HARRISON M350 & M390 Lathes

2021-08-17 Harrison M360 amp M390 lathes

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HARRISON M350 amp M390 Lathes

Operation Maintenance amp Parts Manuals are available for the M350 and M390

M250 M300 M350 amp 390 M400 M450 M500 M300 Photo Essay

VS330 (Export Model AA) Older Harrison Models

Harrison 10AA (Chipmaster)

Designed in the early 1980s the Harrison M350 was to fit between the well-established (butapproaching ten-year old) M300 and M400450 lathes As a model its production life wasrelatively short and by 1998 it had been replaced by the almost identical M390 whoseswing in line with its model number was 390 mm whereas the swing of the M350 wasactually 380 mmTwo bed lengths were offered one gave 40 inches (1000 mm) between the centres the other60 inches (1500 mm) either version could be had with or without a gap and both wereinduction hardened With the gap section removed a piece of material 23 inches (585 mm) indiameter and 6 inches (150 mm) thick could be turned on the faceplate With 12 speeds in geometrical progression from 40 to 2200 rpm the geared headstock wasfitted with a cleverly-engineered speed-change system operated from a single dial centrallypositioned at the top of the headstocks front face The spindle able to accept a 2125-inch(54 mm) diameter bar was fitted with a No 6-D1 Camlock nose and ran in pre-loadedGamet super-precision tapered roller bearings Two types of drive system were offered oneintended for serious production and industrial use was driven by a 55 kW motor andincorporated a Matrix mechanical forward-reverse clutch on the headstock-input shaftcontrolled by a lever mounted on the right-hand face of the apron (exactly as the M400Model) The other system better suited to lighter-duty and training establishment useemployed a 37 kW motor with electrical operation direct through a simpleforwardreversing contactor - again controlled from the apron-mounted lever both latheswere fitted with an electromagnetic fail-safe spindle brake The headstock of 37 kW lathebeing lightly stressed relied upon splash lubrication whilst the more powerful model withconsiderably greater forces to handle was provided with pressure lubrication from a base-mounted pump and tankContinued below

1985 Harrison M350

ContinuedFitted with induction-hardened gears the dual Englishmetric screwcutting gearbox was ableto generate 51 metric pitches from 02 to 14 mm 56 English pitches from 2 to 56 TPI 20Module pitches from 02 to 35 MOD and 20 Diametral pitches from 8 to 56 DP 31 power-sliding feeds from 0018 mm to 12 mm were available in the metric setting and another 31from 00007 to 0048 inches per revolution of the spindle in the English the power crossfeed rate was arranged to be half the sliding rate The screwcutting gearbox was controlledby three smooth levers - that could be difficult to operate with oily hands - and a singlerotary selector an oil supply was held in the base and circulated by the simple but effectivemeans of the lower gears dipping into it and splashing it aboutThe carriage was fitted with a conventional spoked wheel for movement by hand (on somemodels this could be disengaged to stop it turning when power feeds were engaged) with the32 mm (126) diameter leadscrew (of 6 mm pitch or 4 tpi) engaged only for screwcuttingand additionally protected by a torque-limiter A separate powershaft provided the sliding



and surfacing feeds used in ordinary turning and facing A pushpull button was used toselect the power sliding and surfacing feeds with engagement by single lever in the middleof the apron that could be moved under light hand pressure no matter how deep the cutbeing takenAlthough a centralised low-voltage push-button control Station was mounted on theheadstock (that controlled the main motor spindle brake emergency stop and coolant pump)electrical control of the spindle was intended to be primarily from a lever attached to theright-hand face of the apron where it fell conveniently to hand and of course moved withthe carriage as a cut was taken Of the full-length type the cross slide and top slide (the latter able to be swivelled through360 degrees) were fitted with taper-type gib strips the handwheels were of the typicalColchesterHarrison semi-lever type with the micrometer dials (dual-readingmetricEnglish units were an optional extra) finished in non-glare satin chrome backlash inthe cross-feed could be adjusted out through the use of a (Colchester design) split nut andwedge Robustly built the tailstock was fitted with a 63 mm diameter (248) spindle with 140 mm(55) of travel and a No 4 Morse taper The spindle was engraved with ruler marks in eitherinch or metric graduations (or sometimes both) with a rotary micrometer dial fitted asstandardUnfortunately the stand through heavily constructed and complete with a splash-back wasfitted with neither a slide-out chip tray nor any sort of storage for tools accessories or workin progress - though this may have been an unlisted factory extraAn M350 weighed 1254 Kg (2759 lbs) in 1000 mm between-centres form and 1404 Kg(3088 lbs) as a long-bed 1500 mm capacity modelApproximate 88 inches (2240 mm) long in short bed form and 108 inches (2740 mm) as along bed the width in both cases is around 42 inches (1065 mm)

