Boring bar Recommendation for a SB 9

Rick_B · Oct 14, 2014

Good afternoon folks - I have a SB heavy 9 that I want to tool up for boring. Currently it has an Aloris AXA tool post and a Phase II boring bar holder that takes either a 34/4 or 5/8 bar shank. I was looking at Enco's carbide tipped bars but have always heard the smaller SB lathes and carbide were not a good match. I also don't have any method for sharpening carbide. My current project is to bore a 2" hole 1/2" deep in steel.

Is a C6 carbide boring bar OK for this or should I be looking for a bar that takes HSS inserts? I haven't yet found any HSS bars yet?

Thanks
Rick

Dave Storm · Oct 14, 2014

I just picked up a pair of boring bars for use on my Leblond Regal made by 'Everede' - they use triangular HSS Inserts, which are available through Enco (Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies) and possibly other sources.

I just used them to bore and thread a new backing plate for a 3 jaw chuck, and was very pleased with the results.

stonehaven · Oct 14, 2014

boring bars for hss should be an easy find on ebay. you should be able to bore hole in meantime with a properly ground hss toolbit with clearance, its only 1/2 in deep.

aametalmaster · Oct 14, 2014

You can never have too many boring bars. I have at least 30 different ones. Some work better than others for different jobs that come in the door..Bob

michiganbuck · Oct 14, 2014

Back in the day we would have tool bits sharpened for a short depth boring used alone and simple ½ , ¾ and 1” or more piece of shafting with a tool bit hole and set screw. Good way to use up too short HSS bits. Much like what we often called Armstrong boring bars.

SteveM · Oct 15, 2014

aametalmaster said:
You can never have too many boring bars. I have at least 30 different ones. Some work better than others for different jobs that come in the door..Bob

That and the fact that the larger the boring bar, the better, and with an assortment, you will likely have some big ones.

Boring a 2" hole, you can use the biggest boring bar you can take (3/4").

A boring bar like this one uses HSS, and works great for those leftover scraps, like michiganbuck said.

Typically, one end has a hole at a 45 degree angle and the other end is at 90 degrees.

I got that shot from ebay, but that one is a 3/4". Do a little searching and you should be able to find a 3/4" and/or 5/8"

Steve

MetalCarnage · Oct 15, 2014

Arthur R. Warner would be my recommendation on boring bars. HSS inserts (can use carbide) and well made tooling. Arthur R. Warner Co. | Specialists in High Speed Steel - Boring

JMHO

-Ron

SteveM · Oct 16, 2014

MetalCarnage said:
Arthur R. Warner would be my recommendation on boring bars. HSS inserts (can use carbide) and well made tooling.

The Warner bits will look expensive, but all you need to do to sharpen them is put them face down on a sharpening stone and rub them around. Also, they won't chip on an uninterrupted cut like carbide can. Between those two factors, you can get a lot more use out of them.

See here for some information on them:
High Speed Steel Lathe tooling.AVI - YouTube

Steve

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