Helpful Hints - Dremel 220 Manual De Usuario

Operation(continued)
12. Mark the hole locations on the work-
piece and center punch at these loca-
tions. Center punching will prevent walk-
ing of the drill point and ensure proper
hole location, The benefits of center
punching are less drill breakage and
better hole size tolerance,
13. Secure the workpiece to the base before
drilling. This will keep the workpiece
from climbing the drill bit or spinning.
The benefit is safety and better quality
work. Hold down clamps (not included)
are very good for holding workpieces, or
use a small utility vise for holding the
workpiece when drilling (Figure 6).
14. Loosen the Height Adjustment Lock
lever 1/2 turn and move the press on the
tube until drill bit tip is near the work-
piece. (A maximum of 1/4" between drill
bit tip and workpiece is recommended.)
Retighten lock lever.
15. Grasp the Press Handle and pull down
to drill hole.
Figure 6. Workpiece Hold Downs
Clamps (not supplied)
Figure 7. Round Workpiece
Helpfulhints
When drilling round pieces, use a "V" block or
vise. To drill a hole in the center of a round
piece, a center punch mark is necessary
(Figure 7). Use center punch to make center
punch mark (not included).
Avoid force feeding to such an extent that the
motor speed is noticeably reduced. Also,
feed carefully when approaching point of
breakthrough. This will avoid making ragged
breakthrough edges.
For accurate drilling, lower the tool to a loca-
tion where the end of the drill bit is within 1/4"
of the workpiece before advancing the han-
dle for feeding the drill. Using minimum
stroke and center punching at the location to
be drilled will ensure accurate drilling.
Making optional h olddownclampsfor
yourWorkStation220
Hold down clamps can be fabricated out of
wood, steel or aluminum, depending on your
application.
1. Cut or saw material to desired length,
width and height.
2. Drill a hole using a 5/16" or 21/64" drill
bit in the desired location, through the
clamp.
3. Mount the hold down clamps using a
5/16"-18 x 1-1/2" or 2" length carriage
Wing Nut _
/
Washer
Hold Down _
Spacer
CarriageBolt
L'q_j
Figure 8. Making Optional Hold
Down Clamps
bolts with matching washers and wing
nuts.
4. Mount to base by sliding the head of the
carriage bolt up through the bottom of
the base with the wing nuts on top.
When using hold down clamps on work-
pieces larger than 1/4" in thickness, always
use a spacer block to support the back side
of the clamp (Figure 8). For the best support,
the spacer block should be cut about 1/8"
shorter in height than the workpiece.