Small cnc lathe threading and shaking itself to bits

I always try to push my lathes as hard as I can. Threading at 3000rpm was really asking a bit much. The acceleration and deceleration of the carriage was shaking the whole lathe. The lathe weighs in at about 140kg, so not a very heavy machine. In this video, we look at threading at 3000 and work our way down to 1000 rpm.
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.

[TheKnacklersWorkshop]

Hello Nigel,
Cool secret tip there is offsetting the drill bit to create the chamfer...
Cheers.
Paul, ,

[jimsvideos]

I don't know if you could program a gradual acceleration on the lead-in (starting out of sync but being in sync before getting to the part) but if you can leave a groove at the base of the thread for run-out you could probably decelerate the carriage more slowly.

[landlifem]

Is your lathe bolted down ? Using the slower speed for threading is a good idea, looks like still a bit of shaking in the machine when peck drilling the hole? Can the hercus be tuned for accel/deccel in that process, ?

[WarGrade]

Is there not a setting for acceleration & de-accelerate if you have room for the extended movement after the cut and the chuck that is.

[bostedtap]

Interesting video, adding some concrete maybe?.
Thanks for sharing.
Best regards John

[CEKR]

I wonder if you could build a heavy stand and bolt it right to the concrete? Did you actually have any issues with it shaking other than that it's annoying though? I know full size cnc's shake pretty good during high speed machining.

[aly-tek]

Any room in the Base/Stand to fill with concrete?

[rengankrishnaiyer]

Hi Nigel, just wondering is it important to cut threads at 3000 rpm ?