Even so, the box is remarkably reliable and, if oiled generously, will not little trouble. It is suspected that, while Boxford fitted a different gearbox to the earlier VSL models with the L00 spindle nose, this practice was discontinued and later editions of the manual not updated to reflect the change. Metric: RPM =1000 x cutting speed / pi x D (mm) where D is your tools diameter in mm. ISO metric trapezoidal screw threads standard, ISO 2904 - 1977, describes the system of general purpose metric threads for use in mechanisms and structures. Should you have a later example, please do let the writer knowThe various models - specification details:Model VSL (4.5-inch centre height) & Model 500 VSL (5-inch centre height)Introduced as a 4.5-inch centre height machine in January 1966 (from Serial No. Both slides of the compound rest were driven by 10 t.p.i Acme-form (or 2.5-mm pitch) screws fitted with 1.6-inch diameter, satin-chrome zeroing micrometer dials - the friction setting of which could be adjusted (or locked) by a pair of by socket-headed screws that bore against spring-loaded balls.In January 1950 the flat-belt drive was abandoned, with lathe No. If this is done it is worth bearing in mind that, while the main motor can be easily altered from "Star" 440 volt to "Delta" 240 volt working, many of these machines were fitted with both a push-button safety starter of the front panel and another "automatic" contactor unit at the rear. Ambitious advertising in the model-engineering press of the day attempted to position the CSB as an alternative to the Myford ML7; unfortunately, the Boxford cost nearly twice as much and, while it did offer a range of advantages, there can have been few takers. Holemaking Even today, in confirmation of these numbers, a small but regular supply of these well-made little machines turns up on the second-hand market. New, high-quality machine-tool specification belts (which we can supply, just email for details) can make a significant improvement to the smooth running of any machine tool. By paying 3 : 10s : 0d extra the motor and countershaft could be fitted with 2-step pulleys when the speeds became: 38, 55, 75, 87, 110, 125, 175, 200, 250, 285, 400, 450, 570, 650, 900 and 1300 r.p.m. For the first time Boxford offered as an option what they described as "chrome hardened" beds - though few such can have been made judging by their paucity on the used market. As a point of interest, these were not the only Boxford precision lathes for another type, a considerably larger 4.5" x 17" machine, was built in small numbers from 1958 until the early 1960s. 11-33000) as a 5-inch model (the "11" prefix indicated the Mk. Not all controllers support all G-Codes. You cant change an Imperial (inches) program to Metric just by sticking a G21 g code on the front of a Metric g-code program. The final type, and found on most machines today, was a simpler arrangement of two bolts - one at the front and the other at the back of each foot. With a single-pulley drive on motor and countershaft, and using backgear, the eight spindle speeds were: 38, 55, 87, 125, 200, 285, 450 and 650 r.p.m. Unfortunately the makers neglected to mention the fact that, in order to run on top speed, a more powerful and expensive motor was required. These lathes were distinguished by a more modern-looking stand complete with a neat splash-back, a standard-fit low-voltage halogen light unit and a rather elegant grey and brown finish. 4600 in 1954, used an "integral" countershaft unit of unusual and ingenious design where the pulley system and motor were both mounted on a platform that could be adjusted forwards and backwards on two bars fastened to the back of headstock-end bed foot. If possible, use a feeds and speeds calculator or CAM program that properly accounts for these effects. A useful addition was a spindle lock, operated by a dished chrome-plated button on the face of the headstock; this greatly eased the removal and fitting of chucks and faceplates and obviated the need to use, and possibly damage, the backgears. 2 BUD 269 kg (595 lbs)Model CUD 254 kg (560 lbs) Model Mk. However, in later years, with the development of under-driven versions (with a belt running down the front face of a now wider headstock) a change was forced back to the original layout. The angular velocity of the workpiece for an example using metric values, where the cutting speed is 30 m/min and a diameter of 10 mm (0.01 m), Free Advanced Machinist Calculator for Speeds, Feeds and more; In addition, because the power-feed drive was taken from a key running in the slotted leadscrew, the thread in the latter was needed only for screwcutting, so preserving its accuracy and saving wear on the expensive clasp nuts. Besides the conventional V-belt drive already described, the lathe was also marketed as the comparatively rare VSL with expanding and contracting pulleys giving a useful mechanically-operated variable-speed drive system.Later