Small cnc lathe turns brass sphere with Sumitomo square end parting blade at 3000rpm
HTML-код
- Опубликовано: 31 окт 2019
- Proving a program I have written to help out a friend who has no turret on his lathe.
If you want more on Tool Nose Radius Compensation, find it here. • Tool Nose Radius Compe...
A little history of these lathes
Manufactured by Hercus in South Australia, these lathes were sold to many educational facilities and to countries all over the world. They were sold in the USA under the name of Rockford Pro 2000. An industrial version of the PC200 is the Novim, which comes with an industrial enclosure for coolant capture.
The lathes began as a “Computurn” model which used electronics by a company called ANCA. These lathes were stand alone cnc lathes, a small version of what might be found in industry.
These were replaced by lathes which had a Hercus control system and used an interface card in a desktop PC to connect with, and control the lathe.
These lathes used the same castings but their appearance was much changed as they no longer contained all the controls for the lathe. These were now all in the PC, apart from a small Pendant which offered some controls when in Manual mode.
Early PC200 models used a CAD/CAM software that ran in DOS on a PC that had an ISA slot (long discontinued on new PCs) and had analogue electronics. The 8 tool turret option on these lathe was operated by a small motor and gearbox and used shot pins to lock the tool in position.
As PC operating systems were upgraded, Hercus released Windows CAD/CAM software. These machines still ran analogue electronics. The last version of the machine used digital electronics and used 32 bit Windows based CAD/CAM. Both these machines used a turret with a motor and worm and worm wheel drive. Options for all these lathes included a Leader air chuck with no through hole, an air operated collet chuck, a 8 position tool turret, a tailstock, a QC tool post and a coolant pump. 
Хобби
Very informative. Something that I had never really thought about until now. Thanks for making and sharing this video.
Thank You, not something I normally worry about either. I have used this before, but usually just do it and not even bother to measure the result. I could have left it as was, this time too, it would make no difference to the part. I think it was a matter of once I could do it with the parting tool, I just wanted to get it right.
I imagine manual compensation is a thing of the past, except when driving a lathe like mine!
Thats quite remarkable.
Great channel!
Thank You
Great video. On the emco i have to useG 40, 41,42 to turn a perfect sphere. Without doing this you end up with displaced end points? I have to say I would use two tools,a round nose for the ball and a parting tool for the plunge cuts and parting off.
Strange you making bits for U.K. inAustralia,I am in UK and just shipped a batch of parts there! Crazy world.
I would do that too. The guy I wrote the program for, has to manually change tools (I was not making parts, just checking the code) As the sphere is just the exterior of a tiny valve, the shape is not that important. 300 parts made without a tool change is much better than 300 tool changes for a perfect sphere that is really not that relevant, in this case. Perfection is great when it can be costed into the part, but that is not always possible. Thank you for your input, what Emco do you have? My first experience of cnc was the tiny Emco PC5 Compact!
Program snd sir
Program cam or g71 program
Toolpath drawn in cad, imported to the software and the cam used to create the G code.