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01-18-2009, 01:55 AM | #1 |
RCC Addict Join Date: Jan 2007 Location: San Jose
Posts: 1,697
| ### Where to buy "Counterbore" tool. ###
this is opposite of countersink tool. Used for making socket head cap screws flush.... Where can I buy one that make 2, 3, 4, mm holes? thanks |
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01-18-2009, 06:15 AM | #2 |
Quarry Creeper Join Date: Nov 2007 Location: NH
Posts: 427
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you could try here http://www1.mscdirect.com/CGI/GSDRVS...00000081527442 or here http://www.mcmastercarr.com |
01-18-2009, 09:02 AM | #3 |
Pebble Pounder Join Date: Dec 2008 Location: San Jose
Posts: 197
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A "counterbore" tool is just an endmill. They are not something that can just be thrown in a drill press and used. The part needs to be securely fastened down in a vice or clamped, and them the tool running at a pretty decent speed, usually over 1200rpm for aluminum and fed into the part very slowly. If you are not careful, it will grab the part and royally damage it. |
01-18-2009, 09:30 AM | #4 |
Built, not bought Join Date: Oct 2004 Location: Gresham
Posts: 4,504
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Actually,they do make counter boring tools. Only problem I see is that they are not cheap. |
01-18-2009, 09:38 AM | #5 |
Rock Stacker Join Date: Sep 2007 Location: east mich
Posts: 49
| try www.wttool.com |
01-18-2009, 09:51 AM | #6 | |
RCC Addict Join Date: May 2008 Location: Green Bay
Posts: 1,138
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That is correct but also incorrect. With the proper Counter bore tool you can use a hand drill. The have a "guide" that fits in the drilled hole and centers the tool. You can also use a spot face tool. I use a 7/8" daily at work for locating BAVA vibration probes using a Milwaukee cordless drill. http://www.mcmaster.com/ 3mm- $10.64 4mm- $13.92 Last edited by reddevildemo; 01-18-2009 at 09:54 AM. | |
01-18-2009, 10:16 AM | #7 |
Pebble Pounder Join Date: Dec 2008 Location: San Jose
Posts: 197
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Well, up to you guys, still had better have that part clamped down solid. I would still be pretty hesitant to try and counter bore the full depth of a 3 or 4mm socket head into aluminum by hand, but for those that want to try, here are the part numbers at www.mcmasters.com- 3mm - 29445A21 4mm 29445A22 |
01-18-2009, 11:22 AM | #8 |
RCC Addict Join Date: May 2008 Location: Green Bay
Posts: 1,138
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Sorry Darksoul, you're correct on having the parts held tight, clamp, vice something. I was more referring to using a hand drill if needed. My bad.
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01-18-2009, 11:24 AM | #9 |
Picky Fab'r/Acetal Junky Join Date: Jul 2006 Location: Arizona Desert/AJ
Posts: 3,073
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Why don't you just use a standard drill bit? I have used drill bits for countersinking those "square headed" cap screws many times...and it works great. Plus, typically for the price of an end mill, a drill bit set is far cheaper and you have the multiple different sizes available to you.
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01-18-2009, 11:40 AM | #10 | |
Built, not bought Join Date: Oct 2004 Location: Gresham
Posts: 4,504
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01-18-2009, 08:24 PM | #11 |
I wanna be Dave Join Date: Dec 2007 Location: Not here
Posts: 2,814
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Step drills work great.
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01-19-2009, 05:03 AM | #12 |
Quarry Creeper Join Date: Nov 2007 Location: NH
Posts: 427
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I'm not sure what 5150bronco has in mind for these, but a drill is by no means the same thing or for the same purpose as a counterbore. A drill bit will not leave a flat surface for the bolt to tighten up against. That is the whole purpose of the counterbore, its not to drill a hole , but to ream the holes bottom end to allow the most surface area between the bolts head and the piece being bolted. Also a counterbore shares some of it features with an endmill but it is not the same thing, as stated above a counterbore has a pilot to align the bore/counterbore.
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01-19-2009, 07:40 AM | #13 |
No idea what I'm doing Join Date: Oct 2008 Location: Underground, CO
Posts: 4,529
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You can get a set from Grizzly too. I don't know about the quality though....we buy ours from MSC. True these aren't endmills, but true you should firmly clamp your workpiece to use these properly. That being said...........I have used these in a handrill before. Not the best practice, but sometimes you just need to get something done. Many times though if the work is held secure, I'll just use an endmill. I did a lot of that on the chassis I'm working on: Yet another PSC Build Oops.....I just noticed these are for standard SHCS....not Metric. Sorry Last edited by C*H*U*D; 01-19-2009 at 07:43 AM. |
01-19-2009, 07:46 AM | #14 | |
Picky Fab'r/Acetal Junky Join Date: Jul 2006 Location: Arizona Desert/AJ
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01-19-2009, 08:17 AM | #15 |
I wanna be Dave Join Date: Mar 2008 Location: Wayne county. PA
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when i'm doing my flintlock build i bought some countersink bits in 4 sizes from #4, #6, #8, and #10 wood screws....but they have been working for any screw that needs to be countersunk ..............bob .... Last edited by bob1961; 01-19-2009 at 01:35 PM. |
01-19-2009, 01:33 PM | #16 |
RCC Addict Join Date: Jan 2007 Location: San Jose
Posts: 1,697
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Okay. So, what I am trying to do is similar to countersinking. I want to make a hole in skid plate so I can use socket head cap screw to mount tranny. circular hole not cone shaped (like countersink). Thanks for all the reply's. Hey Offroader........, where can I get that particular drill bit to fit 3mm cap screw? Last edited by 5150bronco; 01-19-2009 at 01:37 PM. |
01-19-2009, 01:36 PM | #17 |
RCC Addict Join Date: Jan 2007 Location: San Jose
Posts: 1,697
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this is what i found at rutlandtool.com Robert Charles 3.4mm Dia. 3-Flute Metric Cap Screw Counterbore $21.84 part # 11673500 will this work? |
01-19-2009, 01:39 PM | #18 | |
RCC Addict Join Date: Jan 2007 Location: San Jose
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01-19-2009, 03:39 PM | #19 |
Rock Crawler Join Date: Apr 2008 Location: On the Snap on truck
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I got a set off of ebay for $30,I am not sure if I have 2mm in my set but I can check when I get home, I used them with the part in a vise and a hand drill, no problem , I had mad my own that kinda worked on alum , I took a busted drill bit and my dremel and cut a notch about 1/4" from the tip of the bit, then ground the bottom part of the bit off, like the guide part , it was soso, not nearly as clean as the actual thing, but when your in a bind you find ways to make things work |
01-19-2009, 05:12 PM | #20 | |
Picky Fab'r/Acetal Junky Join Date: Jul 2006 Location: Arizona Desert/AJ
Posts: 3,073
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I can't tell from the description if that cuts a 5mm or 6mm counterbore. If it cuts a 6mm hole, it'll be good for the 3mm hardware...but if it cuts a 5mm, the head of the 3mm won't quite fit. | |
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