Mini lathe t slot cross slide.
The pages were typed, reproduced on a Gestetner, and contained just one photograph showing the lathe mounted on its special "octagonal-form" braced sheet-steel cabinet stand.
The robust backgear assembly clustered at the front, beneath the spindle line meant that speeds down to around 25 rpm could be achieved with greatly increased torque - and no risk of belt slippage - ideal for both screwcutting and turning large blocks of metal held in a four jaw chuck, or on a faceplate.
They are best run near their rated capacity all the time i. Headstock Bearings and Backgear In place of the ML7's plain white-metal bearings the Super 7 spindle ran in a tapered bronze bush at the chuck end and a pair of angular-contact ball bearings at the rear.
By the early s, with just the ML7 in production though a popular cylindrical grinder, the first of many, had also been introducedit was decided that the market could stand the addition of a significantly altered and more highly developed lathe. The toolpost clamp post was surrounded by three tapped holes, these being intended to accept the mounting screws for the indexing plate used on the 4-way toolpost; as supplied from the factory each hole was sealed with a small grub screw to prevent swarf working its way through to the feed screw and wearing it out.
On both lathes the tailstock can be improved immeasurably by the use of the optional lever-operated attachment; the increased sensitivity when drilling, especially on very small diameters, is well worth the expense. By this means the saddle to bed contact was arranged against the rear shear, yet the gib strip adjustment kept at the front. As an aside, although the cross slide on the long-bed ML7 or at least some of them appears to have been a standard Super 7 unit, its end bracket and the method of assembling the cross-feed screw to it were different specification sheets for both ML7 and Super 7 are at the bottom of the page.
The spindle was offset from the bed centre line towards the rear - a feature the makers ingeniously claimed in their first publicity sheet: The first proper, fully illustrated catalogue was issued in October and contained not only a complete technical specification but also cut-away diagrams and a list of the many and varied accessories.
An ML7 is around 42" long and occupies a space about 22" front to back while a Super 7 is approximately 46" long and a little deeper than the ML7 at around 27". By this means an otherwise unused already-machined surface could be used and combined with an adjustable gib strip a much longer and more stable contact obtained.
Buying a Used 7-Series - and value for money: Drive System Powered by a 0. Of ribbed box-section, the bed was constructed with a flat top of typically English style, with narrow vertical shears, the nearer one in the gap between the front and back ways being shared by the saddle and tailstock. In mini lathe t slot cross slide USA, with 60 Hz motors running at rpm, the speed range was correspondingly faster.
As a way of instantly recognising the era of a Super 7, until the lathe had a distinctive drip-feed oiler built into the front of the headstock casting, the circular window of which was just to the left of the chuck. For quiet and smooth running the makers recommend a resilient-mounted motor with rubber rings isolating the main housing from the foot and, so equipped, an ML7 will turn almost silently.
This significant re-engineering of the drive which also involved new belt-guard covers made a huge difference to the running of the lathe making it both smoother and quieter. For details of the screwcutting gearbox fitted to the Series 7 Myford lathes, see the section below about the Super 7 Tailstock Able to be off-set on its sole plate for taper turning, the tailstock was fitted with a 1-inch diameter barrel, threaded 8 t.
The dimensions of the original spindle - 1.
The spindle was in tons high-tensile steel and ran in plain, parallel Glacier TI Alloy "half-step" bearings with laminated 0. Constructed using top-quality materials and assembled with care and finished to a high standard - even to the extensive use of fully-machined and chemically blackened nuts, bolts and other fasteners - they hold their value well. The design of the saddle was interesting: Many an enthusiast has found that buying a well-worn machine and restoring it to useable condition is a fascinating exercise that demands the application of numerous skills to produce a useful and valuable end product.
Even so, the standard slide had a generous 30 square inches of clamping surface and, with the top slide removed, was ready to be used as a miniature boring table or to mount a milling slide or rear toolpost. I have seen countless ML7 lathes that, despite having given more than sixty years of service, still had bearings that were "spot on".
However, in later years, replacements were always provided as bronze-bearings because the oil feed to the bearings is "constant loss", it is important to make sure that, every time the machine is run, both oilers are topped up and opened to give a generous rate of feed - one drop per 30 seconds as a minimum.
As supplied to the UK market with a 50 Hz r. With all the main surfaces at either the same level or at a right-angle to each other, one advantage of the bed design was the relative ease of regrinding with set-up times greatly reduced.
However, allowing for the fact that the two fastest backgear speeds in mini lathe t slot cross slide range were not recommend for use, this gave 14 speeds of: Tailstock With a longer travel than the ML7, the Super 7 tailstock was also fitted with a ball-bearing thrust race, a quick-feed, multi-start thread, self-eject for the centres and a longer barrel and housing.
Don't be tempted to make or modify parts yourself - use original components and preserve the authentic look and feel of the machine - this will not only enhance its value, but also make using it a much more secure and enjoyable activity.
In Junefrom lathe SKthe clutch was incorporated in the large 2-step countershaft mini lathe t slot cross slide and the countershaft bearings changed to mini lathe t slot cross slide Oilite bushes.
Even today any type of power-cross-feed Super 7 is relatively rare on the used market, especially one owner, carefully-used examples. Unfortunately, the assembly did contain a weak point: The clutch too was also prone to rattle unless correctly adjusted - reference to the maker's instructions on this point is vital.
Towards the end of ML7 production, a New Zealand engineer pointed out that it would be better if the tool thrust was to be taken along the full length of the saddle's inner rear face by using the bed's fourth vertical shear counted from the front.
However, despite their success, not even the most enthusiastic of owners could boast of them as state-of-the-art products and, by the close of the decade, the new-for American Atlas 6-inch with its all-V-belt drive countershaft, roller-bearing headstock, fully-guarded changewheels and a host of user-friendly details was setting the benchmark for hobby-lathe design.
Acme-form feed screws as the cross slide and both carried identical micrometer dials die-cast in ZAMAK; while a "character" part of the machine the early dials are not as easy to read as the properly-engraved units fitted to very late models. Hardened steel pins were employed, carrying bushes keyed into the gears and with neat, quick-release washers retained by slot-head screws allowing the gears to be changed quickly.
However, if it's not, do worry…