In order to maintain their body temperatures, Chickadees must take in a large number of food calories which will be metabolized for body heat. Calder (1974) notes that Black-capped Chickadees ... must eat continuously during short daylight hours to stoke their metabolic fires.
Industrial sewing machines are the best option for sewing upholstery-grade fabrics such as vinyl and leather because these machines are designed to handle thicker fabrics. Industrial machines use heavier upholstery thread and often sturdier needles which penetrate the material cleanly.
Such a system is commonly fitted to machines in today's shops, especially for metal working â lathes, cylindrical grinders, milling machines, surface grinders, boring mills and other machine tools â to allow the operator to work faster and with greater accuracy. Use of DROs is not limited to manually operated machines.