Description
Drill Unit Options:
The series 250 self-feeding drill units can be equipped with the following options:
No Feed Control - Model 250
Feed Control - Model 252
Deep Hole (Peck) Drilling - Model 253
Self-Reversing Tapping Head Attachment - 3250 Tapping Heads
Multiple Spindle Heads with Adjustable or Fixed Spacing
Depth Control:
The stroke length of model 250, 252, & 253 series drill units can be controlled by a stop screw dial and nut which is fully adjustable from zero to the entire stroke range as ordered (1-1/2", 2", 3", 4", 6", & 8" Stroke Lengths). Depth control is achieved to within about .001" to .002" inch.
Lubrication:
The internal seals of the self-feeding drill unit must be lubricated with a light spindle oil to reduce friction and wear. A filter regulator and lubricator can be purchased from Blackalloy™. Although the spindle and spline bushing are generously lubricated at the factory with grease, continuous use and hostile environments may require manual lubrication on a frequent, scheduled basis.
Drive Motors:
Self-feeding drill units are usually powered by electric or air motors up to 1/2 HP and are usually belt driven through pulleys or driven directly through a flexible shaft coupling. The rear bearings are adequately sized to withstand normal pulley belt loads. However, over-tight belt tension may cause over loaded bearings and reduce bearing life.
Recommended Spare Parts:
Normal wear items that may require replacement depending on length of service and operating conditions are all bearings and seals. These can be purchased as kits to keep on hand to reduce down time. For critical installations where down time must be minimized, a complete spare drill unit should be kept on hand.
Installation:
Self-feeding drill units may be mounted in any attitude, i.e., horizontal, vertical or inclined as long as a sturdy and very flat support for both end blocks is provided, so as not to strain or distort the assembly. Three 1/4”-20 tapped holes are provided for mounting the unit, and a 1/4" dowel hole and 1/4" keyway are located in-line with the spindle, to facilitate line up and to insure exact repositioning. Flush out all chips and debris from air or oil lines before connecting to unit.
