Solid aluminum pistol casting from recycled scrap aluminum.

This is the 1st part of how to cast a solid aluminum pistol using a homemade furnace and recycled scrap aluminum.

This is the 2nd part of how to cast a solid aluminum pistol using a homemade furnace and recycled scrap aluminum.

Aluminum boat cleat casting using a homemade furnace + tutorial of this project.

Hi everyone, so this is my first post for 2015, in my last post I made a tutorial of how to prepare a sand mould using a solid pattern. In this post I will explain how I made a solid aluminum boat cleat using a split pattern with my homemade furnace.
I have also created  another tutorial this time explaining how to create the split pattern for this type of aluminum casting.

This special request came from my brother that is taking a course in becoming a yacht skipper.

He doesn't have a Yacht yet.... but a boat cleat is a good start ;-)
So first I have made a quick sketch design using Google Sketchup.

After I had some idea and plan as to how I want the pattern to look like I started making it using MDF as the main material for the pattern. The split pattern is constructed from 2 half's of 18mm MDF. 

The pattern size is 100mm height, 300mm width & 36mm in depth.  I started by making a template of the boat cleat transferring it to a sheet of 8mm MDF, once I had the template and the desired shape cut with a jigsaw I used the template as a guide for my electric router, I transferred the boat cleat shape into the 2 parts of MDF by using the template. As I did not have a long enough straight bit for my router (+36mm) I used 2 bits, a short straight bit and a flush trim bit with bearing running it around the template. It took a bit longer but the end result was satisfying and accurate.

(Just a quick note as how I connected the 2 split parts,  I connected the 2 parts of MDF with small pins making sure they will not be in the way of the router bit. )

After the pattern was complete the same pins are used to align the 2 half's when placed into the foundry flask, it is very important to make sure that the 2 parts are aligned accurately for a good aluminum casting results.
Next step after creating the boat cleat pattern from the MDF : I used my table router to round all the corners and create a groove in the MDF pattern giving it a depth and much more of a 3D attractive look.

In the next images you can see the stages and the different bits that I have used for the table router.
MDF is a great and easy material to shape, however as it is made from medium density fiber there are a few important highlights: 1st - its important to work with dust extractor and a good mask avoiding inhalation of the MDF dust. 2nd - as MDF has very rough edges when being cut it is important to seal the MDF pattern, I used a wood filler to improve the angle (Draft's) of the pattern and after the wood filler was dry I sanded the MDF pattern using different grades of sand paper until a smooth finishing was achieved. Last thing that I did was coating the pattern with gloss varnish, I had concerns that I will not be able to separate the 2 half's as I varnished the pattern with the 2 half's connected but to my surprise it was very easy to separate between the two sides and from this point the pattern was ready to be used for the sand mould.

At this point the split pattern was ready after adding 2 coats of varnish, the surface was glossy and smooth, I made the sand mould using a wooden flask & oil bonded sand for a good finishing. I did have some concerns that the sand mould might break around the straight sections of the pattern but the sand mould turned out very well with minor damages when I removed the split pattern.
After removing the split pattern from the sand mould I created the gating system in the sand, a poor gating system can lead to casting defects so this is a very important stage when preparing the sand mould, once the gating system is complete it is ready to be filled with molten aluminum.

Next I closed and clamped the flask and started to heat my homemade furnace, after the aluminum was in a molten stage I poured it into the flask and opened it after 1 hour, the solid aluminum boat cleat turned out very well with minor imperfections that were very easy to clean and fix.

In the next set of images you can see the solid aluminum boat cleat after taking it out from the sand mould. I used a reciprocating saw with a metal blade to quickly cut off the risers. Last part was to clean the aluminum casting and give it a light polish.

Here is my tutorial video with most of the steps, creation of the sand mould and the actual molten aluminum pouring creating the solid aluminum boat cleat, enjoy:

And here are a few images of the finished aluminum boat cleat.

Aluminum star casting using a homemade foundry + tutorials

It has been some time since my last post as I was very occupied for the past year. In this post I will share with you how I have created a solid aluminum star from scrap aluminum.
For the sand mould I used a plastic star pattern and oil bonded sand to create the sand mould.
All  the homemade foundry and foundry equipment that I used is D.I.Y.

Using this type of pattern is very easy to sand mould, one disadvantage is its not a split pattern so the sand mould process  takes a bit longer.
All that you need to start is to construct the foundry flask to hold the sand and either use foundry green sand or foundry oil bonded sand, and of course to construct a foundry ;-)...

So in the next set of images you can see the sand mould preparation process before and after removing the star pattern.
In the next images you can see the sand mould after separating the cope from the drag part of the foundry flask. The sand mould turned out very well so the next step was to create the gating system for the molten aluminum to fill the inner cavity and that will form the solid aluminum star casting.
In the next set of images you can see the aluminum casting "shakeout process", in other words to open the flask and either have a nice casting surprise or a  flop.....

Well the casting turned out very well so all that was left to do is clean all the access aluminum and give the aluminum star a semi polish finish.

In this post I wrote a bit less then I usual do.... :-) as I have created a 2 part aluminum casting tutorial so feel free to view, like, subscribe. Aluminum star casting part 1 (sand mould preparation):


Aluminum star casting part 2 (pouring the aluminum):