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  #31  
Old 13th October 2009, 06:07 PM
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3GE Components 3GE Components is offline
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The problem with stainless is that it has a work hardened surface that you need to get under, if you let the drill run slow, this will work harden the material and the drill will burn out. What you need to do is have a sharp drill and don't be affraid to push it. Oh and use plenty of coolant

Kind regards

John
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  #32  
Old 14th October 2009, 06:11 PM
flyerncle flyerncle is offline
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I must just be unlucky John,I had the lathe running fairly fast and was not frightened to push the drill hard but no luck, it was scrap studding so who knows what it was but it is hard stuff.
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  #33  
Old 14th October 2009, 06:12 PM
londonsean69 londonsean69 is offline
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Cobalt is your friend

But your wallet will hate him
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  #34  
Old 14th October 2009, 06:17 PM
flyerncle flyerncle is offline
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Bloody expensive drills Sean...
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  #35  
Old 14th October 2009, 06:40 PM
londonsean69 londonsean69 is offline
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Quote:
Originally Posted by flyerncle View Post
Bloody expensive drills Sean...
I know

Better if you buy a set, but mine were still £50+ for 1-13mm in 0.5mm steps

Still, they only come out the box for tough stuff

I actually have a set of HSS, plus a set of Titanium coated (nicer on ally) as well.

Different tools for different jobs.
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  #36  
Old 14th October 2009, 06:55 PM
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squbti squbti is offline
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we work almost only with stainless & have never had any problem drilling ,however it can happen that the drill wasnt sharp or wrong speed & the drill can burn & then what happens is that alot of the drill matirial stays in the hole & makes the steel immpossible to brill (so the inside of the hole can get as hard as the drill itself when it burns).
cheers
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  #37  
Old 15th October 2009, 07:13 PM
flyerncle flyerncle is offline
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Made them from steel bar in the end,easy to machine and for the use they will get, probably last a lifetime.
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