3kw Chinese Spindle - ER20 denford triac question

[andy_con]

looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-...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]

looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-...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

Is this what you are looking for http://www.amazon.com/Dorian-Tool-ER.../dp/B00CB0Y7SI M25 x 1.5 Thread ..Clive

[andy_con]

perfect many thanks

[Clive S]

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]

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/Brid...ata_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]

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

[Chaz]

looking at replacing my sem servo motor with something like this

http://www.ebay.co.uk/itm/3KW-WATER-...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]

to little info on the Chinese spindles so ive not done it

[Chaz]

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.