The ID of the tubing should be about .30/48, or 6 mil (do the same math
for the 50 caliber). This is VERY small. I have heard of surgical
stainless steel tubing with this small an ID, but not the normal brass
or aluminum at hobby shops.
On the other hand, you might consider sizing by OD and let ID fend for
itself. In this case you would probably use 1/16, the smallest you can
ordinarily buy (as in K&S). Use brass 'cause in that size the aluminum
is a bit fragile. The gun will be OVERSIZE in OD, but won't look too
bad. If you want to really scale it accurately, you'd need a hobby lathe
and start with brass rod, drill end 6 mil, turn OD to proper size.
Best 1/48 scale .50 cal. gun barrels
In my oppinion the Karaya barrels look the best, since they are a scale
diameter, and are perforated to match the actual jacket. They do not make a
.30 gun yet. Also note that the perforated barrels would not be seen on a
P-47, since they were covered by the steel jackets. But any bomber that had
.50 cals are an excellent option to use the karaya guns, they are also
available in just the barrels if you don't need the resin receivers.
King's Hobby here in Austin sells small cut sections of SS tube in at least
two sizes. The small envelope I have at hand is labeled Minimeca Ref 119,
Tubo 0.80 x 10, 20 unidades. Looks about right for .50 cal. Also you might
want to check out .50 cal. barrels and cooling jackets from Karaya, also at
Kings or found online.
At one of the shows last year I found some lengths (about 8 inches) of steel
tube at should work very well. Wish I could remember the vendor.
I buy needles from the local pharmisist 19 guage is about right for 50
cal in 1/48.I've just done some for my p47N ,basically I use a vernier
caliper or micrometer to measure the kit barrel diameter and measured
needles till i find one that came up to the same diameter.
To cut it I put it in a pin-vice and use a needle file to file a groove
around it ,and snap it off, put it back in the pinvice and square the
end off . I think I used 16guage in my Revell 1/32 P40, which I got from
my local vet ,they use bigger sizes on horses and cattle , than on humans .
"I'm not young enough to know everything."
You might want to look at this:
Small Parts has all sizes of stainless hypodermic tubing ranging in price from
about $2.50 for 6" to about $25.00 for 36"
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