High Precision & Complex Parts
Pin Insert
The design criteria for the pin insert was to use plastic with:
1. Low linear thermal expansion
2. Excellent chemical resistance
3. Excellent electrical insulation
4. High temperature resistance
Peek was chosen for the application. The application also deemed that the true position of each of the 128 pin holes had to be within +/- 0.04 of the mounting holes. Stug was able to machine the pin holes within a band of 0.015mm of the mounting holes. This was achieved by modifying the program to reduce incremental positional creep. All dimensions were verified by a CMM report. Pin positions were plotted to view any trends in true position. This component was machined on a CNC Mill.
Forming Die
The design criteria for the forming die was to use plastic:
1. Suitable for food contact
2. Operable at up to 70°C
3. Provides a smooth surface to prevent extrusion drag
4. Create new cross sectional shapes to provide the same cross sectional areas
Acetal was chosen for the application. The application deemed that the cross sectional area of the four shapes needed to be the same so that all extruded shapes of the same length maintained the same weight. With a known cross sectional area as a reference, each new shape was determined by accommodating a minimum cutter radius using modelling software. The accuracy of each cross section designed was +/- 1mm2 per 1000mm2. For smooth flow through the extrusion die, lead-in surfaces were designed and machined as per the model. This component was machined on a CNC Mill.
Adjusting Nut
The design criteria for the pin insert was to use plastic with:
1. Low moisture absorbsion
2. Good dimensional stability
3. Natural lubricity
4. Accurate rapid adjustment
Acetal was chosen for the application. The application deemed that the adjusting nut be able to move rapidly in both directions along a shaft to an accurate position. A nine-start multi-start thread met the criteria. For more accurate positioning a 36-start multi-start thread was used. The component was manufactured on a CNC Lathe.
Feed Scrolls
The criteria for feed scroll design is:
1. The type of container travelling through the feed scroll. (empty or full)
2. The shape of the container travelling through the feed scroll
3. The material of the container travelling through the feed scroll
4. The speed of the conveyor travelling into the feed scroll.
5. The use of single or twin scrolls.
Feed scrolls are manufactured from plastics such as Acetal, Nylon and UHMWPE. Feed scrolls can also be manufactured from Aluminium and Hard Anodised. The in feed and exit feed pitches are critical for smooth operation as are blends between the in feed and exit feed pitches. Pocket shapes can be determined by measuring a container on the CMM or from a supplied model of the container. Feed scrolls are modelled and machined using custom software on a CNC Mill.
For expertise, precision, quality and service we extend an invitation to you to contact Stug Australia for the solutions you require.
Call 03 9543 5044 or fill in the form below for more information.
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