I need to find a source for 4" brass screws to bolt my cores together. Seems I go through this exercise every few years, so I know they exist. My purchasing agent tells me he can get stainless but I've only used brass.
thanks Bob N9NEO
How about Brass All thread & brass nuts. 3' length, cut to the size you need.
Why not use the stainless?
--
John Larkin Highland Technology Inc
Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
If there's any flux leakage, brass (diamagnetic) doesn't become an important part of the magnetic circuit, while stainless (ferromagnetic) does. Another good diamagnetic material is nickel silver (stronger than brass) which one sees in lots of old meter movements.
does.
Good stainless screws are nonmagnetic or slightly magnetic. Should be OK.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
AISI 304 is very nearly nonmagnetic (depending on hardness; permeability is single digits, near 1 in any case), and also has higher resistance than other metals (if any flux wants to go through it, it's welcome to; there's little eddy current stopping it).
Surrounded by a massive block of ferrite, the thread material doesn't matter.
Now... you didn't mention if this is gapped. If it is, even brass and copper will heat up, because the fringing in the gap is quite intense. Gapped cores need external clips (away from the gaps, or on the opposite side of a singly-gapped core).
As for all-thread, seconded.
Tim
-- Deep Friar: a very philosophical monk. Website: http://seventransistorlabs.com
I've got a bag full of magnetic 1/4-20 brass screws. I can pick up a few of them with a strong magnet. George H.
does.
As somebody pointed out, there are some alloys of stainless that are nearly diamagnetic.
Almost all stainless steel kitchen knives and pots and pans are ferrous. Both ferrous and non ferrous alloys of stainless are used industrially as "food grade" with the diamagnetic stainless alloys being the more expensive ones.
Did they use white tin instead of grey?
White tin is paramagnetic, while grey tin is diamagnetic.
Brass is any alloy consisting primarily of copper, usually with zinc. In some cases, copper with tin is considered a type of brass, although this metal historically has been called bronze.
This is a list of common brass alloys, their chemical compositions and the uses of the different types of brass. Brass Alloys
-------------------- Alloy Composition and Use
Admiralty brass 30% zinc and 1% tin, used to inhibit dezincification
Aich's alloy 60.66% copper, 36.58% zinc, 1.02% tin, and 1.74% iron. Corrosion resistance, hardness and toughness make it useful for marine applications.
Alpha brass Less than 35% zinc, malleable, can be worked cold, used in pressing, forging, or similar applications. Alpha brasses have only one phase, with face-centered cubic crystal structure.
Prince's metal or Prince Rupert's metal alpha brass containing 75% copper and 25% zinc. Named for Prince Rupert of the Rhine and used to imitate gold.
Alpha-beta brass or Muntz metal or duplex brass 35-45% zinc and is suited for hot working. It contains both ? and ?' phase; the ?'-phase is body-centered cubic and is harder and stronger than ?. Alpha-beta brasses are usually worked hot.
Aluminium brass contains aluminium, which improves its corrosion resistance. Used for seawater service and in Euro coins (Nordic gold).
Arsenical brass contains an addition of arsenic and frequently aluminium and is used for boiler fireboxes.
Beta brass 45-50% zinc content. Can only be worked hot producing a hard strong metal that is suitable for casting.
Cartridge brass 30% zinc brass with good cold working properties. Used for ammunition cases.
Common brass, or rivet brass 37% zinc brass, standard for cold working
DZR brass dezincification resistant brass with a small percentage of arsenic
Gilding metal 95% copper and 5% zinc, softest type of common brass, used for ammunition jackets
High brass 65% copper and 35% zinc, has a high tensile strength and is used for springs, rivets, screws
Leaded brass alpha-beta brass with an addition of lead, easily machined
Lead-free brass as defined by California Assembly Bill AB 1953 contains "not more than 0.25 percent lead content"
Low brass copper-zinc alloy containing 20% zinc, ductile brass used for flexible metal hoses and bellows
Manganese brass 70% copper, 29% zinc, and 1.3% manganese, used in making golden dollar coins in the United States
Muntz metal 60% copper, 40% zinc and a trace of iron, used as a lining on boats
Naval brass 40% zinc and 1% tin, similar to admiralty brass
Nickel brass 70% copper, 24.5% zinc and 5.5% nickel used to make pound coins in the pound sterling currency
Nordic gold 89% copper, 5% aluminium, 5% zinc, and 1% tin, used in 10,
20 and 50 cts euro coinsRed brass an American term for the copper-zinc-tin alloy known as gunmetal, and an alloy which is considered both a brass and a bronze. Red brass usually contains 85% copper, 5% tin, 5% lead, and 5% zinc. Red brass may be copper alloy C23000, which is 14-16% zinc, 0.05% iron and lead, and the remainder copper. Red brass also may also refer to ounce metal, another copper-zinc-tin alloy.
Rich low brass (Tombac) 15% zinc, often used for jewelry
Tonval brass (also called CW617N or CZ122 or OT58) copper-lead-zinc alloy
White brass brittle metal containing more than 50% zinc. White brass may also refer to certain nickel silver alloys as well as Cu-Zn-Sn alloys with high proportions (typically 40%+) of tin and/or zinc, as well as predominantly zinc casting alloys with copper additive.
Yellow brass
I think you mean "ferromagnetic", rather than "ferrous".
All steels, stainless or otherwise, are ferrous, since they contain iron.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
(ferromagnetic) does.
brass) which
No, JL. It depends on the particular SS involved, some are highly ferromagnetic, some are almost diamagnetic, most are in between.
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