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  1. #151
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    Thanks guys for your suggestions. I’m thinking the 2 pack epoxy is the way to go. Sounds like an acid wash is important beforehand so any problems with getting that on the corrugated iron walls? Or just be careful. Any thoughts?

    Mark

  2. #152
    Join Date
    Mar 2013
    Location
    Mt Pleasant SA
    Posts
    126

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    Hi Mark, I was paranoid about the acid etch coz all my machine tools were in the shed, let alone what it might do to the Colorbond. My 18 x 9 floor, laid 2 years before coating, had two contraction gaps sawn in after laying, dividing it into three 6 x 9 'bays'. I moved all the machines .. plus everything else .. into two of the bays & the 'pro' I mentioned diamond ground the floor to be coated (his suggestion) instead of etching. The machine used was vacuum extracted & done wet & just like what was used for Terrazzo decades ago, a big 3-brush 'floor-polisher' with diamond cutters replacing brushes. I might add here that coz the shed had been in use, as well as housing the machine tools, as domestic storage & garage for truck & tractor while our house was built, the floor had some oil stains which I treated with Shell degreasing fluid/water rinse 3 times, then saturated the 'spots' (patches 1-2ft diameter) with mineral turps topped with a heap of garden lime 'poultice' for a few days, swept off & repeated till no sign of oil stain & no water-break. You obviously won't have this problem, I include it for others. Then followed 'musical chairs', the 'pro' applied two coats of Epirez, a week or two to harden thoroughly, move the machinery etc to clear another 9 x 6 bay & repeat, degrease, diamond grind (done wet), coat, cure .. & repeat. So, sorry can't help you regarding acid etch/ galv walls.
    An unintended benefit from the diamond grinding was an even flatter floor .. the real reason to clear off the hygroscopic-salt-rich top layer of concrete slurry. No way could I countenance hydrochloric acid, the worst of the common acids for volatility, near the machines. Maybe citric or lactic acid (CLR) but no guarantees for your galv. Ha ha, just realised, acid etch would have been exciting .. the shed mob had used marble aggregate in the concrete..

  3. #153
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

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    Quote Originally Posted by swarfless View Post
    No way could I countenance hydrochloric acid, the worst of the common acids for volatility, near the machines. Maybe citric or lactic acid (CLR) but no guarantees for your galv. Ha ha, just realised, acid etch would have been exciting .. the shed mob had used marble aggregate in the concrete..
    Apparently acid etching (even HCl) is only a problem if too strong an/or too much acid is used and there was no concrete there to neutralise it. Once the bubbles have gone the acid is effectively neutralised and therefore inactive. The main (Colorbond clad, galv frame) workshop areas in our ~140m^@ mens shed had an acid etch done on the concrete floor prior to a hard coat finish being applied by professional finishers and I also queried possible side effects, but was assured there would be no problem especially if the Evap AC fan was running during the etch. Some 5 years on there have been no obvious side effects.

  4. #154
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

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    My carport (colorbond and duragal columns) was etched/painted about 3 years ago and no negative effects so far. I definitely avoided pouring the acid directly on the gal columns and was happy to leave 100mm or so around them that didn't get etched.
    Mechanical prep would be nice but generally costs more than a few liters of acid and some time.

    Steve

  5. #155
    Join Date
    Dec 2019
    Location
    Sydney
    Age
    72
    Posts
    26

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    When soldering galvanised sheet, the surface is etched with Muriatic Acid (another name for Hydrochloric Acid). The acid cleans the surface and preps it for solder to 'grab' the base metal. We were always taught to thoroughly wash the metal after using acid as an etching method. I would keep undiluted Hydrochloric well away from any metal posts or sheet - I suspect that otherwise you are asking for a future corrosion experience.

    Ted

  6. #156
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

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    Quote Originally Posted by swarfless View Post
    Hi Mark, I was paranoid about the acid etch coz all my machine tools were in the shed, let alone what it might do to the Colorbond. My 18 x 9 floor, laid 2 years before coating, had two contraction gaps sawn in after laying, dividing it into three 6 x 9 'bays'. I moved all the machines .. plus everything else .. into two of the bays & the 'pro' I mentioned diamond ground the floor to be coated (his suggestion) instead of etching. The machine used was vacuum extracted & done wet & just like what was used for Terrazzo decades ago, a big 3-brush 'floor-polisher' with diamond cutters replacing brushes. I might add here that coz the shed had been in use, as well as housing the machine tools, as domestic storage & garage for truck & tractor while our house was built, the floor had some oil stains which I treated with Shell degreasing fluid/water rinse 3 times, then saturated the 'spots' (patches 1-2ft diameter) with mineral turps topped with a heap of garden lime 'poultice' for a few days, swept off & repeated till no sign of oil stain & no water-break. You obviously won't have this problem, I include it for others. Then followed 'musical chairs', the 'pro' applied two coats of Epirez, a week or two to harden thoroughly, move the machinery etc to clear another 9 x 6 bay & repeat, degrease, diamond grind (done wet), coat, cure .. & repeat. So, sorry can't help you regarding acid etch/ galv walls.
    An unintended benefit from the diamond grinding was an even flatter floor .. the real reason to clear off the hygroscopic-salt-rich top layer of concrete slurry. No way could I countenance hydrochloric acid, the worst of the common acids for volatility, near the machines. Maybe citric or lactic acid (CLR) but no guarantees for your galv. Ha ha, just realised, acid etch would have been exciting .. the shed mob had used marble aggregate in the concrete..
    This is the way the big guys use in industry, I haven't seen acid etching in years unless its for exposed aggy.

