Foredom K.1050 - Manual (Page 8)

Using the Motor Handpiece (MH-150)
Changing Accessories
Burs and other accessories can be inserted or
removed from the handpiece collet when the collet
is open. To open the collet:
1. Turn off the motor using the Motor On/Off
Switch
3 and the Power Switch 12 .
2. Twist the Chuck Handle in the “R” or release
direction (clockwise) until the raised indicator bar
clicks into the far left mark (
Í
> ) on the silver
center ring (Fig.11).
2. Remove the accessory and replace with another
accessory. Insert the ‘new’ accessory shank fully
(about 1
1 ⁄
8
″) into the collet for maximum support.
You should feel it touch the back of the collet.
4.Twist the knurled Chuck Handle toward the “S”
or secure position by turning counter-clockwise
until it snaps to lock the collet. The accessory and
the collet will be able to spin freely. The raised
collet indicator bar will be above the far right
( <
Í
) mark in the silver center ring.
Note: The intermediate position between “S” and
“R” holds both the spindle and the accessory in a
locked position. This is useful to unscrew an
over-tightened mandrel screw.
Never turn the power on when the collet
is open or in the intermediate position.
The spindle is in the locked position and
will not turn. This will damage the
motor.
How to Remove and Install the Collet
1. With knurled Chuck Handle in “R” release position
and bur or accessory in collet, place triangular hole
in Chuck Wrench 23 over triangular flats of Collet
head and unscrew the collet counter-clockwise (Fig.
12) Remove collet.
2. With bur or accessory in new collet, thread into
handpiece. Place triangular hole in Chuck Wrench 23
over triangular flats of Collet head and tighten the
collet clockwise. Be careful not to over-tighten. Test
to insure that new collet releases accessory smoothly
in the “R” released position. Test to insure that new
collet holds firmly in the “S” secure position and
spindle rotates freely.
[Fig.12]
7
chuck handle
bur
triangular hole
23
Collet Collet
Part No. Size
HP4-117 2.35mm (3/32 ″)
HP4-117B 3.18mm (1/8
″)
HP4-117C 3.00mm
HP7-5008 2.35mm (3/32
″)
HP7-5007 3.18mm (1/8
″)
HP7-5006 3.00mm
Handpiece
Serial Nos.
808xxxx
and above
807xxxx
and below
To order the correct Replacement
or Additional Collet check the
Handpiece Serial Number