Hi, I am looking for a countersink/chamfer tool, hole is 5/8 inch, counter sink hole is 1.112 inch wide at least, with a taper on 82 degrees, depth of .5 inch… in AR400 steel, I have tool for 5/8hole, any ideas?
Bolt info,
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I need to recess to 0.5 inch deep, not sure I can do it with that one…
Do you need to have the top of the flat-head screw even this surface of the work piece (as is commonly done)? Or do you need to counter bore 0.500, and then counter sink and additional amount for the screw ( so the top of the flat-head is 0.500 below the surface of the work piece)?
If it is the first case, then that C’sink will do the job, as is. At 82°, with a 1.112" diameter, C’sink will be ~0.640" deep
If it is the 2nd case, one can easily modify this tool on a lathe, and sharpen the upper corner of one of the inserts accordingly, to both C’sink and C’bore.
Alternatively, if you’re doing the job on a CNC mill, C’bore to 0.500 depth with an endmill (interpolate, helix bore, etc), then program a smaller C’sink to generate the correct size C’sink ( step over/down and interpolate as needed.) Depending on the number of holes you need to do, a custom c’bore / c’cink tool, similar to those used to bore hydraulic ports, may be an option.
Just mill the csink rather than plunge like conventional.
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This will work
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