Spining 304 ss

[Bridged]

I need help trying to spin 304 stainless tube.
Im using 1/2 x 18 gauge tube and flaring the front out to .700 at 45 degrees.
Im currently using a 6mm carbide bar with a radius ground on the front like a bulnose in a cnc lathe and forming it out from the inside.
Problem is if I run it dry or with oil it gets very very hot and destroys the tool very quickly. If I run it with coolant it splits on the seam of the tube.
Im fairly new to metal spining can someone help me out with some ideas please?

[larry53]

When I am doing metal spinning I use a brass bar. I had good results with the brass. Larry

[M-man]

Is this kind of operation possible in a standard cnc with special tools or ?

[Bridged]

Originally Posted by larry53 When I am doing metal spinning I use a brass bar. I had good results with the brass. Larry

Do you mean you use a brass tool to form it?
Can you plese explain in a bit more detail?

[larry53]

What I mean is take a round brass bar around 14 inches in length and 3/4 diameter. I round the end of the bar. In my case I am usually forming around a forum. I use a tool holder with a square bar mounted in the tool holder, at 90 degrees to the chuck. I rest the bar on the bar mounted in the tool holder, and with the lathe running I pull the bar against the tool holder and the material I am forming. I hope this helps.

[Bridged]

Originally Posted by larry53 What I mean is take a round brass bar around 14 inches in length and 3/4 diameter. I round the end of the bar. In my case I am usually forming around a forum. I use a tool holder with a square bar mounted in the tool holder, at 90 degrees to the chuck. I rest the bar on the bar mounted in the tool holder, and with the lathe running I pull the bar against the tool holder and the material I am forming. I hope this helps.

Ok so your doin it by hand yea?
Would it be possible to automate it using a convetional slant bed cnc lathe?

[larry53]

I have no idea. May be some one else of this forum could help you.

[fsa]

HELLO EVERY BODY I AM ASIF(FISA) I KNOW THAT THIS IS A RIGHT PLACE TO SHAREING OUR THECNICAL PROBLEM AND I BELEIVE THAT EVERY DAY THERE ARE LOT OF PROBLEMS SOLVEED HERE THANKS ADMINISTATOR FOR GINING US A RIGHT PLACE.
NOW COME TO THE MY PROBLEM.MY PROBLEM IS I AMA NEW COMER IN SPIN FORMING AND WANT TO MAKE THIS PART(see jpeg) through spining process.i am trying to makke this part from last 10 days but still unsucessful.i dont know where i am wrong i see different videos on internet for ideas to make this part and adopt lot of things for those videos but result is zero.i am attaching the jpegs of my job set up and also part specification and tool path which i was generated on mastercam lathe for machining path.this is the request for all the technical persons that plz help me i realy need some one advice for solving this problem because now my colleague doing jokes on me about this part.i am also posting a jpeg of my tool path wana know that is it right tool path for this part. plz help

[DONNYBRASS]

I have spun some metal and by the way I am looking at you part the reason is breaking on the back corner is because the material is getting to thin in that corner so to fix that problem you might want to use thicker material are not streech the material so much.you can also bring down some material into that corner by making some backstrokes. the way you can fix the front nipple is you can make a female and a male chuck and just press the nipple then put in on your spin tool and start laying it down on the tool.
good luck and have fun .

[fsa]

thanks for reply i want to monw that the profile of tool path is good enough for spining this part??and also can u understand me with some sketches about back stroke and male female chuck (you can also bring down some material into that corner by making some backstrokes. the way you can fix the front nipple is you can make a female and a male chuck and just press the nipple then put in on your spin tool and start laying it down on the tool.)this is wat u said about backstroke and malefemale chuck system.today i also used 0.8mm thick sheeet for same purpose and this time the sheet is break from start of the angle,after break i check the thickness of that area .the thickness is 0.09mm.plz give me advice or some adress of web site where i can get some basic information about cnc spining and its tool path.

thanks

[Khalid]

this is called " How to hijack other thread"

[shortbus_cnc]

You mean "Another thread" fsa is basically a broadcast poster.