軸承-電機軸承的正確安裝方法

　　長期以來，電機修理人員只注重塑膠軸承電氣部分（主要是繞組）的工藝，忽略機械部分（主要是滾動軸承）的安裝工藝。

　　這幾年，市場上的劣質滾動軸承不斷增多，導致機械部分故障明顯偏多。機械部分的故障修理主要是更換安裝滾動軸承。傳統的電機教科書上，介紹用鐵錘擊打鐵棒沖擊滾動軸承內套來安裝，在實際的操作中，這種工藝費工、費力，很容易傷到修理人員，常將滾動軸承損壞、損傷。由于軸承內套受到的沖擊力是不均勻的，常將內套沖碎或變形，使內、外套之間的滾珠、滾柱加快磨損，軸承會過早損壞，造成電機掃膛，陶瓷軸承也常將全密封、半密封的潤滑脂擋圈沖掉或變形（目前電機以安裝使用全密封滾動軸承爲主）。軸承在工作時，潤滑脂受到壓力、溫度的作用，會外溢到繞組上，尤其在高速、重載，高溫等條件下最爲明顯，這些隱患，最終因掃膛或繞組過髒而燒毀電機，既影響生産生活，又會造成經濟損失。所以滾動軸承的安裝不容忽視，必須提高滾動軸承的安裝工藝。

　　電機所用的滾動軸承分全密封型、半密封型和非密封型，以使用全密封軸承爲主。在電動工具電機上，常用：608、629、200、201、202、203等型號；在家用微電機上，常用：608、629、200、201、202、203、204、205等型號；在汽車電機上，常用：201、202、203、204、303、304等型號；在單、三相中小型電機上，常用：203、204、205、208、303、304、305、306、308、309等型號。筆者車制加工的“軸承沖筒”（專用工具）外形見培林圖1所示。加工尺寸見表1所示。在安裝軸承時，可在內套上塗上一層薄薄的潤滑脂，用鐵錘擊打軸承沖筒的非開口端，軸承沖筒的端面與軸承內套的端面接觸面積大，受力均勻，這樣安裝省工省力，對操作者又安全，更不會損壞、損傷軸承。經幾年的實際使用，可提高工效數倍，保證了軸承、電機的使用壽命。

　　小結：滾動軸承是比較精密的部件，只有正確安裝，才能保證使用壽命。本文介紹的軸承沖筒加工簡單、使用方便，可提高工作效率數倍，不僅適合電動機用滾動軸承的安裝，也適合其他設備用滾動軸承的安裝。望同行朋友試用，並提出寶貴的意見。

引擎電焊機-建設工程中電焊機的安全使用規定有哪些？

　　1、根據施工需要，電焊機宜按TIG焊機 區域或焊接護具標高層集中設置，並應編CO2焊機號。

　　2、布置在室外的電焊機應設置在幹燥場所，並應設棚引擎電焊機遮蔽。

　　3、電焊機的外殼應可靠接地，不得多台串半自動電焊機聯接地。

　　4、電焊機各線卷對電焊機外殼的熱態絕緣電阻值不得點焊機小于0。4MΩ。

　　5、電焊機的裸露導電部分和轉動部分應裝安全保護罩。直流電焊機的調節器被拆下後，機殼上露出的孔洞應加設保護罩。

　　6、電焊機一次側的電源線必須絕緣良好，不得隨地拖拉，其長度不宜大于5m。

　　7、電焊機的電源開關應單獨設置。直流電焊機的電源應采用啓動器控制。

　　8、電氬焊機焊把鉗絕緣必須良電離子焊接機好。

　　9、電焊機二次側引出線宜采用橡皮絕緣銅芯軟電纜，其長度不宜大于30m。

減肥代餐-南瓜減肥餐瘦身效果超好

南瓜真是瘦身的好選擇，南瓜中富含排便順暢豐富的膳食纖維，經常吃南瓜可以防止便秘，促進宿便的排出，南瓜熱量低，飽腹感強烈，因此是減肥瘦身的好選擇，今天給大家推薦幾個南瓜瘦身食譜，讓你輕松告別脂肪。