Under-drive lathes of all versions enjoyed a number of refinements and are known as the "Mk 2 Under-drive". The rear-drive system usually gave 4 speeds from around 200 to 1200 r.p.m. With the drive now held securely in the stand behind an electrically interlocked door another advantage emerged: the depth of the machine was reduced to as little as 17-inches (400 mm).Early under-drive lathes had their countershaft-spindle bushes pressed directly into the material of the motor platform itself, with the belt-tensioning handle mounted externally on the left-hand side of the cabinet. Very slow loading of JavaScript file with recent JDK Youve found our simple free online Feeds and Speeds Calculator that uses the classic formulas taught in shop class. Drill bit sizes Newznab is a standardized API used by many usenet indexing sites. A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. It will be money well spent.Tony Griffiths.. If you buy a gearbox-equipped lathe that appears not to generate the pitches shown on the screwcutting plate check the special manual produced by lathes.co.uk, it shows all the ex-factory arrangement of the changewheels.One less-commonly found accessory offered for the late-model VSL lathes was a full height cabinet on the right-hand face of the stand that held a set of C5 collets and the necessary draw bar.Early models of the VSL used a mechanically driven rev counter that was not entirely accurate; later models had an electronic version that, in the writer's experience, is spot on.All the gears necessary to generate metric and other pitches are now available at a good saving on the factory price.Model ME10In November 1976 Boxford began to market 5" x 22" Model ME10, a less expensive lathe - though constructed from components identical to machines higher up in the range. According to Work's literature seen by the writer, at the same time the tumble-reverse mechanism was altered: the inconvenient and slow-to-change bolted-up arrangement being replaced by a simple, quick-action, spring-loaded plunger design (though it's a fair bet that the change was not immediate and some lathes might have had the old parts fitted). 2 Morse taper) and both top and cross-slide feed-screws (actually from Machine No. As the inverter provides a variable-speed output it will, if coupled to more than one motor - the suds pump for example - vary the speed of both. That means the impact could spread far beyond the agencys payday lending rule. G-Code mappings. Could Call of Duty doom the Activision Blizzard deal? - Protocol of the ordinary rear-drive models and the 40 to 1400 r.p.m. 2 Under-drive machines were introduced). A further advantage was that the bearings could be replaced easily and, if required, much higher spindle speeds reached with reliability. The lathe had its origins in the Denford Small Tools Company (D.S.T. It can only cover 2 variables. The leadscrew will also need to be swapped over, or the existing one modified to fit the gearbox, and a slot milled along its length to drive the apron worm wheel. Standard changewheels can be purchased online here, the 100/127 metric transposing gears here and the 127/135 metric-to-inch transposing gears here. Feed refers to the rate of movement of the axes of your machine, it is programmed in inches per minute (IPM) or millimeters per minute for metric. Of course, doing this means that the safety-interlocks on doors and backgear are lost and other arrangements have to be made to power the coolant pump and light unit*.Fitted to a distinctly different stand, and with a 5-inch centre height, the final version of the VSL was known as the Model "500 VSL" and, unlike most Boxford lathes, the model type was clearly identified by a large badge on the headstock. An interesting point concerns VSL models fitted with the L00 headstock spindle: on these lathes a screwcutting gearbox was standard - but some had different internal ratios and the English/metric and metric/English conversions gears arranged to be more compact with pairs of 64/54t and 76/65t respectively instead of the usual 127/110t (inch to metric) and 135/127t (metric to inch) gears. Shorn of screwcutting equipment and usually, but not always, backgear as well, this model was aimed at the school and college market and had - apart from its low price - little appeal for the model or experimental engineer. Although Harrison owned Boxford, only export versions of the lathe ever carried a dual Harrison-Boxford badge - oddly, even into the 1960s and the Mk. G- Material Growth: The amount of material that is 1791 to become the first fitted with 4-step V-belt drive - a much-improved arrangement that gave a more useful bottom speed (ideal for screwcutting by beginners) and a total of 16 rather than 12 speeds. Bored through 0.75" (on all models save for the later VSL with its L00 nose) the spindle, as mentioned before, ran in expensive "precision" Timken taper roller bearings (though cheaper but just as