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  1. #61
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    You will need a big petrol motor to drive air compressor heads compared to electric motors.
    Gold, the colour of choice for the discerning person.

  2. #62
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    RC i will need to look into that i thought it were electric hp to petrol hp but i noticed about half an hour ago on a web site a pump was rated for 4hp electric 7hp petrol

  3. #63
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    I think you may need to take a step back Gazza and work out exactly what you need in a compressor. Sandblasting is way overrated as a means to clean metal IMHO. To do any good at sandblasting you need big gear and lot's of expensive grit. Cleaning up a weld or small components in a sandblasting cabinet maybe (remember to keep your grit dry or it won't feed). I cannot see your neighbours tolerating too much free air sand blasting either. We then come back to air tools and spray painting. Both of these can be done off a 15 to 17 CFM single phase compressor and even your 10 CFM wouldn't do too bad of a job provided you are sensible. Have you got a 15A power outlet?
    The compressor you screen shotted earlier looks like a disaster in waiting and the pump doesn't look all that big either.
    A friend of mine just went down a similar track as where I see you could head. He wanted a bigger compressor than his little direct drive unit, so he looked on Gumtree and found one at the other end of the state powered by an 8 horse Honda. It belonged to a tyre fitter and was being sold due to an upgrade. When he showed me his new purchase, I nearly had a heart attack. Two of the three air cleaners were cable tied on, there was no unloader or auto idle valve and the wretched thing wouldn't reach more than 80 psi. A bit of investigation showed that it was an electric compressor that had been converted to petrol and then flogged until it died. The pump was unrepairable, so all in all, what he actually bought was an older Honda motor and a pile of scrap.
    Moral of the story, be realistic about your needs and only buy second hand what can be proven to work.
    I would avoid petrol power like the plague, it's great for the roadside, but electrickery wins every other time.

  4. #64
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    Hey Karl the sand blasting is not one car after another just little jobs here and there but i would like continous air flow rather than stop start every 30 seconds, i have had a little look into the bigger compressors new but they are out of my reach 15-17cfm are about $1000-$1300 for a cheap chinese model

    The reason i was going petrol were no electronics involved no 240volt wiring and totally deleting that hazard from the project where as the petrol engine was a bolt on and run

    I will look a little more for another electric compressor maybe i can get a few dollars from the one i have now to go towards a new one

    Budget is a big factor tho i do realise it does take a decent budget to buy a decent machine

  5. #65
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    Quote Originally Posted by gazza2009au View Post
    Hey Karl the sand blasting is not one car after another just little jobs here and there but i would like continous air flow rather than stop start every 30 seconds, i have had a little look into the bigger compressors new but they are out of my reach 15-17cfm are about $1000-$1300 for a cheap chinese model

    The reason i was going petrol were no electronics involved no 240volt wiring and totally deleting that hazard from the project where as the petrol engine was a bolt on and run

    I will look a little more for another electric compressor maybe i can get a few dollars from the one i have now to go towards a new one

    Budget is a big factor tho i do realise it does take a decent budget to buy a decent machine
    I really do understand where you are coming from. My first compressor was a converted refrigeration compressor powered by a 3.5HP Clinton petrol engine off a Howard Bullfinch rotary hoe.
    I've done a bit of blasting and that's why I'm trying to steer you away from it in favour of other methods. Blasting eats garnet at the rate of knots, particularly if you cannot recover it to reuse. There are many options that are more friendly to home use such as wire brushes, strip it discs or even chemical methods. Around the time that my mate bought the dunger compressor, there was a second hand scorpion brand compressor that came up on Gumtree for $780. The Scorpion looked really neat, was petrol powered and had all the auto idle and unloader gear that a compressor is meant to have. My mate was already $500 into his disaster at that point.
    I've got one 40CFM three phase compressor and a 100 CFM 3 phase screw compressor if I ever pull my finger out and sort out the electrics to run it. I don't blast anymore as it became too expensive and messy. My second compressor was a 15CFM Ingersoll Rand which I still have. That compressor has run die grinders, 1/2 and 3/4 inch rattle guns, sprayed paint, run air chisels and scalers, blown down, blasted and even arcair gouged. The only times it was seriously wanting was when blasting larger items and arcair gouging.
    I would rather see you get into a decent 15CFM compressor, than a 40 CFM frankencompressor.

