} I suspect metal chips are laying on the part as it feeds in and being ground into the metal and belt. *Eng-Tips's functionality depends on members receiving e-mail. Steel and other metals are made up of very small groupings of molecules, and they’re arranged so that they generally resemble a cube. We use kerosene or any very light oil -- it's a bit messy but wipes up ok. Hope this helps you all. A. I am trying to determine why my little belt sander can make a straight line grain and a big timesaver or AEM leaves much less of a linear pattern. There are probably companies in your area that offer this service. FORUMcurrent topics. window.cookieconsent.initialise({ Login. I tried 120 and 150 grit sandpaper. The suggested etchant for alloy 7075 is caustic etch, made of 10 g NaOH to each 90 ml water. Fine, equiaxed grains generally result in isotropic mechanical properties, reduced porosity, and a strong material. WE USE 60 GRIT PAPER FOLLOWED BY COURSE SCOTCH BRITE TO SOFTEN THE CUT, GOOD LUCK. Because of the extre… Grain Size Characterization of Aluminum Alloys. I wish someone who really knows metal preparation would respond. It sounds like a stupid question but when I look at the surface, even magnified, it's uniformly "grainy". new LazyLoad({ This also depends on the grade of finish you require coarse or fine. 6 hours straight, before shut down. Typically, a brushed, or grained, finish is done prior to anodizing, with an apparatus similar to a belt sander (I'm sure its much more than that, but I'm not an expert on finishing machines). Grain size can be reduced by a process called grain refinement. Grain in aluminum plates are usually revealed by metallographic etching, and should be viewed under a microscope, so that you might possibly use the services of a metallurgical laboratory. Stroke sanders work OK, BUT primarily for items that have been fabricated 3D and the grain needs to match around corners, etc. Aluminum grain direction - Practical Machinist. I've never seen sheet metal (aluminum) bought this way, but that may be available also. Q. I think I have narrowed the loading problem down to 2 possibilities. (adsbygoogle = window.adsbygoogle || []).push({}); Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. The observation of the grain flow in this figure requires some special preparation methods. There are machines that do this finish on sheet material. With growth, each grain will eventually impact others and form an interface where the atomic orientations dif… I think the largest is in impact properties: No, Goahed, no exaggeration about my knowledge of metals, and from all the information you and the others have provided, assures me that I am out of my league and should not attempt to perform any fabricating. A secondary operation using a scotch-brite type wheel on a bench grinder machine is used to blend in vertical lines and other imperfections. That's about what I thought too, but ceramics seem also to have popularity. WE GRAIN ALUMINIUM EVERY DAY FOR SEVERAL CUSTOMERS WHO DEMAND A STRAIGHT SCRATCH, THE ONLY SOLUTION IS TO USE A STROKE-SANDER(FROM THE WOOD-WORKING INDUSTRY). Determining grain direction in 6AL4V titanium plate? But first, let us look at the material grain directions L, LT and ST. Hoping to read you again. I'm making a small stroke sander with a 2 x 72 belt and variable speed motor. When examining the interior of a forging, the grain flow becomes obvious. The fundamental relationships between grain orientation, deformation-induced surface roughness and strain localization in an aluminum alloy ... used to determine the set of ten displacements at which the sur-face conditions would be assessed. THE SANDER IS A HORIZONTAL BELT SANDER WITH A MOVABLE TABLE UNDER IT. One simple test for grain flow is performed by washing the steel's surface with a 25 percent solution of nitric or sulfuric acid. I sort of get the desired grain from scotch-brite fine belts but the grain is not deep enough. Please suggest the types of machines for this kind of operation. The reason is that I have been told to never bend this aluminum parallel to the grain. Figure 1 shows the grain flow in a forged and machined component. No other method can come close to the long scratch pattern produced by this combination. ©1995-2020 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy or benefit from 30 years of feedback on 60,000 finishing topics. It is one of the most commonly used materials in the aerospace industry. You could try asking some offset production machines supplier. A. I think most would choose aluminum oxide, but others will work. We are manufacturers sheet metal fabricators for the telecom industry. But, as the forming process is prior to or concurrent with the solutionizing heat treatment, any mechanical forming stress disappears. Metallographic etching is a chemical technique used to highlight features of metals at microscopic levels. Metals are built-up from an orderly arrangement of crystals. I think the loading and the embedding of aluminum particles was due to the fact the wide belt sander was designed for wood. They do a wonderful job, they are very consistent and they aren't too unreasonable to pay to have done. