What is the best way to fixture small or intricate parts such as letters or logos?
This is always a difficult question without specifics, but there are some options to try. First decide whether to use universal (flow-through) or dedicated (discreet) vacuum. This will determine the best methods of fixturing. Universal vacuum systems can be set up so that their need for large surface areas to hold onto is accomplished through the intelligent use of scrap and appropriate tool diameters. Typically small diameter tools (those causing less lateral pressure on the part) in conjunction with skin cutting or tabbing have had the best success rates. Low vacuum loss is essential in this type of configuration and it is not uncommon to see problems with holddown as a large panel is gradually machined into smaller parts. Skin cutting to the masking can eliminate vacuum loss, as can the use of scrap pieces to gradually cover cutouts and reseal the cut paths as the program advances. It is also essential to seal the edges of the universal vacuum spoilboard and any unused areas on the
