- Joined
- Dec 20, 2021
- Messages
- 1,069
A few days ago I realized I needed to modify a part I built and heat treated. CPM3V, HRC60... Not looking foreword to drilling holes in that.
I've done it before, so knew the needed tool was a carbide spade bit (or two actually, two size holes). Luckily I had some old end mills and one of the import D-bit grinders. First steps were to cut the old end mill down to a blank, then create the flats of the spade, and then 'sharpen the drill.
All things considered the bits turned out OK. The moment of truth was punching the first hole. Keep in mind this is darned tough, very hard steel getting drilled. It cut just fine. Of course, with something like this, start drilling and DO NOT STOP. And keep the tool pressure up. That is, pull down on the handle hard as it drills. Cut a really nice little chip. Did four holes, but this one is the first one which was a major win!
Today's project is adding guides to the above part. Of course all I've done so far is CAM work. Roughing and Finishing operations. That's taken all day so far!
Maybe I'll get this part made before midnight...
Happy New Year to all of you here!
I've done it before, so knew the needed tool was a carbide spade bit (or two actually, two size holes). Luckily I had some old end mills and one of the import D-bit grinders. First steps were to cut the old end mill down to a blank, then create the flats of the spade, and then 'sharpen the drill.
All things considered the bits turned out OK. The moment of truth was punching the first hole. Keep in mind this is darned tough, very hard steel getting drilled. It cut just fine. Of course, with something like this, start drilling and DO NOT STOP. And keep the tool pressure up. That is, pull down on the handle hard as it drills. Cut a really nice little chip. Did four holes, but this one is the first one which was a major win!
Today's project is adding guides to the above part. Of course all I've done so far is CAM work. Roughing and Finishing operations. That's taken all day so far!
Maybe I'll get this part made before midnight...
Happy New Year to all of you here!