Lenack Engineering has been machining parts on Citizen CNC sliding head lathes for lots of years.
Since the installation of its first Citizen A20-VII PL CNC sliding head automatic lathe, Lenack Engineering has cut cycle times by up to 20 per cent on certain components.
Managing director, Neil Bonafont, maintains that the installation of Citizen machines has rejuvenated his Haddenham company, which in recent years had seen profits slowly eroded in the supply of small turned parts to the automotive sector.
‘The opportunities in the automotive sector – which they began supplying 28 years ago – were beginning to decline very quickly, & if they had not moved into CNC sliding head technology with Citizen, they would not be in business today,’ he said.
Bonafont maintains that the heavier duty machine design of the A20 is immediately demonstrated by its ability to take larger cuts.
Since the installation of the Citizen A20-VII PL, the machine has provided an immediate capability to slash cycle times compared to those achieved on an older Citizen L25.
‘This overlap helps suppress any possibility of vibration, therefore improving tool life & surface finish.’ Lenack Engineering originally set up in north London as a traditional cam auto shop with four machines.
‘If you analyse where the faster cycles are being created, it’s the shorter strokes for tool movement at 18m/min hasty positioning speed with very high acceleration, & the improved Streamline Control application that enables the sequencing of axis feed to start without having to wait for the current motion of another axis to cease,’ he said.
The company slowly progressed into plugboard lathes &, at its height, six people were employed.
The company then moved to its 3,500ft2 facility in Haddenham in 2004 & installed a pre-owned Citizen L25 from NC Engineering of Watford – now Citizen Machinery UK – that led to a doubling of the customer base.
This machine also started the ability to take on new & different types of contracts in the medical, electrical & model making sectors, plus the creation of a wide general component machining service.
Following the installation of the Citizen L25, a pre-owned L25-VII was installed in 2005 that again made a massive impact on the business.
‘We ordered four on the spot as they recognised that it would generate a hasty return on the investment due to its ready-to-run package with no extras, except our choice to include the CNC Wizard programming aid.’ Both directors could also see the benefit from the faster setting for changeovers & the Citizen/Sandvik Coromant’s QS quick-change tool technique, which allows a tool to be changed at the machine within 40s.
‘We went to the Citizen curry evening at its Open House in the autumn of 2007 to see the first ever prototype of the new generation A20,’ said director Ben Khatri.
six of the first orders to be processed on the Citizen A20 was for a previous customer that had been let down by its Chinese supplier & wanted to bring its source of small turn-milled parts back to the UK.
While waiting for the production version of the A20 to be officially obtainable in mid-2008, the decision was also made earlier in the year to install a used Citizen L32-VII (from Citizen Machinery’s used showroom) to give the company a greater 32mm capacity & to attract new work in preparation for the A20.
‘By the time the customer added transport costs, the hidden costs of wrong parts, & aggravation, there was very little difference in the price they were able to quote using the A20 with its single operation cycles,’ said Bonafont.
‘We also eliminated his uncertainty of supply.’ Batch sizes at Lenack Engineering tend to range between 50 to 12,000 but orders of over 50,000 parts have been produced on a range of certain medical components involving rollers & pillars for an international medical group.
‘These machines have definitely increased our flexibility to respond to customers in a way they could never have foreseen, & with Citizen being half-hour down the road, support when they need help is always readily obtainable,’ added Bonafont.
The company has completed an order for the turn-milled parts in aluminium, brass & stainless steel for 250 remote controlled helicopters destined for the US.