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Posts by skip
Page [ 1 of 2 ] Posts by skip [ 1 to 25 of 44 ]
Re: Scale left from lazer cutting [ Started by tdeplating in Zinc Plating : 6 replies ]
Cleaning the black iron [stainless steal] work chemically will usually be enhanced with the addition of heat and abrasion. Manual scrub, a wire brush by a mechanical moving arm or a moving table under a stationary brush. A sheet flipper can be used to clean the other side if the parts are too large to easily handle.Palmer Johnson Yachts at one time laser cut it's aluminum parts but cleaning both small and large [nearly full sheets] is found to be impossible in a timely fashion using man power. Aluminum needs to be absolutely clean before welding. Any dirt or smut detected in the welded hull plates that shows up on the X-Ray will have to be cut out and redone. Otherwise Lloyd's of London will not insure the hull. The laser was replaced by a CNC high speed bit cutter, air cooled, and that blows the chips all over the sheet despite having …
Re: Anodize chipping / flaking after pressure test [ Started by Joe G. in Anodizing : 3 replies ]
"We had some tubes and endcaps (7075) hard anodized and sealed. The next day we sent the parts out for pressure test. The test put the parts under the same pressure as being underwater at 6000 meters (8700 psi). When the parts were taken apart the anodize was missing on the inside of the face o-ring. Almost as if the anodize had flaked off. Any ideas? Did we send the parts to pressure test too soon?" Let me first preface my remarks by saying I have no idea what I'm talking about. Are these those ocean bottom seismometer capsules? Just guessing. Some 6000 meters [8700 psi] is quit a squeeze and maybe compacting the T-6 Aluminum 7075 hard anodized tubes to a point where the hard anodized compresses along with the aluminum tube, lets say, "By quit a bit" whatever that means and when relieved of pressure and allowed to expand, the tube expands and the hard anod …
Re: Paint Problems on plastic housing [ Started by challenger150 in General Discussion : 8 replies ]
Travis Has A Handle on MEK Test Rubs. I thought I would cut and copy his words here as they apply very well. skip. The actual SOLVENT RUB MEK TEST that is the industry standard can be obtained through the Powder Coating Institute Handbook. Book is a wealth of knowledge. It is quite a detailed test description that I would not want to list out here. You can access them online at www.powdercoating.org. Now, for our method of onsite testing, I simply take a bottle of MEK and dip a q-tip into into it. I shake off the excess and then with one hand I hold the q-tip and without much pressure (as if I was writing with a felt tip pen) I go back and forth over a 1 inch area approx 5-10 times. What I look for is a dramatic lift of pigment to the q-tip or a dramatic drop in gloss. These can be indicators that the part is under cured. That said, I want to make it clear that so …
Re: Cut costs of high volume packaging [ Started by Anne Wilde in Article Submissions : 3 replies ]
"Keronite surface treatment technology enables volume manufacturers of plastic packaging to extend the lifetime of aluminium moulds and improve moulding characteristics." I'm thinking that all the bad press over 'plastic' bottles from the medical corner will eventually eliminate at least half of these items through the heavy hand of the Obama administration. That aside, limiting the ware of tooling is a significant. So does anyone feel this will lower the cost of producing plastic bottles to the ultimate consummer? You and I. Not that Keronite is not a bad idea, I'm all for it. skip.
Re: E-Coating and Powder Coating Stripping applications [ Started by MilesChemicalSolutions in Article Submissions : 3 replies ]
Lots of ways to remove overspray. I favor burn-offs. Both conveyorized and batch. I favor batch style because of the slow ramp up of temperature to about 750 deg F. Not one thousand, and then the slow ramp down of temperature toward ambient. The criteria is "at what temperature do the binders in the cured overspray paint break down?" And how much time is required to create this binder destruct? I don't know but assume that many low temperature powder coat binders probably break down at a much lower temperature then the 750 deg F. suggested above. Maybe 400 deg F.? In batch burn-off [batch bake-off] ovens the primary burner capacity is rarely greater then a maximum of 400,000 btu. And usually this MIDCO packaged burner that can be offered with …
Re: heatable food safe stainless steel paint [ Started by don nelsen in General Discussion : 4 replies ]
Don nelsen has changed his post to zero in on a food grade high heat colored paint for stainless steel. The logo discussion was dropped. Again I look at the 'frit' line of coatings. They are food grade as far as I know. I have no knowledge of a high temperature food grade paint, either powder or liquids that can be applied to stainless steel and stay on the stainless steel for a considerable amount of time. In the three years I have ingested powder paint pulling a trigger on the gun, I can truly say that this activity has not, at all, lkjbvgiuardegdjhweli;gjv effected me. Much. LOL.! skip.
