Boxy Fisher Catamaran

Discussion in 'Multihulls' started by Fanie, Mar 11, 2009.

  1. outside the box

    outside the box Previous Member

    Hi again Fanie
    All good, it was just to say hey keep going as there are always others who will give yards of advise and never lift a tool to do what they propose others should do by listening to their worldly advise.
    I admire the fact you are doing it. I am also just doing it, so thought I would say hi and good on you with some shots from a boat that works to back up what you are doing.
    All the best.
    Craig
     
  2. outside the box

    outside the box Previous Member

    Hi again Fanie
    I just pulled some old weight calculations for the folding catamaran we designed for a client (mentioned in another thread) beams, mast, boom and hull sockets all aluminium 6061 T6, pins were titanium Ti-6A1-4V etc The weight for these came in at 478.177 kg for a 38ft sailing catamaran. The mast was wing section of 11mtrs above deck.
    The reason we did all work initially in aluminium is the client did not want to limit themselves to just their own design, instead wanting the system to be retrofitable to others designs. The client now has provisional Patent protection on the system.
    Like you even though we have run all the caluclations in House, we have employed the professional services of High Modulus (NZ) to run calculations for the composite Mast and boom and beams etc just to confirm our calculations are correct.
    We have a half scale of the design being built for the client in our workshop presently to prove the design prior to the full size being built.
    Regards
    Craig
     
  3. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    I finished the counter today. You can set a target amount of turns and it gives an audible alarm if the count is met.

    The pickup is a reed switch, and for those that didn't know, they are more sensitive to be activated towards the ends. The magnet used is a small round neo. This can be removed and used on the next jig. Positioning of the magbet is not critical and works over several cm's.
     

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  4. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

    Ingenious!
     
  5. Fanie
    Joined: Oct 2007
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    Location: Colonial "Sick Africa"

    Fanie Fanie

    Ingenious no. I thought every one have these things even at home :D

    December has been a real pain, all the places closed and most people on holiday, so naturally not much was done.

    Went fishing and playing with boats only two days :(

    Since fixed the laser cutter table's electronics up again. I used some of it's spares for a bobbin winder I built.

    I've also decided to change the bearings I've used from linear bearings to roller bearings. I've submitted the drawings to be laser cut this morning and I may receive the spares as early as tomorrow. New laser cutters, the previous ones (BEE) took months to get anything done.

    If you wonder what the purpose of the laser cutter table in the greater scheme of things has to do with boating, it will be used to 'plot' the profiles for the jig on.

    The PC still runs on win95 and is close to 200 years old. Ive asked my PC supplier to source me something newer, xp with a usb port so I can do the cad on the work pc and the one on the machine drives the motors. Transfer the files with a stick.

    So Manie, if you need your planks marked... size max is 2m700 x 1m900. Quite a large profile can fit on there. Larger than that one will have to split.
     

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  6. Manie B
    Joined: Sep 2006
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    Location: Cape Town South Africa

    Manie B Senior Member

    I will take you up on your offer but please dont strip the machine again for parts:D
     
  7. hoytedow
    Joined: Sep 2009
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    Location: North of Cuba

    hoytedow Carbon Based Life Form

    Ingenious yes.
     
  8. masalai
    Joined: Oct 2007
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    Location: cruising, Australia

    masalai masalai

    Evidence of genius at work, well done Fanie...
     
  9. farjoe
    Joined: Oct 2003
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    Location: med

    farjoe Senior Member

    Laser Cutter Data

    Fanie,

    Could you tell us more about the laser cutter you are using including sources and prices?

    thanks in advance.

    joe
     
  10. Fanie
    Joined: Oct 2007
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    Location: Colonial "Sick Africa"

    Fanie Fanie

    I'm building the laser cutter for our own use. We have lots of plastic parts to make from time to time. The laser cutter is 120W max, so you can cut most plastics with it as well as some other materials. The laser tube and HT psu is from China, my local spares supplier (Mantech Electronics) ordered the stuff for me.

    Stepper motors with a 3:1 planetary gearbox, sprockets and belts bought locally. The profiles is my own jig I designed and extruded with a local aluminum extruder. It is one of the higher grades alu (6061 or something) and it was surface hardened and anodised.

    For now I plan to use a pen like a big platter to draw the profiles with.

    Joe, if you plan on making something similar, it's fairly easy. There are lots of schemes for sale to use for the bearings and rails, ranging from expensive to very expensive - of course.

    I'm using Gecko drives and DesckCNC software, look at deskcnc.com, nicest software for CNC stuff I came across.

    It's only a combination of mechanical (junk :D) and some electrical / electronics.

    Masalai, I can't give you more points :D Get past Jeff and we'll talk again ;)
    Same to you too Hoyt. There's nothing fancy about this, any one that wants to can do this. I think you guys are just too lazy, am I right :D



    The parts I ordered was laser cut, but not bent yet. I may get them tomorrow.
     
  11. farjoe
    Joined: Oct 2003
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    Location: med

    farjoe Senior Member

    Fanie,

    Sorry, I was not clear enough in my request. I was referring specifically to the laser heads themselves.

    joe
     
  12. Fanie
    Joined: Oct 2007
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    Location: Colonial "Sick Africa"

    Fanie Fanie

    You can make the 'head' (a different term in the marine world eh :D) yourself.

    The beam gets reflected with special si mirrors, onto the center of a focussing lens. The one I plan to use has a focusing distance of 50mm. This gets adjusted for the material thickness so the 50mm focus point is in the center of the material. If your material is 2mm the dictance is adjusted for 49mm.

    The reflectors (mirrors) maintain their positions, only the focusing lens gets adjusted. You can do this by turning a knob or adjust it with a little stepper motor from the PC.
     
  13. farjoe
    Joined: Oct 2003
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    Location: med

    farjoe Senior Member

    I guess I am interested in sourcing the parts that make up a laser head. The marine head I will leave to somebody else.

    joe
     
  14. Manie B
    Joined: Sep 2006
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    Location: Cape Town South Africa

    Manie B Senior Member

    Fanie you probably have all this info
    but some of it may be updated
    it basically is the MARITIME LAW as things stand now
    rules - regulations - and endless legalities in sunny South Africa
    some of it will drive you nuts - so only read when a good mood

    http://www.samsa.org.za/index.asp

    :(
     

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  15. hoytedow
    Joined: Sep 2009
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    Location: North of Cuba

    hoytedow Carbon Based Life Form

    :p :p Laser head sounds dangerous. Safer too hang it over the side.
     
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