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Weldon Countersink.
| Chris Denton | 07/08/2014 19:11:45 | |
| 275 forum posts | How do these work? Tried to countersink a 12.5mm hole with a large one today and it just sat spinning in the hole, with no cutting happening? Hole was already countersunk a bit, does that matter? | |
| jason udall | 07/08/2014 20:04:14 | |
| 2032 forum posts 41 photos | If its not mullered.. If pilot hole too small...such that the " cross hole" doesn't touch... If pilot hole too large and all of cross hole in pilot. .. Either will lead to in effect a plain cone rubbing on the hole and getting nowhere.. | |
| Chris Denton | 07/08/2014 20:12:51 | |
| 275 forum posts | The bottom of the hole is in the pilot hole. Is that enough? | |
| Neil Wyatt | 07/08/2014 20:13:06 | |
 19226 forum posts 749 photos 86 articles | i have some cheap copies of these. I think the answer is one one of the suppliers' websites:
CRL Weldon Countersinks are known for their high quality unique designs and outstanding performance. They cut chatterless finished holes in aluminum every time. Smooth drilling action from a single cutting edge no matter what angle you cut at. The 1/4" (6.3 mm) shank diameter fits any 1/4" or 3/8" drill chuck.
In other words, don't expect them to do much in steel. My impression is that, for steel at least, they are OK to deburr or even chamfer a hole, but not countersink it. The geometry changes drastically as the tool enters the hole and you rapidly get to a point where it won't cut, and it just spins. I get better results with a cone on the end of a bit of silver steel, ground away to half the thickness, like a D-bit. Neil <edit> I love the marketing speak: 'single cutting edge for fast removal of stock' - it's like saying a Reliant Robin is faster because it only has three wheels. Edited By Neil Wyatt on 07/08/2014 20:14:35 | |
| Chris Denton | 07/08/2014 20:24:07 | |
| 275 forum posts | I was using it on aluminum!
This is the one:
http://www.rdgtools.co.uk/acatalog/HSS-COUNTERSINK-ZERO-FLUTE-25MM-30MM-HEAD-9457569.html#SID=39
As it says 25-30mm I would expect it to manage an M12 countersink at 26.9mm? | |
| Neil Wyatt | 07/08/2014 20:40:22 | |
19226 forum posts 749 photos 86 articles | Hmm, my countersink marked 10-15mm is for holes in that size range, not that size of finished countersink. It is about 20mm diameter. I consider them as deburring tools and they are often sold as such. The tool has to enter a few mm up from the start of the hole or it won't cut Is yours for countersinking 25-30mm holes? Neil | |
| Chris Denton | 07/08/2014 20:45:04 | |
| 275 forum posts | Possibly it is then. I will send them an email. | |
| Neil Wyatt | 07/08/2014 20:49:05 | |
19226 forum posts 749 photos 86 articles | Wikipedia seems to agree with me: Perhaps it isn't the best choice of tool for the task. Neil |
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All Forum Topics > Beginners questions > Weldon Countersink.