The cross slide was of the full-length type and both it and the topslide (which could be swivelled through 360 degrees) were fittedwith taper-type gib strips the handwheels were of the typicalColchesterHarrison semi-lever type with the micrometer dials(dual-reading metricEnglish units were an optional extra) finishedin non-glare satin chrome the cross feed screw nut could beadjusted to eliminate backlash



Fitted with a conventional spoked wheel for movementby hand the apron carried both leadscrew and power-shaft driven feeds the 32 mm (126) diameterleadscrew (of 6 mm pitch or 4 tpi) was engaged onlyfor screwcutting (and carried a torque-limiter) whilst thepowershaft provided the sliding and surfacing feedsused in normal work A pushpull button selected thepower sliding and surfacing feeds with engagement bysingle lever in the middle of the apron

With the end cover removed from a heavy-duty headstock M350the simple but effective rocking motor mount quiet-running non-metallic intermediate changewheels the V belt drive to theheadstock pressure lubrication pump (bottom) and long spindleclutch control rod are all clearly visible



The geared headstock provided 12 speeds in geometricalprogression from 40 to 2200 rpm all selected by a cleverly-engineered system from a single dial centrally positionedat the top of the headstocks front face

Clearly labelled and logically laid out headstock controlpanel Although a centralised low-voltage push-buttoncontrol Station was mounted on the headstock (which

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controlled the main motor spindle brake emergency stopand coolant pump) electrical control of the spindle wasintended to be primarily from a lever attached to the right-hand face of the apron where it fell conveniently to handand of course moved with the carriage as a cut was taken

The black cylinder in the picture above is the end section of the Matrixforward-reverse clutch fitted to the headstock-input shaft

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and surfacing feeds used in ordinary turning and facing A pushpull button was used toselect the power sliding and surfacing feeds with engagement by single lever in the middleof the apron that could be moved under light hand pressure no matter how deep the cutbeing takenAlthough a centralised low-voltage push-button control Station was mounted on theheadstock (that controlled the main motor spindle brake emergency stop and coolant pump)electrical control of the spindle was intended to be primarily from a lever attached to theright-hand face of the apron where it fell conveniently to hand and of course moved withthe carriage as a cut was taken Of the full-length type the cross slide and top slide (the latter able to be swivelled through360 degrees) were fitted with taper-type gib strips the handwheels were of the typicalColchesterHarrison semi-lever type with the micrometer dials (dual-readingmetricEnglish units were an optional extra) finished in non-glare satin chrome backlash inthe cross-feed could be adjusted out through the use of a (Colchester design) split nut andwedge Robustly built the tailstock was fitted with a 63 mm diameter (248) spindle with 140 mm(55) of travel and a No 4 Morse taper The spindle was engraved with ruler marks in eitherinch or metric graduations (or sometimes both) with a rotary micrometer dial fitted asstandardUnfortunately the stand through heavily constructed and complete with a splash-back wasfitted with neither a slide-out chip tray nor any sort of storage for tools accessories or workin progress - though this may have been an unlisted factory extraAn M350 weighed 1254 Kg (2759 lbs) in 1000 mm between-centres form and 1404 Kg(3088 lbs) as a long-bed 1500 mm capacity modelApproximate 88 inches (2240 mm) long in short bed form and 108 inches (2740 mm) as along bed the width in both cases is around 42 inches (1065 mm)

The cross slide was of the full-length type and both it and the topslide (which could be swivelled through 360 degrees) were fittedwith taper-type gib strips the handwheels were of the typicalColchesterHarrison semi-lever type with the micrometer dials(dual-reading metricEnglish units were an optional extra) finishedin non-glare satin chrome the cross feed screw nut could beadjusted to eliminate backlash









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HARRISON M350 & M390 Lathes

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