Trimloss last updated

17th January 2018

by Julie Moorcroft

Moorcroft Computer Services

Thinking clear       Thinking software

Thinking Trimloss


by Julie Moorcroft

Moorcroft Computer Services


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Complete Racking Instructions


In the early days of glass optimisation, Trimloss used “A” frame racking, because when most of the glass in a batch was of the one type, this allowed glass for each unit often to be paired up immediately.  When immediate pairing was not possible, the extra handling was minimal.  Our “A” frame racking models were the envy of our competitors.  We think we were so successful where our competitors were not, is because we understood how to handle glass safely, often trying glass break out ourselves, to see the difficulties which cutters experienced and the practical limits of safe glass racking.  





Because the two pieces of glass in each unit are now nearly always different however, the old “A” frame or “L” frame method of pairing no longer works.  The only method which does work is slot racking.  With every leaf broken out, whether from an optimised diagram, or from hand cutting details for the low volume glasses, there is a racking instruction to tell the cutter both the rack number and the slot number within the rack.  Glass going for toughening, also has the same numbers, but is racked initially by a single bed loading sequence number which matches up with the optimised bed loading diagrams.  


The bed optimisation attempts to increase the yield of the bed loading, thereby reducing the likelihood of hot or cool spots in the furnace which increases product quality and safety and reduces total energy consumption.  Furthermore, it also takes account of the orientation of the glass in the finished window, so that any roller wave is also in a consistent orientation.  


Racking instructions with a rack and slot number may be sequencing the glass for a unit assembly line, taking into account spacer type, colour, and thickness and whether units are Georgian, leaded, or artwork.  Alternatively, racking instructions with a rack and slot number may be sequencing single toughened glass ready for delivery, taking into account delivery date, delivery route or vehicle, customer and then a stackable descending size sequence which also takes account of the maximum racking height in the vehicle.  There are also corresponding spacer bar racking instructions so that glass and spacers match perfectly.  Some competitor’s software cannot do this, but they produce separate racking instructions for each optimised glass type which need much manual sorting to coordinate the whole batch and no output at all for non optimised glass types.  

At no point therefore with Trimloss, does a cutter, or any other shop floor operative have to work out where to put any piece of glass or spacer bar.  The entire route is worked out in advance in Trimloss for any and all types of production.  This system works without any manual sorting, for single, double, triple and quadruple glazing.  It does this without any of the compromises imposed by being forced to choose only one pairing method as with rival optimisers, whose pairing methods work only when both leaves of a unit are of the same glass type and do not work on triple or quadruple units at all.  




It is heartbreaking when we encounter a unit manufacturer not only still using “A” or “L” frames, but non portable ones fixed to the floor.  This means that maximum potential production output is at least halved, because these frames have to be emptied of glass before the next batch can be commenced.