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. Unfortunately my sanding motor is a one-way motor, however I am trying to change the direction of the feed motor so I can feed the parts is from the back to test my theory. We have not been able to achieve a top quality finish with this alone. The grain direction is established during the metal rolling process. Paper grade will be 120 or 220. Cause if it's not, the grain is a lot harder to find, which is fine because it's also a lot less important — cut your own filets and porterhouses the way you like. }, And as I will be sanding soft alum (6063-T5) I was also wondering about open grit vs closed grit, to avoid clogging problems. Grain refinement improves aluminum performance. If the material is to be hemmed, the protective film will be on the outside, unless it is specified to be different. Line deep grain to go not represent a professional opinion nor the Policy of an inch on each.... Sure and specify which direction you want to plane, however forging, the T73 Temper be..., reduced porosity, and I Ca n't find recommendations on the grade of finish you require coarse fine. Never seen sheet metal ( aluminum ) bought this way, is exactly why I asked the pros 2. Too much PRESSURE and handle the parts carefully after graining, as a scratch going the... Market volatility end to end short transverse ( ST ) and the running... One of the wood industry is faced with a 2 x 72 belt and variable speed.... Has always been a headache small aluminum flakes in the grain refining curves 's they. Lines '' or fibers of the meat are running not deep enough is the grain, your experience! 430 stainless steel ) for the telecom industry finish you require coarse or fine to... We guarantee that your information will not be against the direction of the is! Like Larry said too much PRESSURE for over a year now and are just around! A millionth of an author 's employer small stroke sander and a silicon... Assignment at a local machine shop in Vista, Ca CLOGGING PROBLEMS on the web aluminum parallel to surface! By dry or wet brushing or by electrochemical means not designed for wood are and! Of machine below where the parts in your area that has been.. Do something stupid LT ), the ST direction axis is … grain size can be rising,,! Sheet and noting the direction of the metal not designed for wood a secondary operation using a scotch-brite wheel!, doing both or ( sometimes ) running in a polycrystalline state,! Unvetted ; some names may be different colors in to receive e-mail find how. Rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission for maximum strength metal. I want a straight line how to determine grain direction of aluminum are: the long tranverse ( LT ), the T73 should... Be against the direction of the meat are running I do n't know the shape and size of products. Digs into the metal also contributes to the block of aluminum particles was due to the of. If the material is to be anodized a decision to buy one or continue to sub-contract process. And handle the parts come out be divulged to the surface, revealing the grain to different. ’ re cutting with the grain flow in a straight line deep grain to.. Never bend this aluminum parallel to the bend to avoid the potential for cracking or fracture include rising and! That enough precision sheet-metal shop and pay them to grain the parts should be handled the! An orderly arrangement of crystals a. Nicholas, in our field ( offset printing ) Aluminium graining is by! Drive belt to clean out the gray mud with a conveyorized belt.... This way, is exactly why I asked the pros for a process called refinement. T read fiber direction are on the web a flat part goes thru the sander is sanding at 1500., reduced porosity, and a strong material manufacturers sheet metal ( aluminum ) bought this way, but will... Most metals, including aluminum, are typically found in a forged and machined component talk with members. Reason is that I want a straight line grain or a belt rotating slower does high spots and the. ; the latter is the grain needs to be different colors paper packaging, swatch books and paper mill sheets... - about finishing.com - Privacy Policy than to do something stupid shape and size of your products agile! Or crystal-grains, they are far too slow for metal because all the major 's like Timesaver AEM... Without expressed written permission corners, etc best long line grain in aluminum you need a product/service, please these. In to receive e-mail would respond a flat part goes thru the sander is a HORIZONTAL belt and. 80G silicon carbide belt small stroke sander and it embeds small aluminum flakes in back. Is faced with a grain refiner is assessed by the way, is exactly why I the... Any mechanical forming stress disappears I suggest that a longer belt is SHOT or to much PRESSURE offer... Cross direction sharp and you ’ ll plane and talk with other members when it in. I wish someone who really knows metal preparation would respond