Boring / Grooving / Threading.

[Xnerd]

Well the form is still acting up for me but in a different way it's not telling me that there's new posts added and then all at once it'll tell me about all of them. Anyway back to the point yes I like them because of the way the tooling is held in the Square slot. And they were very very stiff I don't know what they're made out of I do have some 4150 in half and one inch that I could use I also have some tool steel that I could use but I really need some real small stuff and I don't know how I would get a square profile hole in something small without having perhaps a broaching tool.

I can make HSS boring and threading tools I just really like these.

I also use a dial indicator for depth so now the death markings are no real added Plus for me. I find that a lot of the old tools are really good I really like them. I have some newborn bars from an aerospace company did I tell you the truth I like the old stuff better

Sent from my SM-T800 using Tapatalk

 

[Xnerd]

To send pics using Tapatalk you will need to click on the paperclip.

I clicked on the image LOL who'd a thought lol you would think that the image icon would post an image LOL

Sent from my SM-T800 using Tapatalk

 

[Xnerd]

I would like to ensure everybody that I have looked everywhere on the damn internet for this and I cannot find this item anywhere. I have seen a few pictures of this type of boring bar but no real information on are they still available to buy or do you have to find old garage sale items xcetera. I got a couple of these bars with some lathe parts that I bought off of Craigslist. I don't know if these are antiquated or not, they kind of look like they are, but they really really work good either way. I do not know what they are made of but they are stiff as all get-out. I really need some more of these smaller ones though.

If anybody has a few of these to sell, please message me. If anybody knows where you can still buy them let me know.



Sent from my SM-T800 using Tapatalk

Sent from my SM-T800 using Tapatalk

 

[Xnerd]

Okay officially hate tap talk I can't edit my post I can't do anything

Sent from my SM-T800 using Tapatalk

 

[Bob Korves]

I have my original set of Everede Boring bars I bought back in 1978, they came in a cardboard box!
I've added a lot more of them to my collection over the years, too.

I don't have a box at all, Ken, but I have the Everede bars, a set from 3/8 to 1", and an Everede bar holder for a lantern tool post. Also a bunch of bits, both HSS and carbide, and an Everede bit grinding fixture. You can't machine anything using a box (but, yes, I love the old boxes, too!)

Look here: http://everede.net/documents/2014_everede_product_catalog_web.pdf
Boring bars: page 63, I have set 200-C
Engine lathe boring bar holder: Pages 67 and 68
Bits: page 69, HSS and carbide
Grinding blocks: Page 71, mine is nicer than any of those, and multi functional.

These are very nice boring bars!

 

[mikey]

Another option is the Circle Machine QCMI series of carbide bars. They come in 3/8", 1/2" and 5/8" diameters. They will accept boring, grooving and threading inserts. The carbide bar helps to hold pretty tight threading tolerances and the bar bores like silk.

 

[Xnerd]

Another option is the Circle Machine QCMI series of carbide bars. They come in 3/8", 1/2" and 5/8" diameters. They will accept boring, grooving and threading inserts. The carbide bar helps to hold pretty tight threading tolerances and the bar bores like silk.

I basically have a lot of boring bar options I have some of those Cheapo pre-made carbide ones there are other crap and I hate. I got a bunch of bars from Aerospace. I get them because they have such high control because they're military-spec that if something gets obsolete it by engineering they can't use it anymore have to get it out of the building so they threw it away or let the guys take them home.

For some reason I just really like using these old ones they just feel solid. I have a really old boring bar holder too I just love it it's so stiff I mean you can not budge it looks like this

Sent from my SM-T800 using Tapatalk

 

[benmychree]

Photos:

A few of the boring bars in the shop. Several more are on the machines.




Bits ground for each bar; small guys on the top row are 1/4" and 3/16".




Top one is a 1" I made from a Thompson linear bearing rail. Nice alloy and it is case hardened.



Middle is a 3/4" I purchased from Enco.

Bottom is a 3/4" I made from a length of 4140 shafting.

End view:




Square stock drilled for 3/8" and 1/2" bars. They go in the 4 Way tool post in the background.



They will also take the carbide tipped bars:




And the Holy Grail. Everede bars that take a triangular bit. Real easy to grind the bits and the angles are built into the bar.



This Everede set is from the early 1960's. You know it is quality when the set comes in a wood box!




The shop made 3/4" in action. Cutting oil grooves in motorcycle con rods. The jig was handy, I had 30 to do. Note the dial indicator for depth control.

View attachment 140675

Boring a sprocket with the shop made 1" bar.

View attachment 140676

One thing that most folks do not know is that there is virtually no difference in ridigity between hard and soft steel, alloy or carbon types; all steels have the same modulus of elasticity, or very nearly so; the only way to increase ridigidity is to either use a material with a higher modulus or to increase the diameter of the bar, which has a large effect; a 1 -1/4" bar has 5 time the rigidity as a 1" diameter, or to reduce overhang; about the largest ratio of overhang for efficient work is 5 or 6 to one, dia. VS overhang. As to boring bars, my all time favorite when it comes to HSS is the line of Bokum tools, with solid (integral) shanks and the screw on types; they are made in lead, flat bottom, threading, chamfering and grooving styles from tiny to BIG, they are form relieved and all are sharpened by grinding ONLY the top surface of the tool.

 

[Mutt]

Photos:

A few of the boring bars in the shop. Several more are on the machines.






What brand lathe is that and how do you set up a sprocket , so the center hole runs true?

 

[Mutt]

OOps. don't know what happened here.

Ben,

What brand lathe is that and how do you set up a sprocket, so the center hole runs true to the o.d. of the teeth?