Re: Questions relating to finishing processes [ Started by maja in General Discussion : 2 replies ]
Sure any 'finishing process' that cleans oils and soils off the substrate, be it black iron [steel], stainless steel, alloys, aluminum w/conversion[?] can be used...BUT the results desired, that is, a way to make the paint stick to the substrate may not be achieved in the long run. Specific substrate require specific pre-treatments. Generally speaking. Note that a phosphate applied to stainless steel and some alloys is not going to do much to make paint stick to this substrate. Other pretreatments are better for stainless steel. Two questions that need to be answered first. Painting the work [finishing the substrate]...lets say it is black iron [mild steel]. #1~For a 'point-of-purchase' display. You don't care if the paint falls off after the item is sold. After market automotive shock absorbers f …
Re: Help with coverage issues [ Started by joekin0000 in Powder Coating : 2 replies ]
Looking at those picture pretty hard and I don't see a lot of evidence of any Iron Phosphate pretreatment. No dull grey matt finish. Should be about 130 mg per sq ft for iron or 300 mg for zinc phosphate. But to address the question of applying an epoxy/polyester UV resistant powder into the 'cracks and crevasses' of this weldment lets consider the [sp?] Faraday Cage Effect. Physics tells us the electricity follows the path of least resistance. Reaching into a corner is not the shortest path. The electrostatic charged powder paint is not going to reach the far corner when another surface is nearer. The powder from the gun follows the electricity. The straightest line. Charged powder leaves the powder gun and is attracted to the closest substrate. Not the corner. Two cures: 1~Turn the power pack 'OFF' and use the powder gun …
Re: deionized rinses [ Started by heyman65 in General Discussion : 2 replies ]
Water is the ultimate solvent. Given enough time it'll dissolve anything. D.I. water or Reverse Osmosis? Is R.O. Water too 'hungry' and promotes 'eating metal' say on grey metal castings? Just always wondered. Not trying to change the subject. I heard a ball park price to make RO is about $3/100 U.S. gallons. skip.
Re: heatable food safe stainless steel paint [ Started by don nelsen in General Discussion : 4 replies ]
Hello Mr. Nelsen, "a high temperature heatable logo able to withstand the heat in everyday use and applied to 304 stainless steel." So question? How hot is every day use to a cookware guy? My wife's oven does 550 deg F. and the surface units glow red hot. Hot paint = Automotive header coatings, or powder coating in 'Frit' similar to porcelain. Think Webber Kettle's out door charcoal grills made in Palatine, Illinois. My first thought before I finished reading this post was laser etching similar to "Easy Read Socket Sets" sold under the name of Sears/Craftsman. Looks great! Grey on silver chrome plating. Looks 'Logo like' as the fonts and boarders on each socket share a similar family style. If it's not laser I don't know what it is. This 'size identification logo' has not burned off any of my plated steel sockets while heating nuts on studs with a oxy-acet torch when freei …
Re: Paint Problems on plastic housing [ Started by challenger150 in General Discussion : 8 replies ]
Hey Challenger 150 - I'm wondering if you gave up - or fixed the problem? ~skip
Re: Cleaning and passivating stainless steel [ Started by apurdey in General Discussion : 12 replies ]
Use to be able to buy steam coils for steam heated washers in 'elecrtopolished' finish. Delays cleaning the phosphate crud off the coils, a little bit. A small package steam boiler is about as cheap a way to heat a tank of solution on conveyorized washers. And even some dry-off ovens. Eliminates condonsation from burning gas/oil. Lowers exhaust requirements necessary to keep the oven sweet. Makes a quiet piece of equipment as well. Sometimes that is really important. skip.
Re: hot salt fog cabinet [ Started by chrissyboy in General Discussion : 7 replies ]
Boy Chris we do have a lot of interest from overseas. Like the last three replys answered from skippy were from overseas... What is going on? Not much in this Country to be sure. I figured once a month was good enough for a test panel. About as often as the washer is dumped, cleaned, and recharged. Bill's commit is a good one though. After all just what is a washer? It is simply a sewer that holds what is put in till it's dumped and washed out. Even though the dump schedule can be amended with filtering and water treatments. skip.
