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/cgi-bin/YaBB.pl General Category >> The Cafe >> Drill a round hole in thin metal /cgi-bin/YaBB.pl?num=1484917216 Message started by Dave on 01/20/17 at 05:00:15 |
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Title: Drill a round hole in thin metal Post by Dave on 01/20/17 at 05:00:15 This is pretty cool....I have been drilling those 3 sided round holes for years - this might help! https://www.youtube.com/watch?v=4HOxfZKIZQk [media]http://www.youtube.com/watch?v=4HOxfZKIZQk[/media] |
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Title: Re: Drill a round hole in thin metal Post by Ruttly on 01/20/17 at 05:41:35 Learn something new everyday ! |
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Title: Re: Drill a round hole in thin metal Post by Kenny G on 01/20/17 at 06:47:15 What do you think the piece of cloth does? Kenny G |
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Title: Re: Drill a round hole in thin metal Post by MMRanch on 01/20/17 at 06:50:29 I watched the next one too ::) I've seen my share of those "3 sided holes " , so , the cloth helps keep the cutter "engaged" ... somehow ??? :-? I have done the trick of clamping the metal in between two pieces of wood , then boring it through --- but then ya got wood chips everywhere. Thanks for the Tip ! :) |
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Title: Re: Drill a round hole in thin metal Post by Dave on 01/20/17 at 07:09:06 I did buy a 3 pack of Uni-Bits that work really well for making holes in sheet metal - and that is how I have been drilling sheet metal recently.....they do make nice round holes in thin metal. (I really hate it when the drill bit grabs the thin sheet metal and throws it across the room). >:( |
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Title: Re: Drill a round hole in thin metal Post by justin_o_guy2 on 01/20/17 at 09:09:27 A piece of wood, a few screws,, metal secured, Unless it's small enough clamp. He didn't tighten the vise. For large holes, reshape the bit tip.A center point, relieved drilling edges, and the outermost part, winglets to slice . |
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Title: Re: Drill a round hole in thin metal Post by piedmontbuckeye on 01/20/17 at 10:19:58 1B202D3A2B273C3A2129243B480 wrote:
One thing my Dad taught me when I was a kid: NEVER raise the quill if the drill bit catches the part and slings it around as it could send it flying across the room - and sheet metal makes a nice flying knife! The other thing I learned from an old machinist (this was back in 1974 so I am the old one now!) is to put a little "flat" on each cutting edge of a drill bit and it will prevent the grabbing that happens on sheet metal. And it also prevents the three-sided hole! One day in a machine shop, I had to drill a ton of 1/4" holes in pieces of brass. I got a brand new drill, and it barely would drill w/o a ton of pressure. This old guy (who also had some "shakes" came by, and saw me having trouble. He took my new drill, went over to a bench grinder, and, even with some shaking, put these little flats on the cutting edges. I thought this was a joke, and this couldn't possibly work. WOW! When I started drilling again, it cut the brass like butter! A few years later in Tool & Die classes, I found out from at textbook the very technique that old fella taught me! It also works on other types of metal (like bronze and aluminum brass) AND, guess what? Sheet metal! |
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Title: Re: Drill a round hole in thin metal Post by verslagen1 on 01/20/17 at 14:08:13 A picture is worth a thousand words, so far you only 970 to go. :-? |
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Title: Re: Drill a round hole in thin metal Post by Kris01 on 01/20/17 at 17:30:48 I've never had that problem. I continue drilling once the bit has gone all the way through and it grinds/polishes the hole round. It also deburrs the hole...mostly. |
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Title: Re: Drill a round hole in thin metal Post by justin_o_guy2 on 01/20/17 at 17:56:30 I've drilled holes that a Mazda rotor would look at home in. |
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Title: Re: Drill a round hole in thin metal Post by Kris01 on 01/21/17 at 09:01:44 JOG, that took me a second to figure out. https://www.google.com/search?q=Mazda+rotor&num=50&tbm=isch&imgil=KSefvPAc-Ge_4M%253A%253Bd2WdpzkfyC8a8M%253Bhttps%25253A%25252F%25252Fwww.brandsoftheworld.com%25252Flogo%25252Fmazda-wankel-rotary&source=iu&pf=m&fir=KSefvPAc-Ge_4M%253A%252Cd2WdpzkfyC8a8M%252C_&usg=__S9mpE6Ag-5_ZJVum8QLqpRGuUOY%3D&biw=1600&bih=768&ved=0ahUKEwii5L2n29PRAhWE6IMKHbw-DucQyjcIRQ&ei=upODWKKfOoTRjwS8_bi4Dg#imgrc=_ |
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Title: Re: Drill a round hole in thin metal Post by zipidachimp on 01/21/17 at 11:33:42 as someone who always worked white collar jobs in factories, the coolest guys I ever met were machinists/tool/die guys! I toured a large stamping die plant in Butler Pa, a few decades ago, in spite of all the oil/steel/carbides flying around, this plant was spotless. Since carbide doesn't make sparks, punch grinding is done in small carpeted cubicles where 'listening' is part of the set-up!. cool! 8-) |
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Title: Re: Drill a round hole in thin metal Post by gizzo on 01/22/17 at 01:45:52 Cool trick. Thanks for posting the vid. Ill try that some time. I like those step bits for sheet metal. Too easy. |
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Title: Re: Drill a round hole in thin metal Post by piedmontbuckeye on 01/22/17 at 13:04:03 7A697E7F606D6B69623D0C0 wrote:
Better than being short and sweet and saying nothing! Or at least anything worth reading! |
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Title: Re: Drill a round hole in thin metal Post by verslagen1 on 01/22/17 at 16:45:08 Ok, found a better description of the mod and problem. basically, it happens because of the angled cutting face pulls the drill in. this chip will stop rotation unless it breaks off. causing the drill to jump and gets thrown out of axis with the hole. http://www.giangrandi.ch/mechanics/sheetmetaldrill/rakeangle.jpg the mod puts a small flat surface at the cutting edge so rather than being pulled into the material it scrapes along the surface. rendering smaller chips. |
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Title: Re: Drill a round hole in thin metal Post by justin_o_guy2 on 01/22/17 at 18:15:58 What we Really Need is an Engineer to explain it. Thanks V.. Still don't exactly understand how it can make a triangle,but I know it will, so, a flatspot it is.. |
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Title: Re: Drill a round hole in thin metal Post by Rtrnate1283 on 01/23/17 at 17:59:33 That's pretty interesting. Thanks for sharing |
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