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12 December, 2010

Improving performance of an old vibratory feeder – Tightening of Screws

A vibratory bowl feeder is constantly vibrating. Due to continous vibrations, there is a tendency for all the screws of the vibratory bowl feeder to get loose. This extends even to the screws by which the bowl is fixed to the vibratory drive unit. Hence, a preventive maintenance for any vibratory bowl feeder is to tighten the screws on a regular basis. There are four by of screws which need to be tightened are –

  1. The screws whereby the bowl is fixed to the vibratory drive unit.
  2. The screws by which the springs are fixed to the drive unit.
  3. The screws which fix the magnet.
  4. The screws which fix the coils

Tightening of all these screws on a regular basis will improve the performance of the vibratory parts feeder tremendously. The frequency of tightening of these screws should be around 1 to 8 weeks depending upon the usage, type and make of vibratory bowl feeder.

How to decide on the tightening frequency –

  1. A half wave vibratory bowl feeder vis a vis a full wave one requires frequent tightening – 2 weeks for a half wave vibratory feeder and 6 to 8 weeks for a full wave vibratory feeders – the reason being that the vibrations are smooth in case of a full wave vibratory feeder.
  2. A fabricated vibrator base vis a vis cast iron base – 2 to 3 weeks for a fabricated base and 6 to 8 weeks for a cast iron one – the reason being that the fabricated base would have a lot of welding stresses which will result in the screws loosening out more frequently.
  3. Fabricated Stainless steel bowl vis a vis cast aluminium bowl – 2 to 3 weeks for a fabricated bowl and 6 to 8 weeks for a cast aluminium one – the reason being that cast aluminium bowls work more smoothly and are perfectly balance while fabricated bowls tend to be unbalanced and are more heavy.

Thus the best results are for a well made full wave vibratory bowl feeder having a cast iron base with a cast aluminium bowl. Such bowl feeders require very less frequent tightening of bolts / screws.

Monish Shet

Monish Shete is CEO of Elscint Automation, a 30 year old firm manufacturing vibratory bowl feeders and similar small part handing products. He personally has more than 25 years experience with last 15 years being with Elscint. This blog will help customers and laymen understand the intricacies of vibratory bowl feeders. One can find information about the finer aspects of vibratory bowl feeders which cannot be found anywhere else. Case studies and information about various innovative ways of feeding and orienting of different parts are given in this blog.


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