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  1. R

    Optimal number of boiler tubes.

    I use to work for a boiler company we use to build and repair boilers 25 years ago. There are formulas to calculate heat transfer through each tube. You need to know, tube diameter, length, type of metal, metal thickness, number of tubes, heat source, gas, wood, coal. Fire box should be...
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    Shop built sparkplugs for model engines

    Fire clay works great. You only use a tiny amount of water 2% or 3% then compact it very tight under pressure. Build a die squeeze it hard in a vise. Let it dry natural for 1 week then bake it in an oven. There are 1000s of different size spark plugs I bought some with 1/4-28 threads many...
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    Home built pistol

    I built a 12 gauge shotgun pistol once it had a 4" long barrel. At a distance of about 20 ft it had a pattern the size of a garage door. LOL. It was fun to shoot but good for nothing. I had a lot of fun letting other people shoot it. The only gun I have now is a very nice quality pellet...
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    Home built pistol

    I built a BB machine gun about 30 years ago it held about 4000 BBs it was not a gatling gun. I ran it on an air compressor 5 psi to 150 psi. It shot about 1000 BBs per minute. At 100 psi it would shoot threw, aluminum cans, plastic bottles, cardboard, break glass bottles. I took it to work...
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    What have you been doing today?

    When I lived in Arizona wind was perfect to fly kites. I had lots of fun with kites. A 1/2 mile of string sags so we put 8 kites on the same string 300 ft apart. We had several different kites for doing different things. Now I live in gusty wind Tennessee where wind speed can be any speed...
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    Head gasket

    I make gaskets for my model airplane engines. I made a punch die set to hand punch gaskets quick and easy from copper or aluminum. First I punch out a .875" diameter slug. Slug goes into another die to punch a .750 diameter hole in the center of the slug. My metal thickness is .020" or...
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    Cutting a cam with radiused flanks

    I made a cam on my rotary table.
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    How to make piston rings.

    Watch the video. Interesting.
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    Needle bearings in a model diesel ?

    This is a TEST to see if my email to this forum works, I keep getting a message, email is now $69.95 sign up now.
  10. R

    What have you been doing today?

    When I was growing up in grade school in the 1950s we lived in central Illinois the soil was soft & sandy and we had an afternoon 15 min rain every day all summer about 5 pm. My grandfather cut potatoes into 1" pieces to dry 1 week before planting about May 25. He planted cuttings 8" apart 3...
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    What have you been doing today?

    About Feb 15 I bought 10 lbs of Red Norland potatoes from the grocery store and 5 lbs of Kennebec potatoes from garden supply store. We had 2 yellow grocery potatoes in the kitchen pantry. I kept potatoes in a north window every day to grow short stubby chits. April 1st I cut potatoes into 1"...
  12. R

    What have you been doing today?

    I planted 192 potato cuttings with 1 eye each. We hope to have about 500 lbs of Red Norland potatoes and about 300 lbs of Kennebec potatoes in about 4 months.
  13. R

    I bought a lathe, mill, and a bandsaw, how did I do?

    I will make someone a good very deal on it. I don't need it anymore. I would rather have the extra floor space than the grinder.
  14. R

    I bought a lathe, mill, and a bandsaw, how did I do?

    I paid $1500. for the surface grinder 30 years ago. I would love to get as much as I can, we need to talk about a price that works for both of us. I don't use it, it needs to be gone. I used it for plastic injection mold work but been retired for a while, the grinder is taking up floor space...
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    I bought a lathe, mill, and a bandsaw, how did I do?

    Murfreesboro TN. Reid #2 surface grinder.
  16. R

    I bought a lathe, mill, and a bandsaw, how did I do?

    Are you in Spring Hill TN? I am in Murfreesboro TN. Do you need a surface grinder? I have 1 I don't use anymore.
  17. R

    I bought a lathe, mill, and a bandsaw, how did I do?

    ADs cover my entire computer monitor. There is a space 2" tall 8" wide with no ADs. Maybe ADs blocker will stop all these ADs???
  18. R

    Tornado Season is here

    We are tried of living in tornado alley. More storms Wed.