email: tony@lathes.co.uk
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Box-Ford Precision Tools by Denford
Denford Comparators, Stands, Sine Tables & Sine Centres
Boxford Home Page   Boxford Models A, B, C, AUD, BUD & CUD 
Model ME10   Boxford VSL & 500 Vari-Speed   Model T & TUD Training Lathes   
Miniature Precision Boxfords  Larger Precision Boxford   Model CSB   
AUD Photo Essay  Serial Numbers   Screwcutting Gearbox  Boxford Accessories 
       Drive Systems  Precision Tools  South Bend Clones  Late Model Boxfords
Spare Parts For Sale   Catalogue Covers   
Gap-bed Boxford
A detailed Manual & Parts List  is available for all Boxford lathes.
We also manufacture changewheels and many other spares



The Box-Ford 1/10,000 comparator is probably the most commonly-found Denford precision accessory, and must have been made in considerable numbers. A full-scale deflection took just 100g grams of pressure and the unit was built to repeat with consistent accuracy over many years of use.  Various scales were available to cover a range of typical inspection tasks and two adjustable indicator points were provided to allow the operator to see the extent of any errors in a workpiece. A "fiducial" version was also available (of the fixed-reference-point type) for use on lathes or with length bars--and differences as small as 0.0001" could be accurately read to within an accuracy of plus or minus 0.00002".
Although claimed to be very reliable Denford offered an "Export Repair Kit" to enable servicing to be carried out in the field.

Universal mounting clamp

The Box-Ford "Dumpy" stand was intended for use as a quality-control fixture for checking small components quickly and accurately. The base was in meehanite iron topped by a 5.5-inch diameter hardened steel plate. The comparator was clamped to a 1.125-inch diameter column in ground steel  and, to allow workpieces to be slid in and out, the plunger could be quickly raised and lowered by levers, one set at each side of the unit. The maximum height capacity was 4.5 inches and the complete unit, including its fitted box (but less the comparator), weighed 21 lbs.



Box-Ford "Double Column" stand was intended for use on a surface plate when very fine comparative measurements were required. To set the unit prior to use a suitable length of arm was selected and connected by its dovetail to the main sliding housing and then three knobs turned to position the plunger: one at the side provided a coarse height setting, another at the top gave a finer control and the final sensitive setting made by a dial at the base where one-quarter turn corresponded to a movement of 0.0001" on the scale. The base unit was hardened and ground steel and the two columns chrome plated.

Box-Ford "Universal" stand was fastened to a hardened and precision ground base 2.75- inches wide and either 6 or 12 inches long or, optionally, a heavier unit 3.75 inches wide and 7 inches long. The vertical column was carried in a T-slot and locked by a though-bolt operated by a knurled nut at the top. Like the column the arm was chrome plated and carried in a swivelling clamp with a hinge unit at the end. A ribbed surface plate, locked by a cam-action T-bolt, could be fitted to the base making the unit a self-contained comparator unit.

Box-Ford Sine table, made in several sizes, was intended for use in either light machining or for checking tapered gauges and other components. To set the table the top plate was tilted by hand to approximately the angle required and locked by a lever. A recessed nut (seen at the end of the top plate) was used to control a micro-adjustment by which means the top roller could be lowered accurately on to the slip-gauge pile so the latter was just able to pass beneath the measuring roller.

The "Box-Ford 20-inch Sine centres" consisted of a base plate machined as a surface plate, an inclinable bed and a pair of adjustable centres. located by a single inverted V and a flat. The inclined element was raised and lowered by a handle working a screw and, with suitable use of gauge blocks, a comparator stand and a gauge, the instrument could be set to within 0.2 minute of arc for angles of tilt up to 35 degrees.



E-MAIL   Tony@lathes.co.uk
Home     Machine Tool Archive    Machine Tools For Sale & Wanted
Machine Tool Manuals   Machine Tool Catalogues   Belts

Box-Ford Precision Tools by Denford
Denford Comparators, Stands, Sine Tables & Sine Centres
Boxford Home Page   Boxford Models A, B, C, AUD, BUD & CUD 
Model ME10   Boxford VSL & 500 Vari-Speed   Model T & TUD Training Lathes   
Miniature Precision Boxfords   Larger Precision Boxford   Model CSB   
AUD Photo Essay  Serial Numbers   Screwcutting Gearbox  Boxford Accessories 
       Drive Systems  Precision Tools  South Bend Clones  Late Model Boxfords
Spare Parts For Sale 
A detailed Manual & Parts List  is available for all Boxford lathes. We also manufacture changewheels and many other spares.