effective standard ones were to be used in later years). and then, if that does not affect a cure, removing the countershaft pulleys and shaft and statically balancing them between a pair of lathe centres. The first batch of 'Box Ford' lathes produced by Denford during 1948 at their Box-Trees Mill plant at Wheatley, near Halifax in Yorkshire, England. With supplies of such machines yet to be available again from the German factories of G.Boley, Lorch and Leinen, and with Schaublin in Switzerland no doubt running flat-out to meet outstanding orders, the lathes were priced at an astonishingly high 175 (when a backgeared and screwcutting ML7 was around 60 and a 5-inch Raglan with screwcutting gearbox 144). It is believed that Denford moved at least part of their operation to a former spinning factory, Box Tree Mills, in Wheatley, Halifax during the closing years of WW2 (1939-45). Boxford's careful control of production costs has, however, done every subsequent owner a considerable favour for, providing that the lathe has its original set of changewheels the addition of a few more produces, at little cost, a dual metric/English screwcutting machine. The rear-drive lathes remained in this new V-belt drive form until 1959 and the introduction, from approximately Machine No. Our G-Wizard Feeds and Speeds Calculator covers 60 variables! Login will be temporarily unavailable due to planned system maintenance on Nov 25 2022, from 12:30 AM to 02:30 AM PT (08:30 AM-10:30 AM GMT, Friday) If the lathe has a gearbox, leave it in place - and try not to remove a lathe from an under-drive stand; a compound was used to stop coolant getting into the wrong places and effectively sticks the lathe down; once broken the hardened sealer has to be chipped off, the faces carefully cleaned and the joint remade.Notes on Lathes Fitted with 3-phase MotorsIf your Boxford has a 3-phase motor the best conversion is to run it from a variable-speed inverter; these are wired direct to the motor and replace the lathe's conventional electrical controls. 12419 in January, 1963) fitted with ball-bearing thrust assemblies, the inner and outer hardened plates of which, over time, can become indented and give the action a "gritty" feel.. CNC Programming with G Code: Definitive Free Tutorial [ 2019 ] To date, the earliest catalogue found is a well-produced folder with a cream-coloured cover in card holding twelve sheets (secured with split pins) showing all three models, A, B and C, together with a range of accessories. A simple feeds and speeds change in the gcode will handle it far faster than re-running the CAM, assuming were capable of making such simple changes. counter (later a mechanical one) was fitted to show the operator what was going on (later versions were wired direct through the Forward/reverse switch, earlier types through a contactor, then through the forward/reverse switch). Probably made as a one-off to satisfy an order from the Post Office Research Station at Dollis Hill in London, the assembly consisted a block, fastened to a machined surface on the face of the headstock, that contained an indexing plunger - this engaging in a ring of holes drilled into a large disc mounted on the end of the headstock spindle. fundamentals-of-modern-manufacturing-4th-edition Beds until the advent of the Mk. The "swing head" that carried the 4-step "A-section" V-belt was tightened and relaxed by usual right-and-left-hand threaded hexagon block fitted with a rather short and so awkward-to-manipulate ball-ended handle (the same fitting can be found on the original1933 South Bend). The lathes all had 3-step, flat-belt final drive and the compound slide rest was fitted with small diameter micrometer dials--exactly like those on the South Bend 9-inch from which the lathe was copied The countershaft was an integral unit of unusual and ingenious design where the pulley system and motor were both mounted on a platform that could be slide forwards and backwards on two bars fastened to the back of the headstock-end bed foot - the movement being activated by a quick-action thread controlled by a handle that fitted onto the hexagon end of a shaft that protruded through the bed foot at the headstock-end of the lathe.. First known mention, in 1947, of the "Box-Ford" 9-inch South Bend copy.Note the caveat about obtaining raw materials and the wording, designed to appeal to the critical export market. This allowed a separate adjustment to be easily made to the motor-countershaft belt tension. 01mm increments until you get a reading on the ohmmeter. Most schools resorted to bolt-on straps and similar Heath-Robinson approaches and, as a consequence, in 1959, Boxford introduced the "Under-drive" models, a design very similar to the competing Viceroy and as already offered for many years on the American market by South Bend, Clausing, Sheldon and other mankers. The answer is - the apron. or, with backgear fitted, an additional 5 slower speeds. Early examples of the CSB were different, and fitted with the novel, quick-action belt-tensioning device used on the lathes of the late 1940s - probably another case of using up no-longer-needed spares. 