email: tony@lathes.co.uk
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LORCH BVIPK Sliding Headstock Screwcutting Lathe

More information about Lorch Lathes is contained in various Manuals, Parts Lists
and well-illustrated Sales & Technical Specification
Brochures and can be purchased on-line here

Lorch Home Page  Lorch Schmidt
LAS Precision Screwcutting and LAS, AV1-K, AV11-K, LLRGN,  AVRG, BVIRG, LLRN, AVR  &  BVIR Lathes
Precision Plain Lathes: LLS, LLV,LLK
Precision 50 mm Lorch KD50
Toolmakers' Screwcutting Lathe AVI-L   Sliding Headstock Screwcutting BVIPK
Screwcutting Type AB
Precision Screwcutting Lathe BL27LZ
Toolmakers' Miniature Lathes: LA, LAN, LLN & LLPN Plain and Screwcutting with Leadscrew
Lorch lathes--Newer Accessories
Lorch lathes--Older Accessories
Larger Screwcutting Lathes D27 & BIIZ
Lorch Dividing Apparatus for Watchmakers' Lathes
Lorch COLLETS
Lorch Watchmakers' Lathes
Lorch "Triumph" Watchmakers' Lathe
Lorch Junior Watchmaker's Lathe
Lorch Lathe Restoration

Early Lorch Model A Lathes
Lorch Milling Machines


An uncommon model, the late-model Lorch BVIPK was a screwcutting lathe that used, in place of changewheels, a sliding headstock system in conjunction with a set of star-shaped "master threads". The threading system was carried on a thick plate, dovetailed to the outside face of the headstock casting with engagement and disengagement by a lever that lifted it up and down. Each master thread carried six different pitches with a set of twenty or so covering all likely requirements. As the master thread was lifted, it meshed with a matching thread carried on the outer end of the headstock spindle and, as the spindle rotated, it was driven forwards through its bearings. A stationary cutting tool, held in a normal toolpost, then generated required thread on the workpiece as it emerged from the chuck or collet. Widely employed on ornamental turning lathes in the 1800s, by the early 1900s it was in widespread use by such Swiss companies as Schaublin and Mikron and by German makers including Boley, Lorch ,Wolf Jahn, Karger and Auerbach (the smallest model to incorporate it being the Wolf Jahn Model AA with a centre height of just 50 mm). The arrangement was also a feature of most "Swiss-Auto" mass-production lathes used for the manufacture of tiny parts - and is still in widespread use today on such machines - though these are now, of course, fitted with CNC control. The last conventional lathe on which  sliding-spindle screwcutting appears to have been available was a version of the Schaublin 102 marketed in in the early years of the 21st century. Usually included in the set of threads (to allow the manufacture chuck backplates and other work-holding units) would have been a coarse-pitch pair with the thread as used on the lathe's spindle nose.
The BVIP shown below is fitted with a very seldom-found - and originally very expensive - T-slotted Lorch milling slide with a self-contained, power-driven spindle to hold milling cutters and grinding wheels..
The BVIPK is believed to have been built from 1966 onwards. If you have an example with a date stamp earlier than this, the writer would be most interested to know..



email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
Machine Tool Manuals   Catalogues   Belts   Books  Accessories

LORCH BVIP Sliding Headstock Screwcutting Lathe

More information about Lorch Lathes is contained in various Manuals, Parts Lists
and well-illustrated Sales & Technical Specification
Brochures and can be purchased on-line here

Lorch Home Page  Lorch Schmidt
LAS Precision Screwcutting and LAS, AV1-K, AV11-K, LLRGN,  AVRG, BVIRG, LLRN, AVR  &  BVIR Lathes
Precision Plain Lathes: LLS, LLV,LLK
Precision 50 mm Lorch KD50
Toolmakers' Screwcutting Lathe AVI-L   Sliding Headstock Screwcutting BVIP
Screwcutting Type AB
Precision Screwcutting Lathe BL27LZ
Toolmakers' Miniature Lathes: LA, LAN, LLN & LLPN Plain and Screwcutting with Leadscrew
Lorch lathes--Newer Accessories
Lorch lathes--Older Accessories
Larger Screwcutting Lathes D27 & BIIZ
Lorch Dividing Apparatus for Watchmakers' Lathes
Lorch COLLETS
Lorch Watchmakers' Lathes
Lorch "Triumph" Watchmakers' Lathe
Lorch Junior Watchmaker's Lathe
Lorch Lathe Restoration

Early Lorch Model A Lathes
Lorch Milling Machines