Drilling Spot Welds, What do you use? |
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Drilling Spot Welds, What do you use? |
obscurity |
Apr 15 2010, 08:09 AM
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#1
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Member Group: Members Posts: 411 Joined: 24-February 06 From: Atlanta ,GA Member No.: 5,628 Region Association: South East States |
I have been drilling spot welds as I work on my car and it occured to me that there may be a better way (or maybe I am being to picky). I am curious what everyone else uses.
I have been using a spot weld cutter. It looks like a short drill bit with a pilot point and little cutters along the edge. It will cut through the top layer or steel but not the back layer (usually). They will cut about 10 welds before being hoplessly dull. When I was buying them at $5/bit it was fine but that company went out of business and the ones I find now are $25/bit. Are these the right tools to use or should I be just using a drill bit allthe way through the weld. Any help or tool suggestions would be appreciated. (IMG:style_emoticons/default/smile.gif) Thanks, John W. |
rjames |
Apr 15 2010, 09:00 AM
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#2
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I'm made of metal Group: Members Posts: 3,974 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest |
Would cutting fluid help with keeping the bits from getting dull?
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Superhawk996 |
Dec 25 2019, 08:36 AM
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#3
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914 Guru Group: Members Posts: 5,916 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Would cutting fluid help with keeping the bits from getting dull? Yes. In addition, many times when a bit goes dull early (and 10 is early) the bit is being spun to fast and/or too much pressure is being applied. This creates excessive heat at the tip of the cutting edge and it rapidly goes dull. The bits are made of High Speed Steel (HSS) which is just common tool steel and isn't particularly tolerant to being overheated. Carbide rotatry broaches cut faster and will be more tolerant of heat but they are way more $$. Slow the drill down and don't push as hard. Once it gets dull the natural tendency is to try to speed up and/or push harder, this just dulls even quicker. Change to a new bit and SLOW DOWN! |
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