Could you confirm my diagnosis. Regards Rick Rick, Sounds like a familiar story. Yes Capacitor is bad, one side open the other shorted to ground or motor case. You might try this, remove capacitor and wire as though it was never there. Green to case.

Author:Mikam Nale
Language:English (Spanish)
Published (Last):20 January 2007
PDF File Size:20.31 Mb
ePub File Size:20.90 Mb
Price:Free* [*Free Regsitration Required]

UK-market badge from the Elliott era American-market badge. Although tiny, it was perfectly capable of decent work, available with a wide range of accessories and was light enough to be lifted on and off the workbench with one strong hand. The original model stayed in production until , with a run of around , examples, at which point it was replaced by the Unimat 3, an entirely conventional-looking lathe and one not nearly as adaptable to so many different uses. Eventually to be distributed world-wide - with importers using a variety of badges on the headstock - the first known advertisement for what was to become known as the DB in the USA, and SL in Europe, has been traced to page 60 in the October, issue of Model Railroader Magazine and placed by the original American importer Plasticast of Chicago, Illinois and Palo Alto, California.

The crude pictures accompanying the text showed not the very first model, but the slightly modified Mk. The earliest discovered European mention of the lathe was in the February edition of the popular English magazine "Practical Mechanics" - an early German-language of the full catalogue is here.

In the UK the lathe was marketed first by J. Smith Ltd. Distribution then moved to an organisation called Emco-Lux, almost certainly a tie up between a long-established German-owned European tool distributor and Maier. Finally, with an expanding range of products, and a move into CNC machine tools, Maier grasped the nettle and brought the marketing and distribution in-house. However, as might be expected with such a popular little lathe, Sears Roebuck and Co.

Rather late in the day, on August 1, , a United States patent No. However, there are four known copies of the Unimat: the Rowic HM from Argentine, one of an unknown name manufactured in Russia and the other possibly in East Germany.

While the Rowic appears to have been so well made - and so similar to the original - that it may well have been manufactured using replicas of the proper factory dies, the other two, from countries under communist control at the time, were significantly different.

One especially interesting Unimat-based lathe has also been found, a home-made version - seen here. Continued below: Black crackle finished Emco Unimat Mk. To distinguish between the lighter and heaver ZAMAK versions unless you have both togther and can pick them up examine the area where the milling post comes through - on the lighter version there are six bracing ribs around the hole and on the heavier just one round boss in the middle of a rib towards the front; on a light base five of the six ribs have round bosses while the 6th, towards the tailstock, does not.

The heavier base, having a much higher zinc content hence the weight , meant that it could be subjected to "plastic cold flow" if left under constant stress. Owners have seen this phenomena exhibited in a Unimat left in the vertical mode for many years where the hole in the base was so deformed that the column was no longer truly vertical. Could the change to the lighter, higher-aluminium content base have been due to this or, much more likely, cost savings? A central leadscrew was used to drive the carriage up and down the bed rails.

Although at first the carriage had no form of lock, later models were given a clamp bolt at the rear that also acted as a form of adjustment to the sliding fit. The cross slide followed the same design and, just like the English Drummond Little Goliath of 25 years earlier, ran on two bars instead of conventional machined ways.

The headstock could be swivelled on its mounting and, fastened to its end face and so rotating with it , was an aluminium bracket that carried the motor and on most versions an additional speed-reduction pulley. By reversing the pulleys, and rearranging the belt runs, 11 speeds of approximately to r. With its unique headstock design, ingenious drive system and clever accessory mountings, everything points to the lathe being designed from the outset as a multi-purpose machine that could be gradually equipped with a range of profitable extras.

The aim had been to allow its use as a metal or wood lathe, miller, drill press, polisher, grinder, jig saw, saw bench, wood planer or jointer, sander or even - with the headstock detached from the bed and fitted with a grip - as a hand drill. The conversion process from one mode to another was generally well thought out - and simple to execute: for example, to complete the important alteration from turning to milling and drilling, the headstock, complete with its motor-drive system, was removed from the bed and remounted on an aluminium bracket carried on a As a note of interest there were at least two designs of vertical column and methods of locking them in place: the later type had a groove machined around the shaft with a blind hole, bevelled at its entrance, against which the locking bolt pushed.

On earlier examples the hole was drilled though the shaft and a different type of locking bolt used. In order to provide a vertical feed, the 12 mm threaded headstock spindle and its bearings were mounted within a cylindrical "cartridge", with a rack, formed along its rear surface, engaged by a splined bar inserted into a hole bored through the top face of the headstock. The first kind splined drive-bar used to move the cartridge was fitted with a very short, plain handle but later a black knob was added and finally the handle retaining the ball , was lengthened.

