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Abssac delivers reliable miniature lead screw for medical device

26 August 2010

Miniature lead screw designs have often been challenging with regards to application performance versus reliability and cost. A recent medical application supplied by Abssac posed some significant technical obstacles, which were successfully overcome. Using a 3mm diameter stainless steel trapezoidal thread form with a 1mm lead formed the basis of the design within an automated micro syringe device. The driven nut was used to provide the linear motion that would accurately dispense the drug.

The nut was manufactured from Turcite and incorporated an attachment tang to provide the connection to the syringe plunger. Turcite was suggested as the nut material as it is self lubricating. However, in an effort to reduce operational drag further and improve efficiency, the lead screw was coated with Teflon to make a very low friction linear assembly.
The final part measured 30mm in length and is supplied complete with a machined journal for motor connection. Abssac was able to supply the parts on budget and the component has exceeded reliability and performance demands set by the customer.

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