[WWI] Added Halberstadt DII

Paul Butler pgbrol6b at tpg.com.au
Sun Jul 17 03:49:08 EDT 2005


Great model -- very impressive -- probably too 
small for me to manage. I will stick to hand 
filing hex flats on scale size nuts and bolt heads and simliar do-hickies.

I am curious about the material you have used to 
construct the U/C assemble jig. Is it plastic foam board?

I got a clue about a suitable material (for a 
soldering suport surface) from a product that 
Micro-Mark sells for use when soldering small 
parts, namely ceramic fibre board, They call it a 
Soldering Pad (product numbers 70219, 80751 & 
70220). I rang around the local furnace 
manufacturers and was able to get a piece (13" x 
18" x 1/2") for $15. It came out of their scrap 
bin so the price is probably a number they plucked out of the air.

I made up a wooden (MDF) box to hold the fibre 
board (it is very friable) and have used the 
board to support parts (with pins) while silver 
soldering. The surface of the board glows red hot 
but 1/2" thickness is plenty to protect the wood from the 2000°F+ gas flame

On the matter of soldering, I have tried out some 
'Solder-it' silver bearing low temperature solder 
(melts at 430°F), (also from Micro-Mark). Very 
easy to use. Significantly less trouble than 
soldering with lead-tin solder. Readily wets 
steel and I expect brass. Doesn't adhere to 
aluminum so you can make your jigs out of 
aluminum. (You can also get a similiar solder for 
aluminum directly from the manufacturer.)

Claimed strength of Solder-It is 10,000 to 25,000 
psi (ordinary lead-tin is around 5000 psi)

Another interesting prospect is that you can 
'oven' solder as is done in the manufacture of 
aluminum auto radiators, ie. pre-assemple your 
parts in a jig, apply the solder paste then put 
it all into an oven, (don't use an oven that is 
still in use for cooking food because the solder 
flux fumes and spatters quite a bit)

I realise that much of the above may already be 
known to many if not all list members and it may 
also be academic to most non-flying model builders.
However, builders of flying model (especially 
small electrics) may find Solder-It extremely 
useful because its higher strength equates to 
smaller (lighter?) joints and the low melting 
temperature will not affect the spring temper of 
cold drawn wire (ie. music or piano wire).

Regards to all

Paul Butler
pgbrol6b at tpg.com.au
Tel: +61 3 9457 2877
Fax: +61 3 9457 2877

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