Hi David, thanks for the breakdown on how to properly turn from chuck to tailstock and the best geometry to use. Bookmarked and saved. The brute force of your lathe is simply amazing.....no one on youtube that I can recall can take a .500 cut in Inconel, except maybe your new friend Hmw1972, time will tell!! :) Thanks again for keeping me in mind...you are a great teacher, mentor & friend I appreciate ya! ~ Richard
Hi Richard it's exactly like you did on a big scale. If you ever buy a bigger lathe make sure it's a Dean Smith and Grace. I wanted to put a link to your channel but I don't know how to do it. I do all videos.. editing and uploads from my mobile. Galaxy S9
I would love to work on a larger lathe. Your bell center is larger than my tailstock 😎 Great job on your videos David, I dont even own a cell phone and would be lost on how to edit video on one
Hello Richard. I would have to agree with Dave on the DSG recommendation. I always wanted to buy a large one but they never come up for sale near me. When the Broadbent Schofield lathe came up for sale I jumped on it. It has the weight and power of a DSG (actually slightly more weight) but I don't think it has the finesse. Ken
Ken, your shop and equipment is very impressive, thanks to David I found your channel and subscribed immediately. I am just a home hobbyist with a small lathe but greatly enjoy learning from you veteran machinists. Keep the videos going, its great to learn from you as well~ Richard
Beautiful work! I'm just starting out on a manual lathe, and your videos are really helpful. Especially since we do a lot of the same type of boring, facing operations. Just finished a job with 600 Inconel. Had .015" tolerance for true hole position. Bars were 60" long rough OD. to start, had to put a 5.240 hole through.
That's a big chunk of 718,have turned it on manual but only small diameters and screwing smallest thread 5mm by 15 mm deep.I used to work for a company making stress rupture test pieces for the aerospace industry think Rolls Royce,Siemens and Alston,and also a company in Sweden who made Turbine blades and a few UK Universities.718 was fairly soft compared to some materials some very obscure the only one we gave up on was heat treated Tantalum.Screwing 718 was a 24 mm thread usually roughed out and then hand finished with a tap until we got a CNC lathe.We also had to repair pull bars made from 718 some which had been in the furnace at 650°C for months then you find how tough it gets. Great video's Derek
Great video! The bit of spoken explanation along with seeing the blue print and hearing about the cuts really adds welcome dimension to things. I love that shot of both machines running too. I always wondered if you ran two jobs at once. Thanks.
Just love seeing these deep hogging cuts.... I assume your inserts must be top quality ones.. chips look great. Thanks for the info on this job - always super interesting to know. Excellent video Dave :)
@@userwl2850 Boeing{mcDonnell-Douglas aircraft company] uses a Greenleaf" brand insert for inconel machining. ever hear of that? beats Kennemetal all to hell.
Hi Dave, Very interesting video, nice to see some turning that doesn't involve million £s C.N.C machines and computers. Has there been any progress on the aircraft parts set up and machining those awkward shaped 'titanium ? ' lumps. or have I missed a video since the dentist tooth work on the lathe that you were setting up to do the job .
🤣🤣 holy smokes... I'm at work this very moment doing them on that lathe with the dentist work 😉 14.35 on a Friday afternoon.. I should be in boozer now... mates are ringing me "where are you" I've made a video I want to put on Xmas day where I'm running it with 2 other machines all running at same time. 🍺
I remember sitting in the beer parlour on a Friday afternoon. That was before I had kids. Hopefully in a few years I'll be able to do it again and maybe they can come and drive me home.
I really love your videos, very interesting. Your lathe is very rigid to handle cuts like this. Inconel 718 is one of the hardest material I think bug what mean age hardened? Pierre
Do you run your compound turned like that just because you lack swing clearance? Normally I find my compound doesn't like big cuts turned that way as it isn't as stable supported.
Didn't hear you mention the DOC, so I'll just use 1/2" for a refference. 718 has a tensile strenght of 895 - 1250Mpa / N/mm2. Given a feed of .012"/.3mm x 1/2"/12.7mm DOC it makes an area of 3.8mm2 (actually more since you have a 15° clearence angle). This creates a force of 3.4 - 4.7 kN/340 - 470kg. I think.
@@inconel7185 That's quite an oversimplification of what is happening. There are tables with specific cutting pressures per material which varies with chip thickness. So you cannot just take the tensile strength of a material, you need the specific cutting pressure which is adjusted for the chip thickness then multiply with the chip area. That gets you in the ballpark. Then there are correction factors for lead angle, rake angle, cutting bit material and dry/coolant/oil cut conditions. If anyone is interested I'm willing to dig out my metalworking book and go through an example calculation here.
I didn't hear which insert you are using? I have an old Hendey with a 27" chuck from the early 1900s I'm gonna get going soon. Its a cone head. I don't think it'll take a 1/2" cut though.lol
Hi Bryan. I nearly always use SANDVIK.... they are the most expensive but that's because they're the best. I'm also trying out a Japanese carbide which I will talk about in the future. 👍
hi david, apologies for asking this question if it has already been answered elsewhere, what actually makes this method work so well in regards to the reversal of forces from the headstock onto the tailstock? keep up the good work on the videos, enjoy them immensely and learn things i`d never otherwise have a chance too, best regards from west donegal.
