ian65
Part of things
Posts: 276
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So i bought this from the restoration show a couple of weeks ago..... wanted one for years and finally got around to getting one. I'm currently using crush glass blast media which is great on rusty parts but a bit severe for alloy..... it will probably calm down a bit once it's done a few cycles through the gun and broken down a bit but I want something a with a lighter touch to do my inlet manifolds.... Anyone else got a blast cabinet and what blast media do you use and for what? Any handy hints?
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Blast it!slater
@slater
Club Retro Rides Member 78
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Nov 18, 2017 17:48:14 GMT
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Aluminium oxide is far more resistant to breaking down than the crushed glass but gives a simlar finish. A fine grade might work for you.
You could try soda if the parts are already quite clean. Its ni good at removing paint or rust but will clean ally quite well.
Could also try glass beads.
Good thing is with a small cab you can change quite easily and see what works best for you.
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Nov 18, 2017 19:31:48 GMT
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We use plastic media at work for aluminium aircraft parts. Really does work well.
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1984 Rover SD1 Vanden Plas 2600 Auto 1985 Rover SD1 2300s Auto 2005 MG ZT 1.8 Manual
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Blast it!scimjim
@scimjim
Club Retro Rides Member 8
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I’ve just bought 25kg of fine grade aluminium oxide to try on alloys - I may be able to get to the workshop today to see how it goes
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Nov 19, 2017 10:45:42 GMT
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Glass beads instead of crushed glass.Make sure not to leave blind hole uncovered.
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Last Edit: Nov 19, 2017 10:47:34 GMT by slow2learn
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93fxdl
Posted a lot
Enter your message here...
Posts: 2,000
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Nov 19, 2017 15:01:41 GMT
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Media choice is only part of the process, grit size, media flow rate, air pressure and nozzle size, all affect the aggressiveness of your blasting and the surface finish obtained. Media selection is mainly down to the type of blasting you are doing, heavy work on rusty plate will require an aggressive media in a coarse grit size. Often walnut shell is a choice for engine/gearbox type work, it does not last too long but any media left behind will not cause damage. The balance of media flow against air pressure changes how aggressive the blasting is, more media and less air gives a softer blast, and vice versa, less media and more air gives a harsher clean. The nozzle diameter also affects the blasting, smaller nozzle gives a harsher more concentrated clean. Try not to use the same media for steel/iron as for alloys so you do not transfer iron oxides over and promote dissimilar metal corrosion. Ttfn Glenn
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Blast it!scimjim
@scimjim
Club Retro Rides Member 8
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Nov 19, 2017 18:14:32 GMT
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Last Edit: Nov 19, 2017 18:15:19 GMT by scimjim
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Nov 19, 2017 18:42:06 GMT
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It struggled to remove the paint on these wheels - I even tried a different set in case it had been powder coated by a PO - but it seems that the factory paint is tough as old boots! I took a couple of the Avon wheels that were standard on my Vauxhall for a mate to blast, he couldn't touch the centre paintwork either. I've seen them done, but not sure what media or hassle they were.
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Blast it!scimjim
@scimjim
Club Retro Rides Member 8
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Nov 19, 2017 20:21:03 GMT
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If I was only doing one set I’d probably start with a chemical strip?
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Nov 24, 2017 20:40:12 GMT
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I've not got a cabinet but I have a shot blaster and I use either crushed glass or I get some "play pit" sand from B&Q
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1992 240 Volvo T8 1955 Cadillac 1994 BMW E34 M5 (now sold ) 1999 BMW E36 sport touring x2 1967 Hillman imp Californian "rally spec" 1971 VW bay window (work in progress) 1999 Mazda 323F 1987 Jaguar XJ12 All current
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DON'T use sand. Yes it might work but I'd read up on silicosis before you use it next time. linkwas banned years ago as a commercial blast media becuse of the health risks.
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Take the Next slot right coming up on the left.
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Blast it!Deleted
@Deleted
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I take my steel wheel rime to a commercial blaster - last bill for 6 rims was £90 - sounds expensive but at £15 each I can find better uses of my time - my alloys go to an alloy wheel specialist where they tank dip them initially then blast them prior to repair again it's about better use of my time rather than waste a day trying to strip a set of wheels.
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Last Edit: Dec 5, 2017 8:51:47 GMT by Deleted
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stealthstylz
Club Retro Rides Member
Posts: 14,839
Club RR Member Number: 174
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Blast it!stealthstylz
@stealthstylz
Club Retro Rides Member 174
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The hot tank at work is great for loosening paint. Dishwasher might work the same.
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Blast it!Deleted
@Deleted
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Dec 27, 2017 17:02:40 GMT
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Dec 29, 2017 11:13:50 GMT
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Yeah adding an air bleed into the pickup line makes the gun shoot much smoother at lower pressures.
I've modified my cabinet a couple of times now to make the bottom a steeper slope down into a shoot with an external pickup for the media hose. That way there is always media over the pickup, so you don't have to stop and tap/brush it down the shallow sloped sides to the end of the pipe every 5 minutes or run a huge amount of media which gets blown around too much.
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