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| 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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