<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks for your support!<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>All the best,<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Nora <o:p></o:p></p></div></div></body></html>