Protar AJS 7R 350cc (1/9)

[Heavens Eagle]

@Sharkmouth @paddy
I made a small bead blast booth to use my Paasche Air Eraser on R0L3X Yacht Master Bezels when I refinish them. There are several types of media. I found that the abrasive media I had gave a frosted effect on the metal and then any oil touch would make it darken in weird patches. I then got some glass beads which gave a slightly softer effect as it wasn't abrasive but peened the surface. It also didn't do the darkening bit with oily finger touches. Only problem was I had to buy an 8 pound package of 220/240 grit glass beads which for the air eraser is enough to last decades. I did find a nice heavy plastic box to make into a booth for it that works perfectly.

If I ever needed a larger box, there is a MUCH larger box like this that would work well too.
The 3 inch holes I drilled are "just" big enough for me to pass my hands through. The white fabric is a satin piece I got at Hobby Lobby and placed some fishing weights on the bottom edge to hold it down and make it drape. Next time I will just make some sleeves around the holes to put my hands through. As to the grit coming out. There is so little actual air movement that it just drops to the bottom and sets there. No air pressure, no dust.

 

[paddy]

What sort of air volume do you need Paul for the Paasche ?

 

[paddy]

An often found problem with old kits and poorly packed kits

This is a 1mm rod and unfortunately the levers each end are also 1mm wide so cant be drilled.

The answer is to drill the levers 0.35 and insert a hard steel pin and cut a piece of 1mm alloy tube the same length of the original rod

Drop of CA each end.....Job done

 

[Sharkmouth]

@Heavens Eagle, I thought I had seen you use one! This is why I laughed when you chimed in! Too bad the name is Paul and not Tim!

Wait, am I Wilson?

 

[Heavens Eagle]

@Sharkmouth You are done now Wilson Garcia!

 

[paddy]

AJS 7R engines were often gold, but some were black. Basically, they were painted to protect the magnesium castings which would corrode very quickly if left open to the air. Its very much like the zinc chromate the US used on their interior alloy panels on Aircraft during he war . It also helped seal the casting that tended to be porous. Magnesium casting are about 35% lighter than alloy so has a great weight saving on engines

 

[moon puppy]

Looks sharp Paddy. I thought Magnesium had a slow corrosion rate, I remember someone talking about that on the German tank tracks.

 

[paddy]

Magnesium corrodes while you look at it. Its banned in the states for things like wheels. It has a shelf life of about 10 years but is structurally compromised by 5 years. Ducati owners used to ring me up and ask about there wheels but i always recommended throwing them away and switching to alloy as the first sign that they were on the way out was cracks which on a bike would mean they would shatter

 

[Steve Ski]

Fine motor works, Paddy!