Drilling stainless

[Ultradog MN]

That is the killer, too high of speed and the stainless work hardens right where the bit is trying to cut, and at the same time it can also take 'the bite' out of the bit, It really is n almost a requirement to be able to resharpen bits and best to have a few of the size needed when doing multiple holes in stainless.

And/or look for a slow reving, metal capable DP

 

[David2011]

I bought a Drill Doctor 750X a couple of years ago. I find that getting the right relief requires paying strict attention to the grinding process. Although the grind may look OK, it would have a slight negative relieve at the leading edge making the drill unusable until reground. I also found that setting the amount of material to be removed to a minimum helped. It required more passes but consoling the relief was easier.

Glad to see someone "say it out loud." That negative relief has been a problem for me as well when I use a Drill Doctor.

 

[455dan]

And/or look for a slow reving, metal capable DP

Oh Yeah ,

Thanks to you gentlemen on Hobby -Machinist I was able to get that Gear Head Arboga , and then convert it to VFD

Even been able to drill at 30 RPM no problem.

With an annular cutter we been cutting like butter.

The Vevor drill sharpener has been doing a great job as well, it IS easier to get an acceptable grind versus the old Drill Doctor for me.