Boreing suggestion

[tommied]

When you get into larger bars its easy to mill a slot and make your own, even at different angles, like a 45 degree.
tommie

 

[bollie7]

This is why you save your broken HSS centre drills. The small ones made great boring bar bits (once they are reground of course)

regards
bollie7

 

[outsider347]

OK
Boring bar on the way (Moparfever suggested) and now I'd like to know about any suggestion on the 1/4 HHS tool bit grind.

Just a std LH turning? (I'll be cutting toward the spindle)

Thanks Gents

 

[ScrapMetal]

I use the angled end of the holder unless I'm threading, gives clearance on entry into the bore. That said, you're correct. Grind a left hand tool, but account for the angle of the tool, and give it a lot of clearance on the underside. For that clearance I grind as much away as comfortable for cutting tip support.

Just something else to consider - When boring towards the spindle I make it a point to set a carriage stop at the point I want the boring to end. On blind holes or where you will run in to the chuck just stop the power feed short of the stop and continue feeding to the stop by hand.

Things can get kind of ugly if you lose track of where the end of the bar is.

Hope that helps,

-Ron

 

[outsider347]

Re: Boreing suggestion REPORT

Just wanted to let you know that I had great first time boring bar result. It all worked just the way you said it would)

The piece even parted nicely

Made me smile

Thanks Gents

 

[outsider347]

Hey Outsider, I see you have a Walker-Turner. Me too, although mine's been modified. I replaced the spindle with an ER16 spindle for milling. May be sacrilege to some, but I can put it back to original if I want.
View attachment 42931

Moparfever, tell me about your WT conversion to a mill