Most small parts I just run a fine file against the corner of the rotating work to remove any burrs. I do have a 6mm HSS tool that lives in it's own QCTP holder that gets used if I need a larger chamfer, just ground 45deg on each side to meet at a 90deg point.

You nee dto set it at an aggle for a 45deg chamfer as the shape is 55deg on your DCGT inserts

Exactly what I use but a larger HSS blank to suit my tool post.

Tony

If you do want to go the insert route then Glanze (Chronos) do a similar holder for the CC*T inserts that will give you almost a 45deg chamfer on either side

The problem with the insert ones is you can't get a decent internal chamfer on anything much less than 25mm dia without the holder/insert rubbing, with HSS you can grind clearance on the side that gets used for internal cuts

Oldmart how do they do 45deg chamfers without swinging the tool post around which is what the OP wants. His main tools of choice for general turning are already DCGT 07

I think the "bluntness" referred to by the OP is the cutting edge of the SCMT insert, not the nose radius. SCGT inserts, primarily for non-ferrous metals, are considerably sharper on the cutting edge.

Yes I understood it was the "sharpness" of the edge all along as it was me who first suggested to Doc that he try the **GT inserts and one only has to look at his other threads to see they are almost exclusively what is being used. They are ideal for small fine parts on lightweight machines. So in this case the inserts being sort do offer an advantage

As the tool is being used mainly for cutting chamfers the tip radius in this case is irrelevant as it's the edge being used

Tip radius is more to suit the part, again with the small parts being made a 0.2mm tip radius leaves the smallest internal fillets when turning to a shoulder and required the least relief of a mating holes edge. The other tip radii can be made good use of when a larger internal fillet is needed such as shown yesterday in my "Progress" thread

Although the SCGT0202 and 04 can "be found" on google I could not see a source that was easy to buy from in the UK and preferably in less than a box full at commercial prices.

Edited By JasonB on 30/03/2023 07:38:36

The smallest I found here in NZ uses the 09 square insert, in a 12mm shank holder. I relieved the lefthand side of the holder and it allows both inner and outer edges to be broken. The 09 supplier here has both sharp Al inserts and the regular steel inserts as well..With the Very sharp XXGT inserts available these days, needing to make hss tools is now down to only shapes that a standard insert does not cover.

EDM wire cutting is probably at it's lowest cost per mm at the moment, and a friendly shop with a wire edm, may do a special shaped tool for a box of beer.