Perfect Spot Faces
Perfect Spot Faces
(OP)
Hello
Right we have a job that requires oil pathways to be drilled through steel forgings, with a 1/4bsp thread at each end, a 9mm deep 32mm spot face is also required.
According to our customer the spot faces have to be almost mirror finished.
we are using an XYZ mill cnc, and our results so far have been on the borderline of acceptable.
What tools or methods should we try to get a mirror finish and perfectly flat?
any help would be very grateful
Right we have a job that requires oil pathways to be drilled through steel forgings, with a 1/4bsp thread at each end, a 9mm deep 32mm spot face is also required.
According to our customer the spot faces have to be almost mirror finished.
we are using an XYZ mill cnc, and our results so far have been on the borderline of acceptable.
What tools or methods should we try to get a mirror finish and perfectly flat?
any help would be very grateful





RE: Perfect Spot Faces
RE: Perfect Spot Faces
We have had much success with this companies tools.
also Cogsdill
RE: Perfect Spot Faces
BSP threads don't seal, so need a sealing surface. If an o-ring sealing is doing the sealing then a 32 RMS finish made by plunging to produce circular, not spiral tool marks should be fine (enough).
I can picture some spiral marks giving them trouble, and the repair required going to a highly polished surface.
standard O-ring finish specs here - http://www.allorings.com/gland_static_radial.htm
RE: Perfect Spot Faces
RE: Perfect Spot Faces
Software For Metalworking
http://mrainey.freeservers.com
RE: Perfect Spot Faces
RE: Perfect Spot Faces
Also you can first make a spot face operation without interpolation. This will give you circular traces that are required from many companies for o-ring sealing surface. Then you can apply a silicon carbide brush with 80 grit to soften the trace. You can get a flatness that comes from the spot face insert. So you should check it before the operation. Also I should say that you can't reach the surface like mirror with silicon carbide brush (brush with abrasive flament). But please consider that may be you can reach the technical drawing specs with a dull surface.
Burnishing is also a good solution but you can carefull of the tool life because of high contact force on the pins.
RE: Perfect Spot Faces