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Type: Posts; User: Joe Gwinn

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  1. Replies
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    How thick a plate can you punch? Try various...

    How thick a plate can you punch? Try various thicknesses. That will tell you a lot.
  2. There is more to it than that. It's to keep the...

    There is more to it than that. It's to keep the bolts (or nuts) from unscrewing under vibration. If the bolt (or stud) is long enough, it will have enough elastic stretch to ensure that there is...
  3. Yes, but actually the varnish is easy to remove -...

    Yes, but actually the varnish is easy to remove - just use paint stripper. Varnish is just catalyzed vegetable oil.

    I use 5f5, one of the methylene chloride based strippers. Beware strippers...
  4. I has a Cool Mist system for a while. It did...

    I has a Cool Mist system for a while. It did work, but filled the shop with a fog bank, necessitating a respirator. Went to drip/flood coolant using soluble oil, been using it ever since.
  5. When planning the lighting scheme, think about...

    When planning the lighting scheme, think about head shadows. Flush overhead lights often sent light only down, so your head shadow is always in exactly the wrong place. In my office, I have four...
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    I learned the water trick at a McDonalds when I...

    I learned the water trick at a McDonalds when I was about 18. Their griddle was a 4' by 8' sheet of hot rolled steel, from the looks. It was not all that thick, maybe 0.5", and so cannot have been...
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    I've been pouring a half-cop of warm water into a...

    I've been pouring a half-cop of warm water into a 10" or 12" Lodge skillet that is around 500 F (bacon grease smokes) for years, without any effect other than getting a clean skillet.
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    Thermal mass. And the fact that even a red heat...

    Thermal mass. And the fact that even a red heat does not destroy an iron pan.
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    The nitrided cast iron pans I found on Google has...

    The nitrided cast iron pans I found on Google has pressed sheet steel pans with cast iron handles. Not exactly what one usually means by "cast iron pan". Am I looking in the wrong place?
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    Field Company skillets look very well made, but a...

    Field Company skillets look very well made, but a bit too rich for me.
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    I have one of those, and it does work, but don't...

    I have one of those, and it does work, but don't usually use it any more.

    What I do is a method I learned from a short-order cook at a MacDonalds in the 1960s, when I worked there one summer. ...
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    Pictures are too blurry to be useful.

    Pictures are too blurry to be useful.
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    I know of some boutique makers of cast iron...

    I know of some boutique makers of cast iron cookware, at astounding prices. I don't know of any realistic makers. (The Chinese pans one sees in discount shops are too thin and light to work well.)...
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    Looks like buildup on the cutting bit causing...

    Looks like buildup on the cutting bit causing welding and tearing. Mild steel likes oily flood cooling.
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    Machining cast iron cookware

    I have a lot of cast iron pans, and my wife also loves them for cooking.

    However, Lodge no longer offers the "polished" (inside surface sanded flat) finish, instead leaving the surface as cast. I...
  16. The manufacturer still exists and supports these...

    The manufacturer still exists and supports these machines. They make new parts to fit old machines. Expensive, but fit perfectly.

    Logan Actuator Company: Logan Actuator Co. - Lathe Department
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    I'd look for a loose power wire that is making...

    I'd look for a loose power wire that is making and breaking in response the the contactor closing and opening.
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    The heads on flat-head rivets and machine screws...

    The heads on flat-head rivets and machine screws for airplanes are 100 degrees included angle. This came out of WW2 airplane manufacturer starting to make airplanes out of aluminum. Button-head...
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    Just some normal wear then. But there may be...

    Just some normal wear then. But there may be some very fine dirt in the grease. I'd clean and regrease, and carry on. I usually use Mobil 1 synthetic grease for such things.
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    What are these bearings being used for? A rock...

    What are these bearings being used for? A rock crusher or a lathe spindle?
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    My recollection from an article in Aviation Week...

    My recollection from an article in Aviation Week is that the epoxy is cured under heat, 250 F if I recall. That would solve the moisture problem, and epoxy is chemically aggressive at that...
  22. I's ask Logan Actuator Company - they probably...

    I's ask Logan Actuator Company - they probably support these lathes, or know who does.

    Logan Actuator Co. - Lathe Department
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    Is it for food-contact uses? If yes, I bet lard...

    Is it for food-contact uses? If yes, I bet lard or lard oil would work, and these are edible.
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    US leadscrews are often eight threads per inch,...

    US leadscrews are often eight threads per inch, which would be 3.175 mm pitch, close enough to 3mm to be confusing.

    I'd measure the leadscrew pitch by counting turns over its whole measured...
  25. I'd figure out what is worn and by how much...

    I'd figure out what is worn and by how much first. It may turn out to be something that one can replace without doing anything as fussy as re-scraping or machining precision surfaces.
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