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Type: Posts; User: John Chamberlain

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  1. Replies
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    How do you find screws and bolts?

    I have a lot of trouble finding screws and bolts that match my needs. Typically I want to buy a box of 100 so making a custom order or getting a "quote" is not an option.

    I know about standard...
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    2,163

    I would not mull over it. If you like making...

    I would not mull over it. If you like making pans, then presumably you have made at least one already. Try selling it on ebay. If it sells, sell another one.

    You will very quickly find out the...
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    924

    Its a mass standard, not a weight standard.

    Its a mass standard, not a weight standard.
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    924

    Here is an interesting article on a project to...

    Here is an interesting article on a project to create 2 "perfect" spheres exactly one kilogram in mass:

    http://www.cnn.com/2007/TECH/science/06/15/australia.spheres.reut/index.html

    The target...
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    1,154

    I am interested in finding small-quantity...

    I am interested in finding small-quantity suppliers of screws, particularly in stainless steel. McMaster-Carr is the best I have found, but I am interested to know if other people have good screw...
  6. It's not a probe. It's a Klingon abduction vessel...

    It's not a probe. It's a Klingon abduction vessel and it's comin to git ya.
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    6
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    932

    Anything is patentable if you can trick the...

    Anything is patentable if you can trick the patent engineer into believing it is a novel device. Since patent engineers are typically 22-year-olds with more interest in job security than mechanics...
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    5,500

    The reason why the Imperial system is superior is...

    The reason why the Imperial system is superior is that 12 can be divided evenly two different ways whereas 10 can only be divided evenly one way.

    The Imperial System is twice as good as the metric...
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    Well, I just eyeballed it, but the core of the...

    Well, I just eyeballed it, but the core of the bit had that light gray zinc-like look to it. Also, it had air bubbles which I guess tend to indicate it was cast.
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    I found a PH-3 phillips head screwdriver bit...

    I found a PH-3 phillips head screwdriver bit discarded the other day which had sheared off at the tip.

    On closer examination it appeared that the bit (stamped "CHINA") was actually made of a zinc...
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    Spooh specifically says the normal stresses you...

    Spooh specifically says the normal stresses you would expect for 4140 are not there. For example, normally 4140 is used in torsion applications like spindles, but he specifically says torsion and...
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    4130 is often selected for fatigue situations...

    4130 is often selected for fatigue situations where weldability is desired. If it has fatigued and bent it may mean nothing more than the part has reached its lifetime. If you bend metal back and...
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    There are a lot of factors here. For example, is...

    There are a lot of factors here. For example, is this a high-volume part where the metal cost is significant or for a machined part where the labor to make it is the dominant cost?

    To make a...
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    From what I have seen it would be hard to do...

    From what I have seen it would be hard to do do-it-yourself dental work. Although you might be able to create a makeshift solution the likelihood would be something with problems. For example, if...
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    Gravity makes a vertically hung table slightly...

    Gravity makes a vertically hung table slightly eliptical so the graduations on the top and bottom become closer together and those on the sides become spaced farther apart. That's why you have to...
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    I've heard perfume is bad for you. Definitely...

    I've heard perfume is bad for you. Definitely avoid the stuff.
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    1,129

    Breathing anything except air and small...

    Breathing anything except air and small quantities of water is bad.

    When I am working in the presence of "particulates" I wear a respirator and close fitting nitrile gloves.

    I've been looking...
  18. Replies
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    It is easy to turn a ring freehand (try it with...

    It is easy to turn a ring freehand (try it with aluminum). After buffing it will look like it came out of a jewelry shop.

    Don't lose any of the chips. :D

    Gold is always soft, but will...
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    Ideally you need to keep the copper at the...

    Ideally you need to keep the copper at the annealing temperature (500-1000 F) for a while, like 20 minutes at least.
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    To drill this one strategy is to make an annular...

    To drill this one strategy is to make an annular jig. It's pretty simple. Turn a ring that has the ID equal to the shaft and an OD +5/8" or so. Cut the ring in half. Grind or mill off 1/16" from all...
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    What do you mean by "pourous"? Epoxy with sand in...

    What do you mean by "pourous"? Epoxy with sand in it does not sound too porous.

    A really easy material to mold and gives a good, smooth surface is cerrosafe. It hardens to a soft metal with kind...
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    You can buy benders from Harbor Freight. ...

    You can buy benders from Harbor Freight.

    Personally I would use a conduit bender to do this. You can get conduit benders from any big hardware store.

    Here are some instructions:
    ...
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    Of course it depends what you are doing, but... ...

    Of course it depends what you are doing, but...

    (1) 4-jaw chuck
    (2) Noga stand (accept no subsitutes)
    (3) .0005 test indicator
    (4) angle gage set
    (5) Jacobs chuck for the footstock

    If you...
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    Yeah, I screwed up. Its 21,000 pounds for every...

    Yeah, I screwed up. Its 21,000 pounds for every FOOT of concrete (not every inch!) To make up for my egregious error I dragged my butt over to my construction books and looked this up. Here is my...
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    It's a mud snake. They eat eels and other...

    It's a mud snake. They eat eels and other amphibians.

    Another innocent creature destroyed by fear and ignorance.
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