5/8-18 Boring head

L

leeko

Stainless

Joined

Jun 30, 2012

Location

Chicago, USA

• Mar 22, 2020

• #1

Hi all,

I have a 5/8-18 boring head holder for my Weldon quick change system, but haven't had much luck in finding a boring head to fit. The only ones I found are a couple of beaten up Bridgeport brand heads on eBay. Did/does anyone else make boring holders with that thread?

Thanks

Lee

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gbent

Diamond

Joined

Mar 14, 2005

Location

Kansas

• Mar 22, 2020

• #2

Erickson tenthset heads. This one is a number 37, or 3/8. They also made number 50 1/2 in and number 62 5/8 in. Looking at the shank on your holder it is not exactly made for a tenthset but I think it would work.

 

L

leeko

Stainless

Joined

Jun 30, 2012

Location

Chicago, USA

• Mar 22, 2020

• #3

Thanks gbent,

I haven't seen the tenthset heads before. Are they nice to use? It looks like they adjust without any tools?

Thanks!

Lee

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gbent

Diamond

Joined

Mar 14, 2005

Location

Kansas

• Mar 22, 2020

• #4

Very nice heads. No tools required for normal machining, but has lock screws for automatic tool changer use. Not a lot of range, as there's only one hole for the boring bar. I used to run them through the tool changer of a CNC without problem. Big adjustments are made with the boring bar diameter itself.

 

L

leeko

Stainless

Joined

Jun 30, 2012

Location

Chicago, USA

• Mar 22, 2020

• #5

Great, thanks! I'll start looking

Lee

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Ray Behner

Diamond

Joined

Mar 27, 2009

Location

Brunswick Oh USA

• Mar 22, 2020

• #6

If you do find one, you may have to disassemble it. Some are getting up in years and dried lube makes for stiff action. Taking it apart is a little involved....and tricky. Wouldn't hurt to take pics. I've had both of mine apart and they still work!

 

4GSR

Diamond

Joined

Jan 25, 2005

Location

Victoria, Texas, USA

• Mar 22, 2020

• #7

Hey, that boring head adapter is for a Chandler boring facing head, for the smaller one.
I have one here I may let go of if interested. It only holds 1/2" shank tools and don't have much travel.

I would suggest making a threaded adapter to adapt it to a more popular boring head. I've done that to one I have here in my shop.

Ken

 

L

leeko

Stainless

Joined

Jun 30, 2012

Location

Chicago, USA

• Mar 22, 2020

• #8

Hi Ken,

Funny you should mention that - after I responded, I got to thinking about making an adaptor - should be fairly straightforward ...

I found this holder in my drawer about 2 days after buying a set of 6 45 taper nikken boring bars from another member here... when it rains, it bores! I haven't received them yet, but I think they'll likely take care of my small-size boring needs.

I do have a Chandler-Duplex boring/facing head sitting in my drawer, but it's a bigger one. I want to say it takes 3/4” bars. It's on an R8 taper - I half-heartedly tried to unscrew the shank a while back, but chickened out before I hurt anything. Do you know if the bigger sizes also take the 5/8-18 thread?

Thanks!

Lee

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4GSR

Diamond

Joined

Jan 25, 2005

Location

Victoria, Texas, USA

• Mar 22, 2020

• #9

The bigger size boring head has a 3/4-16 thread with a register diameter of 1.250". Ken

 

L

leeko

Stainless

Joined

Jun 30, 2012

Location

Chicago, USA

• Mar 22, 2020

• #10

Thanks Ken, good to know

Lee

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I

Illinoyance

Stainless

Joined

Aug 24, 2015

• Mar 22, 2020

• #11

Tenthset heads were marketed under brands including Kennametal.
Uf a Tenthset has been used with coolant it will probably be "frozen". Figure on a bath in hot w water and disassembly. After reassembly and lubrication it should work fine.