control tailstock speed ?

**deadlykitten** · 07-01-2016, 11:34 AM

hello, is it possible to control the speed with which the tailstock comes in ?

there are :
.... R - retract position
.... A - approach position
.... E - engage position

i would like to control the speed between RA ; and not the key that swithces between 20..25% and 100% rapid ... kindly !

Similar Threads:

**deadlykitten** · 07-05-2016, 02:03 PM

On newer servo driven tailstocks, speed can be adjusted.

Hello mr Wizard ... please, from where ?

**deadlykitten** · 07-30-2016, 01:29 AM

i started this thread because :
... once i had the tailstock away from home position, and i was using it as a puller ... however, setting the machine to work like this tooked me too much time
... i heared that someone drills with the tailstock; do not know what drill size, but the idea remained

i had a setup on the lathe, that had some variations on Z_zero, and those variations were passed to the tailstock, so to correct the working position.

Z_zero variations were small enough, so retract and approach position, for the tailstock, were always the same.

this variables comes in handy (osp 300L ; variables are read/write ) :

Code:

VTSWP[ x ] - work     position from line "x"
VTSAP[ x ] - approach ... ... ...
VTSRT[ x ] - retract  ... ... ...
VTNOK[ x ] - Tailstock Advanced Confirmation "-OK" range
VTPOK[ x ] -  ... ... ... ... ... ... ... ... +OK ... ...
VTSSV      - NC Tailstock Position - Machine coordinate

editing these variables from code, for simple operations, is not necessary, but when it is, it means a faster setup

if speed between VTSAP and VTSRT can be controlled, than a drill cycle can be built up

**deadlykitten** · 06-05-2017, 04:13 AM

hello

shaving tailstock times

osp300

there are :
... R - retract position
... A - approach position
... E - engage position

1) R-A and viceversa
• distance
... distance between R and A as short as possible
... R <> Wmax
... R where turret can spin in its lowest_program_position ( not X- position ) at a safe minimal distance from the tailstock
•• speed
... speed for this palier is not editable by mere mortals

there is that key that delivers a fraction or 100% rapids

2) A-E
• distance
... monitoring is:
...... invalid if : [APPROACH] <= [WORK POSITION]+[+OK]+2mm
...... effective if : [APPROACH] >= [WORK POSITION]+[+OK]+[CENTER HOLE]+5mm
... [+ok]=0.5
... [CENTER HOLE]=0
... A = APPROACH
... E = WORK POSITION
... shortest_distance_AE=[+OK]+[CENTER HOLE]+5mm=0.5+0+5=5.5mm
•• speed
... #11 : adjust until it sounds ok

default value should do it

3) E-A
• distance : #13
•• speed : #14

... #13 must be corelated with tailstock thrust, and this can not be achieved by code
...... when disengaging, Waxis will move with speed #14 for #13mm, but the live center will move for a shorter distance
...... the difference between live_center_travel and #13 is the distance traveled by W after real contact, so to create tension until desired thrust is gained

... thus, adjust #13 until you are satisfied with live_center_travel; try 5 mm

again, 5mm for the live_center_travel involves #13=5+raise_tension_travel
... once shortest distance is gained, boost the speed for it by #14

kindly !

**deadlykitten** · 06-28-2022, 01:51 AM

hy

this is a quick update; some topics are not fully explained, but, for now, only listed as possible; as always, thank you mr wizard for all your help

for auto / NC tailstocks ( thus not for the manualy / turret assisted position adjusted )

is possible, in the end, to have a turbo tailstock :
... on acceleration may vibrate the sheet metal covers
... on deceleration, before clamping, may hit into the part ( just set the speed too high and end travel too short )
* so, up to these extremes, is still room to speed up safely

[ control panel : for rapid&feed speeds ]
... teach mode disabled
... rapid key 100%

[ tailstock table : for travels distances; go minimal ]
... negative/positive tolerance ( if face and center drill operations are stable, then 0.1 should be enough; increase value as tailstock pressure increases )
... aproach position ( minimal value is work + negative/positive tolerance + 5mm; 5mm is minimal setting for the torque skip, in case you wonder why )
... retreat, thus don't send it to positive limit unless otherwise collision occurs

if you speak code, then this is the equivalent :

Code:

    NOEX VTNOK [ LV04 ] = LV02             ( negative tolerance )
$        VTPOK [ LV04 ] = LV02             ( positive  ... ...  )
$        VTSWP [ LV04 ] = LV01             ( work     position  )
$        VTSAP [ LV04 ] = LV01 + LV02 + 5  ( approach  ... ...  )
$        VTSRT [ LV04 ] = LV03             ( retreat   ... ...  )

[ nc tailstock system para : behaviour right before/after clamping ]
i don't remember exactly which ones, but give a try at least for those highlighted in attached image; before make a backup photo/something

[ macros : faster setup and in auto-mode; ding for more infos/code ]
advanced :
... faster table & setup settings ( so to minimize panel operation )
... check position / detect faulty positions ( so to avoid a crash when tailstock is not where it should be )
... improve operation ( skip some useless things )
simple :
...backup/restore table data

[ interlocks / specs ]
... syncronize tailstock & turret movements
... ignore tailstock answer; general m ignore
... operate at rpm <> 0

hope you find this usefull; feel free to ask whatever you wish / kindly