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Step 7Drill and clean up metal
This is really the tedious step.
First, tape some emery paper (i used 220 grit for this brute task) to a desk or piece of glass. Grind the inner face of the drive case until it is flat, using a figure eight motion to keep the wear even.
Next, use a small ball burr to clean out the inside of the drive case and cap until your board fits snugly again. The case will shrink during the casting process, so remove a tiny bit of metal until you can pop the board back in there.
Drill the rivet holes in the four little leg posts.
Clean up the case a little. I had a hole in my cap, so i melted a big blob of silver solder there and filled it up (not very professional).
First, tape some emery paper (i used 220 grit for this brute task) to a desk or piece of glass. Grind the inner face of the drive case until it is flat, using a figure eight motion to keep the wear even.
Next, use a small ball burr to clean out the inside of the drive case and cap until your board fits snugly again. The case will shrink during the casting process, so remove a tiny bit of metal until you can pop the board back in there.
Drill the rivet holes in the four little leg posts.
Clean up the case a little. I had a hole in my cap, so i melted a big blob of silver solder there and filled it up (not very professional).
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Feb 25, 2008. 9:06 AMpeteohms
says:
Step 6 you have wax. Step 7 you have metal. What happened in between?
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Feb 25, 2008. 1:40 PM
Robotrix (author)
says:
Robotrix (author)
says:
check out the wikipedia article on lost wax casting. It's enough extra information that i didn't want to throw it in the middle of this instructable. You could either do this step yourself like I did, or take the wax to any casting house and they would be pleased to cast it for you.
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