Depth Stop; Operating Precautions; Drilling Recommendations - JET J-A3816 Manual De Instrucciones De Operación Y Piezas

The speed control handwheel is located on the
left side of the drill head. An LED speed
indicator is provided on the face plate on the drill
head.
Figure 7 – Operating Controls

Depth Stop

A drilling depth stop (refer to Figure 8) is
provided on the right side of the drill head. The
depth stop consists of a threaded rod with depth
setting jam nuts. The front side of the threaded
rod has a depth scale.
loosened and moved to the desired depth on the
scale. The upper jam nut is then tightened
against the lower nut.
Figure 8 – Depth Stop

Operating Precautions

The following operating and safety precautions
must be observed in order to avoid harm to the
operator or damage to the drill press.
1. The head assembly must be locked to the
column so the thrust produced by drilling will
not force the head assembly up the column.
The jam nuts are
10
2. The work table must be locked to the
column so it will not be forced down the
column.
3. Be sure the belt is tightened to the proper
tension.
4. DO NOT start to drill the workpiece until
making certain the workpiece is held down
securely.
5. BEFORE turning
handwheel in either direction.
6. Point of operation protection is required for
maximum safety.
responsibility of the user/purchaser since
conditions differ between jobs.
7. Make sure the drill is secured in the spindle
or check before attempting to use the drill
press.
8. Make sure the spindle taper is clean and
free of burrs, scoring, and galling to assure
maximum gripping.

Drilling Recommendations

Speeds for Drilling
The speed of a drill is usually measured in terms
of the rate at which the outer periphery of the
tool moves in relation to the work being drilled.
The common term for this is Surface Feet per
Minute (SFM). The relationship of SFM is
expressed in the following formulas:
= × ×
SFM . 0 26 RPM Drill
SFM
= ×
RPM 3 8 .
Drill Diameter
In general, the higher the speed the shorter the
drill life. Operating at the low end of the speed
range for a particular material will result in longer
life. The most efficient speed for operating a drill
depends on many variables:
1. Composition and hardness of material.
2. Depth of the hole.
3. Efficiency of the cutting fluid.
4. Type and condition of the drilling machine.
5. Desired quality of the hole.
6. Difficulty of set-up.
Indication of Extreme Speeds and Feeds
A drill that splits up the web is evidence of too
much feed or insufficient tip clearance at the
center as a result of improper grinding. The
rapid wearing away of the extreme outer corners
of the cutting edges indicates that the speed is
the speed control
This remains the
Diameter ( in Inches )
( in Inches )