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  1. #16
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    Aug 2009
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    Sydney, NSW, Australia
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    Thanks Kryn i will need to order some more aluminium sheet i only have enough to complete the tank no baffles unless i design a smaller tank but really a 50 litre tank is perfect, how much will a shop charge to cut my pieces on the guillotine? my fit was ok for the bait tank as i cut it all to suit open corner welds

    if i could make a guillotine for my hydraulic press that would be cool if u know of any plans?

  2. #17
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    May 2011
    Location
    Murray Bridge S Aust.
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    Sometimes if you ask your supplier nicely they will cut the sheet for you, for free. Provided that there aren't too many pieces.
    Making a guilotine for the hydraulic press, is not an easy job, tolerances need to be very close, otherwise you'll just crimp/fold the sheet.
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #18
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    Aug 2009
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    Sydney, NSW, Australia
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    Are u able to cut alloy sheet on a table saw?

  4. #19
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    Aug 2006
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    Melbourne
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    Yes you sure can. I used to cut 8 mitre lengths of 5mm aluminium sheet with a circular saw. A blade with lots of teeth helps and use wax as a lubricant.

  5. #20
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    Com was that a table saw or a circular saw? i used a circular saw but i think my it may be easier if i can source a table saw just so its easier and i get my calculations right on size

  6. #21
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    Aug 2006
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    Melbourne
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    Yeah circular saw as mentioned. 235mm blade. Table saw would be easier for smaller items. You can always clamp guides to the material if using a circular saw so you get a straight cut.

  7. #22
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    Aug 2009
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    Thanks Com, I just imagine using the table much easier than calculating the blade to side once and remembering it a thousands times over lol i suffer from memory loss so often have to keep measuring or repeating measurements in my head as I'm cutting it all out so the table would just make it so much easier i will try find one

  8. #23
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    May 2011
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    Murray Bridge S Aust.
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    gazza, what I do with stuff like the saw measurements, is to write on the saw the distance to allow for on both sides, either in texta or white paint pen.
    Have a look on the Woodwork Forum for a table saw, sometimes they come up for around $500 +. FOR SALE:SA Industrial Duty Table Saw $500
    Kryn
    To grow old is mandatory, growing up is optional.

  9. #24
    Join Date
    Feb 2010
    Location
    Ballina, NSW
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    900

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    Table saw is fine gazza. Just go slow on your feed rate.
    With your welds - one of those pics had a weld on the right hand side really crowned up - and I assume very poor penetration.
    Do the air pressure test, brush all welds with soapy water and inspect carefully for any bubbles at all. Do not over-pressurise, you don't need much.
    I would get a flap disc out grind out any suspect welds back to a smooth rounded over corner and re-weld nice and hot.
    You will need to repeat the pressure/soapy water/rewelding step heaps of times. Even gun welders usually end up redoing a couple of pin holes.
    [edit] also... the idea of baffles is not only to control the unstable load in the boat, but also to stop undue continual flexing of the tank walls (from surging fuel) - which work harden, become brittle and then crack. Not much of an issue in a part-time tinny, but worth considering.
    Mick

  10. #25
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    Aug 2009
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    Sydney, NSW, Australia
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    Kryn i can only use a small portable model my shed is jammed as it is with tools, we need to move house so i need to make sure i have room for everything to come with me

  11. #26
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    Mick those welds are without a foot peddle just pre set amps and away i go, i think i welded this tank with the Magnium digitak ac/dc machine i only know half of the settings i now have a WSE-200 tig which welds really nicely and smoothely but i think i may have been low on the amps

  12. #27
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    Aug 2009
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    Trying to get the boat floor done guys weather pending, i am looking at more alloy welding but i think the fuel tank and this canopy combined would be a massive job for a novice tig welder like my self

    would i be better off keeping the tig machine and buying another mig welder with spool gun capabilities or a mig that can weld aluminium? or would i be better off selling my machine and buying something like a ESAB Caddy C160I or a C200I Mig which can do all of it?

    i am floating around with this idea as pictured but i am not 100% convinced with my tig welding alloy skills

    so what i am asking is if u were a learner to mig and ac tig which would u chose to do this canopy plus the fuel tank i am looking at probably 10-15 meters of weld combined for both things to be built

    if u would suggest a mig would the ESAB Caddy out perform the Unimig Razor 200?
    Attached Images Attached Images

  13. #28
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    Feb 2010
    Location
    Ballina, NSW
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    The fuel tank is best done by TIG. Actually, I'm going to put it out there that it is best done by someone else.
    The canopy could be TIG or MIG. It depends on what thickness material you're using, but I'm assuming 3mm+ in which case I'd reach for the mig. You could do it no worries by TIG, but it would take a long time and you would be more likely to buckle some of those big flat panels due to the additional heat input and distortion with the slower moving TIG.
    The canopy would be an ideal project for learning, unlike the fuel tank.
    cheers
    Mick

  14. #29
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    Aug 2009
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    Sydney, NSW, Australia
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    Yeah Mick i understand what your saying as leaking fuel tank can be a worry with electronics on the boat and electric start i think it may be a bit beyond my capabilities especially welding on the thick bulky fuel tank cap to the thin 4mm sheet the tank was going to be made from

    The canopy i think there will be that much weld it should structually be ok even if i weld inside and outside than grind back the outside
    Last time i bought a sheet of 4mm alloy cost me over $270 for 2400x1200x4mm i see there is cheap stuff floating about 2400x1200x3mm for around $150 from memory i have mig welded thick 6mm alloy and 1.6mm sheet on the bench with a Lotos spool gun and mig but i tried building a bait tank from 1.6mm sheet and absolutely melted the crap out of it
    That bait tank in this thread i used around 3/4th a tank of D argon welding it by tig so i would like to try mig again

    I was looking at the unimig mig 175 razor weld's chart it can according to the chart weld 2mm 3mm 4mm aluminium so i am trying to save some money to buy this machine, the thought had crossed my mind just to buy a workshop roll around mig the transformer type and run alloy thru that machine and gun a budget set up but i'd like some portability

  15. #30
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    Aug 2009
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    Sydney, NSW, Australia
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    I went and bought this mig welder this afternoon for $299 it is spool gun compatible, only down side it weighs a ton and duty cycle is 10% however for $299 i can afford to lose that

    https://sydneytools.com.au/product/i...gasless-welder

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