Re: turret tool post for lathe

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Les Newell" <les@l...>
wrote:

> My Emco turret leaves the dc motor with power continuously applied

in

> reverse to force the turret against the stop. The current it the

motor is

> limited so it does not overheat due to being stalled. It sounds

horrible

> leaving a motor stalled like that but in practise it works very

well.

>
> Les
>

Emco used this method up through their model 220 production CNC
lathes. It works, but you are limited to very light cuts in the
direction where the cut force wants to rotate the turret against the
motor holding. In the direction where the force is against the hard
stop you are only limited by the machine's power.

Since these machines had a rear mounted turret, conventional right
hand thread cutting requires an upside down tool. This tends to
rotate the turret against the motor holding torque. Threading
anything coarser than about 14 tpi can require some creative
programming to cut from the headstock towards the tailstock (a real
pain).

Doug