Can I machine injection mold ejector pins on a cnc mill ?

Williams

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2023-02-27

I have some 3/8 dia injection mold ejector pins that i need to square off the ends, and I would like to use my CNC to do this, so they are nice and flat on the end verses trying to do it on a bench grinder.
Just curious if a standard 3/16 or 1/4 end mill would work since the pins are made with hardened steel.
The list the material as H13 tool steel ( Rockwell C41 )
I would use a bench grinder to get the length in the ball park, and then use the CNC to get them cleaned up to length.
Second question... if I can use the CNC would I be better to use the side of the end mill for cutting them.... or the bottom of the end mill.... or doesn't it matter?
I don't have a lathe, so that's why I'm not going that route.
If I can use a CNC, any ball park starting recipe for the feeds and speeds would be appreciated.

Patrick

2023-02-28

If they are H13 then you can machine then, they come in many types of hardness though, meaning the can be case hardened / nitride coated or through Hardened, they also come with a variety of other types of coatings.
Make a swing fixture for your bench grinder if you don't have a Surface Grinder or Pin Grinder, you can use a grinder with a cutoff wheel to get them to a rough length, like I said if they are just H13 you could finish mill them.

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