Parallel counterbores

[Spruewell]

Working on a part that starts 1" round 303 Stainless. I need to put flats on either side and then counterbores as shown. I'm running a HAAS VF2 with SRT210 4th axis. I also have 5C indexer. My VF3 with the good 4th axis is tied up with another job. I'm not sure I trust the SRT210 to consistently hold the .0005 parallel tolerance I need. Concentricity between the bores is not as critical



Any suggestions?

 

[mach ramsey mn]

How are you cutting the part off? Or putting the flats on?

 

[Garwood]

Can you rough one counterbore, leave a few thou on the floor, rotate 180, then reach through from the top with a single point tool and spot face the counterbore floor?

 

[Vancbiker]

These folks might have a solution…..

Back Counterbores : Custom Indexable Tool Manufacturer

Custom Indexable Tool Manufacturer : Back Counterbores - Custom Indexable Tooling Plunge Mills Center/ Spot Drills Forward Counterbore/ Core Drills Back Counterbores Angle Chamfer Mills Back Chamfering Tools Drills Weld Preperation Mills Boring Bars...

vermontindexable.com

 

[Spruewell]

I intend to bar feed the material for the first ops (those features aren't detailed in the sketch), however I don't have a Y axis in the lathe to do the bore. I have 1 radial live tool available, which means I can either drill or counterbore, but not both. And I'm not confident that the live tool is rigid enough to do that counterbore in stainless. I was planning to take the blanks to the mill to machine the flats and run the bores.

 

[Barbter]

You know your kit and already doubt it. So for piece of mind, a fixture is my answer.
Load the table up with 4(?part length dependant) side 1's, and then flip and do the 4 (?) other sides.
Yes it's an extra op but quickish to load and you won't then have an issue....