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Type: Posts; User: Robert R

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  1. Replies
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    For comparison, the small, 2 cfm Balston brand...

    For comparison, the small, 2 cfm Balston brand pressure swing air dryers run on a 5 minute switching cycle. These dryers are designed to provide -100 deg F dew point air. The switching cycle is...
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    14,231

    A floating crane ship needs to hold its roll and...

    A floating crane ship needs to hold its roll and pitch angle constant in order to assemble payload bolted connections. The crane hook needs to maintain constant height with repect to the worksite...
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    1,124

    There is one other inexpensive repair. Remove...

    There is one other inexpensive repair. Remove the broken gear from the headstock and replace it with a VFD to fill in for the missing speed range. All you need in the gear train is a low, middle...
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    1,124

    The heat ring-rainbow pattern on the gear ...

    The heat ring-rainbow pattern on the gear suggests that the gear may have been made of 4140 with a induction hardened tooth rather than 8620 with a case hardened tooth. If the gear is 4140 it will...
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    1,400

    Can you substitute a "improved" Bendix drive?...

    Can you substitute a "improved" Bendix drive? This design may have a torque spring shock absorber.

    Ford Starter Drive for Ford 9N,8N,2N - 52-11350C
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    688

    A few numbers: The heat capacity of water is...

    A few numbers:

    The heat capacity of water is 1.0 BTU/lb-F

    or
    Cp= (1.0 BTU/lb-F)(.293 Watt-hr/BTU)(62.4 lb/ft**3)(.1337 ft**3/gal)(60 min/hr)= 147. Watt-min/F-gal

    The 3/8" diameter copper...
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    688

    The ASM Metals Handbook, Vol.15, Casting,...

    The ASM Metals Handbook, Vol.15, Casting, suggests 10% heat loss for a channel furnace and 20% heat loss for a coreless (helical tube around the crucible) furnace.
    Your original chiller was setup to...
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    2,452

    The combination of aluminum, cast iron, steel,...

    The combination of aluminum, cast iron, steel, and brass is very unforgiving when immersed in a electrolyte. The aluminum will rapidly go into solution unless the coolant concentration is maintained....
  9. Replies
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    1,910

    That is the idea. A toolroom grinder wheelhead...

    That is the idea. A toolroom grinder wheelhead may weigh less than 400 pounds. That weight limits the maximum pressure that can be applied to the grinding wheel.

    The manufacturers should be...
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    1,910

    There are a number of different processes for...

    There are a number of different processes for producing micro crystalline abrasive. 3M was the first manufacturer to file a patent and begin production in 1981. Their patent was specifically for...
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    1,194

    Powdered aluminum will react with water to form...

    Powdered aluminum will react with water to form aluminum hydroxide and hydrogen. The reaction rate is temperature dependent and it is unstable. The hotter the water the faster the reaction rate....
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    A quick history of aluminum oxide abrasives: ...

    A quick history of aluminum oxide abrasives:

    The white aluminum oxide abrasives are pure alumina and do not contain titanium or iron oxide impurities. The grey, brown, blue, and red aluminum...
  13. The glass disks with the internal bubbles are...

    The glass disks with the internal bubbles are made from Pyrex low thermal expansion glass. A quick check with a flashlight will reveal what the focal length of the mirrors are.

    The glass disk...
  14. Replies
    19
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    2,741

    A reciprocating table type surface grinder with...

    A reciprocating table type surface grinder with a vertical spindle turning a cup wheel might be a good compromise. This type of machine would limit you to narrow work pieces such as your cutter...
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    2,130

    There were two large heavy equipment...

    There were two large heavy equipment manufacturers in Sunnyvale.

    Westinghouse Marine Division: It was originally the Hendy mining equipment company established in 1906. It latter made triple...
  16. There are a number of articles written about the...

    There are a number of articles written about the precision machine tool industry in Keene New Hampshire. There is one history that describes the sequence of events in detail. I cannot find it at the...
  17. An extreme example of what is possible can be...

    An extreme example of what is possible can be seen at the Precitech or the Moore Nanotech websites. The products are lathes with nanometer accuracy. The machines at both companies were designed and...
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    The masks used during the Spanish Flu epidemic...

    The masks used during the Spanish Flu epidemic were cloth on wire frames. The face fitted frame held the cloth away from the nose and mouth. The cloths were changed every few hours. The separation is...
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    The earlier reply about rigging the 14X54 and...

    The earlier reply about rigging the 14X54 and longer Pacemaker lathes does NOT apply to the 14X30 lathe. The headstock end lifting bar hole for this lathe is located at the lathe's center of gravity....
  20. The compound base slide may be the remains of a...

    The compound base slide may be the remains of a hydraulic tracer attachment.
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    A 1020 cold rolled 1 3/8 bar will also work with...

    A 1020 cold rolled 1 3/8 bar will also work with 7000 pound basket load rated polyester lifting straps. The lathe weighs 8600 pounds. The eye hooks on the straps rest against the lathe bed. The bars...
  22. This question and answer blog dated 2011is a...

    This question and answer blog dated 2011is a description of how to operate both freight and passenger car air brakes There is also some discussion of trains that have been equipped with...
  23. No one has described yet how railway cars are...

    No one has described yet how railway cars are assembled to form a train. The process is known as humping or kicking depending on the grade at the rail yard. It involves shoving each rail car down the...
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    Vent and drain holes are required if the tubular...

    Vent and drain holes are required if the tubular structure will be galvanized. There are a number of industry guides on the internet describing the location and size of the required holes.

    Zinc...
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    No one has mentioned Carpenter Steel in this...

    No one has mentioned Carpenter Steel in this thread. DuckDuckGo displays a number of distributors.
    ...
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