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  1. Bob Cox made experimental lenses and mirrors from...

    Bob Cox made experimental lenses and mirrors from Plexiglas. I think he polished them with a silver polish called Silvo, but that is a 50 year old memory. Interesting that he had the resources of...
  2. True, but it was also an incomplete one. For...

    True, but it was also an incomplete one. For example, is the hole bored clear through or blind? How long is the bore? What alloy of aluminum? Is the aluminum cast or rolled? Either way, the grain is...
  3. When you think about it, one micron is about 40...

    When you think about it, one micron is about 40 millionths of an inch, not very smooth. I would get it as smooth as I could with a hone or lap, then electropolish it. Astronomical mirrors have...
  4. If 10 microns is the light wavelength, infrared,...

    If 10 microns is the light wavelength, infrared, 2 microns finish is not out of reason. In the 60s I made concave mirrors for spectrophotometers from aluminum, but accurate imaging was not that...
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    I got the pictures to come in focus and went...

    I got the pictures to come in focus and went through the whole presentation. Either I am too stupid to understand the technology or it is nonsense.

    The problem with this sort of thing is that...
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    There is no explanation of how it works and the...

    There is no explanation of how it works and the photos are blurred.

    Bill

    Edit- I did some Googling and found more of the same BS. "Our motors are wonderful" but no real explanation. Sounds like...
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    These motors usually have provision for reversing...

    These motors usually have provision for reversing such as brush mounts that allow them to be rotated.

    Bill
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    Where do you find it? Not in Mexico. The only...

    Where do you find it? Not in Mexico. The only time I saw cabrito asada on a menu was in Neuvo Larado and it wasn't lunch time. I looked for it from Brownsville to Panahachel, Guatemala and never...
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    A friend wanted a rectangular bar that was an...

    A friend wanted a rectangular bar that was an improved fit in the table slots of his Craftsman table saw, the kind of job you would decline if it was a walk in stranger. I started with a 3/8" X 5/8"...
  10. There is a motor type that will do that nicely,...

    There is a motor type that will do that nicely, called a "hydraulic motor".

    Bill
  11. I have several patents on this subject....

    I have several patents on this subject. Unfortunately, the search system has changed since I last looked and the only ones I could turn up didn't apply here. I think part of the problem is that my...
  12. A company that rented billboard space had a...

    A company that rented billboard space had a problem with their boom trucks. There was no provision for retracting the telescoping boom except to point it straight up and release the mechanical brake....
  13. That is one reason these motors cost so much. I...

    That is one reason these motors cost so much. I used to repair GE tachometer generators with a similar armature. There were three coils per slot, but they were wound one coil in a slot, move to the...
  14. Trying to read an armature with a typical digital...

    Trying to read an armature with a typical digital meter usually means reading the resistance of the leads more than the armature. I have a Wheatstone bridge made by Leeds & Northrup that reads...
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    Besides all that, I have never heard a machinist...

    Besides all that, I have never heard a machinist say a good word about a punch press. Anyone who has been in this business for long has heard countless stories about fingers cut off, etc. Now if you...
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    I don't run machines like that but I work on them...

    I don't run machines like that but I work on them and watch others run them a lot. Anything but a completely killed piece, meaning multiple heat and chill cycles, is going to warp. They usually rough...
  17. As the auctioneer says, "Don't come in late." I...

    As the auctioneer says, "Don't come in late." I just got around to opening this thread and various of you seem to have done a good job so I will only make one comment. I made a lot of field coils,...
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    Is this the Delta grinder with the spindle...

    Is this the Delta grinder with the spindle mounted on a round pedestal? Make sure you keep it straight. I once let one get crooked and ground up against a shoulder, knocked a chunk out of the wheel....
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    It turns out to be even simpler. If I use the MT...

    It turns out to be even simpler. If I use the MT adapter for a stop, the parts are about 3/8" behind the jaws. The jaws have a concave radius but it is large enough that an indicator reads a low spot...
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    I have run this job before and know how to do it....

    I have run this job before and know how to do it. It is an ongoing periodical order from people who use this part in a system they build. The only issue is that centering is a bother. The tabs held...
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    TriHonu and G-coder have just the sort of...

    TriHonu and G-coder have just the sort of solutions I was looking for. In fact, the rubberband holding four strips could be extended to finding the center on a mill by putting the indicator on the...
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    Centering square stock in a 4 jaw chuck

    I am making some manifolds in 2" square 6061 T6. They have each end tapped 3/4 NPT with a partition between them with a small hole to limit gas flow. One end has four 1/4 NC mounting holes. They do...
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    First, to correct myself, it says the part is...

    First, to correct myself, it says the part is made in one machining, not a single chucking. I don't think the grooves are for rings. They are more likely labyrinth grooves, which means that the...
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    Ask Rehtek what it is. If you explain your...

    Ask Rehtek what it is. If you explain your situation, they should be willing to help. They say it is made with one chucking, so it is probably made on a CNC lathe with live tooling to cut the...
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    Motion, is there anyone with an active mind who...

    Motion, is there anyone with an active mind who does not have a chemistry explosion story? It's a rite of passage. One of mine is about the nitrogen tri-iodide I mixed up in my room at home. My...
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