When buying from your
local distributor, always
look for this label and set
your course for quality!
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J&M Retention Knobs are shot peened to relieve stress in the material, remove burrs, radius
corners, and improve the finish of the knob. This process improves the durability, extends
the life and reduces the likelihood of the Retention Knob cracking.
If the Retention Knob breaks when roughing with an end mill, the down time may be from
2 to 10 weeks depending on the severity of the damage. The repair may be as simple as replacing
the tool holder and Retention Knob and regrinding the spindle in-house to clean up any
damage that has been done. Or it may require the replacement of the spindle by factory
repairmen. The repair cost may run from $3,500 to as high as $40,000 per crash.
You can see that it is more cost effective to keep track of the Retention Knob's time in
use and the type of duty cycle they have had. For this reason,
J&M has Laser-Marked Retention Knobs with the month and year manufactured and serial number
on the flange (S/N 03/02- 000323).
This information can be used in a safety log to record the length of time and the type
of duty that the Retention Knob has seen in its life span. (For example, light duty situations
such as center drilling, or in heavy duty situations such as rough end milling.)
By monitoring the data from the magnetic particle inspection of the Retention Knob, a manufacturer
can deterine the life span of the Retention Knob in the different types of duty cycles
in their facility.
Serial Number
and Work Order:
These numbers are marked on the parts to maintain traceability and good manufacturing
practice. |
EXAMPLE:
S/N 03/02-00323
11973/01
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Part Number:
Part Number is marked on Knob making it easy to identify part number when Retention
Knob is in the tool holder. |
EXAMPLE:
JM11146
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