  6. #66
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    I am looking now googling seem's a lot of the FAD rated compressors on single phase are stopping around that 300-320lpm mark or 11cfm these are $1000-$1200 machines i see the IR starts at $1500 i dont have that kind of cash but could possibly use afterpay

    When my compressor is printed 10.8cfm but really puts out 6.5cfm how do i tell the difference when looking for a new machine? I had to calculate my min/max psi and use the time in my video on you tube to work out my machine is 6.5cfm i cant exactly do that over the internet would really dislike to lay down 1000 big ones get the compressor home and do the calculation to find out its no bigger than my pilot air

    Some online shops are kind of deciving with cfm and free air delivery

  7. #67
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    I am now actually looking at this machine its australian made https://www.tradetools.com/product-r...lpm-compressor

    Kind of a mamoth machine i do have a 15 amp outlet to run it but $1000 price tag will take some careful planning

    Another option will be this one slightly cheaper but i do like the grand daddy above
    https://www.tradetools.com/product-r...lpm-compressor

  8. #68
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    I just signed up for zip pay and was approved for a spending limit of $1000 @ $40 a month repayment that sure is better than repaying $250 a fortnight with afterpay

    now the shopping begins which compressor do i chose? the two below fit the budget, they are a local shop to me i have purchased from before but a $1000 compressor i want to make sure i buy once and once only...

    the Ingersol Rand is out of the budget by $500

    here are two can u guys please tell me what u think if they are ok or if they look "toy'ish"

    https://sydneytools.com.au/product/f...air-compressor

    https://sydneytools.com.au/product/f...air-compressor

    the one from Trade Tools in my last post will likely have a steep delivery charge, These Sydney Tools compressors are delivery free and a little cheaper but i fear they are just average chinese quality

  9. #69
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    Of the machines that you mentioned, this one gets my vote. https://metalworkforums.com/redirect...lpm-compressor The two year warranty is double what sydney tools is offering and I would pick it over the "big daddy" as for the loss of 20L tank capacity, you gain portability. Remember, the tank does not increase your compressor's performance one iota.
    Just be aware of a couple of things. Firstly, those compressors are not really up to sandblasting if that is still your intention (I hope I've talked you out of that) and secondly, while they may be assembled in Australia, the components will likely be of Chinese origin, except for the German pressure switch. The Chinese can and do make some good products, just don't think you are getting a premium product because of smart wording. Pilot Air offer 2 similar machines, their base model priced at $1280 and their Super Duty version at $1700. Same performance, but both will outlast the renegade offering given equal maintenance. If I used them in a business, the super duty Pilot Air would be a no brainer, but for your usage, the Renegade should be reasonable. I would trust the free air ratings more for the Pilot Air, but I wouldn't stake my life on any of the cheapies telling the whole truth.
    I still don't know if you really need to upsize though. 6.5CFM FAD should be adequate to run a rattle gun, die grinder or similar provided you regulate your air to 90 PSI which you should do anyway. Yes, the compressor will run a fair bit, but how long do you actually grind for and how often? You can spend a lot and gain little.

  10. #70
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    Hey Karl i checked out the payment options on the trade tools they are looking into accepting zip pay and after pay but dont accept it yet bugger

    My compressor seems quiet tiny 6.5cfm i only used it for maybe 20mins with the die grinder but it really did work hard in that time i guess i wont be flogging the air compressor on a weekly basis but it will get a work out for a day here and there that may he 3 days strait than left for months untill another session, after i used the die grinder i just wanted to go big the stopping and waiting for the machine to build up was a bit of a downer as when im in the mood and motivated i just want to do the job and finish for the day

    There really isnt that much of a gain for my money i have looked every where all over google the best i could find was i think 11.5cfm for under $1000 that is a good amount of cash for basically 20 seconds extra on the air duster per minute it doesnt sound worth of purchasing but i very rarely get finance so thought i would upgrade the compressor

    I have ran a northen tools taiwan made stubby 400fb rattle gun and this compressor done that effortlessly i think it recharged once while i was doing a car drive shaft and the bike engines i have worked on were very easy on the air demand

    I guess in saying that and thinking about it 6.5cfm does do a lot that i want but i have n9t punished it yet with a whole boat respray that i think may be the down fall

