Round Hole Punching
Stock sizes and Coding
Please refer to the round punches and dies page for ‘ex -stock’ sizes and the die size range available.
Non-stock sizes are available to customer specified sizes at no extra cost - with a few extra days delivery.
Punches are stamped around the head rim with the metric size in format xx,x - whilst the dies are stamped around the rim in the format xxx. For example: 10,3mm diameter punch - No 105 die (suits 0,8 to 1,2mm thick metals)
Above: A typical unit tool arrangement on a bed plate ready for fork lifting into a mechanical power press.
Complete Units - punches & dies.
The complete units referred to on this site are normally available 2-3 days ex-works subject to stocks remaining unsold. This applies to the popular size range punches and dies normally Model M10, M14, & M20 for diameter from 3,0mm up to 20,0mm.
The ‘Minni-Die’ system allows tool designers and product manufacturers to reduce tooling costs in comparison with ‘single purpose’ die sets. Modification of components with either more holes or different size holes can easily be accommodated. This minimises down time and tooling costs considerably.
This feature is particularly useful for example where a ‘family’ of components such as fluorescent light fittings or steel filing cabinets components might be considered.
Model type - Description
The ‘Minni-Die’ range of punching and notching units are either ‘punch head’ types or ‘stripper’ types. The popular and most used units in the range are models M10 to M41 which include punch sizes from 3,0mm to 41,0mm diameters.
All units are self contained in the shape of a C-Frame and have no attachment to the top beam or platten of the press. The punch and die are aligned automatically by a key to the punch and a dowel key to the die keyway.
Operation is by one cycle of the press. During the cycle, the sleeve or stripper grips the material to be punched as the disc springs are compressed and the punch is forced through the metal. On the return cycle of the press, the punch is automatically extracted from the metal and pulled off the punch by the stripper and spring forces.
The base of each unit in the range has a group of dowel holes which varies from model to model. The central dowel hole is concentric to the major axis of the tool body holder
above: An assortment of different types of ‘Minni-Die’ products including C-Frame units, 90 degree corner notchers and hydraulic ‘Uni-Cages’
The Punch size is stamped with the metric size around the flange rim of the head of the punch. E.g. 12,7mm (0.50”) - see chart for stock sizes
Select the die size from the chart for the material thickness to be punched. E.g. for 12,7 dia punch in 3mm MS or Alu use 0,6mm total clearance die size
The Die No is stamped around the rim and indicates the actual die size. E.g. for 12,7mm punch in 3mm MS use die No 133 - (which is 13,3mm diameter)
The saucer shaped washers are DIN 2093 disc springs - which are sometimes called ‘Belville Washers’ and these supply the stripping force to pull the punch out of the metal
above: is a diagram of how a set up on a power press could eject scraps through the bed for collection in slug trays.
Left: shows a diagram of units set up in a row to punch a simple strip component.
‘PARSELL’ & ‘MINNI-DIE’ : Manufacturers of ‘Minni-Die’ C-Frame unitised hole punching, notching & cropping tools
40 Trent South Industrial Park, Little Tennis Street, Nottingham.
Tel Int +44 (0)115 941 9009 Fax Int +44(0)115 950 3921 Mobile: +44(0)7860 351 648
Used in Press Brakes, Mechanical Presses, Hydraulic Presses & Custom built hole punching machines
please contact webmaster with any comments or problems with this site. Copyright 2007 Parsell Minni-Die & G M Parsell. All rights reserved
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for sheet metals, roll formed sections, aluminium extrusions, tubes & plastics
Nottinghamshire. ENGLAND. NG2 4EQ. U.K.
Registered Office: Roter Adler, Thoroton. Nottinghamshire. NG13 9DS.UK : Parsell Ltd : Company registered No: 0343 4947