Gallery, Projects and General > How do I??

Milling Titanium

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doubleboost:
Dave
Had a word with the lads who machine the titanium.
They were using "grade 3 " a 5mill cutter running at 5000 rpm with coolant flood
They reckon if you let the job get hot it goes very hard , the finish they are getting is very good
John

jim:

--- Quote from: DaveH on June 13, 2011, 01:22:06 PM ---Jim,

Thanks,
If I may - what tools do you use HSS /  Carbide

With respect to steel do you use a faster or slower spindle speed?

 :beer:
DaveH

--- End quote ---

Either will work, but slow and steady, at least half the speed of steel and a slow feed to. as soon as the tool starts to wear, it'll need changing/regrinding.

HSS will cut very well (it will on most materials if its sharp), in fact, unless you've got the power to take a good size cut, throw away tipped cutters are a waste of time.
a bit like lowered suspension on little cars, done for form, not function!!!

DaveH:
John, Jim,

Thanks very much for the info. :thumbup:

Haven’t tried anything yet but I have much better idea when I do. :)

Thanks
DaveH

mgj:
I don't know what this is for but  basically there is no such thing as a bad finish on Ti. Because of its notch sensitivity and hence a very nasty habit of propagating cracks from any surface imperfections, the finish is either good, or it goes in the trash can. (Not if one is making a gear for a clock or something, of course, but where it is stressed to a useful load to take real advantage of its properties, like say suspension arms or con-rods)

Obviously there are many ways of machining Ti, all of which are succesful - probably the secret is simply a sharp tool. Still I'm surprised, with a work hardening material, that there is advice to keep feed rates down.

jim:
i've been machining it for 16 years

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