Re: hot salt fog cabinet [ Started by chrissyboy in General Discussion : 7 replies ]
Maybe your coatings supplier will salt spray test for you. Why duplicate efforts? Suppler may own a lab. All the benefits, none of the work. You can supply your own pre-treated substrate panels for supplier to test. Test yours against his. skip.
Re: Black Anodizing ??? [ Started by Belewsboy in Anodizing : 5 replies ]
Belewsboy asks, "Can someone tell me what a "MiniMag" flashlite is finished with?" I don't know but it sure looks like a great durable finish. After years of crawling around in aluminum boat hulls with my red finished MiniMag flash light in a belt holster, the finish is just now beginning to ware-off down to the shiny aluminum substrate. I say ware-off only because it is not flaking off, peeling off, chipping off or shows any exact mil thickness change between coating and bare substrate. Seems to be just a gentle smooth abraded and thinning of this mystery finish on the high wear areas. I like it! The Texas outfit that manufactures the larger MagLite flashlights [I don't know if it's the same outfit that makes MiniMags] have a facilit …
Re: Paint Problems on plastic housing [ Started by challenger150 in General Discussion : 8 replies ]
challenger150. Had not expected to hear from you this soon. I assumed that you were an American working within one of our 50 states. I shall redouble my efforts to write in proper English. I shall not be so 'flip' by using phrases like 'IMHO'. Challenger150 says, "I don't know what means: 100 wipe MEK, IMHO, 'H.O', 'N', gauge, chewy, brittle... I'm really sorry but when I was studying English, my main points were business terminology, not technical." Those abbreviations are--> MEK is methyl ethyl ketone. MEK softens and dissolves almost anything. More so if some of the solvents in the paint have not been driven out during the forced cure in an oven or over time at ambient temperatures through evaporation when the paint/coating is drying. Uncured coating are soft and I was thinking that your packaging was i …
Re: Paint Problems on plastic housing [ Started by challenger150 in General Discussion : 8 replies ]
challenger150 says "the paint has markings of foam which was used to protect this casing and the paint itself." And asks; How can I package the product better? First thing I thought was; Is all the coating atop the ABS plastic not fully cured or finished drying." Do we fail a 100 wipe MEK? Sure that will happen. How do we check for cure on ABS coated substrates having 4 layers of paint, 2 layers of lacquering, with sanding, and polishing between layers? Does not sound like an adhesion problem. So the above may not have much to do with marks in the coating during shipping. I don't think the ABS plastic has much to do with the problem either. Oh Snap! Why not do 4 layers of paint, 2 layers of lacquering, with sanding, and polishing and waxing between layers on a steel, flexable plastics, wood, …
Re: Zinc gasing thru powder coating. [ Started by tdeplating in Powder Coating : 3 replies ]
"We have zinc plated parts then sent to powder coat." De-gas first, then plate, then p-coat. Out gas of zinc parts when P-Coating is not that unusual me thinks. Let me say this a couple of ways. I'm thinking Ertl Toy After wash, either dry at a temperature about 100 deg F higher then the cure oven temperature used for the powder coat cure when a batch oven set-up is used. One batch oven. Two batch's. Two temperatures. Substrate must be raised to a hotter temp clean through. Then coated and cured at a lower temp. Might include a function of time. Don't p-coat hot unless your looking for mil build.
