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INSTRUCTIONS FOR REMOVING CLUTCH

continued

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INSTRUCTIONS FOR TAPER TURNING

This attachment will turn r.1rPr wnrk up to 4 Inches per foot on diameter or 20° included an2le.

When tapering it i~ only nccc~~ilry Lo :act the guide bar at the reqqircd :inglc. The ~uiui.:: udr

i~ locked by 11wam of the ·1 nuts exposed on removing tht- plugs f• on) Lht! bar. The 2 Allen

socket head screw~ in the guid~ block shou ld also be lockd when tapering. The saddle screw

i$ loc:ited in the _guide block by ball thrust bearings, and being cclescop lc with its dr ivi11E pinion

pushes or pul ls the cro~~ ~lidc wich ic; rhus «dJU$L111i:nL Lo the cur c:in be m;inc- In rht' Mdi•'MY wily by means of the saddle screw handwhi:i:J ;'Ind dial.

There should be no b;'lckl;\~h on the sadd le $Crt!w nut~, ;'Ind ndjustment to thi:se t.an be rn;'lcif'

by grinding the setting plate. which 1s slottt::d to lift off. by merely slackening the 2 Allen fix ing

screws. Before doing th is the back lash sho..1 ld b1: 111e.1~urL•d by mcan.s of the saddle screw dial,

tak1ng into a"ount the backlash between rhP kPy ;ind keyway of the celescoplc joint. The saddle vcc guard can be re1nuvi:d by ~1,1Ckcning back the 1 grub -;crrws marked (A) on diagram.

which hold the guard fixing pins.

The knurled knob for sett111g the taper should only be used w1rh thP long gL1ide bar approx1-

ma.rely central with the sadd le screw. otherwise it will be difficult to operate.

IMPOR.TANT.-The swivelling guide bar and g'u de blor.k rmm bt> always locked by the two end

bolts and the 2 Al len screws after makmg a11y ndjust111ent rn it, f'vrn thoL1gh the caper attachment is not in use. as the bM takes t:hc thrust from tl1~ saddle screw.

If the motion h<1s been standing see that it is well <.:lt!dllt!d and lubrlc;iced before use.

SETTING Pl ATE FOR ADJUSTING NlJTS

I I ~.._~~~~--I I ·~~~~--~~~~~...&-

' I

L>~AN sM1T11 A r.~>.rr 11u B 19

TOOL RETRACTION AND AUTO NUT ENGAGEMENT

These two ehoracterlsti cs ore a feature of the 25 Pipe Lathe. In operation the engage button moves the tool forward too pre determined depth of cut, and the lead$Crew nuts engage automatically. When the length of thread hos been cut, o pre set limit switch mounted at the left hand side of the saddle automatically retracts the tool and disengcrges the nuh . The saridle is then brought bock to the start position. A further depth of cut is put on by the cross $fide handwheel, and the outomatic cycle is repeated .

The cam which operates the disengagement onrl retraction limit switch i& clomped to the bed shear and is provided wt th micrometer adjustment . Smal I increments of od!ustment should be made ofter every cut, so as to retract the tool eorller as the thread depth increases. Thereby protectiny the tool during thread run out .

Controls are situated at the front of the saddle and comprise o three position switch which ~on be set for retraction when cutting external threads, or internal threads, or a central position when the machine is being used for normal turning. The other two pushbuttons ore for cycle dart and hand or emergency retraction .

The amount of retraction is set by on adjustable screw locoted at the rear of the saddle at the end of the retraction cylinder. The amount of retraction should be the total depth of thread plus clearance, and must be $et before screw cutting commences.

II The operation is Pneumatic and is controlled electricolly. Solenoid valves mounted at the reor of the taper turning attachment ore used for operating both the retraCtion cylinder and the nut engagement cylinder.

The solenoid valves are the type which operate by a pilot air supply, the solenoid core being used to cut off or allow the air supply to operate the valve. An electrical relay Is housed in the some enclosure as the dol vdl ves .

REPLACEMENT VAi VFS Vl solenoid valve is used as purchased, but because of the pneumatic circuit design a simple change hos to be made to valve V2 as purchased .

If V2 has to be replaced proceed O$ fol lows:

1 . 0 Remove screwed plug 11A 11, and extract small rubber washer.

2. 0 Remove screws (2) and seporote valve at "B" . 3.0 Remove '0' Ring ond replace with rubber washer. 4 . 0 Assemble valve. ' 5.0 Discord 10 1 Ring and screwed plug . 6.0 Pipe as circuit diagram.

V2

DfAN SMllH 0. GRACE L TO B 20

RETRACT INTERNAL

NORfv\AL

TOOL RETRACTION AND AUTO NUT ENGAGEMENT

ENCAGE SCRtW DIS[NGAGE SCREW

TURNING __ _

RETRACT EXTERNAL

ADVANCF TOOL

CONTROLS FOR THREADING CYCLE

RETRACT TOOL

15

ELECTRICAL CIRCUIT DIAGRAM (See nrawing EL349)

14A L-..-~ ENGAGE SCREW ADVANCE TOOL

~ 21

V.2

23

THREAD CUTTIN LIMIT

SEl £:.CTOR SWI C

2~

V.!

L/ S NUT OPERATING CYLINDER

RETRACTION CYLINOCR

PNEUMATIC CIRCUIT DIAGRAM (See drawing 17885)

DEAN SMITll & CKACt LTD B21