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Unread 03-12-2013, 05:53 PM   #1
leaky10
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Hole saw

Can anyone recommend a 4 inch hole bit for a drill. I true a bi-metal bit and it ground a very shallow and ugly grove in my bumper.

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Unread 03-12-2013, 07:35 PM   #2
thantos858
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What kind of material are you trying to drill through? The key is to go slow and use cutting oil if your going through thick metal. For a aftermarket bumper I personally would just torch the hole then grind it to clean it up.
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Unread 03-12-2013, 11:46 PM   #3
1222
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Just start with a sharp bi-metal hole saw. Drill a pilot hole first and then make a very shallow grove and stop. Add a liberal amount of cutting fluid (Rapid Tap is the best) in the grove and cut again going deeper. When it seems like itís not cutting then stop add more cutting fluid.

It will start to smoke but thatís normal. Do not over heat the hole saw or it will ruin it in quick order.
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Unread 03-14-2013, 06:34 PM   #4
cargo33
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Ive used A LOT of hole saws forbmy work an wen u get up to the 4 inch size its tuff to cut a decent hole with them an they groove like u said. Like mentioned already go slow if yor guna used it otherwise id recomend a torch or plasma cutter for a hole that size
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Unread 03-14-2013, 08:58 PM   #5
schitzangiggles
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With a 4" saw doing what it has done, I would drill a 3/8" hole on the edge and use a saber/jig saw and finish cutting it out.
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Unread 03-14-2013, 09:02 PM   #6
cargo33
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A saber saw would work an I totaly forgot a hand pumped hydrolic press would be the easiest. U maybe able to rent one at a tool rental store an that would b the easiest an make the cleanest hole asuming u could get it to fit in the spot yor trying to cut out.
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Unread 03-17-2013, 09:21 AM   #7
aguelzo89
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I have found that my fathers RotoZip worked pretty good when cutting circular holes into metal. Might wanna look into that?
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Unread 03-17-2013, 10:16 AM   #8
thantos858
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Quote:
Originally Posted by aguelzo89 View Post
I have found that my fathers RotoZip worked pretty good when cutting circular holes into metal. Might wanna look into that?
Biggest problem with a RotoZip type tool is the bits break if you force it at all plus the metal bits can get expensive.
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Unread 03-17-2013, 10:50 AM   #9
leaky10
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A lot of great info, probably should have include that I'm working with 3/16.
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Unread 03-17-2013, 11:25 AM   #10
schitzangiggles
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Oh then plasma cut it.

Or find a fab shop and see if they can do it fir you. I had to do it once or twice and it was @ $15 for both times IIRC.
any jeep clubs or farmers in your area?

http://www.jeepforum.com/forum/f346/
__________________
"Axeheads are supposed to be sharp, but you are one blunt tool."
FLynes



If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
-Samual Adams

A government big enough to give you everything you want is big enough to take everything you have.
Thomas Jefferson

Calling Illegal Aliens "Undocumented Immigrants" is like calling drug dealers "Unlicensed Pharmacists"

Nemo Me Impune Lacessit
"No one provokes (attacks) me with impunity".


"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

Mac Wilson
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