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Drilling cutting edge

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john rennie

04-09-2002 11:26:40




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How can I make some holes in a payloader cutting edge? Tryed titaniam bits using low speed drillpress and different lubes,breakes chips from bits. Cutting torch wont cut it. very bad fumes with cutting torch.Sulfer steel? Need 1/2 inch holes for teeth.Cuts with abrasive wheel.Need help,different drill angle? Cutting fluid? Speed? thanks for any help.




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Steve U.S. Alloys

04-10-2002 14:32:43




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 Re: drilling cutting edge in reply to john rennie, 04-09-2002 11:26:40  
Hello John,
An airless gouging electrode works very well for this application. An AC welder at 150 amps with a 1/8" gouging rod will pierce that material easily. No special attachment is required. You should be able to buy it by the pound. There are many other good uses for it too. Everyone makes a pretty good one. If you want to look at mine it's our #1250. I'll include a link to the site for you. It's listed under both metalworking and cast iron. A few of the other uses are mentioned as well.
Steve

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Greg D.

04-09-2002 19:11:05




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 Re: drilling cutting edge in reply to john rennie, 04-09-2002 11:26:40  
The only drill that I know works is called a Hougen drill. Named for the people who make them. It looks like a hole saw with a center point mandrel to line it to your mark. They make a special drill press for them but they also make an adapter to use an ordinary magnet base drill. You MUST keep the drill press from moving. The magnet alone won`t do it. I usually use a "C" clamp on the base to hold it firm. The reason is the slightest movement while drilling and and it will shatter the drill. They are not cheap, but they work.

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Gen eDavis

04-09-2002 18:39:21




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 Re: drilling cutting edge in reply to john rennie, 04-09-2002 11:26:40  
We always used an air-arc/carbon torch for thus sort of thing in the mining industry.



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T_Bone

04-10-2002 00:02:17




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 Re: Re: drilling cutting edge in reply to Gen eDavis, 04-09-2002 18:39:21  
Hi John,

You can use a piece of carbon with a 12v battery. Put the postive lead on the work and the negitive lead on the carbon. Let it heat for about 30sec to a minute, let cool, as this will soften the steel enough to be drilled with a standard HS drill bit and leave the surrounding steel hard.

Depending on the thickness and hardness of the steel you may have to repeat this the deeper you go.

T_Bone

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