ARO Bant-A-Matic 8248-B Manuale dell'operatore - Pagina 3

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Y--

--Y

Fig.1

IMPORTANT

RECOMMENDED METHOD FOR HOLDING DRILLS IN SPINDLES

To properly hold drill bit in collet and reduce the chance of slippage,

a flat must be ground on the shank end of the bit. The flat should

be approximately 5/16" (8mm) long and the depth should be 1/3 of

the bit diameter NOTE: If bit

too large to fit into locking insert (smaller

capacity Dual Spindles do not hove insert), a square must be ground

onto the shank end of the bit.

SET-UP PROCEDURE WITH OPTIONAL

HYDRAULIC CHECK

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Assemble hydraulic check to mounting bracket and assemble

mounting bracket to tool using washers (Y14-8) and cap screws

(Y154-48).

Measure distance from drill point to work piece - distance "Y".

Distance "X" between hydraulic check plunger and trip bracket

must be less than distance "Y" to prevent damage to drill point

when it approaches the work piece.

Loosen the cap screws (Y154-48) and position hydraulic check

to obtain correct setting for distance "X".

Tighten cop screws (Y154-48) securely before operating unit.

Increase the air flow thru the Feed Control Valve marked "F" by

opening two (2) full turns from closed position. This will allow drill

to advance rapidly until the trip bracket contacts plunger of hydraul-

ic check.

Insert bit into spindle and into locking insert (where applicable) In-

suring that one of the set screws locates squarely on the flat of the

bit. Tighten collet firmly, then tighten set screws. NOTE: DO NOT over-

tighten collet. NOTE: Intent of set screws is only to keep bit from turn-

ing in collet.

The Hydraulic Feed Rate Adjustment is located at the name plate

end of the Hydraulic Check Rotate extended spindle until the slot

on spindle IS located midway between the highest and the lowest

settings.

Start drill unit and the drill will advance at a rapid rate until the

trip bracket contacts plunger of hydraulic check.

Slowly rotate the Hydraulic Feed Rate counter clockwise for faster

feed rate or clockwise for slower feed rate.

TO CONTROL BREAKTHROUGH

Position hydraulic check so the distance between the plunger and

the trip bracket (distance "X") is less than the distance from the

drill point to the opposite side of the work piece (distance "W').

Set-up of the self-feed drill unit will be the same as explained in

Set-Up Procedure, page 1.

ADJUSTMENT SCREW "6"

FEED RATE ADJUSTMENT

* HYDRAULIC CHECK (SEE TABLE)

OUNTING BRACKET 40298

PARTS INDICATED BY ASTERISK (*) ARE INCLUDED

IN 40301-( ) HYDRAULIC CHECK ASSEMBLY.