[ngwanhoe]

Please I am confuse.

Which collet set to buy?
What size milling bits?

Thanks for advice

OSAKI MINI MILLING MACHINE

Specifications:
Swing over bed: 180mm.
Drilling capacity: 13mm.
End milling capacity: 16mm.
Face milling capacity: 30mm.
Headstock travel (Z): 180mm.
Cross axis: 100mm.
Longitudinal axis: 220mm.
Spindle rotary angle: /- 45°.
Output power: 350W.
Spindle speed: Low range 0-1100rpm /- 10%. High range: 0-2500rpm /- 10%.
Spindle taper: MT3
T-slot: 12mm.
Net/Gross weight: 50/68kg.
Packing size: 540 x 500 x 760mm.

[Shane1234]

looks like you will need a MT3 collet set. as for tooling, that depends on the application. what do you plan on milling/drilling? that should be what you base your tooling choices from, and from what fits in your collets.

[Shane1234]

pricy but nice... T10070 16 pc. MT3 Quick Change Collet Set

[universalfab]

pricy but nice... T10070 16 pc. MT3 Quick Change Collet Set

They are decent for a hobbyist... The info they give for there product is surely a lie...

[ngwanhoe]

Thanks Shane123,

I am actually milling aluminium mostly, maybe steel once a while.

I can get them cheaper at ebay.

Anyway whats the differents ER20 , ER25 , ER32 etc??

[Shane1234]

Thanks Shane123,

I am actually milling aluminium mostly, maybe steel once a while.

I can get them cheaper at ebay.

Anyway whats the differents ER20 , ER25 , ER32 etc??

the difference in er collets is sizing and holders. er20 wont work with er32, etc.

[PixMan]

ER collet ranges:

ER16 - 10mm/.393"
ER20 - 13mm/.511"
ER25 - 16mm/.630"
ER32 - 22mm/.866"
ER40 - 30mm/1.18"

[ngwanhoe]

ER collet ranges:

ER16 - 10mm/.393"
ER20 - 13mm/.511"
ER25 - 16mm/.630"
ER32 - 22mm/.866"
ER40 - 30mm/1.18"

Thanks Pixman,
Does this means that the collet can only hold the aforsaid mm size / diameter of the cutters or drill bits?

[ngwanhoe]

I also notice the machine can change gears.

Spindle speed: Low range 0-1100rpm /- 10%. High range: 0-2500rpm /- 10%.

I know that drilling hard material or large drill bits use low speed and soft material or smaller bits can use high speed.

But why need to change gear as the high gear range is 0-2500rpm?

Confuse.....

[PixMan]

Not at all.

Those are just the maximum tool shank diameters that each ER collet size can handle. The collets for each range usually start at 0.5mm or 1mm in metric and 1/64" or 1/32" in "inch size" collets.

Not all companies make the inch sizes. The common ones are the metric, and each has a 1mm (approx. .040") range that it'll hold. For example, you buy a "3-2" collet, it'll take tools from .078" to .118". Don't try fitting a 1/8" (.125") tool in it, go up to a 4-3 collet.

Good quality collet makers such as Command and RegoFix (the best IMO) do make the "inch" sizes, and they'll be marked such as "3/8", meaning the maximum diameter it'll take. Those will clamp down from that max size to .040 lower. I prefer to use collets as close as I can get to (but NOT over) the tool shank diameter.

The gear change is used for the slower speeds when you have a larger diameter tool that uses more torque. Moving the gear train to a "back gear" usually affords more spinning mass for greater inertia.

[ngwanhoe]

Ah.. I understand now Pixman, thanks.