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| Getting the most out of Carbide Inserts |
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| Darren:
Some of this will be old news to many of you, but for some, like me, it will be new.... :ddb: Having visited bogs recently I had one of those light bulb moments when I saw one of his lathe tools.. Carbide inserts are advertised as having four cutting edges, but I could never figure out how to use two of them, A pic tells all, buy a toolholder that turns the tip around !! There is another type as well. Most of us start with the one on the left, the right one is a SCBCR type. Whilst out doing my "duty" with the missus yesterday (Saturday) I spotted these on the market. Some diamond coated thingamajigs, a little like cut off saws. Don't the mind ever rest !!! I mounted one up to see if it would sharpen a tungsten tip. My "other" stones wouldn't touch carbide. merely polish the stuff. Here's a well abused tip, well no tip as its gone....please excuse the state of the toolholder, that's what happens when the carbide tip breaks and the toolholder rams itself into the work.... Using a small wedge to set the angles And here is the result, nice and sharp it is too. The grinding looks coarse, this is just the macro photography getting up close. Bear in mind how small an 06 size tip is. Add a slight radius to the nose Quite simply it worked, not only that it worked very quickly. The grinding is very fast and you need to be careful not to grind the tip away altogether !! Well, beyond any usefulness at least. I recon you could get away with a couple of re-sharpens at least. A nice cheap money saving tip...... :dremel: |
| bogstandard:
Good tip Darren (no pun intended), I have a load of those diamond cutting discs, never thought to use them in that way. The tips should make good 'roughers', leaving the new ones for fine finishing work. John |
| Stilldrillin:
Funny old world innit. :scratch: I was looking at a set of those discs, only yesterday! Decided I had no use for them....... ::) Hmmmm....... Thanks Darren! :thumbup: David. |
| Darren:
Bet ya al' thought dis ere' tred wa done fa didn ya..... :ddb: :ddb: :ddb: Nope, been down in the cellar again tonight whittlin' away at some old bit of steel. To start from the beginning, a nice new pack of these turned up this morning. You can see the 06 size on the left and some 09's on the right. Six sides and double sided as well so you can flip them over. Cost £2.00 for ten inc P&P from Ebay. These are quite a lot larger than what I'm used to and the current problem is I have no tools to mount them to. Add to that tooling in this size is expensive. So why not make something? This is an old tool bit that came with my Myford of many years ago. Well worn out and totally finished. Can you see a plan yet? :ddb: :ddb: :ddb: Milled a slab of the top front Drilled and tapped it to 3mm x 0.5, being very careful to put it on the right spot :thumbup: I made the thread slightly towards the back locating ridge to "pull" the insert nice and tight. Fitted the insert to check all was ok. Then scribed along the edge for the next stage. Setting the angle by eye. I use this HSS bit a lot, but it never seems to do any cutting :lol: Nearly done Take the pointy bit off Done !!! It's hard to describe just how well this worked, a pic just don't say it but have a look at these while I sort a vid out That's a 20mm steel bar, each step is one pass. And not particularly free machining either Nice chamfer, which is what this tool was made for. |
| Darren:
I forgot to say, it cut so well I made two more to make a set... Anyway, here's vid, sorry for the poor quality, only got my mobile phone. It's a plunge cut into a 20mm bar, no messing, cut like butter. I don't have a parting tool that works as well as this !! That's about 20mm of cutting surface.... |
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