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Drilling valve stems


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  #1  
Old 12-10-2008, 12:26 AM
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B. K. Lahey B. K. Lahey is offline
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Question Drilling valve stems

I need to drill a 1/8" hole in 2 valve stems for the lock pins, they are modern collett type valves and are as hard as the hobs of hell.
I have heated to a dull red to no avail.

Need some advice please,
thanks,

BK
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Old 12-10-2008, 12:55 AM
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Default Re: Drilling valve stems

Check the random threads near the bottom of the page.
THIS one pretty much sums it up: http://www.smokstak.com/forum/showthread.php?t=20029
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Old 12-10-2008, 03:57 AM
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Default Re: Drilling valve stems

Thanks for the link Craig, that might solve the prob.

BK
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Old 12-10-2008, 12:09 PM
K D Redd K D Redd is offline
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Default Re: Drilling valve stems

Soild Carbide drill bit and turn it FAST.

Kent
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Old 12-10-2008, 12:24 PM
terry tabb terry tabb is offline
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Default Re: Drilling valve stems

if you can center punch it ,it will drill iv done it, good drill bit and when it doles out put a new edge on it , carbide bit like he said,oyea at the time it goes though the other side be careful or go slow it will snap the drill bit at the end,
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Old 12-10-2008, 12:28 PM
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Default Re: Drilling valve stems

BK......if you wind up trying the RED method.......hit it with the drill quickly and hard as mentioned above, little by little and quench the bit between hits.
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Old 12-10-2008, 12:41 PM
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Default Re: Drilling valve stems

I had a similar problem a few years ago when I tried to order new valves for my 227 continental in my Fork lift...

They were a stepped valve being smaller on the end... After 3 tries I could get valves but not stepped to fit my rotocaps... They were Hard... So I anealed them by heating the ends and cooling Very Slowly... I just played the torch flame so they would cool Very Slow... I turned the ends down with a cobalt bit and cut new keeper Groves... It was only on the exhaust valves and only 6 of them....

I've done the same thing on valves for Gas Engines ect... Even threaded them...
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Old 12-12-2008, 05:37 PM
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Default Re: Drilling valve stems

Job's done, thanks gents, used the heat and cool slowly, centre punch, short drill bit helped too, and cutting oil.
Valves are now in my Stover ct2

BK
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