Your tool is stalling or not performing as expected and you're asking yourself "why is my angle grinder turning so slowly?" or “why did my pneumatic grinder motor stop working?” If you're wondering, read on.

In this scenario, blaming the device itself would be an easy way out. However, there are two other key factors that can cause the tool to malfunction: Air line installation and maintenance routine. These are often overlooked.

If the abrasive rotation of your pneumatic angle grinder motor begins to slow down, or if the motor stalls when you apply force, this is an indication that the tool is not operating at full performance. It is very important to pay attention to these indicators, otherwise this will negatively affect productivity.

Applying less force to prevent the tool from stalling is a frequently used way, but it causes the job to take longer to complete, resulting in decreased productivity. If productivity is affected, this will bring serious financial consequences and lead to a decrease in global production.

Let's take a closer look at the two most common reasons that affect the performance of a pneumatic grinder

1. Air line installation and air line accessories

There are two things required for a pneumatic tool's motor to run smoothly and at maximum speed:

  • 6.3 bar dynamic air pressure at the tool inlet 
  • Recommended air flow
  • by the tool manufacturer

    Without the correct pressure and flow, the tool's motor will not have enough energy to drive the abrasive at full speed, resulting in lower efficiency than it should be (always check the abrasive manufacturer's recommended speed for rated speed).

    How to achieve correct dynamic air pressure and airflow?

    Selecting the right air line accessories (hose, couplings, Conditioner (FRL) etc. is critical to ensuring the performance of your tool.

    We prepared the CP3650 industrial pneumatic grinder with two different hose setups to demonstrate how performance can be affected:

  • One installation used hose of the manufacturer's recommended diameter (in this case ½ inch)
  • The other installation used a smaller diameter hose (3/8 inch in this case)
  • See the performance difference for yourself and be amazed!



    Always consult the tool manufacturer's recommendations to ensure that accessories fit the tool perfectly and offer the best level of performance.

    There are four important values ​​to consider when choosing your air line accessories:

  • air line size,
  • air inlet type,
  • maximum air consumption at load, 
  • recommended hose diameter/length.
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