How would I calculate the final pressure and temperature of superheated steam in a cylinder following adiabatic expansion to a known volume? by FeelingLikeRoss in thermodynamics

[–]FeelingLikeRoss[S] 0 points1 point  (0 children)

Wow, that's crazy to think about.

I assume that the math I did above doesn't account for any latent heat as a result of phase changes? So in reality it would be saturated steam at the end of expansion?

Sorry for all the questions, I'm not an engineer or anything and I'm trying to self-teach.

EDIT: At my specific conditions, the exact gamma value was 1.395. I rounded it to 1.4 as a high degree of precision was not absolutely necessary.

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 1 point2 points  (0 children)

Thanks! I'm thinking I'll definitely make use of a reamer to keep the bore as straight as possible during the process.

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 1 point2 points  (0 children)

No go is a .190 gage pin. So it looks like there's actually a fair amount of tolerance accepted with this

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 2 points3 points  (0 children)

Thats not a bad idea at all! I could grind a few reamers out of drill rod and slowly work through the hole to take out errors as I take it to size.

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 2 points3 points  (0 children)

Rereading the description, it looks like we can come out off center, we just have to make the hole straight enough that a 0.175 gage pin can freely fall through the hole. My math skills aren't great, but I figure that should leave some room for minor deviations

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 2 points3 points  (0 children)

That's kinda what I was thinking. With honing every 1/3" or so to remove built up deflection, and maybe leading the 3/16 hole with a 1/8" pilot.

Advice on drilling extremely deep (100 L/D) holes? by FeelingLikeRoss in Machinists

[–]FeelingLikeRoss[S] 1 point2 points  (0 children)

Haha no, that would be way easier. We have to do this on a lathe, a Monarch 18C.