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CNC turning lathe, Swiss type lathe original manufacturer since 2007.

African Engineers: Solomon Adjololo

Kumasi, Ghana's second city, boasts what is claimed to be the largest market in West Africa at Kejetia. The most successful woman trader in each major commodity is designated the queen of that segment of the market. Thus one can find a 'shoe queen' or a 'soap queen.' If the many engineering entrepreneurs of Kumasi were to adopt the same practice, Solomon Adjorlolo would undoubtedly be elected king of that domain.

Solomon Adjorlolo was a technician engineer at the physics department of the Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, but his ambition was to start his own business. He began in 1971 by making basic physics instruments to sell to secondary schools. Helped by Dr Frank Lukey, an English physics lecturer, Solomon started his business in Dr Lukey's garage on the KNUST campus. As the business expanded and a few basic woodworking machines were acquired Solomon decided to find a workshop at Anloga, a suburb of Kumasi with a large community of carpenters and where he had family connections.

Wood was not the only material used in Solomon's early work but it featured in most of his products. He diversified into producing more wooden products like primary school teaching aids, drawing boards and tee squares. At first, the customers buying these products were private schools run by the churches which paid their bills promptly, but to further expand the business Solomon was forced to seek orders from state schools. Told to collect payment from the Ministry of Education, the money either came very late or not at all. He decided that the business couldn't go on like that and he must explore new markets.

It was then that Solomon contacted the Technology Consultancy Centre (TCC) of the university. The TCC was demonstrating metal machining and welded steel plant construction and offering training and access to machine tools, so Solomon decided to turn to metal manufacturing. Through this programme, in 1979, he was supplied with machine tools: lathes, a milling machine, welding and sawing machines. Solomon decided to formally register his enterprise and changed its name to SIS Engineering Ltd.

Surrounded by hundreds of carpentry workshops, the new company was sometimes requested to undertake repairs on imported bench saws, planers and woodturning lathes. Solomon noticed that only a few of the bigger workshops could afford these imported machines and there was a big market on his doorstep for locally produced machines sold at affordable prices. He began making bench saws and woodturning lathes and found that constructing machines was much more profitable than any of his previous ventures.

After a few years almost every workshop in Carpenters' Row, Anloga, had an SIS bench saw and several workshops were operating with four or more SIS woodturning lathes making thousands of furniture legs and the popular double-ended pestle called an 'ata' (twin). Not only in Kumasi but throughout the country, SIS machines were gaining a reputation for durability and efficient after-sales service. In addition to lower cost, being able to supply spare parts and repairs at short notice proved a major advantage in competition with imported equipment.

By the mid 1980s, SIS was producing much more than woodworking machines. The post-harvest and food processing industry was a large potential market for affordable locally-produced machines. SIS produced a range of machines for milling corn, processing cassava and extracting palm oil and shea butter. As the work progressed the machines grew larger to reach an industrial scale, with multi-tonne-a-day feed mills for large poultry farms, vegetable oil mills and steam distillation plants producing perfume from citronella and lemon grass.

Although Solomon was now producing plant for quite large enterprises he never lost his concern for helping the small-scale informal sector industries. Helping traditional women's groups producing basic foodstuffs was always one of his priorities. For example, the popular food product 'gari' was made from cassava by groups of women using simple hand tools and charcoal stoves. When he was asked to produce a mechanical plant for a male entrepreneur he was worried that the women might be driven out of business. He consulted the TCC, and working with the National Council on Women and Development (NCWD), aid agencies were alerted to the danger and many of the women's groups were supplied with the new technology.

By the late 1980s, many of the orders for food processing equipment came directly to SIS Engineering from development agencies promoting rural and women's industries. No longer needing the TCC as a go-between Solomon was helping the TCC more than the TCC was helping SIS. He was involved in the development of new machines, training apprentices and contributing to teaching workshops, seminars and short courses held at the university. However, remaining a leading member of the TCC Clients Association, Solomon Adjorlolo always maintained that without the advice of the TCC to change to metal manufacturing, and the supply of machine tools on easy-payment terms, none of his success would have been possible.

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Maintaining Swiss-Type Lathe Fixtures – Locking Accuracy at the Micron Level

Daily “Clean + Lubricate” as the Baseline
After each shift, remove chips and coolant residue from the fixture surface and collet jaws with a soft cloth or air gun to prevent corrosion and re-clamping errors. Every eight hours, apply a trace of rust preventive oil to spring collets, guide bushings and other moving parts; once a week, add a thin coat of grease to ball-screw nuts and hydraulic cylinder rods to reduce wear. Before any prolonged shutdown, spray anti-rust oil on internal bores and locating faces and wrap them in wax paper or plastic film.
Precision Calibration & Data Closure
Use ring gauges or master bars every month to verify repeatability of the fixture; log results in the MES. If deviation exceeds 0.005 mm, trigger compensation or repair. For quick-change systems (HSK/Capto), check taper contact percentage every six months—target ≥ 80 %. If lower, re-grind or replace.
Spare Parts & Training
Keep minimum stock of jaws, seals and springs to enable replacement within two hours. Hold quarterly on-machine training sessions for operators on correct clamping practices and anomaly recognition to eliminate abusive clamping.
In short, embedding “clean–lubricate–inspect–calibrate” into daily SOP keeps the fixture delivering micron-level accuracy, reduces downtime, and extends overall machine life.
How To Preventing The Hidden Damage in Swiss-Type Lathes


Six preventive measures


Environment control: keep the workshop at a stable temperature and low humidity; exclude dust and corrosive gases to reduce chemical wear on guideways and screws.


