Quick question "Everede" bar

[Mike8623]

This the sight soldering jig I finished couple weeks ago

 

[Winegrower]

I have made a number of insert holders and it seems the Torx screws fit the inserts better…there is a bit of a taper.

 

[Karl_T]

Everede boring bars like this offer is one of the great secrets in machining. I learned about them in my trade school class back in the 70s. The inserts is re sharp able and can make grooving etc. come in both carbide and HSS. have them in several sizes. Still on ebay but you got to watch for deals

EVEREDE 3/4 X 10" BORING / THREADING BAR 10* Lead Angle Metal Lathe Tool Holder | eBay

Condition is Used.

www.ebay.com

 

[Mike8623]

I saw that one listed along with a few other 3/4 everedes. I did notice on all of them the ends seemed to be machined/broken or buggered up/off. I'm wondering if the v groove depth or the amount between the groove and end of the bar was insufficient.

 

[Mike8623]

So guys how deep do you think that v groove should be on a 3/4 bar? I have noticed the bits tend to rise above the groove a bit, in some cases it seems like a lot......I would tend to think the deeper the groove the weaker the end of the bar.

 

[twhite]

When I made mine. I had the inserts sit only .010-.015 proud. The bottom of the V is A bit thin. However I believe there is more of a torsional pressure on a boring bar. So there is not that great of pressure pushing straight down.

Cutting oil is my blood.

 

[Mike8623]

Ok folks, you all got it right.....everede reached out to me......the correct size screw for the 3/4" #250 bar is 10-32

Thanks to all that helped me out here. I drilled and tapped the hole....just have to cut that v and cut the front end to angle and size.

I'm gonna leave the v so that the bit is .015 or so proud as was suggested.

Any other suggestions or comments....it's all good

 

[OTmachine]

A radius at the bottom of the vee groove would be benificial, to the extent the the tool bit would allow.

 

[Mike8623]

K, I will be heading over to helena wednesday. I will pick up some cap screws. I'm also waiting for bits I bought, once I get those I'll measure, layout and cut the v, then finish the end.

I am thinking bout doing a 1 incher, completely from scratch to match the 1/4 bit. I'll be done then. I do like the way the previously posted ones look and like the larger bar matching clamp. Instead of the round hump I'm thinking of a rectangular hump and match it on the clamp. What do you folks think.

 

[Mike8623]

Ok, got it finished