#1
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Bead-blasting
Anyone had any experience bead-blasting gear cogs? Would bead-blasting damage the hardening on the teeth? Ours are a bit rusty, and a rotating wire-brush doesn't properly access all the nooks and crannies.
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#2
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Bead blasting
Hi Andrew,
You could try Soda blasting which is much gentler. Another alternative is to use Molasis which you can get in bulk from the produce store. You then mix with water - I use 1 part molasis and 2 parts water. Leave the item to sit in the mix for about a week. Parts will be back to bare metal and you can just rinse under water. The solution will turn some sufaces a blackish colour - but they will be free of the rust. Hope this is of help. Regards,
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Brett Nicholls |
#3
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I do not believe bead blasting would do any harm what so ever to your gears. You are talking glass beads, I assume. The stuff is however, harmful to your lungs, if you don't take the pecautions required. It is also very important that your clean up of your parts (to have them 110% clear of any glass residue) is vitally important.
Glass bead blasting can make a component more durable because it tends to eliminate stress points from which fractures start.
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Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions.... |
#4
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Bead blasting absolutely. A friend of mine rebuilds truck transmissions and uses this on gears, especially if they are hard to find or obsolete.
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1981 MANAC 3/4T CDN trailer 1943 Converto Airborne Trailer 1983 M1009 CUCV RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers |
#5
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Thanks for that. Re molasses, I am a convert and have had great results with it. I have already used it on the gear cogs and now I want to get rid of the black residue and also some persistent hard-caked grease that is reluctant to dissolve in solvent.
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#6
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I use molasses quite a lot and this is the result, lovely shiny clean bits.
I use a mixture of 10 to 1 molasses to water, that is diluted enough. I wire brush each item after rinsing it off and then it is ready for priming after a wipe over with a wax and grease remover. Lynx manual carrier before immersion. The finished item ready for painting after repairing it. DO not put any die-cast items into the solution or you will end up with that a bit of mush. Any oil or grease will stop the process at that particular point, but will continue to work on the rest of the item. Regards Rick
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1916 Albion A10 1942 White Scoutcar 1940 Chev Staff Car 1940 F30S Cab11 1940 Chev WA LRDG "Te Hai" 1941 F60L Cab12 1943 Ford Lynx 1942 Bren Gun Carrier VR no.2250 Humber FV1601A Saracen Mk1(?) 25pdr. 1940 Weir No.266 25pdr. Australian Short No.185 (?) KVE Member. |
#7
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So Rick, for the molassess bath, a thorough degrease is in order prior to immersion into the bath for best results?
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1981 MANAC 3/4T CDN trailer 1943 Converto Airborne Trailer 1983 M1009 CUCV RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers |
#8
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If you remove any grease beforehand the molasses will work better. At least that has been my experience. I use a 6:1 ratio of water to molasses and if left for about 10 days it gives the excellent results achieved by Lynx42 above. A high pressure water-blaster (mine is 2000psi) is best for cleaning the black gunk off afterwards. However with my gearbox cogs there is still an unacceptable amount of residue that I now need to remove by some other method.
It is surprising how, sometimes the de-rusted steel does not start rusting again immediately after the molasses treatment, while other times it gets an orange "rust bloom" almost straight away. I suppose it might depend on the humidity of the air. I sometimes use a blow-torch afterwards to speed up the drying process and avoid further rusting. Its amazing to me that the molasses method is not more popular, as it does an excellent job, is very cheap, easy, biodegradable, non-toxic and (if you are in a rural setting) easy to dispose of afterwards. As far as I can see there is no down-side to molasses, as long as you plan ahead and are not in a hurry. |
#9
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Quote:
Regards Rick.
__________________
1916 Albion A10 1942 White Scoutcar 1940 Chev Staff Car 1940 F30S Cab11 1940 Chev WA LRDG "Te Hai" 1941 F60L Cab12 1943 Ford Lynx 1942 Bren Gun Carrier VR no.2250 Humber FV1601A Saracen Mk1(?) 25pdr. 1940 Weir No.266 25pdr. Australian Short No.185 (?) KVE Member. Last edited by lynx42; 09-10-15 at 10:10. |
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