5 pilot drill depth adjustment – Castle TSM-21 Serial 64234 and above (Bosch) Operator Manual User Manual

Page 20

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CASTLE, INC

TSM-21 OWNERS MANUAL V2.0

Page 20 of 41

4.5 Pilot Drill Depth Adjustment

The Pilot Drill operation works best when the drill depth is adjusted so that the drill bit just barely

breaks into the pocket. If the drill bit extends farther than necessary, it can cause shorter bit life

and over-size holes. The drill bit is set at the factory for a length of approximately 1

13

/

16

” from tip

to drill motor collet (this is a suitable distance for the factory default

7

/

8

” Web). As a general rule,

if the Web is decreased, then the Pilot Drill depth should also be decreased.

To adjust the Pilot Bit Depth:

• For your convenience, a blank Bit Gauge (Fig 13) is included with your machine so that

you may scribe a mark to record the depth that is most suitable for your purposes.

Fig 43 Fig 14

• Simply set the Bit Gauge on top of the collet and use any sharp object to scratch a

reference line in the soft aluminum where each bit should be. (Fig 14)

• The plate has two sides that can be used as settings for different processes in the shop.
• Remove the Pilot Drill Motor as described in the section for “Tool Changes”.
• Loosen the motor collet and slide the bit to the desired height. (If the bit does not move

easily, try gently tapping on the shank of the bit near the collet with a wrench.)

• Secure the collet and reinstall the router motor.

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