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The Knimbies who say No

Media blasting for the amateur

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Would like to be able to effectively strip and respray objects up to the size of an adult bike frame, on an occasional/hobby basis ie not a commercial or large scale setup.

 

I'm not sure if some sort of blasting setup would be advisable, however the torrid time I had trying to get paint from a frame using chemical stripper a couple of years back means I am looking at the options for media blasting. I understand that chemical strippers for domestic use have been made much less effective in recent years. I used a well known brand in a green tin and, like many, found it to be pretty hard going.

I have a compressor, delivers about 4cfm at 10 bar and am now looking at options to get a small, inexpensive setup for doing some blasting and painting. Options for blasting, as far as I can see, are one of those pressurised canister type blasters, with a homemade enclosure to contain and the media, or a bought cabinet which would likely be much smaller with the media recycling handled within it. I obviously don't want to create lots of free dust.

I guess painting will be doable with a homemade enclosure and decent facemask. I might have an old wardrobe about to be taken out of service which might be useful for one of the tasks.

 

It might just be a big faff however, so the alternative is to use a professional outfit instead. It would be nice to have a go myself though.

 

Merrry Crimbo.

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I'm pretty sure you'll need a much bigger compressor and a 3 phase power supply for it. I've got a small 3Hp compressor and have played around with a blasting kit. It was a waste of time and barely tickled the surface. Probably better to take it to a specialist and have it done.

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You are best off paying professionals for all your metal blasting needs!

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You will realy need a compressor that will produce 10 cfm + @4bar ish unless you are willing to do a bit at a time 

Machine mart do cheap but effective gravity feed guns/kits  i use this one      but have used this for small jobs but its a pain refilling it  but it would be better suited to your compressor output ......in your position i would spend the money on a bigger compressor  rather than a cabinet 

Forget buying media (unless it`s real heavy rust you want to remove) just buy a bag of kiln dried sand from Jewsons  about a fiver for a 25kg bag it leaves an excellent key for the new paint and it has uniform grain size 

Recycling media is not a good idea especially if you don`t know if the paint you have removed is lead based 

 

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I thought this was going to be about writing strongly worded letters of complaint to OFCOM.

It's not too tricky to build a cabinet as good as any commercially produced one.

I've got all the kit but rarely use it. For small parts I tend to use a wire wheel, in a bench grinder, or a die grinder. For larger stuff I'm fortunate enough to, within reason, get it done by a waste compaction machinery manufacturer for free in return for my continued waste machine business - it's one of those companies that manufactures the compactors that sit outside attached to large skips so they get quite rusty so they shot blast and reprint when refurbed. They also shot blast all the steel first when they fabricate them new.

They have a huge machine, where you basically feed stuff in, on a conveyor, and it comes out pristine the other end - they've put a car chassis through for me before - or a guy uses handheld kit for thinner gauge stuff that might warp.

 

 

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5 minutes ago, SpectrumFX said:

Just rub it down with a bit of wet and dry, and slap a new coat of paint on 

Job done :)

 

There's various abrasive flap wheel, and discs, that work well. Poly abrasive discs, for angle grinders, are really good for not removing any metal but relatively expensive. Those emery cloth discs cut into stringy slit bits are really good for the nooks and crannies.

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19 minutes ago, SNACR said:

There's various abrasive flap wheel, and discs, that work well. Poly abrasive discs, for angle grinders, are really good for not removing any metal but relatively expensive. Those emery cloth discs cut into stringy slit bits are really good for the nooks and crannies.

Fnnnnaaarrrr fnnaaaaarrrrrr...!!!

That's the filthiest collection of double-entendres that I've heard this side of "Carry On Up The Khyber"...!

Well done sir..!

;)

 

XYY

                                                                                                               

The dog's kennel is not the place to keep a sausage - Danish proverb

 

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I used to have access to a proper industrial grit blaster.  It was hard work, but pretty quick.  I tried to replicate this using my fairly decent compressor at home.  It was useless in comparison.

These days I use an abrasive disc like this one http://www.toolstation.com/shop/p18114 to do the bulk of the work then finish off details with grit if I can be bothered.

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Thanks for the views, I had to go out sooner than expected so apologies for abandoning the thread. Yeah, good to hear about other options instead- the poly abrasive or wire wheel/disc route allied to a better angle or bench grinder seem like the way to go. My current angle grinder is an entry level model with no speed control.  Some bike frame tubes can be very thin in places so I am wary of damaging them.

 

Time to get blasted. Merry Xmas!

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I thought this would be a thread about sound bars or something.

Some useful information though.

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3 hours ago, dgul said:

I used to have access to a proper industrial grit blaster.  It was hard work, but pretty quick.  I tried to replicate this using my fairly decent compressor at home.  It was useless in comparison.

These days I use an abrasive disc like this one http://www.toolstation.com/shop/p18114 to do the bulk of the work then finish off details with grit if I can be bothered.

The guy I used to have come and do really big jobs, on heavily corroded stuff, is pretty much totally handicapped now with white finger.

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