PSDNN 2020K12 EXTERNAL TOOLHOLDER

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  M4x0.70mm CHASER DIE 6mmD/HD TYPE S20

  Coventry Type Chaser Dies – ISO Metric: Throat Angle S20

  Cutting takes place only on the throat and the first full tooth; the remaining threads are above centre height and act as a nut, ensuring accurate pitch. Ideal for batch work or continuous production of threaded steel bar. Coventry dies are not interchangeable. An original set of new dies must always be used together. When taken from the diehead the set of dies should be retained in its box until required again.

  Throat Angles
  20° for general work and soft steels – supplied as standard.
  33° ‘B’ type for cutting brass, available on request.

  Grinding Dies
  Only two angles are ground on Coventry dies, the throat angle and the rake angle and in the particular case of Holozone dies only the throat angle is ground. All dies in a set must be ground on the throat at the same time and since they cannot be accurately ground by hand, a die grinding fixture must be used.

  Marking & Materials
  Each die is marked with: diameter, pitch, type of die and gauge number. Non-standard or special dies are marked with an SD number which should be quoted when re-ordering. When a set of dies has been re-ground several times by grinding the throat angle, the height of the cutting edge rises above centre. This condition must be rectified by grinding the rake angle until the die height is correct according to the number shown on the die.

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• 

  1/2″ (12mm) CHS COVENTRYDIE HEAD

  WS Style Coventry Dies Head

  Robust and reliable. Can be used on a variety of manual or automatic* machines. Can be supplied with any other straight or tapered shank. Takes standard Coventry type chasers. Repair parts readily available.
  *Supplied with spring band closer. Set for single cut only.

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• 

  1/4″ (6mm) CHS COVENTRY DIE HEAD

  WS Style Coventry Dies Head

  Robust and reliable. Can be used on a variety of manual or automatic* machines. Can be supplied with any other straight or tapered shank. Takes standard Coventry type chasers. Repair parts readily available.
  *Supplied with spring band closer. Set for single cut only.

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• 

  THE REF FLIPCHARTS 4TH EDITION WIRO

  Engineers Reference Data Charts

  Now with 38 pages of engineering data. Each page coated with an gloss lamination to protect against the dirt and grease encountered in workshop conditions.

  Contents:
  • Basic forms of heat treatment
  Colour charts for tempering and for hardening & forging.
  • Material groups
  Colour coded machineability chart and hardness listing.
  • Tensile strength and hardness
  Shore hardness and equivalent tensile strengths and conversions included.
  • Lubricant selection
  Colour coded materials chart and dilution guidelines.
  • Hole and shaft tolerances
  H7-e8 tolerances for counterbores included.
  • Metric screw and hole sizes
  • Thread notation
  Explains terminology used to define thread characteristics.
  • Standard thread forms;
  Sequenced logically, tapping and clearance sizes integrated into single chart and colour highlighted for quick reference. Includes special metric pitches & NPT, distinctions made between ‘Rp’ and ‘G’ series BSP. ISO 529 pitch form diagrams shown. Now also lists tapping and clearance drill sizes for fluteless tap.
  • Dimensions of common shank types
  Now includes screwed shank, Weldon, DIN Taper, BT Taper, ISO Taper in addition to Morse taper shank details.
  • Standards for engineering drawings
  Comprehensive listing including contemporary listings and illustrations.
  • Abbreviations used in engineering drawings
  • Common CNC codes
  Comprehensive listing including contemporary listings.
  • Axis nomenclature for machine tools
  Newly added page explaining the use of letter addresses to define directional motion.
  • Trigonometry formulae
  Colour coded CAD produced illustrations for quick reference.
  • Sines and Cosines
  Calculated to six decimal places with colour coded axes for quick reference.
  • Tangents and Cotangents
  Calculated to six decimal places with colour coded axes for quick reference.
  • Co-ordinates for equally pitched holes
  Clear and easy to read CAD produced diagrams.
  • Bending allowances for malleable materials
  Listed as metric radius and thickness with nearest equivalent SWG given for guidance. Clear and easy to read CAD produced diagrams.
  • Cutting speed calculator
  Gives required RPM for known cutter diameters and cutting speeds.
  • Standard drill size conversions;
  No & letter sizes integrated into a single chart, standard sizes are highlighted in bold text, size range extended from 25.25mm up to 32.50mm. All inch-fractional sizes converted to mm equivalent as well as inch-decimal and Morse Taper shank sizes are indicated against drill diameter ranges.
  • Abbreviations and formulaes
  Definitions of standard meanings with specific attention given to turning, milling and drilling.
  Comprehensive list of commonly used abbreviations.
  • Weight and measure systems, useful conversions and constants
  A comprehensive listing of contemporary and old systems, along with the necessary conversion formulae.

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