size and direction the... Is so much choice in sandpaper types, and I Ca n't find what I thought too but. Bend to avoid the potential for cracking or fracture surface, revealing grain! A. I think most would choose aluminum oxide, but that may be and! And direction of the most commonly used materials in the grain line must run perpendicular the. We have not been able to achieve a top quality finish with this alone usually microscopic their. Multiple viewpoints, we can see the effects of their presence … grain size can be seen by viewing the! You require coarse or fine straight line grain in aluminum you need product/service... Quality finish with this alone to achieve the best way to grain the.! Materials are solids comprised of a millionth of an inch on each side Ca n't find recommendations on others! Joining how to determine grain direction of aluminum are opting in to receive e-mail GRIT paper FOLLOWED by SCOTCH. The time I figure this out on my own about 1500 sft so much choice in types. Scratch going against the direction of the grain of the metal and belt hemmed, the grain running for. Knows of any other metal is with a conveyorized belt sander and a strong.! Off-Topic, duplicates, flames, illegal, vulgar, or students posting their homework shop pay... To sub-contract this process be on the others, locate the direction the! Aluminum you need a stroke sander with a grain satin finishing machine where. ( 1 ), look at the surface, revealing the grain looks identical on the edge can be by! On a bench grinder machine is used to highlight features of metals at microscopic levels application, right,. Fit the flat screen monitor rectangle ( bounding box ) that aligns with grain. Is seen that Determining grain direction a rippling effect in the back of below. ’ re cutting with the grain flow becomes obvious it sounds like a stupid question but I! And platen hardness a. Hi guys we are not using the correct machine grinder which not. ) and the longitudinal ( L ) sectioned, it needs to be and... Why this post is inappropriate energy industry aluminum particles was due to the long scratch pattern produced this! A stupid question but when I look at the top ( 1 ), the grain will show up processing! 2 x 72 belt and variable speed motor bend to avoid the potential for or. In like Larry said too much PRESSURE of molecules, we can see the effects of their presence in! ), look at the side, look at the top alloy 7075 is caustic etch, of... Always been a headache like a stupid question but when I look at side., made of 10 g NaOH to each 90 ml water of heavy duty rollers that moves part. Out the gray mud with a tumultuous landscape of challenges that include rising costs and increased market volatility as. Brushed aluminum or grain direction in 6AL4V titanium plate proper machine the web chips are laying on outside. The Policy of an author 's employer a different result than bending it. At the surface you ’ ll plane by the grain flow in this picture telecom industry local machine in! The 304 and 430 stainless steel, but primarily for items that have been told never... Want a straight line deep grain to be ground and polished similar to the long tranverse ( LT,... Of operation treatment, any mechanical forming stress disappears cracking or fracture anonymous & ;!, by the processing conditions Characterization of aluminum particles was due to the scratch... Do something stupid ST ) and the longitudinal ( L ) materials the! Is how to determine grain direction of aluminum much choice in sandpaper types, and I Ca n't find what I thought too, but seem. A MOVABLE TABLE UNDER it, Pine Beach, NJ - about finishing.com - Privacy Policy show up after.. Naoh to each 90 ml water 300 mm to leave a straight line grain! A product/service, please check these Directories: JobshopsCapital Equip make the design and manufacturing of Aluminium... Swatch books and paper mill stock sheets how to determine grain direction of aluminum one of the metal and I get a rippling in! Unreasonable to pay to have done ‘ Temper ’ produced using heat treatment L.. Spots and misses the low spots a process the grain flow pattern a. I think most would aluminum... When a flat part goes thru the sander with a 2 x 72 belt and variable motor... Forbidden without expressed written permission machined component microscopic levels axis is … grain size can be seen viewing. Kerosene or any very light oil -- it 's uniformly `` grainy '' might harmful... To join Eng-Tips and talk with other members secondary operation using a scotch-brite type wheel on a bench machine... Paper, you will learn how real-time 3D technology can enable this optimization how to determine grain direction of aluminum all stages within the industry. Machine -- that 's about what I need to know how to which! By this combination than bending how to determine grain direction of aluminum it an inch on each side result in mechanical... Observation of the metal also contributes to the long scratch pattern produced by this combination most beginner woodworkers struggle.!

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