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Re: Indexable carbide insert turning tools

 

Thank you all for answering so promptly.??
The first reaction I had was, "Yes I need to grind the insert holder".? ?But before I did that I read again.? There are many references to the tool holder.? A tool holder means the iron you clamp in a tool post.? (HTRL p27 Figs45-50).? It also seems to mean the iron that the triangular inserts are screwed onto. (I am going to refer to these as "insert holders").? ? If the insert holder is mounted in a tool holder the angle of the cutter is raised, and the bottom corner of the insert holder comes into vertical alignment with the cutter tip. That seems to have been my problem.

I sorted it out by changing back to an HSS cutter.?

In future I will try to use HTRL Fig 50A - 10 in 1 holder.? ?This "detail" had not registered in my tiny brain before now.? I hope that I have learned something.

The inserts are advertised as TCMT, but the full p/n is not given.? ?I have now learned that there is much more to carbide inserts than I had thought.??
Thanks again to all who took the time to comment.?
Re: Indexable carbide insert turning tools

 

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Sounds like there's something in yer setup that needs adjusting . How big of cuts are ya trying to make ? Are you on center line with the work piece ?

animal


On 3/6/24 9:19 AM, William Nelson wrote:

Animal, I guess I just try to push my cutting to hard. I have dulled my Warners cutters many times. The front corner actually get worn down so not as easy to sharpen as just doing the top. These inserts do work well but the lack of a chip breaker is a small problem. They will custom grind them with a breaker but don't know the additional cost. Carbide just lasts longer for me. I just get to impatient I guess.
--
Bill From Socal

Re: Indexable carbide insert turning tools

 

Animal, I guess I just try to push my cutting to hard. I have dulled my Warners cutters many times. The front corner actually get worn down so not as easy to sharpen as just doing the top. These inserts do work well but the lack of a chip breaker is a small problem. They will custom grind them with a breaker but don't know the additional cost. Carbide just lasts longer for me. I just get to impatient I guess.
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Bill From Socal
Re: Indexable carbide insert turning tools

 

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?? What set of tool holder & inserts are you using? I've been running these HSS inserts from HR Warner for years . I'm still on the original inserts & don't think I have put any insert on the 3rd tip yet . A couple I'm still on the one it was on when it left the factory . Super easy to sharpen when needed . The tool holders will also accept carbide tooling , TPMT I believe . I can't say that I can recall the tool holders getting in the way when using this set .

animal

On 3/5/24 7:11 AM, Rick wrote:

I'm assuming TCMT tooling? ?I use this on my SB9A and SB13 all the time, no issues. ?What type of material? ?Let's see a picture of your setup.

Re: Indexable carbide insert turning tools

 

I'm using Sumitomo CCMT32.52ESU AC52OU. Most of these numbers mean something but I always have to look it up. This is the style and size of insert holder I have for external and some internal tools. Not very expensive either. I got 10 for $60 at my local tooling store (Nates Industrial Tools in Torrance CA).? I can walk there if i want but rarely do. Online I belive they are even cheaper. The inserts I had originally came from The Little Machine Shop which were fine for regular mild steel but didn't like the stainless.
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Bill From Socal
Re: Indexable carbide insert turning tools

 

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First thing is to make sure you have the correct tool holder for the insert. There are 2 main styles. Negative and neutral (positive) style. On the negative style, if you look at your tool holder the tip will tilt at a downward angle. On a neutral, the tip will point straight out being parallel to the top of the holder. The insert for a negative the clearance angle is 90 degrees to the top. On the positive insert, you can see a clearance angle on the tip. These are one side usage only. The tool holder provides clearance. The This allows you to use both top and bottom side of the insert. Normally the holder will have a N for negative or P for positive in its part number.

?

If you have the correct style, then what Bill said below applies.

Al-USA

?

From: [email protected] <[email protected]> On Behalf Of Jack Dinan
Sent: Tuesday, March 5, 2024 10:09 AM
To: [email protected]
Subject: Re: [SouthBendLathe] Indexable carbide insert turning tools

?

Bill: Could you provide suggested part numbers?



On Mar 5, 2024, at 10:06 AM, William Nelson <wnnelson@...> wrote:

?