Daily checks: remove chips every shift and inspect the lubrication of the spindle, bearings, ball screws and guideways; act on any abnormality immediately.


Preventive lubrication: replace lubricants on schedule and keep the lubrication system unobstructed to minimize fatigue wear.


Accuracy monitoring: use laser interferometers or ball-bar systems monthly to measure geometric errors and compensate for ball-screw backlash or guideway straightness in time.


Electrical health checks: periodically examine cables, relays and cooling fans to prevent hidden aging caused by overheating.


Data monitoring: onboard sensors record spindle current, vibration and temperature; cloud-based analytics predict early bearing or tool failures.


Why prevention matters
• Ensures machining consistency: eliminating micron-level error sources keeps batch dimensions stable and reduces scrap.
• Extends machine life: preventing micro-cracks from growing can prolong overall life by more than 20 %.
• Reduces unplanned downtime: planned maintenance replaces emergency repairs, increasing overall equipment effectiveness (OEE) by 10 % or more.
• Cuts total cost: lower spare-parts inventory, labor and lost-production costs can save tens of thousands of dollars per machine annually.
• Enhances brand reputation: consistent on-time, defect-free deliveries strengthen customer trust and secure future orders.
Cycle Time Optimization Strategies for Turn-Mill Machining





Optimizing cycle time on turn-mill machining centers is crucial for boosting productivity and reducing costs. It requires a systematic approach addressing machine tools, cutting tools, processes, programming, fixtures, and material flow.
Level Re-verification — The Gatekeeper of Swiss Lathe Accuracy



Ensure Geometric Accuracy
Swiss-type lathes process long, slender workpieces with multi-axis synchronization. A bed inclination of only 0.02 mm/m creates a “slope error” along the Z-axis, tilting the tool relative to the part centerline. This results in taper on outer diameters and asymmetric thread profiles. Periodic re-verification and re-leveling restore overall geometric accuracy to factory standards, guaranteeing consistent dimensions during extended production runs.


Extend Guideway and Ball-Screw Life
When the machine is not level, guideways carry uneven loads and lubricant films become discontinuous, accelerating localized wear and causing stick-slip or vibration. After re-leveling with shims or wedges, load distribution evens out, reducing guideway scoring and ball-screw side-loading. Service life typically improves by more than 20 %.


Suppress Thermal Growth and Vibration
A tilted bed leads to asymmetric coolant and lubricant flow, generating thermal gradients. Subsequent expansion further amplifies geometric errors. Re-verifying level, combined with thermal compensation, produces a more uniform temperature rise and reduces scrap caused by thermal drift. Additionally, a level bed raises natural frequencies, cutting chatter amplitude and improving surface finish by half to one full grade.
 From Low-Cost Alternative to Global Value Leader – China’s Swiss-Type Lathes


Chinese-built Swiss-type lathes have moved beyond the “low-cost substitute” label to become the “value leader” for overseas users. On the cost side, machines of comparable specification are priced well below those of traditional leading brands, and ongoing maintenance costs amount to only a fraction, dramatically lowering the entry barrier for small-to-medium job shops in Europe and North America. Lead time is equally compelling: major domestic OEMs can ship standard models within weeks, and special configurations follow shortly thereafter. When urgent orders arise from the electric-vehicle or medical-device sectors, Chinese production lines consistently deliver rapid responses.

Intelligence is on par with top-tier global standards. Machines routinely feature thermal compensation, AI-based tool-life prediction, and cloud-enabled remote diagnostics. Mean time between failures is long, and fully open data interfaces simplify secondary development for end users. Complementing this is a worldwide service network: Chinese manufacturers maintain parts depots and resident field engineers across the Americas, Europe, and Southeast Asia, enabling on-site support often within a single day, whereas legacy brands usually require factory returns measured in weeks.
Solutions for Bar Feed Jamming in Swiss-Type Lathes



1. Quick Troubleshooting Steps


Check the clamping pressure: Ensure the pressure plate or collet applies even force; too much or too little pressure will jam the bar. Adjust the pneumatic or hydraulic release mechanism accordingly.


Align the material path: Verify that the bar feeder, guide bushing, and spindle centers are collinear; any offset will cause the bar to twist or wedge.


Inspect belts and rollers: Belts must be tensioned correctly—loose belts slip, over-tight belts bind. Replace worn rollers immediately.


Lubricate moving parts: Clean and grease the eccentric shaft, release cam, and pusher fingers; lack of lubrication is a common cause of seizure.
Installation and Maintenance Guide for Swiss-Type Lathe Bed



I. Installation Guidelines for Swiss-Type Lathe Bed
1. Foundation Preparation


Floor Requirements: The Swiss lathe bed must be installed on a solid, level concrete foundation to prevent machining inaccuracies caused by ground settlement or vibration.



Load Capacity: The foundation must support the machine’s weight and dynamic cutting forces to avoid deformation affecting spindle and guide bushing alignment.



Vibration Isolation: If the workshop has vibration sources (e.g., punch presses, forging machines), anti-vibration pads or isolation trenches are recommended to enhance CNC machine stability.
Key Functions of Ball Screws in Swiss-Type Lathes




Summary
Ball screws are the physical enablers of Swiss-type lathes across five critical dimensions:



Micron-level positioning for complex micro-structures;



High-speed rigidity supporting synchronized multi-axis cutting;



Active thermal control ensuring batch consistency;



Ultra-wear-resistant design enabling maintenance-free operation for 10+ years.
Their performance defines the precision ceiling of Swiss-type machining – truly "invisible champions" in precision transmission.
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