  7. #157
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

    Default

    Thanks for all the replies.
    The acid is generally diluted 1 to 10 with water so if well washed off I can't imagine it would be too much of a problem. I not doing this till the shed is enclosed as dust is everywhere at the moment.

    Mark

  8. #158
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    I can't believe how the months have flown. A lot has happened since my last post.
    The drought ended with a serious flood and massive damage to fences and other infrastructure. Still fixing fences.
    Coronavirus hit which has had a significant impact on work. Some of you know I work in the medical field and work has been pretty busy last few months. Mostly planning around what might happen rather than dealing with large numbers of sick patients.
    Then my friend who is helping me build the shed had a minor stroke and has been away since.
    So have been chipping away on my own with slow but steady progress.

    In my last post I had just moved the crane into the shed to start working on it. Its not that heavy (?3 tonne)but awkward to set up and move. My plan was to set the crane up on the same railway line that it was going to sit on in the roof. So the railway line was set up the same distance apart that it was in the shed and laser leveled so it was on a flat level plane. Because the crane had been cut in half for transport the support from one end was cut off then replaced at the appropriate length on the remaining beam. This was time consuming,awkward and fiddly to get right. All the time trying to not have anything fall on me. Eventually got everything tack welded into place. I had planned to get a professional welder to weld the whole thing together but he pulled out due to travel/social distancing restrictions with coronavirus. So I welded some myself and got a retired welder friend to do some of the more difficult bits. Turned out pretty good in the end. Because I have no power for the welder at the shed I ran it off the 75kva generator I have there. No problems and did it easy. They recommend at least a 50kva generator to run the welder!!

    Time for some pictures.

    IMG_2090 (1).jpg

    IMG_2091 (1).jpg

    IMG_2092.jpg These 3 pictures are of the section that I had to cut the end off. It is upside down to make it easier. I was going to air arc gouge the welds away but a lot of them were pretty inaccessible so cut it up with a hand grinder. Slow and had to be very careful.

    IMG_2093.jpg

    IMG_2094.jpg

    IMG_2095.jpg Positioning the wheel support that had been removed for transport. Obviously needed to be straight and level. Then tacked into place.


    More next post.


    Cheers


    Mark

  9. #159
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    Time to continue with the pictures.

    IMG_2104.jpg

    IMG_2105.jpg

    IMG_2106.jpg At this stage preparing the end I had cut off to be transplanted on to the end of this beam.

    IMG_2136.jpg Leveling the railway line so all four crane wheels were on a flat plane.

    IMG_2138.jpg

    IMG_2139.jpg

    IMG_2142.jpg

    IMG_2144.jpg Having cut the crane beam to length ( this was definitely a measure twice cut once situation ) I then positioned the end back under the beam in preparation for welding.


    Continue next post.


    Mark

  10. #160
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    Continuing on.

    IMG_2169.jpg Yep its wet. This picture is from our front yard.


    IMG_2308.jpg

    IMG_2309.jpg Welding the outrigger wheel housings back on.

    IMG_2311.jpg

    IMG_2312.jpg

    IMG_2313.jpg

    IMG_2323.jpg

    IMG_2324.jpg

    IMG_2325.jpg My friend welded the crane to the end support and the supporting plates. I cut these from some 12mm plate.


    More to follow


    Mark

  11. #161
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    More photos

    IMG_2330.jpg

    IMG_2331.jpg With the crane welded up and painted it was time for all the other jobs. Cutting to length and rejoining the drive shaft for the wheels and a wire to hang the leads to the winch.

    At this stage I powered up the crane and sad to say nothing worked. Stress++
    The electronics on even a simple crane are complicated ( to me anyway ) . They have 415v circuits, 240v circuits and 32v circuits, lots of magnetic switches and transformers and the brake is driven off a 240v inverter. But after much testing with a voltage meter the offending issues were ironed out one by one till everything worked (thankfully).

    Mark

  12. #162
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    So now it was time to think about painting the shed floor before we started moving machines in. I had the crane booked for 25/5 to put the crane in the roof and move the big planer (16 tonne and too heavy for me to move) so had to get onto it. First had to move everything including the crane out of the shed.

    IMG_2332.jpg

    IMG_2333.jpg

    I'll talk about the floor next post

    Mark

  13. #163
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

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    Hi Mark,

    That is a whopping amount of work you have done ! Its starting to come together now.

    I'm glad the drought is over, but it looks like it got wet far too quickly for the ground to soak it up.
    Best Regards:
    Baron J.

  14. #164
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

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    Hi Mark, I'll bet you're glad that part is over?? Great to see that the drought is over for you, just hope that it soaks in and gives you plenty of feed.
    Looking forward to the next instalment.
    Kryn
    To grow old is mandatory, growing up is optional.

  15. #165
    Join Date
    Mar 2012
    Location
    Western NSW
    Posts
    543

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    I have been thinking about and talking to people about the floor for sometime. Eventually decided on a two pack epoxy coating in light grey.

    First had to clean the cement. After months of dust storms then serious rain, along with driving all over it, the floor was very dirty.

    So a sweep then vacuum, then pressure wash followed by an acid etch and then repeat pressure wash finally had the floor pretty clean.

    IMG_2335.jpg

    IMG_2336.jpg

    QMKY4089.JPG First coat yesterday, second coat today and 3rd coat tomorrow. Already looks good.


    Once that is done time to prepare for hoisting the crane into place and lifting the planer off the truck. Just need to make some 75mm lifting bars.
    Still need to get the crane rail trucks all trued up and running parallel .
    I think I can see the end in sight.

    Cheers

    Mark

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