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Nylon 645 Features:
645 is currently being used by CNC shops around the world to support quick turn prototypes for Pre-Pilot and Pilot runs as well as some limited production runs. As global supply compresses and just-in-time becomes just-a-little-late, more and more CNC shops are jumping in to fill quick turn needs.
645 is machinable with similar settings and cutting speeds as used in Cast Nylon blocks.
Thermal properties are slightly higher than Nylon 6,6 and Nylon 6,12.
Cutting tools need to be sharp.
Three flute flat end mills are preferred.
Holes to be drilled should be printed the next metric or imperial size down and no less than two perimeters when printing. A calculation should be made such that drilled holes do not encroach on fills and be contained within perimeters only.
645 does not leave any nylon dust residue during tap operations. However, 645 does cut and even with it's slippery properties, some "cuttings" can be retained in the tap'd hole, therefore, these should be cleaned using compressed air.
For tap'd holes that are used for threaded rod, where the rod will be constantly rotated, do NOT use any lubricants as they are not needed and over time will be soaked up into the fill area.
Locking chemicals for blind nuts do NOT work on 645, and as some contain acids, they will weaken bonding.
Tap quality and material thickness follow the same rule as for aluminum.
Threaded Brass Inserts work well when installed with a soldering iron set to 250C
Do NOT use water based solvents as 645 will take on some of the solvent and become discolored. - Permanently!
To adhere other parts to 645, they must also be made of 645 and bonded with "ComPlete Nylon Glue", heat gun or soldering iron.
Pliability of 645 follows the same size and density rules that apply to injection molded nylon for 100% fill parts.
For more pliability, you can reduce fill to something less than 100%
For less pliability in a smaller part, you can decrease the line dia. in the slicing SW. This will cause the printer to extrude more material than usual, thus filling all gaps, resulting in a less pliable part. For overall reduction in tensile, turn any fans that blow onto the part "ON".....Note, these should otherwise always be "OFF".