3 Morse taper tailstock and mounted on a safe, completely-enclosed under-drive stand. Bobs Cnc Feed RateFeed rate = RPM N Teeth Chip load in direct (belt) drive. CNC Lathe Talk . speeds and feeds calculator Unlike the 112 Model C, which lacked a motor in the basic price, the CSB was delivered complete and ready-to-run (with a just-about-adequate 1/3 h.p. Later, only the two longer beds were offered, the 16" option being consigned to the cheaper CSB model. This weakness (from a safety point of view) was removed when the mechanism was redesigned and made accessible only by opening the door. motor) for 105 - a total saving of some 16 : 5s : 0d. In 1960 the countershaft was modified: the shaft diameter was increased to 0.75" and, in 1966, further improved when the shaft was increased to 1-inch diameter, the bearings fitted to removable brackets, the belt-tensioning lever repositioned within the cabinet base and the access door (like the educational versions) provided with a micro-switch that stopped the motor should it be opened by even a fraction of an inch.While rear-drive lathes had 6, 8 or 16 spindle speeds all the under-drive machines, with the exception of the variable-speed VSL, were limited to 10. First, install the motor as far back on its mounting platform as possible (you may need to drill new holes in the plate) having first checked that there is still enough room for the belt-tensioning rod to function properly. The Machine Tool Operator determines proper feeds, speeds, tooling, and operation sequence or selects those prescribed in drawings, blueprints, or layouts). Other machine tools made included a useful little shaper (copied from a South Bend original), a tool and cutter grinder (also sold under the Union and Harrison names) and a variable-speed vertical milling machine.Continued below: Continued:Following the two early precision lathes, the company's next model, introduced in 1948 and again branded a "Box-Ford", was an improved copy of the Pre-WW2 American South Bend "9-inch Workshop" model, a type that dated back to the last months of 1933 and the Company's Model 5. It is suspected that, while Boxford fitted a different gearbox to the earlier VSL models with the L00 spindle nose, this practice was discontinued and later editions of the manual not updated to reflect the change. Sonarr is a PVR for Usenet and BitTorrent users issue opened Sonarr/Sonarr Truncation of file names does not account for the file extension Describe the bug When dealing with very long file names, the Even though the South Bend headstock, together with its spindle and plain bearings, had proved to be reliable and rugged (a South Bend bed always wears out before the headstock) Boxford used a much more rigid, box-like casting open only at the rear (to accommodate the drive belt) and carrying a spindle running in easily-changed taper roller bearings. On early versions the large headstock gear was left "as cut" but later models (from an unknown date) had the leading edge of the teeth rounded to ease engagement. and Power limits. When moving these lathes, take care to support the rear of the countershaft otherwise the bars on which it sits may be bent. Join LiveJournal The top slide was provided with an extra 3/8" of movement (that usefully increased it to the same length as a No. It is sometimes not appreciated that lathes with power-feed aprons - the Models A, AUD, B, BUD and VSL and B - not only benefited from power cross feed but also a range of slower longitudinal feeds than the Models C and CUD, the reduction through the apron's worm-and-wheel gearings meaning that the feed rate was reduced by a factor of 0.3. In the case of the Model C, where the clasp nuts are in constant use (taking the place of the power-feed mechanism) it may be necessary to pick embedded material from the thread roots with a sharp-pointed tool. The writer's experience is that inverters by Mitsubishi and Jaguar are the most reliable.If you have the slightest doubt about wiring in a new motor or switch - or otherwise modifying the electrics on your lathe - pay a suitably qualified electrician to do the job for you. The country, exhausted from fighting and winning WW2, found itself short of almost every commodity and in urgent need of funds - the cry was: "Export or die". ACCUT L-3000CNC. However, it is known that an ME10A, serial number 43293, was purchased direct from the Company later that year - so obviously, although the official stock list had been closed, a number of machines were left over, or built up from parts. Work also involves using a variety of precision measuring instruments, making necessary adjustments during machining operation to achieve requisite dimensions to very close tolerances. 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