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eBay sand blasters

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troppo
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Re: eBay sand blasters 2016/03/18 09:28:56 (permalink)
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Wiggy333
Basically though up the top you have a ball valve at the air inlet and one further down feeding pressure to the sand falling out the bottom. I found though that too much pressure went to the top of the tank and blocked the sand so I added another ball valve between the water tap and pipe going to the top of the tank so I can vary that pressure if it blocks ( when it stops I turn the pressure down at the top and it clears it out). At the bottom the ball valve was just to small and blocked there to much so I think it was a 1/2 inch ball valve originally and I fitted a 3/4 ball valve with adapters which made a hell of a difference. Also the more expensive ones have a proper blasting handle which I think sucks. The cheaper ones which the picture shows is a ball valve tap with the ceramic attached (and my lance is just an extension to lengthen it) it works much better and you can vary pressure by how little or how much you open it but the best thing with the cheap ball valve one is if you do get a rock or stone that blocks at the ceramic tip you can turn the ball valve off unscrew the tip remove it and go again. The expensive handle one seals itself with metal and rubber it's awkward and doesn't seal correctly after five minutes of use also if it blocks as there is no way to turn the pressure off you have to depressurise the hole system to unscrew the tip and clean it out. Hope I made some sense but will post more pics when I can and maybe a YouTube video to show. Keith



 
Makes sense, how did you thread the lance pipe? Good thinking on the ball valve enlargement, sounds like the obvious thing to do when you put it the way you have. Looking forward to a vid if you post it. I have three bags of bunnings play sand that I`ve dried and filled the blaster with (the rest  is in a sealed container, i only put about one bag in the blaster). Going to have a need for it soon, just got to do some rust first (yes i know wrong way round, but i cut out a good area around the rust)
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Wiggy333
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Re: eBay sand blasters 2016/03/18 16:52:16 (permalink)
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I would think the playsand might be a bit fine. What state do you live in as Bunnings sell different sand in different states. I use the Builders dried sand which is in brown paper bags ( like cement bags which is coarse but to coarse) thing is if it's to fine it takes longer ( but is gentle) although it may turn to powder quicker which gives more dust and may only be able to be used once. Also the play sand is not always dry which is a pain to dry out unless you prepare it. I would recommend a trial but swap if you can.
For the lance I brazed the fittings on with the oxy so it took five minutes to build. And used the 19mm larger copper pipe not the 12mm smaller stuff ( didn't want it to bend and hit me in the head). Keith
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Wiggy333
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Re: eBay sand blasters 2016/03/18 17:23:15 (permalink)
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Here are two pics one of the ball valve and start of lance, and the ceramic fitting at the end of the lance. I also get new tips from my engineering shop as they wear out after say 8hrs of use. I get them from AIS at Buttsworth in Windsor Sydney. 

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troppo
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Re: eBay sand blasters 2016/03/18 18:35:09 (permalink)
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Great stuff mate, no problems with the sand being damp, i`m in SA and i had the sand spread on a tarp for a couple of hours mixing it about 20 minutes or so during the height of summer. So 40 + degrees in the shade dried the sand out fine, i`ve got it stored in a sealed plastic drum so it wont absorb any moisture. Love the lance, great thinking and the ball valve at end of the lance is a ripper of an idea that i am going to pinch. Actually i think i`ll pinch the whole setup lol
Cheers
Troppo
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Wiggy333
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Re: eBay sand blasters 2016/03/18 18:50:33 (permalink)
+1 (1)
No patent from me just like to share my experience and knowledge. And from memory you guys don't get the dried sand I'm talking about. The play sand is always in the garden section not in the trade section like we get. I just remember it was really fine sand which for what I do in bricklaying was beautiful but for sand blasting mmm. You should try a local landscaper I remember filling bags of 40kg of sand there for five dollars. Probably better than the play sand but heaps cheaper.
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troppo
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Re: eBay sand blasters 2016/03/19 12:44:17 (permalink)
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Will have to look into it, i`ll check out landscaping supplies and bunnies next time i am going past. I`ve got a layer of enamel to get off the bonnet and grill of the van. Will have to try to make tent sort of setup so i can catch the sand for re-use. I`ve got a 1.5 mtr length of 19 mm copper pipe i bought to make a weld backer, so once i cut that off i should have about 1200mm left, perfect for the lance. Got to wait to get the fittings, i`m broke right now lol
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Wiggy333
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Re: eBay sand blasters 2016/03/19 12:53:17 (permalink)
+1 (1)
I just use cheap tarps or even builders plastic. Don't seal yourself in to much as you need lots of fresh air and the sand falls straight to the ground if you can reuse it and what doesn't and floats away you can't reuse anyway. Remember sand is dangerous to breathe so dust mask is necessary equipment.
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troppo
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Re: eBay sand blasters 2016/03/19 14:17:37 (permalink)
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Wiggy333
I just use cheap tarps or even builders plastic. Don't seal yourself in to much as you need lots of fresh air and the sand falls straight to the ground if you can reuse it and what doesn't and floats away you can't reuse anyway. Remember sand is dangerous to breathe so dust mask is necessary equipment.

Yeah, got the respirator i use, safety glasses and a face shield. I`m just wondering if i can strip the enamel paint off without having to go down to bare metal, the last owner had a dodgy paint job over the factory paint. I`m painting it with acrylic so need to remove all traces of the enamel. this will be perfect for those tight places that you cant get a sander to.
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