Thanks for the video Dave. I noticed when you turn outside diameters on this lathe that sometimes you use coolant and sometimes you don't. Is there a reason for that? Ken
Hi Ken. Good question. I turn the coolant off when filming so you can see what's happening and sometimes I'm not allowed to use coolant especially on inconel. Also it helps me as I can see when the insert is worn out. 99% of the heat generated transfers into the chips at these slow RPM 👍
Fuck that. I do tiny little parts. Smallest endmill i ever used was .005. Realizing now this is guy is over the pond. So .12 mm. I have no idea how you guys machine in metric.
Hi David, thanks for the breakdown on how to properly turn from chuck to tailstock and the best geometry to use. Bookmarked and saved. The brute force of your lathe is simply amazing.....no one on youtube that I can recall can take a .500 cut in Inconel, except maybe your new friend Hmw1972, time will tell!! :) Thanks again for keeping me in mind...you are a great teacher, mentor & friend I appreciate ya! ~ Richard
Hi Richard it's exactly like you did on a big scale. If you ever buy a bigger lathe make sure it's a Dean Smith and Grace. I wanted to put a link to your channel but I don't know how to do it. I do all videos.. editing and uploads from my mobile. Galaxy S9
I would love to work on a larger lathe. Your bell center is larger than my tailstock 😎 Great job on your videos David, I dont even own a cell phone and would be lost on how to edit video on one
Hello Richard. I would have to agree with Dave on the DSG recommendation. I always wanted to buy a large one but they never come up for sale near me. When the Broadbent Schofield lathe came up for sale I jumped on it. It has the weight and power of a DSG (actually slightly more weight) but I don't think it has the finesse. Ken
Ken, your shop and equipment is very impressive, thanks to David I found your channel and subscribed immediately. I am just a home hobbyist with a small lathe but greatly enjoy learning from you veteran machinists. Keep the videos going, its great to learn from you as well~ Richard
10 rpm with .012" feed rate. Material is INCONEL 718 age hardened.
You're a great master. I'm so sorry you had to close. And sold this powerful lathe.
Hi. I haven't seen you comment before.. thanks man. 👍
Beautiful work! I'm just starting out on a manual lathe, and your videos are really helpful. Especially since we do a lot of the same type of boring, facing operations.
Just finished a job with 600 Inconel. Had .015" tolerance for true hole position. Bars were 60" long rough OD. to start, had to put a 5.240 hole through.
What type of drill did you use on that job? I'm going to convert my craven lathe ready for deep hole boring. 👍
Shame that question never got answered!!
That's a big chunk of 718,have turned it on manual but only small diameters and screwing smallest thread 5mm by 15 mm deep.I used to work for a company making stress rupture test pieces for the aerospace industry think Rolls Royce,Siemens and Alston,and also a company in Sweden who made Turbine blades and a few UK Universities.718 was fairly soft compared to some materials some very obscure the only one we gave up on was heat treated Tantalum.Screwing 718 was a 24 mm thread usually roughed out and then hand finished with a tap until we got a CNC lathe.We also had to repair pull bars made from 718 some which had been in the furnace at 650°C for months then you find how tough it gets.
Great video's Derek
Great video! The bit of spoken explanation along with seeing the blue print and hearing about the cuts really adds welcome dimension to things. I love that shot of both machines running too. I always wondered if you ran two jobs at once. Thanks.
Hi John. I've been running 3 today which I'm putting up on Xmas day. Good to hear from you. 👍
Just love seeing these deep hogging cuts.... I assume your inserts must be top quality ones.. chips look great.
Thanks for the info on this job - always super interesting to know. Excellent video Dave :)
Inserts are Japanese Chris. Hoping to do a video next year. Thanks buddy for the positive comments always. 👍
@@userwl2850 Boeing{mcDonnell-Douglas aircraft company] uses a Greenleaf" brand insert for inconel machining. ever hear of that? beats Kennemetal all to hell.
Amazing amazing. Thanks for explaining. 👍👍👍👍👍👍😷
Thanks. Hope you get to try it👍
first time I've seen this lathe Dave, hoping all's well with you mate
Must be a lot of force trying to take that tool out of the tool post, good video 👍
Insert sales guy must love you... machining all these tough superalloys..
I bloody hope he ain't paying retail!!
Very nice work as ever !!
wish my lathe had that power at low speed. 10mm cut....in my dreams.
Hi Dave, Very interesting video, nice to see some turning that doesn't involve million £s C.N.C machines and computers. Has there been any progress on the aircraft parts set up and machining those awkward shaped 'titanium ? ' lumps. or have I missed a video since the dentist tooth work on the lathe that you were setting up to do the job .
