Brake pads naturally wear out over time. Luckily, it is not as difficult to replace them as you may think. The tools that you need for this project include a lug wrench, c-clamp, adjustable or open wrench, Allen wrenches, hammer, and a bungee cord. When you jack up your car, make sure that you have it supported by blocks or jack stands. It is never safe to work on a car that is supported by a jack only. The first thing you need to do is remove the wheel. The lugs should be easy to take out, it is best to do so from the bottom up.
Next, in order to remove the brake pads you must first remove the brake caliper. The brake caliper can be located just above the lug bolts, sitting on top of the brake disc. There is a bolt that keeps the caliper in place. You can remove it easily using the suitable wrench. There are different types of bolts that could be keeping it in place, so it is a good idea to have different wrenches handy. Now you can pull the caliper off by pulling directly up. You may need to wiggle it a bit in order to loosen it. Now you can sit the caliper some place convenient, or use your bungee cord to tie it up.
Now comes the time to remove the brake pads. They should actually slide right out without giving you any trouble. Remember how they are attached though, because you will need to know this when you are installing the fresh ones. If you are driving an older vehicle, you may need to tap them with your hammer a bit to get them unstuck. There may be some small metal tabs keeping the pads in place as well. If so, make sure you hang onto them; you will need them when you put the new pads in.
Now you can easily slide your new brake pads in, using the metal tabs to keep them in place if applicable. Now with your new pads affixed, you should adjust the brake piston. This piece of equipment adjusts as your pads wear out in order to keep your brakes working efficiently. To readjust it, you need your c-clamp. Put the end of the clamp with the screw against the piston. The other end should rest behind the caliper assembly. Now just slowly tighten the clamp until the piston has moved to a point where you can insert the pads easily.
The next thing you need to do is slide the caliper assembly over your new pads. Replace the bolts. At this point, it is a good idea to push down the brake petal a few times so that you may be assured of your brake pressure. Now you can replace the wheel and the lug nuts. It is a good idea to make sure that the lug nuts are truly secure. At this point you have successfully changed the brake pads on your car.
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When looking at the pad printing equipment market over the past few years, it is apparent that the biggest change in equipment design and implementation has been the widespread use of sealed ink cup systems over open inkwell doctor blade systems. A sealed ink cup system is essentially and inverted cup that is filled with ink and uses the sharp rim of the cup as a printing plate wiping system. As this system floods and doctors (wipes) a printing plate in the same motion, solvent evaporation and ink viscosity changes are much more limited than with doctor blade systems, making the sealed ink cup printing process significantly more predictable and manageable.
In the US marketplace sealed cup systems have dominated new equipment purchases for a number of years. This article discusses the types and applications of sealed ink cups and advantages of ceramic doctoring rings.
Nearly all sealed ink cup types can be broken into two categories, magnetic or non-magnetic. Both cup styles, when integrated into the pad printing machine yield excellent results for clean, properly doctored printing plates.
A magnetic ink cup is basically “self-doctoring unit”. With its extremely powerful magnets, it has all the necessary down-force to clean the plate requiring the machine to simply pull it back and forth. The magnetic ink cup generally has found its strength in multi-color applications because the equipment can generally be of simple construction and the multi-color pad printer more cost effective.
Non-magnetic ink cups are designed to have the pressure applied by the pad printing machine to an outer flange or centering hole in the cup. The pressure is applied by a spring-loaded system geared for one ink cup assembly. The spring-loaded system is compact and very effective, but is not as simple to deploy on a multi-color machines. The non-magnetic cups seem to have their niche in compact or high speed machine applications. In these systems, even at high speeds, the spring loaded hold-down system keeps the ink cup firmly in place while the plate moves in and out.
There has been much debate about which ring material is best for doctoring printing plates. We would guess that the marketplace is evenly divided between the carbide ring and the new generation ceramic doctoring ring. Today, both carbide rings and ceramic rings work extremely well. It is our opinion however, that the ceramic doctoring ring offers some advantages.
One of the primary advantages of the ceramic ring has a “self-lubricating” qualities that make I work equally well on thin steel and thick steel and the softer polymer printing plates. The carbide rings are generally fairly sharp and abrasive and will wear a polymer plate material quickly. Another advantage of the ceramic doctoring ring is that generally thicker, more robust and resistant to damage by during handling. Most ceramic rings taper from the inside and outside diameter to a “point” roughly .006″ leaving plenty of material near the tip. Carbide rings, however, taper from the outside diameter only to a “point” with a cross section of .003″ leaving only a minimum amount of material near the tip resulting in more damage during operator handling. The combination of the ring profile and the brittle nature of carbide make damage to rings fairly frequent during ordinary use.
In general, the quality of the products in pad printing marketplace have become very high, so regardless of the type of sealed ink cup or ring material you are bound to have a highly successful experience.
Benjamin Adner is the president of Inkcups Now, has over 18 years experience in the pad printing and screen printing industry, and holds 3 major industry patents. His Mechanical Engineering and MBA degrees are applied daily in his attempt to create new products and find innovative solutions to pad printing and screen printing issues. For more information on pad printing, visit Inkcups Now at http://www.inkcups.com
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