To excite the anoraks amongst us, some six variations on the handle have so far come to light. Although the exterior dimensions of the cartridge were one of the few things to remain unchanged throughout production, its contents did not.

The first example used a crude system, similar to that employed in a bicycle hub, with crowded loose balls contained between cones with the single-groove drive pulley held in place overhung, at the left-hand end of the cartridge by an M nut, the adjustment of which was used to set the bearing pre-load.

The outside face of the front cone was ground to an abutment flange for items screwed onto the spindle nose - although this arrangement may have caused problems with the bearing adjustment, with heavier interrupted cuts tending to tighten the cone and reduce clearances. Later arrangements were more sensible and robust, with the use of two single-row, self-adjusting sealed-for-life ball races NSK Bearings part number E with wavy "Belville" washers providing the thrust.

As a point of interest, the spindle from this unit was also used in the Toolpost Grinder part number VS that Emco offered for their larger V7, V8 and V10 lathes.

In order to form a chronological sequence, and so help owners categorise their lathe, the various changes to the cast-iron models in so far as they have been discovered will be listed as "Mk. It must be emphasised that the manufacturer did not use these, nor were the alterations given any publicity at the time. It is also possible that the lathes inspected may have been upgraded or modified - and it is entirely possible that some of the following conclusions are incorrect.

Unimat Mk. Despite being intended as a mass-production unit evidence from these specimens shows that, at first no doubt because of the still-severe economic conditions at the time , the Emco factory would have had a limited number of automatic production machines and a good deal of hand-work went into each example. There is also an indication that little time or material was wasted with, for example, the castings having an indifferent cosmetic finish and wrongly spotted and partially-bored centres holes corrected - but with the initial damage to the component ignored.

As it would have provided the easiest and most reliable route into production the first version like nearly ever other amateur lathe of the time , had its base and other major castings in iron.

That section of the base on which the headstock fitted was rectangular in shape, with a flat front, and bored to accept a large "inverted-cone" that allowed the headstock to be rotated or quickly detached.

A pin, screwed in through the left-hand face of the casting, engaged against the cone, and drew the headstock down and locked it in place. Unfortunately there was no provision for aligning the headstock, other than fitting the tailstock ram with a centre and pushing it into the spindle hole - while simultaneously tightening the locking screw. The smaller turned-parts on were probably made on a "Swiss Auto" - and ideal machine for making quantities of precision miniature components - with the plain-steel, mm diameter handwheels having a pleasing diamond knurl around their outer edge, tiny micrometer dials engraved into the inner boss and straight pins for hand-grips.

It is likely that more than one kind of handwheel was fitted on the production line, with some being of a slightly different diameter to others. In comparison with later machines the drive pulleys exhibited several significant differences: they were thinner in section and of a much lighter, even delicate construction.

The original belts were in the form of coiled-steel wire "springs", not an ideal material to run against aluminium. The motor bracket, later a neat die-cast affair, was a rather rough aluminium casting with only the holes machined.

From the start of production the motor bracket came with an idler pulley - but machines have been found without this fitting possibly to ease the fitting of a particular accessory and hence only 6 instead of 11 speeds.

A later offering was a "slow-speed" bracket with two idler pulleys designed to allow much lower revolution and so make more effective use of the "chase-type" screwcutting attachment. Because of its construction, and the fact that the bed bars were socketed into the base casting, it was necessary to dismantle the entire lathe if the tailstock had to be removed.

An examination of the castings used on early lathes show them to have an inferior finish to later ones, though no doubt their material quality was entirely satisfactory.

The vertical pillar was The hand-grip used to convert the headstock into a drill was quite rounded, perhaps a little smaller than the latter cast-iron production version--but much more comfortable to use.

Made in Holland by Motoren Eindhoven the ball-bearing, 40 watts, r. In order no doubt to give the unit a "machine-tool" or "technical" appearance it was finished, apart from the black-varnished field-lamination area, in an attractive crackle-black paint to match the lathe. To check if a motor has plain bearings look for a small hole in the protruding bearing housing at each end.

The hole leads to a felt washer that wicks just oil, less any dirt, into the sintered-bronze bearings. American machines all appear to have been delivered in a rather splendid fitted wooden box - while European customers, apart from those sold during the mid to late s, had to be content with finest-quality cardboard.

Most of the first boxes had nicely bevelled vertical corners, until at some point during SL production , this was stopped, probably as an economy measure. Some examples of this version have also been found with saddle and cross-slide locking screws the latter with a small brass plug pushed against the right-hand cross-slide bar but such fittings appear not to have been standard until at least the Mk. It may well be that some owners, frustrated by the absence of a carriage lock on their early machines, could have fitted their own - so it is impossible to be categorical on this point.

