Planmeca PlanMill 40 - Troubleshooting; Troubleshooting Tool Walking

2 Troubleshooting Chapter D: Troubleshooting
84 Planmeca PlanMill 40 Technical manual
2 Troubleshooting
2.1 Troubleshooting tool walking
Tool walking is a term used to describe an event where the tool (grinder or burr) moves
axially outward from the spindle during the grinding
Causes
• Tool walking is commonly caused by debris trapped between the tool shank and the
collet, and by debris trapped between the collet and the spindle shaft.
• Although more rare, tool walking can also be caused by a damaged collet or a
defective tool (i.e. wrong shank diameter, diamonds bonded to shank, etc.).
Other contributing factors
• Poor coolant delivery to the tool tip inhibiting removal of ceramic debris resulting in
higher cutting forces
• Excessive diamond wear on tool which results in higher cutting forces
• Incorrectly installed collet
• Defective clamping mechanism inside spindle
Solutions
1. Clean collets, spindle shafts, nozzle caps, suction strainer, strainer basket and fluid
tank. Refill tank with fresh water and coolant.
2. Replace any tools showing more than 160 milling minutes of usage.
3. Mill a job (preferably the same job that the tool walked during). If the problem still
exists continue to next step.
4. Observe the flow of coolant from the nozzle caps and verify that four coolant streams
from each nozzle cap are converging at the tool tips. Clean any deposits found in or
around the four nozzle holes on each cap. Replace any nozzle caps where the
deposits are unable to be removed or if the cap has been damaged in any way.
5. Evaluate all of the tubing for possible blockage. This includes the use of a soft bristle
tube brush inside the spindle housing coolant channel.
6. Contact Planmeca After Sales to install modified GRF files. Mill two or three jobs,
including the problematic job. If the problem persists continue to the next step.
7. Replace the collet. Mill two or three jobs, including the problematic job. If the problem
persists continue to the next step.
8. Replace spindle and verify the problem is resolved.