一、薏米南瓜粥

1、原料：南瓜、薏米、大米、銀耳、枸杞、蜂蜜

2、做法：南瓜去皮洗淨切成丁備用，大米、枸杞、薏米洗淨備用，銀耳用冷水浸泡20分鍾，在鍋中加入清水，大火煮開之後放入大米和薏米，小火炖30分鍾，放入南瓜丁和小塊銀耳，繼續小減肥餐火炖15分鍾，最後放入枸杞再煮5分鍾，停火溫熱減肥代餐之後放入蜂蜜調味即可。

二、新鮮南瓜燴蠶豆

1、原料：南瓜、鮮蠶豆、鮮香菇、醬油、食鹽、水澱粉

2、做法：南瓜去皮，去芯備用，鮮香菇放入淡鹽水中浸泡10分鍾後洗淨去除水分，切成丁，新鮮蠶豆去皮洗淨備用纖維減重，在七成熱的油鍋中放入南瓜丁、蠶豆和香菇丁翻炒2分鍾，放入醬油、食鹽、糖、少量的水炒勻之後，蓋蓋兒大火清除宿便煮3分鍾，最後勾芡就可以出鍋了。要注意蠶豆一定要煮熟，以免出現身體不適。

三、南瓜洋蔥羹

1、原料：小南瓜、去水腫牛奶、洋蔥、枸杞、白胡椒粉、食鹽、油

2、做法：南瓜去皮去瓤切成片，洋蔥去皮切成粒，在熱油鍋中炒香洋蔥，放入南瓜片炒3奇亞籽減肥分鍾，南瓜表面變色之後加入涼水的大火煮開，改小火煮10分鍾，南瓜完全熟透之後加入牛奶和枸杞，加入鹽和白胡椒粉調味，小火慢炖5分鍾，停火靜置5分鍾，溫熱的時候倒入攪拌機中打成羹。

台中機械加工-數控銑床的加工工序形式有哪幾種

數控銑床是在一般銑床CNC搪床加工的基礎上發展起來的，兩者的加工工藝基本相同，結構也有些相似。數控銑削加工除了具有普通銑床加工的特點外，還有自身的優勢，我們根據數控銑床的加工特點，來分台中機械加工析加工工序的3形式。

1、根據裝夾定位劃分工序。這種方法一般適用于加工內容不多的工件，主要是將加工部位分爲幾個部分，每道工序加工其中一部分。如數控CNC銑床加工銑加工外形時，以內腔夾緊加工內腔時，以外形夾緊。

2、以粗、精加工劃分工序。對易産生加工變形的數控銑零件，考慮到工件的加工精度，變形等因素，可按粗、精加工分開的原則來劃分工序，即先粗後精。

3、爲了減少換刀次數的行程，可以采取刀具集中的原則進行劃分工序。

在工序的劃分中，要根據工件的結構要求、工件的安裝方式、工件的加工工藝性、數控銑的性能以及工廠生産組織與管理等因素靈活掌握，力求合理。目前數控銑的加工已經與計算機有機結合在一起，是現代先進的制造技術工藝，能預先精確估計控制台中CNC加工信息，易于實現加工信息的標龍門加工准化。

touch screen monitor-Wireless Industrial Joystick

A joystick is anIndustrial monitor input device that consists of a stick that pivots on a base and reports its angle or direction to the device it is controlling。 They act as a €control column´ to control a system as well as a machine。 They often have many supplementary switches in them to control the other aspects of the machines。digital signage Generally they are controlled by the remote control technology and are mostly used these days。

JoysticksFanless pc are often used in industrial sectors to control machines such as cranes， trucks， and many other gigantic machines。 By using the wireless industrial technology， nowadays， the manufacturers are designing some unique industrial radio joysticks for the engineering industryAll in one computer。 These wireless industrial joysticks are used mainly for gigantic machines that require interference free operation。

Depending on thesunlight readable requirement and purposetouch screen monitor， the joystick may vary from each other。 However the main technology used for it， is the same。Industrial pc These industrial joysticks are mainly developed for industrial applications requiring up to twelve radio remote control functions。 They are even made with pressure sensitive devices that provide variable speed control of hydraulic operations。 The high/low range selector of these devices allowsBox PC for precision movement in tight quarters。

