I need to machine a 1" diameter recess, 0.050" deep, into a faced piece of 12L14 LC steel. Another piece, 1" outside diameter, will rest in that recess, ideally with a tight fit. I'd like to be able expand the width of the recess incrementally until a tight fit is achieved.
I don't have any specialty cutters like Trepanning tools, just the basics.
Ideas for best way to proceed?
Machining a recess in a faced piece question
Re: Machining a recess in a faced piece question
Don't have the cutter you need? Grab a HSS (high speed steel) tool blank and grind one! Here's how:dml66 wrote: I don't have any specialty cutters like Trepanning tools, just the basics.
https://www.youtube.com/watch?v=6PcEBaset1I&t=0s
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Re: Machining a recess in a faced piece question
Start with an end mill to clear out the center.
Too many things going on to bother listing them.
Re: Machining a recess in a faced piece question
I ground this one for a quick job. It is ground for tapered sides, but this should give you an idea.
It would benefit from a bit of top rake, but it cut fine for what it was needed for.
It would benefit from a bit of top rake, but it cut fine for what it was needed for.
Glenn
Operating machines is perfectly safe......until you forget how dangerous it really is!
Operating machines is perfectly safe......until you forget how dangerous it really is!
Re: Machining a recess in a faced piece question
OK, I don't have a mill, but I do have an inherited end mill, 3/8". Lets say I clear out the center, what's next?
Re: Machining a recess in a faced piece question
If it’s a flat bottom hole across the entire 1” diameter you should just be able to use a facing tool. If you’re cutting a groove, you’ll need one like what Glenn shows.
0.050 isn’t very deep so you’ll probably want a super sharp corner on your cutter. It will wear out fast but may be necessary so your solid bar sits properly. Chamfering the end of the bar that sits that shallow doesn’t give you much room for error for the tight fit you want.
Griz
0.050 isn’t very deep so you’ll probably want a super sharp corner on your cutter. It will wear out fast but may be necessary so your solid bar sits properly. Chamfering the end of the bar that sits that shallow doesn’t give you much room for error for the tight fit you want.
Griz
Re: Machining a recess in a faced piece question
I spent so much time examining the piece to be located on the workpiece, I overlooked the 1/2" hole already center drilled in the workpiecehobgobbln wrote: ↑Sat May 21, 2022 11:43 am If it’s a flat bottom hole across the entire 1” diameter you should just be able to use a facing tool. If you’re cutting a groove, you’ll need one like what Glenn shows.
0.050 isn’t very deep so you’ll probably want a super sharp corner on your cutter. It will wear out fast but may be necessary so your solid bar sits properly. Chamfering the end of the bar that sits that shallow doesn’t give you much room for error for the tight fit you want.
Griz
So, I think this will be a center-out facing operation. Since the piece to be located will be secured by three screws drilled and tapped in the workpiece, I don't think an absolutely perpendicular outer edge on the recess is needed; it just needs to be tight, and seated flat. If I'm wrong about the inner edge perpendicularity, a boring bar should fix that.