Seeking A Tool
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While use in slow low-temp cutting with a hand pin-vise or small file is unlikely to cause major problems, diamond tools should NOT be used to machine-cut steel. The problem is that all steels contain CARBON, and Diamond is made of CARBON.
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At higher temperature (even microscopically) diamond chemically interacts with the carbon in the steel, slowly dissolving the diamond. It has nothing to do with hardness or wear, it’s a chemical reaction. The carbon in the diamond is attracted to the carbon in the steel, slowly destroying the structure of the diamond abrasive. Thus, do NOT use diamond abrasives in high-speed hand tools to shape or cut steel. Microscopically, the abrasion creates very high temperatures, speeding the destruction of the diamond. Such abrasives work fine with brass, aluminum, or other non-ferrous metals, and ceramics (tungsten-carbide), plastics, etc. Just not anything containing CARBON. Dan Mitchell ==========
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Fred Swanson
https://www.firemountaingems.com/itemdetails/h203233tl
Look near the front corner closest to the camera. Fred Swanson |
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mark_landgraf
I would advise NOT using diamond tooling. Diamonds are meant for sharpening hardened tool steel or carbide. The result would be a burr that would be fully clogged up. The filing action to which you describe would be far superior in metals suitable for drilling and maybe tapping. The file could be cleaned up with a normal file card or wire brush.
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WILLIAM PARDIE
Thanks Lester: Where did you get the hand held drill from? Bill Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Lester Breuer <rforailroad@...> Date: 10/30/22 6:16 AM (GMT-10:00) To: main@RealSTMFC.groups.io Subject: Re: [RealSTMFC] Seeking A Tool and if sharp an easy task. Lester Breuer Plymouth, MN |
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Hi,
For the small holes we are wanting to counter sink ... wouldn't it be nice if (WIBNI) we had a tool that was based on an abrasive technology rather than cutting. I'm thinking that a diamond coated counter sink - without any cutter - would do the jobs that I need very well ... and not run the risk of catching and chipping out the edge of the hole ... and not wear out (because it is diamond). - Jim in the PNW |
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mark_landgraf
You might try BenchmarkAbrasives.com
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They offer two 90 degree Countersink Premium Tungsten Carbide Burrs. Check out their SK-3 and SK-5. I regularly use the 5 on my drill press for a variety of sizes of hole sizes. With the high quantity of cutting teeth it acts like a file. No vibrations. Hope this helps Mark Landgraf
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spsalso
Just yesterday I used a cutting tool that is new to me: a device that cuts a countersink, and is designed to fit on a drill bit.
It did a superb job. In this case, I was countersinking 10-32 oval head screws in 1/8" nickel silver, using a drill press. I had already drilled a clearance hole using a #9 bit. It's made by Vernon Devices. Here's a link to their catalog (see page 13): http://www.vernondevices.com/pdfs/2010VernonDevicesCatalog.pdf They make these devices that will fit down to a #52 bit, so you can do 0-80 countersinking. What I liked about these is there was NO chatter, and the countersink was perfectly centered on the hole. They are not inexpensive. But, for this job, I needed perfection; and it delivered. I expect, over time, I will get other sizes. One nice thing is the bit is easily sharpened. Ed Edward Sutorik |
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Lester Breuer
Bill I have attached a photo showing the various ones I use when needed. All are turned by hand to produce a countersunk hole
and if sharp an easy task. Lester Breuer Plymouth, MN |
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Dennis Storzek
On Fri, Oct 28, 2022 at 08:09 PM, Nelson Moyer wrote:
I looked for a countersink for 2-56 flat head machine screws, but didn’t find one with a 45° angle.Point of information, 2-56 flat head screws have an included angle of 82*, or 41* from centerline. Metric screws use a 90* countersink, but that will only give a single line of contact with the steeper head. I happen to like single flute countersinks as they are less likely to chatter. But I see a problem... if you are using a Dremel drill press that means you are limited to a 1/8" shank, right? Countersinks this small have the shank the same diameter as the cutter diameter, and you need 3/16" for that #2 flat head (.162" to be exact) and any 3/16" countersink I've found has a 3/16" diameter shank. Sorry. Dennis Storzek |
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I just use a larger bit to make a small depression if cutting into resin or plastic, since the location is hidden from view so it doesn't have to look pretty. :-) On 10/28/2022 8:17 PM, WILLIAM PARDIE wrote:
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Tim O'Connor Sterling, Massachusetts |
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Try McMaster-Carr
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On Oct 28, 2022, at 8:17 PM, Scott H. Haycock <shhaycock@...> wrote:
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Scott H. Haycock
For that, you might look at one of those pointy Dremel grinding stones and do it by hand, or use a pin vise.
Scott Haycock
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Nelson Moyer
I looked for a countersink for 2-56 flat head machine screws, but didn’t find one with a 45° angle. Dremel has two conical point grinding bits that sort of work - #121 and #125. I’ve been using the #125 until something better comes along. I chuck it in the tool and place the tool in a drill press stand (ancient and no longer available), and drill with a very light touch until it ‘looks right’. The only thing I use flat head machine screws is passenger car coupler boxes because Branchline trucks won’t clear pan head screws.
Nelson Moyer
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io>
On Behalf Of WILLIAM PARDIE
Sent: Friday, October 28, 2022 7:18 PM To: main@RealSTMFC.groups.io Subject: [RealSTMFC] Seeking A Tool
I am seeking a counter sink drill for 2-56 + holes. Most of the ones that I come across are in sets and do not specify size.
Thanks for any help.
Bill Pardie
Sent from my Verizon, Samsung Galaxy smartphone
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Scott H. Haycock
Bill,
This is an example of the type I use for general work, although I have a set that has smaller ones. If you just want one, this is probably what you'll find.
I also have a set of these that I use on locomotive chassis, among other things.
https://www.micromark.com/3-piece-Center-Drill-Set
Scott Haycock
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WILLIAM PARDIE
I am seeking a counter sink drill for 2-56 + holes. Most of the ones that I come across are in sets and do not specify size. Thanks for any help. Bill Pardie Sent from my Verizon, Samsung Galaxy smartphone |
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