Another chief aspect of the wireless industrial joysticks is that they include the split signal capability which allows combined boom movements like €up and sideways´ or €extend and winch down´。panel PC You will find a trigger mountedVideo wall €on´ switch in the joystick that must be squeezed before boom functions work。

These industrial joysticks are made with high standard of radio remote control technology and they are designed for multi-directional industrial purposes。 When used they will provide the reliability， selection， andIP66 quality you need。 You may have any type of industrial applications； you will also find suitable joysticks for yourself。 Sometimes， the industrial joysticks may include some optional features like micro switches， one， two， and three-axis versions， friction hold devices， and dust-proof rubber covers。

The industrial joysticks can be mounted externally on your gigantic machines。 They are constructed with IP67 rated， impact resistant polycarbonate material。 The rugged polycarbonate enclosure ensures the safety and durability of the products。 These devices also include an internal antenna to receive the signal。 Optional coax and remote mount antenna are also available。

These devices are pre-wired wiring connections in order to fit with OEM requirements。 Quick connection plug is also available for additional requirement。 They are designed with powerful transmitter having 100mw transmitter output。 They can work with 902-928 MH frequency operation。 Normally they can catch or send signals up to 2000 feet distance。 You can also add external receiver antenna to get the highest range。

Plastic bearing-How to Clean Skate Bearings

Skate bearings gslide bearingenerally last a long time and require little maintenance。 If you ride them in the rain or through some puddles thenPlastic bearing it might be a good idea afterwards to give them a strip and regrease just to stop them rusting too fast。 Many people keep an old knackered set of bearings specifically for sliding and skating in the rain。 Saves you rusting up those brand new bearings you just got for your speed board！

Take the nut off the axle and slide the wheel along the axle so that the innermost bearing is just on the edge of the axle。 Using the same kind of motion as you would to open a bottle of beer， prise the bearing out of the wheel。 Flip the wheel over and repeat。

Once you€¬€ve got your bearings out of your wheels， you need to get inside the cartridges。 If you€¬€re lucky your bearings will only have a single shield， but most likely you€¬€ll have to take one of the shields off so you can get to the balls and cage。 With a rubber shielded bearing this is easy - just prize one shield off with a small screwdriver。 Unless you are VERY careful you€¬€re probably going to damage the shield taking it off - but that€¬€s OK， you only really need one on each bearing。 Metal-shielded bearings have a €¬…€C€¬ clip round the outside of the race that you€¬€ll need to take off。 On some bearings it is possible to remove the balls and cage from the race entirely for individual cleaning - but unless you really have nothing better to do it´s not really worth it。

Next you need to get all the old crap and grease out of your bearing races。 Avoid using WD40 - the best bet is to use methylated spirit or just soak the bearings in some solvent or alcohol。 Lemon juice works well too！ Soak your bearings in your chosen liquid try putting the bearings in a jam jar and shake the bejeezus out of them for about 2 minutes， then rinse them with some more clean solvent。

Regreasing:

Dry them off (hair dryers are handy here) relube them with a touch of oil or grease。 You don€¬€t need much lube in there so don€¬€t go too crazy！ The thinner your lube， the faster your bearings will spin， but the more prone to destruction they will be。 Oil makes your bearings mega fast， but if any crap at all gets in there your bearings will be toast。 Plus oil has a nasty tendency to spin out of the bearing at speed leaving your bearings without any lubricant， which leads to overheating bearings and melting wheels。 Not cool€¬¦ but maybe worth loOKing at if you really like cleaning bearings。 On the other end of the spectrum is medium grease like the white stuff you can get at a bike shop。 If you use this your bearings will be much more resistant to crap and should last a lot longer， especially if you ride in the rain a lot - but the flip side is that they€¬€ll spin slower。 Really your best bet is a skateboard bearing specific lubes like Powell Speed cream or similar light grease。

sintered metal-Scientists Build a Low-Cost

OK， so maybe youpowder metal aren´t interested in making your own toys， cellphone cases， or glow-in-the-dark Christmas decorations。 How about a brake drum?
Until now， 3D printing has been a polymer affair， with most people in the maker community using the machines to make all manner of plastic consumer goods， from tent stakes to chess sets。 A new low-cost 3D printer developed by Michigan Technological University´s Joshua Pearce and his team could add hammers to that list。 The detailed plans， software and firmware are all freely available and open-source， meaning anyone can use them to make their own metal 3D printer。

