![]() The solving of bimetallic corrosion problems is a matter of getting a nonconductive material between the two different metals. The additives used depend upon the type of metal(s) involved, the user’s chemical restrictions, additive availability and the fluid used.īimetallic corrosion is the corrosion of two different metals in contact with each other and occurs when a transfer of electrons from one metal to another takes place with the cutting fluid acting as a conductor. If a fluid user objects to increasing the concentration of his central system mix for reasons such as foam and potential skin problems, it may be necessary to increase rust protection with the use of additives. If the concentration of 1:30 (3.3 percent) was adequate during fall and winter, then the concentration may need to be increased to 1:25 (4 percent), or to the point where rust is no longer seen. If the concentration of the fluid, which provided rust protection during the fall and winter months, does not provide protection when the humidity climbs, an adjustment in the fluid concentration is necessary. Moisture condenses on a part and acts as an electrolyte to form a galvanic cell. High temperature in the presence of moisture and oxygen in the atmosphere is the reason corrosion happens more in the summertime. VIDEO: Emerging Leaders’ Viewpoints on Training and RetentionĪs temperature increases, the rate of all chemical reactions also increases. Corrosion is not usually as much of a problem in arid states, such as Colorado, New Mexico, Arizona, Utah and California, because the relative humidity is usually low. ![]() This applies to the Eastern and Midwestern areas of the United States. Seasonal CorrosionĬorrosion can occur at any time during the year, but normally it occurs more often during July, August and September when temperatures and the relative humidity are high. However, corrosion can occur even with dry cutting and is not simply due to the use of water-based fluids. Thus, corrosion is a problem faced by every user-and manufacturer-of water diluted metalworking fluids. Water has a greater capacity for removing heat than oil however, water alone in contact with freshly machined metal leads to corrosion. Effective heat removal yields good tool life and dimensional accuracy of parts. Heat removal is one of the most important functions of a metalworking fluid. Both ferrous and non-ferrous parts are vulnerable to corrosion. image from.Rust is a type of corrosion that occurs on iron and steel parts. It's a ring gear for an ore crushing machine. Maybe who ran the Auctions, what was sold and who to. It might be worthwhile to get in touch with the Bendigo Historical Society, and the Bendigo Society of Model Engineers, they could provide a few leads. In later years they did some civillian contract work. ![]() I remember the Bendigo Ordinance factory, they had some pretty big machines for making bits and pieces for ships, as well as making some pretty heavy ordinance. Armed with that info we are asking the usual suspect machinery dealers if they might have some green oddity of a vertical head resting on a shelf somewhere. There must be lots of Deckels and Schaublins on farms up in that part of the world. ![]() We did learn that there was an ammunition factory in Bendigo that closed up years ago, and there were lots of interesting machines that entered the auction stream up until about six years ago. The good news is the entire power feed mechanism is only about 14 discreet parts more than the feedscrew assembly alone (which is another 18).įinally, the Nichols head made me think of Maho heads which could work on this beast with a simple 1:1.5 gearbox assembly in a casting that translates the Perrin mounting to the Maho. The saddle was lifted off last week, and we pulled the x table from the Deckel Tuesday night in order to see what parts need to be made. We did learn that there was an ammunition factory in Bendigo that closed up years ago, and there were lots of interesting machines that entered the auction stream up until about six years ago. We were offered a head from a Nichols mill, but it was rusted frozen, and had rust inside the NMTB40 taper spindle socket. When last we left this saga, Mike and I were on the trail of a lead, which fizzled out.
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