I Did It!

• Woooo! On 03/26/2007 I started at 259. Today I'm at 199.

  That's right, just 1/2 lb per week. Slow and steady catches the worm. In graphical form:

  My BMI is still technically overweight, though. Granted, BMI isn't a very good measure, but in this case I agree with the assessment and I'm going to go for 10 more lbs.



• I've only recently started using multiple colors of clay together. I have an irrational fear of "using up" the clay when I mix it, even though a pound of clay is like $1. However, a clay model gathers impossible-to-remove dust and small nicks. So I've finally bitten the more expensive bullet of switching to sculpey.

  A 4 year old of my acquaintance calls this "the treasure cat" and a 2 year old, also of my acquaintance, calls it "measure cat". (Also, any Cheshire Experts will notice right away the wrong color I didn't notice until too late.)



• I have a scrollsaw from way back but the blade broke and it turns out that that size is hard to find. Then last weekend I found a bandsaw at the flea market! After some tuning and tweaking, it's running great.

  Is this

  the first step on the road to this?

  Doubtful. But maybe!

Discoveries

• The biggest difficulty in making something like a Stirling engine without access to a machine shop is how to make the power piston. The piston has to be precisely sized to fit inside the cylinder. However, via a YouTube video, I have discovered that it is possible to use a pair of PVC pipes to get the same effect. I made one and under breath power it worked so well it nearly knocked my teeth out. I haven't done any real testing yet, so I don't have all the construction details worked out, but basically you just get two sizes that differ by 1/4" and sand down the smaller until it fits in the larger.


• The way I'm going to test the piston is to build another Stirling. Need a bigger displacement chamber for a piston this big. Should be metal, not too thick-walled, largish, easy to make air-tight. A paint can would be perfect, except you don't want to combined leftover fumes and high heat. Turns out Lowe's sells empty paint cans! Quart- and pint-sized. That means you can even remove the lid to work on the innards and then reseal it.


• What with one thing and another, the flywheel on the new engine has to be mounted differently. I need a whole crankshaft dealie (which is something else it would be easier to make with a machine shop). Once I realized this, I realized I'd also need some kind of bearing. Idly reading something completely unrelated, I came across a mention of "skate bearings". I was thinking inline skates, but skateboards have the same thing. They are only like $1 each! And I even had an unused skateboard at home, from which I harvested 8 of them. ID ~8mm, OD ~22mm. Cute as a bug's bearing.


• I've had these drawing pencils for a while now. The leads are 2H, HB, 2B and then some high B one, I dunno what. The problem is you have to keep sharpening them like every 15 minutes. The other day I realized this is already a solved problem: mechanical pencils. The only question was, do they sell mechanical pencil leads in hardnesses other than HB? Answer: Yes. So now I have 3 mechanical pencils, each with a different lead. Makes drawing so much less of a hassle. Can't shade with the side of the lead, of course, but I never did that anyway.


• I'm not going to meet my Xmas diet goal. Scale is still going down, but too slowly to make it in time. Maybe I should aim for the secondary goal (an additional 10 lbs) at the 2 year mark (March?).

"School Tools"? "TooLibrary"?

Statement of Problem

I don't have the tools I want. Nobody I know has the tools I want. I don't have the money to buy the tools I want. And even if I did have the money, I don't have space for the tools I want. (The tools I'm thinking of are machine tools, such as a lathe, milling machine, etc. But it could also apply to automotive, woodworking, electronics and other things.)

Proposed Solution

I know I've seen at least a couple of businesses on this concept, but I can only find one now: TechShop. It's like an gym, but for tools. You pay a membership fee and you can go use their space, stuff and expertise. (For a more non-profitish take, there's also the MIT Hobbyshop.)

Of course, one could argue that if you are paying even as low as a mere $20/month (TechShop's actual lowest price is $100/month), you'd eventually be paying more than if you bought the equipment yourself. However, you still gain these advantages:

• lower startup cost - Instead of having to save up $N to buy the next tool, I immediately have access to all of them after the first membership fee.
• access to specialty tools - It would probably be pretty rare for me to need 5 axis CNC milling machine. But when that's the only thing that will work, it would be nice to have it.
• access to experts/help - This is either someone that works at the shop and gives classes or just the other users. Synergy, people.
• space - Unless I start throwing out family heirlooms, I'm not fitting more than one more power tool in the workshop.

However: Statement of New Problem

Places like TechShop tend to be in locations of high population concentration, particularly of a high-tech nature. The Bay Area. Research Triangle Park. And even at that there still isn't (or going to be) one in Boston. Plus $100/month is pretty expensive. The MIT Hobbyshop is only available to MIT students, faculty and staff. Other restrictions apply, void where prohibited.

Proposed New Solution

Almost every town, no matter how tiny, already has a high school with a shop. Some of them also have area vo-tech type schools. This is space that is already set up to

1. teach
2. a large group
3. of complete n00bs
4. to get immediate results

That's perfect, right?

Of course, you can't go during the school day. But nights, weekends and summers are plenty. This is especially true if you imagine where you might be storing your half-completed project. If it's something big, you might store it at the shop and then you are locked out when they are closed. But if it's small, you can work on it at home with what you have, then bring it to the shop during open hours. (Other hours possibilities would be just weekends, twice a week, etc.)

Another potential issue is whether insurance restrictions or byzantine school regulations would prohibit this. Apparently not, at least in my state. I thought of this idea when I saw the courses offered at my local high school. No shop classes, but according to the coordinator they have done so in the past. These are 8 one-evening-a-week sessions, generally. So you'd really need to just need to extend the class "indefinitely" and done. (I don't know how the instructors for these classes are chosen and/or paid. Maybe they are volunteers? Maybe they get some portion of the proceeds?)

Then we come to the little matter of the bill. How much would this cost? Here's where I think this plan could really work. The tools, space and (some of) the personnel are already paid for! It's part of the school district funding. The venture doesn't have to pay for the entire cost of everything, only for the marginal cost of expanding the hours. That marginal cost isn't zero, but neither would the membership fee.

Just throwing random numbers around: Shop classrooms are typically set up for about 10 students at a time, so let's call that a max nightly number. Let's also say the place is open twice a week and every member wants to attend on average twice a month. That's 8-9 open nights per month or 80-90 person-nights. So the entire membership could be 40-45. That also seems like a reasonable number of interested people living within a radius of a given high school. If each one is paying $20/month, that's around $10k/yr. Not a huge amount of income for the school, but perhaps enough to pay for itself? Some of the 8 week classes are listed at $100, so maybe $50/month is more reasonable.

Of course, I would be remiss in mentioning only the financial side. For instance, book libraries were not actually started purely as a cost-cutting measure, although they serve that function. They were started as an educational measure. Even if I'm well-educated myself, it makes sense for me (in terms of enlightened self-interest) to pay for the education of others. That's because the society I'm in will be better overall, including near me, if everyone else is smarter. If you consider knowledge a mental tool, then my idea is simply an extension of this.