Pearce is the first to admit that his new printer is a work in progress。 So far， the products he and his team have produced are no more intricate than a sprocket。sintered metal But that´s because the technology is so raw。 "Similar to the incredible churn in innovation witnessed with open-sourcing of the first RepRap plastic 3D printers， I anticipate rapid progress when the maker community gets their hands on it，" says Pearce， an associate professor of materials science and engineering/electrical and computer engineering。 "Within a month， somebody will make one that´s better than ours， I guarantee it。"

Using under $1，500 worth of materials， including a small commercial MIG welder and an open-source microcontroller， Pearce´s team built a 3D metal printer than can lay down thin layers of steel to form complex geometric objects。 Commercial metal printers are available， but they cost over half a million dollars。
His make-it-yourself metal printer is less expensive than off-the-shelf commercial plastic 3D printers and is affordable enough for home use， he said。 However， because of safety concerns， Pearce suggests that for now it would be better off in the hands of a shop， garage or skilled DIYer，powder metal since it requires more safety gear and fire protection equipment than the typical plastic 3D printer。

While metal 3D printing opens new vistas， it also raises anew the specter of homemade firearms。 Some people have already made guns with both commercial metal and plastic 3D printers， with mixed results。 While Pearce admits to some sleepless nights as they developed the metal printer， he also believes that the good to come from all types of distributed manufacturing with 3D printing will far outweigh the dangers。

In previous work， his group has already shown that making products at home with a 3D printer is cheaper for the average American and that printing goods at home is greener than buying commercial goods。

In particular， expanded 3D printing would benefit people in the developing world， who have limited access to manufactured goods， and researchers， who can radically cut costs of scientific equipment to further their science， Pearce said。 "Small and medium-sized enterprises would be able to build parts and equipment quickly and easily using downloadable， free and open-source designs， which could revolutionize the economy for the benefit of the many。"

"I really don´t know if we are mature enough to handle it，" he added cautiously， "but I think that with open-source approach， we are within reach of a Star Trek-like， post-scarcity society， in which ´replicators´ can create a vast array of objects on demand， resulting in wealth for everyone at very little cost。 Pretty soon， we´ll be able to make almost anything。"

Solid Concepts 3D prints world´s first metal gun
3D printing company Solid Concepts has announced that it has 3D printed the world´s first metal gun€"other guns printed using 3D printers have been made of plastic。 Representatives for Solid Concepts say they created the gun to demonstrate how strong and accurate products made using 3D printing technology can be。

Over the past year， reports of guns being printed using relatively inexpensive 3D printers have raised concerns regarding a new way for people to gain access to weapons。 Such concerns have died down， however， as newer reports have pointed out the weaknesses of plastic guns€"they don´t last more than one or two firings。 That´s not the case with the gun printed by Solid Concepts€"engineers there fired their weapon over 50 times， with no apparent problems。

Printing with metal instead of plastic requires a whole new level of printer€"one so expensive that most could not afford to buy or even rent one， thus， news of a printed metal gun isn´t like to spark much if any controversy。 It does however， as the company that printed the gun points out， highlight just how far 3D printing has come。 In this case， the printer uses what is known as a direct metal laser sintering (DMLS) process€"metal powder is heated to create a type of ink that can be used for printing。 In the past， the process has been used to create surgical implant and aerospace parts。 The newly printed gun， created using blueprints of a real handgun formerly used by the US military， was made by printing almost all of the parts€"it was finished by assembling by hand。 No machining was necessary， just some hand tooling。 The process even included rifling (grooves inside the barrel that cause the bullet to spin as it´s ejectedsintered metal) to ensure accuracy。

Reps for Solid Concepts also note that printing their gun was completely legal€"the company holds a Federal Firearms License。 They add that the metal in their gun has less porosity than poured metal and allows for more complexity than metal that is cut using lasers。 They hope to begin selling hard-to-find gun parts to manufacturers in the very near future。