Has anyone tried these miniature carbide boring bars? Similar to the Micro100 tools. I could of done with boring a 13mm hole out earlier, nice and smooth plain bearing finish but don’t have a 13mm reamer. £13 seems cheap enough. Second question. How on earth do you hold a boring bar this small.
To hold it put a block of steel in the tool post then use the lathe to drill and ream to suit . That will put it dead on centre height. To hold it pinch bolts or preferably split it so it clamps
It depends on the method you use to hold your other bars. A reducing sleeve would seem like the obvious way.
Be very careful Brad, some of them have a lovely round shank (the Iscar ones) and others are oval and you need the dedicated holder.I have bought them in the past from a bloke called CNCpoorboy on ebay at a very good price. I just send him a message.
Often the shanks of these mini boring bars are not round so make sure any you buy are or if not you can get the appropriate holder. I have the WNT version of them and they are brilliant.
Lots of these are HSS, it is about the only HSS I use nowadays although I do have a DNMG HSS insert somewhere
For a 13mm hole, Id use an S07K-SCLCR06, they are cheap, ccmt06 inserts and a min hole size about 8mm. www.ebay.co.uk/itm/S07K-SCLCR06-7x125mm-Lathe-Internal-Boring-Bar-Turning-Tool-Holder-For-CCMT0602/293134555726 PH Horn are the ones to avoid, unless you like the challenge of making holders Its quite a simple holder. 5mm hole, 2.5mm hole and mill between. The difficult bit is finding an extra long series 2.5mm endmill, and drill bit. I did chip the big one and needs regrinding They are excellent. HSS in that size flaps around like a spring this hardly moves. PH Horn inserts are always a funny shape that is difficult to make a holder for, and holders not cheap.