Re: The good and the bad about recycled aluminum [ Started by AluConsult in Article Submissions : 2 replies ]
First let me preface my random commits by saying; For me no global warming is possible. Only two sources of energy on earth are the sun and nuclear. Say just for giggles one huge solar panel was needed to power the U.S. This panel would need to cover all of Spain. Turning all of Spain under this solar panel into a permafrost, endless and lifeless wasteland. Of course another solar panel the same size would be needed 180 degrees around the globe for power when night befalls Spain. Plus long electrical extension cords of fiber optics. "Ain't gonna happen." California is a desert, always was, always will be. Want water? Build nuclear power plants to power 100+ foot~head pumps and squeeze the ocean through some membranes for fresh water. And since the land West of the Mississippi River is up hill from the land East of the Mississippi River not enough electric power can be found to pump …
Topic: Batch System Liquid Waste Reduction First. [ Started by skip in Waste Water Treatment : 0 replies ]
Batch System; Liquid Waste Reduction First. The Idea and Question about waste treatment, either batch or flow through is... Take the liquid waste, reduce it's volume in gallonage into two types of waste. A hazardous liquid and a non hazardous dry waste. Maybe like a filter press cake. I learned of a company in my town that manufactures waste dryers or more properable called liquid reducers where a 'hazardous liquid' like substance normally going to a 'hazardous land' fill can be pumped in, dried, augured out as a material dry enough to go to 'nonhazardous land fill'. Technically I don't know much more then this. I have seen these being built, videos of these working, and have seen the company literature on the 'inner workings'. I'm guessing a machine like this is NOT meant for metals separ …
Re: Hanging Fixtures for Structural Steel [ Started by Emrah in Requests & Feedback : 6 replies ]
Emrah Well it looks like this project is well in hand. So how are things in Turkey? Sounds like buildings are being erected and that is providing an opportunity for this producer to get busy fabricating and painting building steel. That is a good thing. I wish I had an answer for rack marks but I don't other than a dip process with an electrostatic de~tearing to knock away the drip marks as the work exits a dip tank over the drip pans...that is a whole different can of worms. Well as you know unemployment is still very high in the states and small business as well as large business is pretty much sitting on their collective wallets. People are just not spending money. Uncertainty is pretty certain. People are scared and things just became worst with this expensive health care bill that no one can figure out how to pay for. …
Re: Hanging Fixtures for Structural Steel [ Started by Emrah in Requests & Feedback : 6 replies ]
Emrah; Hanging work this heavy and this long, and unknown width or height, either one at a time or in multiples is usually a tough thing to do. If you screw up your going to kill somebody. So be careful. Cover your butt. If you do this you'll have to negativity sell the idea. Me...I'd paint these on the building floor. But... You have to consider weight, and the combined weight of several works, space between so the painter can get in there to spray the work. Square footage that is being painted and is enough time allowed to cover the work.The vertical height of the work package. Can 'Joe' painter reach to the top-o-work? Is a painter's platform necessary? Is a fork lift or crane needed to load and off load the work? What about rack marks? ect. May be painting can be done with two Funac P-100 painting robots and Carol controllers and a couple of HPLV guns. A …
Re: Hanging Fixtures for Structural Steel [ Started by Emrah in Requests & Feedback : 6 replies ]
"Holy crud der batman", in Turkey? You want one size fits all work hangers? So if the work hanger is adjustable, or a siding affair what happens when the over spray paint builds up and 'gums up the works' ? And are we talking a grounded work hanger for electrostatics? Work hangers must be clean. I did the engineering and built a body carrier work hanger burn-off system for Pontiac years ago. Five pictures included. Note that the floor to heat protect the inverted power and free is not yet installed. This bake-off oven and and ash washer is on the third wood floor of the building. A slight elevation adjustment so some conveyor pieces were scabbed in. A 40 ton 30 foot + long piece on a overhead Webb Conveyor system and into a oven. How hot is the oven? How much time. How many pieces an hour? Just wondering...and what are the coating specifications? Certainly not powder I hope. …
Re: Polishing Stainless Without the EPA Possible? [ Started by Joe Diemer in Polishing : 9 replies ]
Joe Diemer, From my previous post. I don't think the EPA knows or even cares about this inhouse process used in the welding department. Hatco Foodmachine Company in Sturgeon Bay-factory/Milwaukee-office cleans weld stain and smoke from stainless steel weldments of welded cross wires and folded cornor joints to produce drip pans for food warmers with an acid compound that I have no knowledge of. But watched this being done. Using a wood tounge depressor and a wire down it's length from a transformer and buried in a piece of cotton rag...this cotton is dipped into a cap full of solution and placed on the stain. Moments later the stain is gone and the area is spounged with warm water padded dry. So dab on the acid, asap touch the stain with the wand and presto. Weld st …
Re: Solution for NSST above 240H with wearable surface [ Started by Sharon in General Discussion : 4 replies ]
Sharon; Isn't this a maritime spec. Like provided by 'Deep Blue' marine hardware and by 'Buck Marine Hardware'? I'm dumb enough to not know what a "a finish solution to meet" really means. Is this just the hardness of the stock or a coating process applied to the stock. Confused skip. I just reread all of your former posts and am really way in over my head. Hope someone can help out here. Just guessing..
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