Insert for turning 4140
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  1. #1
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    Default Insert for turning 4140

    New guy here. I have a oilfield service company and bought a little 1236 Matthews lathe. Usually working with 4140 & 4145 material. Basically just turning and boring. I have very little knowledge when it comes to machining, but would like to learn. I need to buy some new inserts but have literally been online for 3 hours and still dont know anymore than when i started looking. I know that the inserts that came with the machine are CCMT & CCGT. Could someone please point me in the right direction on what to look for. Any help is much appreciated.

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    take a look at ingersoll-imc.com

    there you can do a quick search for turning tools. type in the AKITA search field and immediately it will start to populate a list.

    if you would like to speak to a turning specialist. you can call at speak to someone as well that can help

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    Speak to Curtis - he's a PMer (ex kenna) with a good rep amongst some of the REALLY ornery old machinists round here so will put you right

    Lathe inserts .com

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    Quote Originally Posted by kgraves1 View Post
    New guy here. I have a oilfield service company and bought a little 1236 Matthews lathe..
    Huh ?

    Please elaborate what you doo.

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    Turning the OD and Boring the ID on 4140

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    I think the reason for the 'huh'is the combination of oilfield work and a bench top lathe. The two don't seem to have any connection. I assume that you are doing some very small jobs on the lathe not what most would expect,

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    Quote Originally Posted by billmac View Post
    I think the reason for the 'huh'is the combination of oilfield work and a bench top lathe. The two don't seem to have any connection. I assume that you are doing some very small jobs on the lathe not what most would expect,
    Right.

    Pretty much 1/8-27 isn't "Oilfield" stuff. Not to say it doesn't exist out there, but it's to lubricate the real work.

    Ever wonder why they use Tapered threads anyway? Muscled Plumbers maybe?

    R

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    Quote Originally Posted by billmac View Post
    I think the reason for the 'huh'is the combination of oilfield work and a bench top lathe. The two don't seem to have any connection. I assume that you are doing some very small jobs on the lathe not what most would expect,
    Ah gotcha. Use it for parts on smaller downhole tools. Mostly 4" OD and under. Would really like to learn how to cut EU 8rd threads, and stub Acme as well.

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    You can buy inserts for stub acme screw cutting. You don't have to do thi; you could grind your own HSS tools, and this might be a less expensive way to go while you are getting the process organised.

    Cutting Acme threads on a 4" OD 4140 part would be a stretch for that lathe. Personally I would look for something a lot heavier if you are doing a lot of that type of work.

    If you are unsure about how to single point threads on a lathe, then have a good look at previous posts here and many other places, or ask specific questions.

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    4" pipe on a benchtop lathe!!!!!!!!

    Post some video please.

    R

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    Quote Originally Posted by litlerob1 View Post
    4" pipe on a benchtop lathe!!!!!!!!

    Post some video please.

    R
    Just has to have a big enough bore and you can buy 2 of them, mount them side by side and BAM! Double the pony power. Even increases productivity since you can machine both ends at once.

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    LOL!! Not Pipe, Most parts are under 12" long. I guess I could have worded the above post better. Was just saying normally everything is under 4" OD.

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    To cut 2-3/8 EU 8 RD TBG threads will require a taper attachment and to do it right, thread gages. I don't think your little lathe will handle this. My 15" Sheldon will just barely handle the task doing that kind of threading. Then you have to deal with thead chatter which is a no-no on tubing threads. Ken

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    Quote Originally Posted by kgraves1 View Post
    LOL!! Not Pipe, Most parts are under 12" long. I guess I could have worded the above post better. Was just saying normally everything is under 4" OD.
    No worries dude. Some guys hear oilfield and assume you're making drill collars or the like without considering that DH tools come in all sizes.

    Sent from my SM-G973U using Tapatalk

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    Quote Originally Posted by Cole2534 View Post
    No worries dude. Some guys hear oilfield and assume you're making drill collars or the like without considering that DH tools come in all sizes.

    Sent from my SM-G973U using Tapatalk
    If your raw stock doesn't cost $36000 you ain't making a real part!

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    Quote Originally Posted by CAMasochism View Post
    If your raw stock doesn't cost $36000 you ain't making a real part!
    Haha. If you don't ID grind and air gauge the clearance holes on a bridge girder you aint a real 'chinist.

    Sent from my SM-G973U using Tapatalk

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    Quote Originally Posted by Limy Sami View Post
    Speak to Curtis - he's a PMer (ex kenna) with a good rep amongst some of the REALLY ornery old machinists round here so will put you right

    Lathe inserts .com
    Once again, Call Curtis, he is a wealth of knowledge. He will get you the correct insert, but just as important he can also tell you the correct speed, feed and depth of cut.

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    Quote Originally Posted by moonlight machine View Post
    Once again, Call Curtis, he is a wealth of knowledge. He will get you the correct insert, but just as important he can also tell you the correct speed, feed and depth of cut.
    I haven't found a tool rep yet that will recommend DOC, other than run it full depth if you have the horsepower, rigidity, workholding, and stubby enough tool holding to pull it off.

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    Quote Originally Posted by Hillside Fab View Post
    I haven't found a tool rep yet that will recommend DOC, other than run it full depth if you have the horsepower, rigidity, workholding, and stubby enough tool holding to pull it off.
    Well, have you spoken with Curtis?

    Sent from my SM-G973U using Tapatalk

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    Quote Originally Posted by Cole2534 View Post
    Well, have you spoken with Curtis?

    Sent from my SM-G973U using Tapatalk
    Lol nope. Several name brand guys though. I was more pointing out there are a lot of variables.


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