Thread: Sand Cast Cowl Steering Blister

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Hi everyone, I am a new guy here I did an intro just the other day on the main forum. I am aware that this forum is for '32's but I thought you guys might be interested in how I made a cowl steering blister for my '29. Same methods, slightly different geometry.

I've been casting parts for awhile now, mostly motorcycle parts for friends on the side. I dig cowl steering and am going to run it on my 29 roadster project. I wanted to design and cast something for a "blister" to make the pitman arm look a little more integrated to the cowl. I have 3-D cad and a 3-D printer so I designed my "master" scaled it up for shrink and printed it out followed by some finish work.

There is a lot of stuff on sand casting online so I wont go into too much detail on the process.

Pic#1 shows the finished master.
Pic #2 and 3 show each half of the mold "rammed up"
Pic #4 shows the mold just after it is poured.
Pic #5 shows the finished cast part still attached to the sprue and riser. Basically I filled the sprue until I saw the molten aluminum come up the riser. In this case both the sprue and riser continue to supply aluminum into the cavity as the part shrinks.

I will add more pics going forward but if there are any questions on the process ask away.