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View Full Version : 3kw Chinese Spindle - ER20 denford triac question



andy_con
31-07-2015, 12:38 PM
looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-COOLED-SPINDLE-MOTOR-3KW-VFD-VARIABLE-MILLING-DE-BEARING-PWM-/181765555080?pt=LH_DefaultDomain_3&hash=item2a52124388

as my machine has an ATC I need to get a pulley attached to the end of the spindle.

the plan would be to mod and existing pulley rather than make a new one, so question is where do I find thread details of an ER20?

many thanks

Clive S
31-07-2015, 12:57 PM
looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-COOLED-SPINDLE-MOTOR-3KW-VFD-VARIABLE-MILLING-DE-BEARING-PWM-/181765555080?pt=LH_DefaultDomain_3&hash=item2a52124388

as my machine has an ATC I need to get a pulley attached to the end of the spindle.

the plan would be to mod and existing pulley rather than make a new one, so question is where do I find thread details of an ER20?

many thanksIs this what you are looking for http://www.amazon.com/Dorian-Tool-ER20NTS35-Standard-Precision/dp/B00CB0Y7SI M25 x 1.5 Thread ..Clive

andy_con
31-07-2015, 12:58 PM
perfect many thanks

Clive S
31-07-2015, 01:09 PM
Andy Are you sure the spindle you linked to will do the job as they don't have any torque at low speeds say lower than about 3.5K rpm not like a servo ..Clive

andy_con
31-07-2015, 01:16 PM
Andy Are you sure the spindle you linked to will do the job as they don't have any torque at low speeds say lower than about 3.5K rpm not like a servo ..Clive

well...

I have a denford triac, its got a sem MT30U4 servo motor -

http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/_Manuals/SEM-MT_Technical_Data_Manual.pdf

although a very good motor with lots of torque it only does 4000rpm, so my feed rates are really slow. but yes I can do a 2mm deep cut in ally with an 8mm cutter, or a 1mm deep cut in ally with a 20mm cutter without any trouble.

what I was thinking was to get one of these Chinese spindles, swap the bearings out on my mill so they can handle the speed and do a 2:1 reduction. so id be looking at 12000rpm. so I would gain a bit more torque.

I don't actually need to run the spindle at slow speeds, I use threadmills for tapping etc...

Clive S
31-07-2015, 01:46 PM
Ok I was wondering if you needed position control on the spindle for the atc. That's not so easy on the spindle you linked too.. ..Clive

andy_con
31-07-2015, 02:15 PM
Ok I was wondering if you needed position control on the spindle for the atc. That's not so easy on the spindle you linked too.. ..Clive

nope don't need anything like that.

ive never been able to find a torque curve for one of these Chinese spindle are there any? im assuming its peak torque comes at full power?

Clive S
31-07-2015, 02:22 PM
nope don't need anything like that.

ive never been able to find a torque curve for one of these Chinese spindle are there any? im assuming its peak torque comes at full power?I suppose it should be in the manual:smile: but who knows.

andy_con
31-07-2015, 02:28 PM
I suppose it should be in the manual:smile: but who knows.


hahaha funny... ;-)

Chinese manuals don't have any information you need, just the information you don't need

Clive S
31-07-2015, 02:33 PM
hahaha funny... ;-)

Chinese manuals don't have any information you need, just the information you don't need Being up north you have to have a sense of humour If jonathan was on line he would most likely know that sort of info. Nice spindle though.

andy_con
31-07-2015, 02:42 PM
Being up north you have to have a sense of humour If jonathan was on line he would most likely know that sort of info. Nice spindle though.


be nice if I can get it in and working.

im just in the process of adding a 10 station atc to the machine, its currently only got 6

Chaz
03-11-2015, 09:51 PM
looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-COOLED-SPINDLE-MOTOR-3KW-VFD-VARIABLE-MILLING-DE-BEARING-PWM-/181765555080?pt=LH_DefaultDomain_3&hash=item2a52124388

as my machine has an ATC I need to get a pulley attached to the end of the spindle.

the plan would be to mod and existing pulley rather than make a new one, so question is where do I find thread details of an ER20?

many thanks

Hi, also looking at doing this. Any success?

andy_con
03-11-2015, 09:53 PM
to little info on the Chinese spindles so ive not done it

Chaz
03-11-2015, 10:14 PM
to little info on the Chinese spindles so ive not done it

I might give it a try, will confirm if and when I do.