A brass brush is the best thing, along with some of the citrus-based cleaners available, allowing them to be safely used on the shop floor. Do Notusea petroleum based lubricant for cleaning, as it will only act as a magnet for all the dirt and dust by the residue it leaves behind.
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Calculating Feeds and Speeds There are certain parameters that must be considered, before setting up any file for cutting if you are to accomplish the finish and accuracy required. One of the most important of these factors is the Chipload (Cpt). Chipload can be defined as the size or thickness of the chip that is removed with each flute per revolution. When material is machined the cutter must revolve at a specific RPM and feed at a specific feedrate to achieve the proper Chipload. There are also several factors to be considered when choosing the proper RPM and feedrate: a.The power and rigidity of the machine b.Depth and width of cut c.Sharpness of the cutting tool d.Design and type of cutter e.Material being cut f.Finish and accuracy required The feed rate used depends upon a variety of factors, some of which are listed below: a.Rigidity of part hold-down b.Power and rigidity of the machine c.Depth and width of cut d.Sharpness of cutting tool e.Length of cutter f.Design and type of cutter g.The material being cut h.Finish and accuracy required i.Spindle speed j.Manufacturer of cutter k.Number of cutting flutes l.Diameter of the bit m. Material the bit is made ofn.Spindle usedo. Coolant usedWhat we must do is sort through this list of variables and given the equipment and material we have to work with optimize each of these variables when choosing the optimum feed rates and RPM to attain the optimum Chipload. One thing to remember is to make chips and not dust. Chips will help by removing the heat produced in the cutting process thus increasing tool life and edge quality. Feed is calculated using the following equation: Feed= N x x RPM N- the number of cutting edges cpt - chip load (chip per tooth) is the amount of material, which should be removed by each tooth of the cutter as it revolved and advances into the work. (Feet inch per tooth) RPM- the speed at which the cutter revolves in the spindle. (Revolutions per minute) We will now break down the relationship between the Feed rates, number of cutting edges, chip load and RPM. For most materials there is a recommended chip load. If you arerunning at 18000 RPM using a 1" endmill with two flutes, and a recommended chip load of 0.004 ft/tooth: Feed =2 x 0.004 x 18000 = 144 inches per min If the RPM were increased to 24000 RPM the new feed rate would workout to be: Feed =2 x 0.004 x 24000 = 192 inches per min Based on this mathematical equation as RPM increases, feed rate will also increase if all other settings remain the same. If the number of cutting edges changes, however the feed rate will either increase or decrease depending on the whether the number goes up or down. The same applies to chip load. If the recommended chip load is 0.004 ft.
Milling cutter, High speed steel, Cutting, Collet, Downcut Spiral
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