Diamond Core Bit Retipping

Before

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In process

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After

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REPAIR / RETIPPING / RESEGMENTING

Concrete Core Bits

Blackthorn, Inc.

Procedures from State-Of-The-Art Technology

1) We visually examine the bit for any dents or out-of-round deficiencies.

2) We clean the bit and re-examine it more closely for cracks or “hot spots”.

3) We measure the wall thickness of the bit to determine how much material must be removed in order to get the bit back to the original, factory-specified metal thickness at the segment mounting point.

4) We mount the bit on a rotating vise. Then, using a steel cutter, we cut the bit to the predetermined length. Prior to cutting off the deteriorated portion of the barrel, we again check for out-of-round, using a dial indicator.

5) After the bit has been cut off to the proper length, we again check for cracks in the barrel of the core bit. If the barrel is suspicious, we use a magna flux test to determine the presence or absence of any crack(s). Any crack found would eliminate the bit for resegmentation. If the barrel passes these tests, it is then “dressed down” to a finished length.

6) We notch the bit, if possible.

7) We calculate the number of segments required to restore the bit to its original size.

8) We make a layout to properly position the segments.

9) Using state-of-the-art magnetic fixturing tools, we mount the segments on the barrel at the proper spacing. Using factory-specified silver solder, we solder the segments to the barrel.

10) After the segments are mounted, we re-finish the core bit barrel.

11) The bit now goes through final inspection and testing prior to shipping.

NOTE: Blackthorn, Inc. uses 1" segments. Recent industry studies have proven that using a shorter segment allows for more diamond surface to the concrete. (Example: using 1.5" segments covers approximately 54% of a barrel’s end. Using 1" segments on the same barrel covers approximately 64% of its end.) This added diamond surface translates into maximizing cutting capabilities.