collet chuck vs collet arbor used on lathe headstock spindle

collet chuck vs collet arbor used on lathe headstock spindle

This topic has 9 replies, 7 voices, and was last updated 14 July 2022 at 17:05 by old mart.

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14 July 2022 at 09:00 #605748
Y C Lui
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@yclui16187
My Emco Compact 8 lathe is equipped with a ER25 collet chuck which can hold workpieces of diameter up to 16 mm. The spindle has a MT3 taper bore so it should be possible to put in a MT3 ER32 milling arbor to hold larger workpieces. I am wondering if this is a good idea because if this works Emco would not have made a collet chuck. Inquiring mind will appreciate some answers .
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14 July 2022 at 09:00 #11266
Y C Lui
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@yclui16187
14 July 2022 at 09:20 #605749
Paul Lousick
Participant
@paullousick59116
The collet chuck will allow you to pass long pieces thru the spindle bore. A 3MT-ER32 will hold larger diameters but not pass anything thru the bore. Both have their advantages. An ER32 collet chuck is a better option

Edited By Paul Lousick on 14/07/2022 09:21:48
14 July 2022 at 09:23 #605750
Clive Brown 1
Participant
@clivebrown1
Presumably your collet chuck allows long pieces of bar to pass through the spindle.A chuck which is mounted on an MT would prevent this
14 July 2022 at 09:23 #605751
Emgee
Participant
@emgee
Sounds OK for short work pieces, but check the MT3 socket will take a full length MT3 taper because many of the 5 series spindles need a reduction for a small length of the taper diameter at the small end.

Emgee
14 July 2022 at 11:04 #605764
bernard towers
Participant
@bernardtowers37738
Make your own spindle mounted collet chuck or buy an er25 flange mount collet chuck and make a backplate , also get oversize collets to 20 mm.
14 July 2022 at 11:20 #605769
Paul Lousick
Participant
@paullousick59116
Bernard. The first line of the post states " My Emco Compact 8 lathe is equipped with a ER25 collet chuck"

Edited By Paul Lousick on 14/07/2022 11:21:27
14 July 2022 at 12:39 #605781
bernard towers
Participant
@bernardtowers37738
SORRY MISREAD
14 July 2022 at 14:25 #605791
DC31k
Participant
@dc31k
If you go for a MT3-mounted chuck, you will need a drawbar if you are to subject it to anything but axial compression loads.
14 July 2022 at 17:05 #605810
old mart
Participant
@oldmart
You might be able to get a MT3 er40 collet chuck if larger size is important.
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