Carbide inserts and tools I use in my small cnc lathe. VCGT, DCGT and CCGT and others
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- Опубликовано: 3 июн 2023
- This looks at 35, 55 and 80 degree inserts and their uses in my workshop along with some inserts to be tested in the future.
Manufactured by Hercus in South Australia these lathes were sold to many technical colleges and countries all over the world. As technology has overtaken the lathes, mainly by later operating systems, they are to be seen more and more on the hobby market. Before the PC range of lathes, these machines were controlled by ANCA controllers and were called a Computurn. As a general rule, the castings and slides of a machine of this age are the same design as the later models and actually have higher quality lead screws. The mechanical sheet metal work on these models look different but the machine is basically the same. The ANCA’s were followed by a sheet metal work makeover enabling these machines to become a desktop version called the PC200. They used a PC as its controller. Over the following years the machines had little mechanical changes (other than their colour). The only exception to this is the mechanism for the automatic tool changer. The tool changer went from a “reverse lock in” type to a motorised worm and worm wheel gearbox type. This allowed faster bi-directional tool changing and addressed all of the shortcomings of the earlier version, which had to rotate a full rotation to select a previous tool. These lathes were made over a 14 year period and in a number of models sold overseas under the name of Rockford Pro 2000. An industrial version of the PC200 is the Novim, which comes with an industrial enclosure for coolant. 
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That close up camera quality is impressive.
That coated molded insert does a fantastic job in the aluminum closeup. Far less material sticking that I would have guessed!
Thanks Kevin, I am pleased with the camera, it works well for me I think. Which part of the video are you referring to? I don’t use moulded inserts. The three inserts shown facing the aluminium are actually Sumitomo inserts which have ground edges and 15 degrees of rake which means they are almost as easy on the lathe as aluminium inserts, just tougher. Thanks for the comment, Nigel
@@smallcnclathes I've never seen a ground insert with a coating before, so I assumed they were a pressed/molded normal insert!
That explains why they work so well.
I'm very excited to see the testing with that PCD insert. It looks like the design in it is a laser cut chip breaker?
Great video. Straight to the point with camera views that are so crisp and for a better word awesome!
Hi Joe, thanks for leaving a comment, they are really appreciated. Glad you like the videography, I took some shots with the iPhone to get slow motion, but it was just not good enough, so I got the lights and camera out and got those results. Nigel
Always such interesting, educational and entertaining content provided. Thank you. 👍👍😎👍👍
Hi Joel glad you got something from it. Thanks for your comment
That was interesting Nigel. Thanks. The comparisons made it very informative. For a non-machinist person, it really helps. Even if I do not know what profiling is. LOL But I enjoy learning. Have a good day.
Hi Gary, always good to get your comments, I appreciate it.
nice overview of insert shapes.
I'm really starting to like the 35° inserts in Aluminum and Brass, its so nice to be able to get that 45° chamfer on the back side and on my light machine they are more than sturdy enough for what I do.
Hi Klaus-Michael, are you using them in the made for aluminium type? So cheap and easy on low power machines. Nigel
Super introduction to carbide tips, it can be a mine field! Surprised you don't use polished and ground inserts more. I use the DCMT 55 deg polished inserts for everything on my little lathe, the positive top rake and razor sharp edge cuts plastic, stainless, brass, mild steel, wood, everything !!
Great video keep posting them.
Thank you, I have done videos suggesting inserts for aluminium are great for small lathes and in particular for steel. I have used them for steel quite often. They are amazingly cheap these days, those FC inserts from Sumitomo are about nine dollars each! Thanks for your comment
basically the bigger the insert angle, the stronger it is but also the more friction is produced on end-cutting edge - so 80° negative inserts (ex. CNMG) are good for heavy roughing and 35° positive inserts (DCMT) are good for thin-walled parts and undercuts, we use 80° for roughing (negative) or for internal turning with small clearance, finishing is always done with 35 or 55 degree angle positive inserts
Hi Adam, thanks for your comment. Nigel
I have been following your channel for over a year now and I thought I would take the time to tell you...
You put out beautiful parts and excellent videos.
I am an open innovation product developer (that's a ten dollar title for inventor) my work can be found on my personal channel "a handle on things" and my alternate channel "a more prepared life" if you get bored and want to see it.
I bought a Benchturn 7000 cnc lathe (small cnc lath) and have been teaching myself to use it by watching your videos.
Thanks a ton for putting in the time on the videos brother, lots of us are out here watching and waiting for your new videos to be released. (and watching all the older ones too)
Best Regards,
Shane from Wisconsin USA
Hi Shane, thanks for that. I have less parts to video now I have retired but things still crop up from time to time. Currently working on a video about my lathe and turning some 304 stainless bolts into some holding bolts with star shaped knobs fitted. I also have some ebay parting inserts to test and a PCD insert with a chip breaker, that should be fun. Again thanks for your comment. Nigel
ccmt, dcmt and tcmt are the mainstays in the shed for me. I do have a Chinese import parting insert that looks very similar to the Sumitomo, its a ground insert able to cut sideways. $18 for a box of 10 😂
Hi HM, any way of seeing what that parting insert looks like? Thanks for your comment
@@smallcnclathes emailed you, RUclips automatically deletes my comments that have links :/
3 things in succession, i was waiting for the fourth matching insert... threading, grooving tool, LH boring bar... annnnd...
trapezoidal/acme... conveniently, if you get a LH boring bar you only gotta cough up on one style of insert...
Thay last insert you had reminds me of an insert taegutec used to make but in a much lager snmg version, i think the grade was 5035 or something like that. Was awesome for roughing down if yoi got the feed over 1mm/r but they had a bad habbit of failing mid pass for no apparent reason.
I find my lack of hp makes life difficult. Getting the feed high enough for the chip breaker to work normally means no depth of cut so the chips still won’t break. Thanks for your comment.
Thanks for the video's, they are always informative and great to watch. Would you mind posting the tool holder types - just the first 5 letters would be great. I was mainly interested in the 3rd letter - the approach angle so I could relate that back to the clearance angles in the diagrams in the video. I'm in the process of buying a small CNC lathe and that would be very useful information! Thanks.
Hi Chris, I thought the 3rd letter was the tolerance. If by approach angle you man the angle between the insert and a turned face, it is 5 degrees
@@smallcnclathes It is for the insert according to the Engineers Black Book. The 3rd letter for the tool holder is described in the Engineers Black Book as the approach angle which they define as the angle of the cutting edge to the Z axis. Having said that, I think I have answered my own question - your tool holder for the VCGT insert would start with SVL - unless I have miss understood your drawing at ruclips.net/video/gnvEhDhwo98/видео.htmlsi=FYRcWxMv8-Sl-fhN&t=59 Regards, Chris
@@chrismayhew3651 sorry Chris I read it as letters for the insert in which the third letter is for the tolerance
I have no idea what the letters on the holder would be a all my tools are shorted to fit the turret and the letters usually are on the shank that get cut off. What cnc lathe are you looking at?
@@smallcnclathes No worries! I feel I'm on the right track thanks to your help, so much appreciated. I'm about to buy a Tormach 8L. It has a 1" bore, uses 5C collets. Am also ordering a small 5C collet 3 jaw chuck. Mainly intend using it to make small pins, spacers, shafts and bushings. 1.5 HP/ 5,000 RPM in high range 2,500 RPM in low range (when the 3 Jaw chuck or difficult to machine materials are being used and you need the extra torque). Regards, Chris