Proxxon FF 500 Manual De Instrucciones página 12

1. Release swivel nut 4 (Fig. 7) at the milling spindle.
2. Put the desired collet chuck 5 by hand in the swivel nut 4 (Fig.
8) and allow to engage with slight axial pressure at the continu-
ous groove. Caution! The thinner end of the collet chuck must
point up, as shown in the figure.
3. Insert swivel nut 2 with the collet chuck in spindle 1 (Fig. 7, see
small illustration) and tighten lightly by hand.
4. Insert shaft of tool 3 in the collet chuck.
5. Use the supplied wrench to tighten the swivel nut, as shown in
Fig. 7.
6. To remove the collet chuck, release swivel nut 4 and pull out tool 3.
7. Now remove the swivel nut with collet chuck completely out of
the milling spindle.
8. Disengage the collet chuck with the supplied tube section 6
(Fig. 8) by pressing on the cone of the collet chuck and remove
from the swivel nut.
4.4 Changing the spindle speed
Setting the spindle speed is necessary so that the cutting speed
of the tool can be adapted to the characteristics of the material
to be machined and to the tool geometry.
Large tool diameters at equal rotational speed also mean a large
circumferential speed and thus potentially a large cutting speed.
Conversely, the same is also true for small tool diameters.
This makes it necessary to be able to vary the rotational speed.
To do so, a belt drive guides the motor power at the milling cutter
to the spindle. This is a two-stage gearbox with an intermediate
gear for general speed reduction and two ratchet wheels with re-
spectively different diameters in pairs. These are connected by
two poly-V belts that are excellently suited for this purpose due
to their quiet running and transfer characteristics. The respecti-
vely required spindle speeds can be realised by shifting the belts.
A total of 6 spindle speeds can be set: 180, 350, 550, 800, 1300
and 2500/min. Fig. 9 shows the respective belt pulley combinati-
ons of the individual rotational speeds.
Before working on the belt drive, always disconnect the plug
from the power socket! Risk of injuries!
1. Release knurled screw 1 (Fig. 10) and swing up the housing cover.
2. Slightly release fastening screws 1 (Fig. 11, small detail) and
shift the housing somewhat to the right until the lower drive
belt relaxes.
3. Bring the lower V-belt 2 into the corresponding position. The
corresponding positions are shown in Fig. 9. Use the sticker on
the inside of the housing as orientation.
4. Shift the housing back to the left until the drive belts are pro-
perly tensioned and re-tighten the fastening screws (1, Fig. 11).
5. Close the housing lid and re-tighten the knurled screw 1 (Fig. 10).
The belt cover and/or housing cover must always be closed du-
ring operation!
5 Milling
Always wear protective goggles during milling. Comply with the
safety regulations without fail!
The work piece to be processed must always be securely faste-
ned to the cross table! There are various possibilities available to
you: Clamping jaws (e.g. 24 257 from PROXXON), vices (e.g. 24
255 from PROXXON) are very well suited. If divisions are to be
manufactured, it is possible to work with dividers or feed recei-
vers, for example. You will find examples for clamping devices
and accessories in our equipment brochure, on the internet at
www.proxxon.com, also together with other valuable notes, in
our "Manual for the Creative Modeller" (Art. No. 28 996).
- 12 -
Caution!
Caution!
Caution!
5.1 Setting the milling depth and milling procedure
Please observe the section "Height adjustment of the spindle".
This explains the methods used to set the height of the milling
spindle for the various application ranges.
In practise, after first tightening the work piece and then roughly
clamping the milling cutter (approx. 2 mm above the work piece),
adjust the spindle and then adjust the milling depth while you
work.
You can work with either the handwheel or the drilling feed.
If the infeed (the dimension by which the milling cutter dips into the
work piece) should have a certain amount on the other hand, then
this can be achieved by using the scale ring of the handwheel as well
as the drilling feed.
Both can be "zeroised". To do so, for example and before (!) you
switch on the machine, position the milling cutter lightly on the work
piece (but without touching it!) and then adjust the respective scale
ring to zero. Please remember to release the screw for the scale ring
of the drilling feed as described in "Height adjustment of the
spindle". The scale ring of the handwheel is simply turned; so re-
member: the Z carriage traverses by 2 mm per revolution.
This is how to proceed:
1. Securely fasten the work piece with clamping jaws, vice or
chuck.
2. Roughly adjust the desired spindle height by handwheel 1 (Fig.
5). To do so, Allen screw 3 must be open, but toggel screw 4
but must tightened! If necessary, "zeroise" the scale rings as
described in the text above.
3. Make sure that the milling cutter does not touch the work
piece.
4. Make sure that the correct spindle speed is set.
5. Select direction of rotation! (See below at "Feed".)
6. If the milling depth will be varied during milling, then this works
best by using the handwheel 1 (Fig. 5). Here, Allen screw 3 is
open, toggle screw 4 is closed. If the milling depth will not be
changed after the adjustment (e.g. while face milling a work
piece), we recommend keeping both screws 3 and 4 closed.
7. Alternatively, you can regulate the milling depth with the drilling
lever 2 (Fig. 5). To do so, tighten Allen screw 2 when the car-
riage is in the desired position. After actuating the drilling lever
2 to the desired depth, the achieved position is locked by
tightening toggle screw 4 to clamp the quill.
8. Switch on the milling machine using switch 3 (Fig. 1).
9. Work with the adjusted feed.
5.2 Feed:
During milling, make sure that the feed always occurs against the
cutting direction of the milling cutter (Fig. 12).
6 Accessories
Commercially availabe milling cutters with a maximum shaft dia-
meter of 12 mm and a tool diameter of approx. 40 mm can be
used. For an optimal working result, it is necessary to adapt the
milling cutter as well as the milling parameters (feed, milling
depth, rotational speed) to the working conditions and to make a
choice from these. Naturally this includes observing the table on
the V-belt cover of the milling cutter.
We recommend the milling inserts from our accessories program,
such as the end mill cutter set (2-5 mm) 24610 or - for larger
work - the end mill cutter set (6-10 mm), article no. 24620.
Gears with the module m=0.5 can be milled using the tooth form
cutters from our accessories program; teeth numbers from 12 -
54 can be realised.
You will find further suitable milling and drilling tools in PROXXON
qualitiy from our comprehensive program in specialist shops.
They will be able to recommend a suitable PROXXON product for
your special application case.