The tiny instruction book issued with this model was marked as being the 2nd edition and was originally typed on an A4 sheet, reduced to A5 and bound in grey card. The tailstock cantilever was reduced and the casting became a two-piece affair with the upper and lower sections clamped to the bed rails by a single Allen bolt.

Although the 2 and 2A had a carriage lock at the back the cross slide generally did not - that improvement appearing as standard on the 2B. The feed-screws on these models were changed to a left-hand thread, so allowing a "normal" feel - where turning the screw to the right resulted in a deeper cut; a far better arrangement than the "cack-handed" originals that did the opposite.

Again, with over-lapping production, it possible that these handwheels may have been seen first on the last examples of the previous type. Arranged by the simple and effective means of splitting the right-hand half of the casting from front to back, the cross-slide clamp used an M6 socket -headed screw set positioned at the front between feed screw and the right-hand 8 mm-diameter cross slide bar to squeeze the parts together.

However, this was not the first type of lock and some earlier versions have been found with a cruder system where, on the right-hand side front of the casting, an mm wide tapped boss was incorporated that took an M6 x 8 mm grub screw bearing directly onto the way bar.

So as not to mark the bar, a small brass button was used on the end of the screw. Although the system worked well enough, it did not have the clamping power of the later type and would probably not have stood up well to the demands of heavier milling cuts.

As a further confusion, some early machines of the Mk 2 and 2A type have been found with two locking screws on the cross slide, one at the front and another other at the back. Improvements were also made to the headstock, with the spindle being given a register flange and the 2-step pulley made reversible on its mounting - so providing an increase in the number of speeds.

The 3-jaw chuck and the drill chuck delivered with this lathe were identical to the ones supplied earlier, with the ring-scroll portion of the 3-jaw the part gripped to turn the scroll being diamond knurled and drilled with 6 Tommy-bar holes.

The entire body of the drill chuck was also given a distinctive and effective diamond-knurl finish. It is likely that the Mk. For the American market the 2A Instruction book was published by "American Edelstaal" in New York and was a considerable improvement over the original.

Continued below: A Mk. This example also has a locking screw on the cross slide. Continued: Unimat Mk. Upon first assembly the base casting and headstock were jigged and a small vertical slot cut across the junction of their front faces. When the faces were correctly aligned by using the tailstock method previously outlined it was possible to insert into the slot a small "setting piece" - a disc washer given by the handbook as being 0.

However, one measured has been discovered to have an OD 0. Whilst the OD and ID are plain machined the flats were ground. A photographic essay for the Mk. The handbook instructions differed from edition to edition, but the following is probably the clearest given: " If, with the tension screw No. The setting piece may be removed again after the headstock has been clamped in position.

The motor was the now-familiar larger plain-bearing Dutch unit, with the centre portion painted ether black or in a colour to match the rest of the machine. Several styles of handwheel were used, all turned from steel and plated silver or black.

Towards the end of the Mk. Some versions of this lathe have been found with two locking screws on the cross slide, one in the normal position nearer the front and the other in line with it further back. Realising that one 6 mm screw clamping the casting to the slide bar was entirely adequate, Emco did not persist with this modification.

Unimats of this age were also given a more robust carriage assembly with the whole of the casting, including the front and back walls through which the way-bars passed, noticeably thickened.


Emco Unimat SL and DB Manual (English)

These wonderful little machines are now orphans since Emco discontinued support of accessories, parts and manuals. The uses of these machines are as unlimited as the skill and imagination of the operator given the wealth of accessories available. In the final years of production the green steel cased motor returned and the hand wheels were now made of plastic. From what I have read, I believe over , units were produced. The fellow I bought it from assured me they were easy to find, maybe forty years ago this was true.



This page was last updated on: Shipping cost cannot be calculated. The entire body of the drill chuck was also given a distinctive and effective diamond-knurl finish. An examination of the castings used on early lathes show them to have an inferior wl to later ones, though no doubt their material quality was entirely satisfactory. A new, unused item with absolutely no signs mannual wear.


EMCO-UNIMAT Model SL Operating Manual

Unless specified, all shipments originate from In April the writer met a model engineer who had been given one as a present for his 21 st birthday some 40 years previously. Vintage Flyers, Price uinmat, Acessory catalogs, Paper material. However, by the mid s the technical literature with USA-market machines was showing two motors: Visit my eBay store. Maple Lake, Minnesota, United States.




Related Articles