The type of insert may be the problem. I recently had to turn 5" diameter 304 stainless and my "normal" inserts just were not doing a good job. Talked to a tooling guy and got some Sumitomo inserts which cut that stuff like butter. The edges appeared to be much sharper than my other inserts and last a lot longer too. I'm hooked on the new inserts and won't go back to the cheap ones.??
--
Bill From Socal

?
Re: Indexable carbide insert turning tools

 

Yes, I have had to grind the insert holder on some tools.? It was easy and not particularly critical.? Just support the edge of the insert as well as you can.? After that they worked fine.
Re: Indexable carbide insert turning tools

 

I'm assuming TCMT tooling? ?I use this on my SB9A and SB13 all the time, no issues. ?What type of material? ?Let's see a picture of your setup.
Re: Indexable carbide insert turning tools

 

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Bill: Could you provide suggested part numbers?

On Mar 5, 2024, at 10:06 AM, William Nelson <wnnelson@...> wrote:

The type of insert may be the problem. I recently had to turn 5" diameter 304 stainless and my "normal" inserts just were not doing a good job. Talked to a tooling guy and got some Sumitomo inserts which cut that stuff like butter. The edges appeared to be much sharper than my other inserts and last a lot longer too. I'm hooked on the new inserts and won't go back to the cheap ones.??
--
Bill From Socal

Re: Indexable carbide insert turning tools

 

The type of insert may be the problem. I recently had to turn 5" diameter 304 stainless and my "normal" inserts just were not doing a good job. Talked to a tooling guy and got some Sumitomo inserts which cut that stuff like butter. The edges appeared to be much sharper than my other inserts and last a lot longer too. I'm hooked on the new inserts and won't go back to the cheap ones.??
--
Bill From Socal
Re: Indexable carbide insert turning tools

 

A picture would sure help here. I have put a little extra clearance on certain insert tools at times but these were for unusual cuts. Is this just normal OD turning??
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Bill From Socal
Indexable carbide insert turning tools

 

I recently went modern and purchased a box of subject tool bits.? I had been led to believe that tool preparation was a thing of the past.
My 9" Model A? complained with growling and chattering, making a mess of a cut.? Investigation showed that the tool had no clearance between the shank and the work.?
Setting the point on centre helped for a few seconds but then the growling restarted.?

It appears to me that although the triangular insert is shaped, and might have necessary clearances, these are only on the thin insert.? The shank is only cut away parallel to one side of the triangle, the leading edge is vertical (shaped like a WWI destroyer bow).? Is it intended that we grind the shanks to provide the necessary clearances?? ?
Re: interesting

 

Very interesting. I may have to investigate this when making rocket parts. Make a spinning tail chuck then release instead of quickly shutting down the lathe. I forsee a loud band, something breaking, then embedding in my fore head but it sounds plausible.?
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Bill From Socal
Re: interesting

 

Friend of mine said he tried it before and it worked okay. He said you have to stop fast to get a good bond. The lathe he used was pretty big and had a foot brake which disengages the motor and brakes the chuck.
Re: interesting

 

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Yea , I'm not so sure it's a job for these old lathes , but it was something new to me .

animal

On 2/25/24 1:36 PM, Jerry Cc via groups.io wrote:


I wonder if could get enough speed though. Sounds like his really winds up


On Feb 25, 2024, at 3:11 PM, Mark Z via groups.io <bode528@...> wrote:

?I thought that was super cool!? Thanks for sharing.
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........

Re: interesting

 

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I wonder if could get enough speed though. Sounds like his really winds up


On Feb 25, 2024, at 3:11 PM, Mark Z via groups.io <bode528@...> wrote:

?I thought that was super cool!? Thanks for sharing.
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........

Re: interesting

 

I thought that was super cool!? Thanks for sharing.
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........
interesting

 

this popped up after a tube I was watching
Re: Set Up my 16" - Test Cut

 

Brilliant! I'd planned to do the two collar test and the 12" long cut test, but I'm going to add this one to the list, probably at the beginning. Still have to mount my chuck, making the back plate this week.
Re: Set Up my 16" - Test Cut

 

To be clear once I used the 2 1/2 inch bar and skimmed the final coat, over 9 inches I got measurement error.? So roughly within 0.00005".? That is crazy good for a machine like this.
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........
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