    On another note that little 30L compressor i picked up wont go to waste i have found a new 3/4th hp pump to go on it picking it up friday and will put a g100 honda clone on it 2.5hp petrol engine it will be a loan out to mates compressor easy to carry and put in the car boot my cousin does a bit of repairs for friends of the family so im sure he'll love to use it with the rattle gun

    This is the only worthy compressor i ended up finding who does zip pay its a 70L 18cfm displacement, 11.5cfm FAD the pump is designed for continous run but i dont know how much shipping is

    https://www.bluedm.com.au/piston-air...m-70l-125-psi/

  11. #71
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    Provided you are sensible with your choice of spray gun, the Pilot Air that you already have should do the job fine.

  12. #72
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    Quote Originally Posted by gazza2009au View Post
    My compressor seems quiet tiny 6.5cfm i only used it for maybe 20mins with the die grinder but it really did work hard in that time i guess i wont be flogging the air compressor on a weekly basis but it will get a work out for a day here and there that may he 3 days strait than left for months untill another session, after i used the die grinder i just wanted to go big the stopping and waiting for the machine to build up was a bit of a downer as when im in the mood and motivated i just want to do the job and finish for the day
    For the brief time I used an air die grinder, before I rusted it to death, I found it absolutely chewed through the air. Eventually I worked out if I wound the regulator in to about 70 to 80psi, the tool was a bit slower, but still effective, and went a lot longer before the motor kicked in.

  13. #73
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    I ducked into the tool shop today for a peak at the compressors i was surprised at the quality of the Lincoln air compressors they looked high end but maybe they were just painted to look really nice and flash, The 150L Fendi was massive i mean it was huge compared to the Lincoln 60L

    the whole unit on the Fendi 150L was just massive the pump was at lease 2 times larger than the Lincoln 50L models which both ran a single cylinder head, The Lincoln 60L actually runs a 3 cylinder pump but is my full budget

    the Fendi 150L is $799 puts out Air Delivery Displacement: 12cfm, Pump Displacement: 15cfm

    the Lincoln 60L is $999 Air Delivery Displacement: 11.3CFM, Pump Displacement: 16CFM

    really worried the Lincoln's small size it would definatly be something someone could easily steal from my shed where as the Fendi is a mamoth of a machine

    took a pic of the Fendi had to step back 2 meters to take the pic the fendi "looks" like a cheaper paint job but its $200 cheaper too i may go with this air compressor the Lincoln 50L and
    60L models look like a single man can pick them up and toss it over my 4 foot gate easily

    i noticed the Fendi had what looked like 3/8" tank fittings thru the on/off switch but i recall one of the models having a 1" fitting at the top rear of the tank that could possibly be connected to a 1/2" direct fitting for maximum output

    i need to make the decision 150L refills in 55sec, or 60L unsure on how long it takes to refill, I'm assuming the 60L tank will be kicking in and out quiet a lot with the die grinder? i plan on using which ever compressor i got with with my die grinder to cut some long slots in a piece of aluminium for the small 30L compressors motor and pump slide mount
    Attached Images Attached Images

  14. #74
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    Quote Originally Posted by gazza2009au View Post
    i plan on using which ever compressor i got with with my die grinder to cut some long slots in a piece of aluminium for the small 30L compressors motor and pump slide mount
    Gazza, that's definitely not what a die grinder is designed for. So many better ways to do that job. Drill two holes and cut between them with an angle grinder and 1mm disk.
    Die grinders are for fine work, not hogging out bulk stock.
    You could buy a plasma cutter instead of a new compressor and cut out the slots that way, then be left with a plasma cutter at the end for other jobs.
    Rusty Arc is dead right, a regulator is a must and lowering the pressure/ speed is a good cheat to find the sweet spot. Many die grinders have a speed regulating screw as well.
    When it comes to compressors, nothing is free and all the budget models are built from Chinese components coupled with a flashy paint job and bright stickers to entice the buyer.

  15. #75
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    I bought a "cheap" compressor head.

    The head gaskets are like aluminium foil, the valves are just flappy bits of tin. It was a triple head, I think only two cylinders do any pumping now and even then they are pathetic.

    The head was to replace a Swan brand one from the 1980's. It lasted decades, the cheap chinese head a few years.
    Gold, the colour of choice for the discerning person.

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