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Old 03-10-2017, 07:16 PM   #1
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Default First sand casting

Today I poured my very first sandcasting .

Been casting alum for a couple of years now , mostly I simply fill all kinds of tin cans to cast rounds and squares wich can then be used on the lathe and mill .

So I decided to take it one step further , make a pattern and give it a go .
Turned out quite acceptable for a first try .
The part is half a carriage for a moving gantry cnc router I'm building .
The other half was also cast , but I don't have pictures .

Furnace , greensand , flasks and offcourse the pattern ..... it's all homemade .
Greensand was made from construction white sand , powdered bentonite and water . The bentonite was like flower , very fine and dry . I found it at a garden center .

The surplus of molten metal was poured in a couple of tincans .
I use a lot of these round "stock" for all kinds of things .


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Old 03-10-2017, 08:13 PM   #2
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Couple of more pictures of what it should look like when finished .

The two bores will get 4 lineair bearings wich will slide on two supported rails on a fully supported frame . More a design exercise then a practical machine .

These two "prototypes" were carved out out of a large block I cast in a square paintcan .
Took a lot of metal to remove , the entire shop was full of chips .
And when I finally got there , I goofed up with the two bores .
On both parts .

So start over again from scratch , hence the sand casting to avoid removing all that metal again .
Now let's see if I can getthose bores right this time .

The steppers are rotating nut types .
A fixed leadscrew has several advantages , and the steppers already have an integrated inti backlash nut .
Well worth giving it a try
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Old 03-10-2017, 10:09 PM   #3
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Nice work. Especially for a first casting.
Hallett cove
South australia
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