Aidan's Weights & Measures  3           11-2016

The router wasn't able to get into the corner so I had to work this area by hand.



I used a scrap piece of wood as a sanding block which worked great for this. And it went quickly to.



The next thing I'll be working on is some clear plastic. I plan on printing out the information for each piece of material and I'll use this plastic to cover it with, like a plaque would have. At first glance it looks like I'm machining the wood here. Actually the wood is being used as a clamping aid, which is helping me hold down the plastic (arrows).



I'll be using three screws to hold the plastic down. Here I'm drilling the holes for the screws. After drilling I chamfered them all for flathead screws. I drilled the ends first and then moved to the center. I did this for both pieces of plastic.



I placed both plastic pieces exactly where I wanted them and held them in place using tape. Once they were in position, I drilled the screw holes.



Once the holes were drilled, I screwed them in by hand to make threads in the wood. And wouldn't you know it, two of them broke off while I was doing this. Now I know better than this because these screws are made out of brass. What I should have done was use a screw made out of steel to prevent this from happening. I had to drill them both out on my milling machine and then re-thread them. This didn't take long but could have been avoided.



I sanded everything with 180 and then 220 grit paper.



A close up of the base before I put a finish on it.



This is a piece of titanium that got from my work that started out as a large ring. It was a scrap piece that I had to machine square first and then I turned it on a lathe. I used a three jaw chuck to turn it with and as you can see I didn't have much room for error while doing this. I did this for all the irregular shaped pieces and once everything was the correct size and length, I was ready to weigh them all.



One evening when Aidan and his mom, Stefanie came over for dinner, I had my grandson help me weigh each piece of material. The digital scale that you see below came from my work and is very accurate. As we used it, I had Aidan write down how much each one weighed (in grams). The piece on the scale is copper.



In the foreground you can see a box of brass 'standards'. These standards get calibrated each year and are used to verify that the scale is weighing correctly. The piece on the scale is plastic.



I printed out a list of the materials that I'd be using and you can see Aidan has written down all the weights. I guessed at which one would be the heaviest to the lightest and I came close but I had to switch two of them around (arrows). As we weighed all the pieces I wrote it's corresponding number on each one using a felt marker. The reason for this is because I wouldn't even know the difference between mild steel and stainless steel if they were placed side-by-side. Yes, those two metals really do look the same. 


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