Spring stops, also referred to as spring stop buttons, are used for light workholding applications to hold a work piece to a locating surface prior to clamping.
Types of Spring Stops
Spring stops can be classified based on the button type at the pressure point or by the material used to construct the spring. Button types include spherical, flat, and flat face.
- Spherical buttons have spherical shaped buttons with rounded edges.
- Flat buttons have a rounded edge and a flat face.
- Flat faced buttons have a rectangular shape and a flat face.
- Some button shapes also include a tang at the bottom.
Materials of Construction
Materials used to make spring stops include aluminum, steel, plastic, and stainless steel.
- Aluminum is a bluish, silver-white, malleable, ductile, light, trivalent, metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation.
- Steel is a commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. It is malleable when under suitable conditions, and is distinguished from cast iron by its malleability and lower carbon content.
- Plastics include any of numerous organic, synthetic, or processed materials that are mostly thermoplastic or thermosetting polymers of high molecular weight and that can be made into objects, films, or filaments.
- Stainless steel is chemical and corrosion resistant steel that can have relatively high pressure ratings.
When selecting spring stops, the most important considerations are its shape and load capacity. The spring must be able to provide adequate workholding for the application, and must fit the workpiece in such a way as to provide correct holding force without indenting or damaging it.