On Friday 23 June 2017 20:36:36 andy pugh wrote: > On 23 June 2017 at 23:57, Gene Heskett <[email protected]> wrote: > > So, is that default tool image, un-rotated, supposed to be a 60 > > degree included angle at its top tip, image? > > I don't think it is "supposed" to be anything. It's just a cone. It's > quite possibly a 60 degree cone, but why wouldn't you set up your tool > table with the actual real angles for your threading tool?
Its a very small insert that seems to a popular item for internal threading, and that I don't recall running across the full description. >From the size of the single tooth, I don't think its intended for threads below 22 tpi as it would be cutting, or smashing, the peak height of the adjacent thread. Something with an 08 in the part number IIRC. Pretty much at home for 27 tpi on up to 50 as I've used it at 50 quite a few times. Internal and external holders came as a set from a supplier on your side of the pond and use chips that are mirrors of each other IIRC. But I've no specs that give tooth height or tip radius profile, so the best I could do at composing a tooltype would be a SWAG. The holder sets the chip at about a 10 degree down angle, which I assume is a way for obtaining clearance under the cutting edge in small holes while maintaining a decent chip cross-section for strength, and I generally try to put the tip as centered vertically in the hole as my eyeballs say is centered. I could by choosing the right motions, start it in a 7/16" hole, but getting a usable retrace backaway that also clears the rear of the hole can be tedious indeed. Nice tooling if used correctly, but fragile if you try to use brute strength to dig a good sized piece of swarf out in one pass. I'll have read up on the tooltable and its allowable contents. Maybe I can make a pair of profiles that are usable. Another feature the tooltable should grow is a stop action snapshot triggered by the index pulse so that its backplot would only draw/show the tool offset at its position once per revolution. That way the backplot could actually show the thread pitch as opposed to the straight line the tooltip draws now. An added advantage would be the visualization of the tools incremental advance. You could see in the backplot it your attack angle is correct long before its too late to fix the code and salvage the part still in the chuck. Thank you Andy. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
