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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Insert for turning 4140
- Thread starter kgraves1
- Start date
- Replies 24
- Views 3,085
vr6
Aluminum
- Joined
- Jul 2, 2010
- Location
- northern illinois
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
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
Limy Sami
Diamond
- Joined
- Jan 7, 2007
- Location
- Norfolk, UK
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
so will put you rightLathe inserts .com
billmac
Stainless
- Joined
- Oct 17, 2004
- Location
- Lancashire, UK
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
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.
billmac
Stainless
- Joined
- Oct 17, 2004
- Location
- Lancashire, UK
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.
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.
CAMasochism
Stainless
- Joined
- Jun 6, 2019
- Location
- DFW, Texas
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.
4GSR
Diamond
- Joined
- Jan 25, 2005
- Location
- Victoria, Texas, USA
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
Cole2534
Diamond
- Joined
- Sep 10, 2010
- Location
- Oklahoma City, OK
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.
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CAMasochism
Stainless
- Joined
- Jun 6, 2019
- Location
- DFW, Texas
If your raw stock doesn't cost $36000 you ain't making a real part!
Cole2534
Diamond
- Joined
- Sep 10, 2010
- Location
- Oklahoma City, OK
Haha. If you don't ID grind and air gauge the clearance holes on a bridge girder you aint a real 'chinist.
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moonlight machine
Diamond
- Joined
- Nov 19, 2007
- Location
- marysville ohio
Speak to Curtis - he's a PMer (ex kenna) with a good rep amongst some of the REALLY ornery old machinists round here
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.
Hillside Fab
Cast Iron
- Joined
- Nov 16, 2014
- Location
- Missouri
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.
Cole2534
Diamond
- Joined
- Sep 10, 2010
- Location
- Oklahoma City, OK
Hillside Fab
Cast Iron
- Joined
- Nov 16, 2014
- Location
- Missouri
Lol nope. Several name brand guys though. I was more pointing out there are a lot of variables.
