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Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Parts 07 - Motion gear Hi, In recent postings I mentioned that I was trying to find a way of getting the rods to look acceptable without paint. I have tried Wet n Dry 1500 grade paper and whilst the finish is nice it is difficult to cover the surface 100% because of the indents. I also suggested light bead blasting may also provide a acceptable finish. See below the result of bead blasting at 50psi. I still need to apply clear etch primer and probably matt lacquer. I suspect this is the route I will now take for all the motion gear. regards Dennis Dennis attached the following image(s):
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Look great
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Tomick, Yes, pleased with overall effect. I may add a touch of black to lacquer coat. I ordered and received clear metal primer off MDC, excellent service. Tamiya clear metal primer did not appear to be stocked in UK and postal charges from overseas Were ouch! Rgds Dennis
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Parts 07 Motion Gear Following my previous posting I have now bead blasted all the motion gear.This included the cross heads and the motion bars. Removing the bars was a little messy due to available space when removing the screws. All parts were degreased after blasting and then airbrushed with clear metal primer as previously mentioned. Finally all the parts were airbrushed with matt lacquer. I did add a very small amount of gloss black which has dulled the 'brightness' that was evident after blasting. I must say holding the smaller items was difficult when bead blasting but the results are worthwhile. Finished rods shown below. regards Dennis Dennis attached the following image(s):
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Dennis, Looks great, really authentic finish and the hint of black makes a difference. Could you tell me a little more about the bead blasting as this is something new to me. Cheers Peter
Current builds: Amati 1:200 Hood; D51 200 Bought and on the waiting list: HMS Endeavour's Longboat, 1:90 San Juan Nepomuceno, Titanic Lifeboat,1:200 Bismarck Strip and Rebuild [b]Built:1:250 Titanic
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Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Peter, Blasting of metals is a common way of preparing the surface of metals. When it comes to removing paint or rust then abrasive grits are used and high air pressures. Softer metals would suffer badly if blasted with these. Blasting may be carried out on an industrial scale as open plan. However as we need to blast smaller items then cabinets are used whereby the medium is recycled to and from a type of spray gun. Gentle blasting is used as a way of cleaning up metals such as alloy castings etc. As we need a more gentle action then various 'grit's are available from soda ash to glass beads and many others. Grits that seem harmless normally when 'blasted' onto the item have an abrasive effect. My main hobby is restoring old motorcycles and as such I have a small home built cabinet (see below). This has a glass window to enable the process to be viewed. A hinged/sealed door for access and a pair of sealed in long rubber gloves that enable the user to hold items with one hand and the blast gun with the other. The base of the cabinet is angled downwards to encourage gravity to keep draining the used beads back to the gun via pipework and the air flow which as well as propelling the grit also provides a venturi action. The air pressure can be varied, lower settings being less abrasive. I am now happy with the results. Always check threaded components for residual grit otherwise it may play havoc when inserting screws. I Hope that helps. I am sure searching online for bead blasting will also provide some guidence. regards Dennis Dennis attached the following image(s):
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Certainly acheiving a rearly nice effect and a texture similar to the wheels. J “Whenever you find yourself on the side of the majority, it is time to pause and reflect.” -Mark Twain
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Hi Jade,
Thank you. I am pleased with the effect.
Regards
Dennis
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Hi Dennis I do like this effect and will probably go for it myself as I was never happy with the Alclad finish I got. Im sure I have seen somewhere I mini shot blaster il have to have a delve regards Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Andy,
After reading and seeing your own results I did buy some Alclad, steel paint but I just wasn't happy with the result. I am used to the effect that bead blasting can produce. Except for looking light, which has been reversed it's worked well.If you need any help re bead blast in then let me know. Thank you for your comments.
Regards
Dennis
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Hi Dennis I knew I had seen something whilst delving the internet ,what do you think of these 2 I know that a collector type box will be needed to contain the dust but I think my mini spray booth will cover this. Link below http://www.everythingair...talog/Sandblasting.html
regards Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Hi Andy,
If anything those two airbrush style units may be more appropriate. My own is somewhat unwieldy On such small items. The actual grit used and the pressure will produce varying results. Use a fine abrasive like glass beads. I know suppliers can be found even on eBay. Don,t underestimate containing the grit from the spray. You could simply use the gun outside and run total loss but that would be expensive.
Regards
Dennis
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Hi Dennis I thought these items may be more in line with peoples pockets aswell as for the grit from past experience its like sand on the beach gets every bloody where .It says best run at 50PSI but like you say some experimenting will be needed but I think il go with one of these myself regards Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Andy,
Always worth being self sufficient. It will be a useful tool. Be careful I have used sand on a rusty motorcycle frame and it was fine. However the result depends upon metal being blasted, type of grit, air pressure and flow. On those alloy parts it may be too abrasive although the small gun will help.
Let me know how you get on?
Regards
Dennis
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Hi Dennis Just ordered one off fleabay at £29.99 plus free postage and says it will arrive Monday, I will show the results shortly regards Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Andy,
Not a big investment. One thing is the nozzle through which the abrasive passes does wear. I use ceramic nozzles and they still wear. Although limited use like small parts should mean slow wear depending upon nozzle material.
Regards
Dennis
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ceramic nozzles are certainly the best option if you are going to use it regularly. I have never used this process in my model building, but I have purchased spares for equipment in a number of paint shops and the plastic nozzles get shot through very quickly in comparison. not sure if they are available for your kit Andy. As a general rule the best ceramic nozzles come from the US from my experience. “Whenever you find yourself on the side of the majority, it is time to pause and reflect.” -Mark Twain
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Hi Jase The nozzle seams to be of metal construction looking at the enlarged pic on the one i have bought regards Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Pro Groups: Registered
Joined: 08/08/2013 Posts: 184 Points: 567 Location: Runcorn
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Hi Andy,
The main thing will be that nozzles are available as spares. In use you can determine how fast they wear. Even the hardest of metals even ceramic still wears However the wear rate may not be an issue short term. Wear is to be expected since the abrasive passes through the nozzle. Worn nozzles result in reduced air flow and therefore inferior blasting.
Regards
Dennis
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