Profiling with a carbide parting tool and a small cnc lathe
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- The first in what I hope will be a series of videos looking at cutting a profile with a parting or grooving tool. One insert is a a profiling insert, another is a grooving insert and the other is a full radius insert. All 2mm wide
Nice work Nigel.
Seems you have much enjoyment from this small cnc lathe of yours.
Would definitely be the envy of many to own a machine like this.
Semi Retired Machine Shop there are some days when they would be welcome to them. They need a PC with an isa slot and they are not readily available anymore. I have a collection of five in the shed. The ancient electronics are a constant area for failure. I think one of mine has backlash in the satellite screws causing profiling errors and the other has a turret that puts the tools above centre. When working they are brilliant, but painful when playing up.
@@smallcnclathes
I guess we always see the Good parts in videos only.
Never the struggle to make things happen.
Making videos for TH-cam is one struggle i have sometimes ??, LOL.
As i always like to say ?
Every Good has some Bad.
Every Bad has some Good.
Thank your for your videos. I learned a lot.
I hope I can find the sumitool parting tool in the future in a store where I can buy it.
Philipp CNC where are you located?
@@smallcnclathes I come from Germany, NRW😅
I believe Sumitomo tools are available in Germany. I think this is them.
European Headquarters
Konrad-Zuse-Str. 9
47877 Willich, Germany
@@smallcnclathes Thanks for your help!
have you seen this?
th-cam.com/video/W1VQu6rKL8E/w-d-xo.html
G'day mate, where in aus are you getting these tips? I'd love to get my hands on the high rake parting tool and that profiling one...
CEW.Manufacturing I deal with my local Sumitomo rep, who is a great guy. I am in Melbourne, where are you?
@@smallcnclathes I'm up in brissy. I actually just built my own CNC lathe, it works pretty damn well (though I'm biased). It does struggle a bit with parting, mainly from vibration not power. I'm looking for some inserts that may reduce cutting loads/change the way the tool is loaded and make it a tad better.
CEW.Manufacturing will see if I can get a number for you.
You can look up the Brisbane rep on sumitool.com.au
GF insert is for low cutting force parting and ML is the one for profiling. My tool will only part up to 20 dia as the shank is just 10x10 (for my turrets) Go larger shank and you can go larger diameter. Tool holders are expensive but damn good, only tool I ever needed an angle grinder to shorten the shank.
@@CEWManufacturing , The vibration may be down to what you built the lathe out of. Cast iron (traditional) has very good vibration dampening capacity, aluminium has poor dampening capacity so if you lathe has lots of aluminium (cast, extruded, or plate no difference) it will likely vibrate. Incidentally Magnesium has even better damping than cast iron - bit hard to get though 😊... Martin
I think the problem is not that simple. You can achieve true balls easier by the round insert. The tool needs to travel in a path that is the desired radius plus the tool radius and you should be golden. I would be surprised if the cam on the dos software would be able to compensate for tool radii on its own so it might be a manual calculation, easy one though
The 1,6mm step over would only produce a true ball form with a dead sharp cornered tool that is 1.6mm wide. Any part of the tool that protrudes over 1.6mm width will cause it cut too much on the sides, if you measure the ball with micrometers you will notice it's too narrow even with the 1.6 stepover.
It is doable but you need to program the radii oversize by the amount of corner radius and maybe fiddle some with offsets on top of that
you have 2mm wide parting tool and it has 0.2 radius. simple part there was measures even many things not have dimension its all guess work LOL. cut it lol
x-0.4 z0
g3 x13 z-6.7 r6.7
g1 z-8.3
g3 x4 z-14.485 r6.7
g1 (no dimensions to continue)
Jari Sipilainen thank you, will put your data into simulation software when I get the chance.
Thank You, simulated perfectly which surprised me (not that I thought you were wrong), but that normally is not how the software writes code for circular interpolation. Difficult to compare your code with what the software has written. My circular interpolation codes include a "K" and "I" instruction. However, I am starting to think that I should check my lathe for backlash in the ball screws. Would not require much error to mess with this shape. This machine does not actually have ball screws, it has satellite screws which can be more of a pain to adjust. Thank you for you assistance, just wish I knew how to compare what you are writing with what my software gives me.
th-cam.com/video/zuI7quN8HfE/w-d-xo.html
Shows your code in my software.
Nigel
Well now I am definitely smarter.
Well I am not sure I am! Going to fix the centre height problem with my other lathe (I hope) and see if I can do the same part on that one. It may may follow the profile better.