🤣🤣 holy smokes... I'm at work this very moment doing them on that lathe with the dentist work 😉 14.35 on a Friday afternoon.. I should be in boozer now... mates are ringing me "where are you" I've made a video I want to put on Xmas day where I'm running it with 2 other machines all running at same time. 🍺
I remember sitting in the beer parlour on a Friday afternoon. That was before I had kids. Hopefully in a few years I'll be able to do it again and maybe they can come and drive me home.
@@hmw-ms3tx Fridays were invented for beer parlour and boozers and we make kids so they can pick us up when we've had enough... 🍺
I really love your videos, very interesting. Your lathe is very rigid to handle cuts like this. Inconel 718 is one of the hardest material I think bug what mean age hardened? Pierre
Google "precipitation hardening" you can read in your language.. 👍
Do you run your compound turned like that just because you lack swing clearance? Normally I find my compound doesn't like big cuts turned that way as it isn't as stable supported.
At 9.45 ???? I had to put a 20° angle in the bore.
@@userwl2850 At 90 degrees. I hear it's common in Britain for some reason, us yanks tend to stick to 30 degrees.
Id love to know the force exerted on cutting tool on these cuts, great as always Dave
Thanks David. Good question I'd be interested to know too 🤔
Didn't hear you mention the DOC, so I'll just use 1/2" for a refference. 718 has a tensile strenght of 895 - 1250Mpa / N/mm2. Given a feed of .012"/.3mm x 1/2"/12.7mm DOC it makes an area of 3.8mm2 (actually more since you have a 15° clearence angle). This creates a force of 3.4 - 4.7 kN/340 - 470kg. I think.
@@inconel7185 That's quite an oversimplification of what is happening. There are tables with specific cutting pressures per material which varies with chip thickness. So you cannot just take the tensile strength of a material, you need the specific cutting pressure which is adjusted for the chip thickness then multiply with the chip area. That gets you in the ballpark. Then there are correction factors for lead angle, rake angle, cutting bit material and dry/coolant/oil cut conditions.
If anyone is interested I'm willing to dig out my metalworking book and go through an example calculation here.
super awesome man ! Great share ..
Cheers Shawn. 👍
I didn't hear which insert you are using? I have an old Hendey with a 27" chuck from the early 1900s I'm gonna get going soon. Its a cone head. I don't think it'll take a 1/2" cut though.lol
Hi Bryan. I nearly always use SANDVIK.... they are the most expensive but that's because they're the best. I'm also trying out a Japanese carbide which I will talk about in the future. 👍
Why do you do roughing cuts left to right, I was taught to always work to the chuck
Dave already did a vid on this. For sunpuppa(spelling!)
@@craigwalker3256 yeah but he didn’t really explain why, he just showed that his lathe wouldn’t cut right to left.
Bollocks I've just orderd one of them shit CNMG tools, why didn't you put your video up 4 days ago,😪
Great action as always Dave.
Alan.
Oòops.. soz Alan 🤣 just don't take big cuts and you'll be fine 👍
hi david, apologies for asking this question if it has already been answered elsewhere, what actually makes this method work so well in regards to the reversal of forces from the headstock onto the tailstock? keep up the good work on the videos, enjoy them immensely and learn things i`d never otherwise have a chance too, best regards from west donegal.
The old lathe vibrates like fuck when turning toward chuck. Much better the other way!!
Just love DS&G's
Do you think a 1/2hp lathe could turn 35mm 718?
What task is the workpiece eventually going to perform?
Satisfying video
Where's the line, from right to left or opposite direction?
Left to right is the best way. 👍
Cool.
Your swarf must have a decent monetary value. 4you wouldn't throw it away
718 at the moment is £6000 ton scrap. 50% nickel.
Wow. Surprised the customer doesn't ask for it back
Qual e a marca desse torno mecânico ?
Почему проточка от патрона, а не на патрон? Why groove from the cartridge, and not on the cartridge?
Ever ponder LNMX?
Is the tool lower than centerline?
Good old DS&G.
Best ever made. 👍
Thanks for the video Dave. I noticed when you turn outside diameters on this lathe that sometimes you use coolant and sometimes you don't. Is there a reason for that? Ken
Hi Ken. Good question. I turn the coolant off when filming so you can see what's happening and sometimes I'm not allowed to use coolant especially on inconel. Also it helps me as I can see when the insert is worn out. 99% of the heat generated transfers into the chips at these slow RPM 👍
Why do you feed away from the chuck
Many thanks for the words Dave. Makes a massive difference for us. How can we get in touch with your firm if we have work ?? Cheers Mike
Then you may like the video I'll put up on Xmas day with me multitasking. 😓 thanks for watching. 👍
Look on my channel and go on the about link for my website.
How many insert edges did you get through on this part
3 inserts each with 8 cutting edges. 👍
Fuck that. I do tiny little parts. Smallest endmill i ever used was .005. Realizing now this is guy is over the pond. So .12 mm. I have no idea how you guys machine in metric.
Popcorn
i don't like your way of making the lathe work