Chinese Spindles

[i2i]

there is also a model with a cam to operate the atc fitted to the top of the spindle which will allow a direct drive motor, i'll see if i can find the link.

[JAZZCNC]

Can anybody read chinese.? I would really like to know what this says and motor spec.
http://www.aliexpress.com/fm-store/9...200W-400W.html

I think I'm reading it for the 400W motor has.
60V
8.4A
1.27Nm continous
3.82 peak
3000rpm

At £170 for motor and drive this is cheap and not worth messing with steppers. Don't think it includes encoder like but still I'm sure they will be on there some where cheap enough.?

Edit: Maybe it does include encoders becasue I'm sure the bit say 2500(chinese squigle) means 2500ppr the squigle bit I hope means x 4 for quadriture so 10,000PPR encoders.?

[Jonathan]

Thats what I meant with using the Tormach cartridge but this would be perfect, just add air cyclinder and your ready to go. Good shout i2i. .

Now who can I tapup for $900.??? .

Er, don't see what all the fuss is about - it's only rated for 6000rpm. Unless some of the others in that table are also ATC spindles...
It looks like BT30 taper tooling is capable of much more than 6000rpm, so it makes you wonder why that spindle can't do it - is it just not balanced very well, or cheap bearings? That would explain the price.

Can anybody read chinese.?

I know some people who can - I can ask them on Monday if you like.

[Ricardoco]

http://www.aliexpress.com/product-fm...olesalers.html

Use your own motor to suit,

i2i to the rescue.... now we're cooking on gas, this looks like what im gonna go with, all the work is done for me Hmmmmmm

[Ricardoco]

there is also a model with a cam to operate the atc fitted to the top of the spindle which will allow a direct drive motor, i'll see if i can find the link.

again that sounds like just the job

[Jonathan]

i2i to the rescue.... now we're cooking on gas, this looks like what im gonna go with, all the work is done for me Hmmmmmm

I thought you wanted higher speed than that?

To get '>6000rpm and 1000rpm should the need arise' is challenging. The vast majority of spindles use induction motors and to get the variable speed we use a VFD. The problem with this is you can only get full power down to about half the motor's rated rpm, then below that it drops linearly. So in short either you use a massively overrated motor, or have belts so you can change the drive ratio and keep the motor operating in the rated power region. On my micro lathe I went for the former, which would have been expensive except I had already got the motor.

[Ricardoco]

again that sounds like just the job

OMG £650 Delivered!!!!! thats music to my ears...

[Ricardoco]

I thought you wanted higher speed than that?

To get '>6000rpm and 1000rpm should the need arise' is challenging. The vast majority of spindles use induction motors and to get the variable speed we use a VFD. The problem with this is you can only get full power down to about half the motor's rated rpm, then below that it drops linearly. So in short either you use a massively overrated motor, or have belts so you can change the drive ratio and keep the motor operating in the rated power region. On my micro lathe I went for the former, which would have been expensive except I had already got the motor.

Hi jonathan, the real requirement is the atc, and i had the idea that the chinese water cooled spindles could be converted but due to the questions that arose in the thread including tool balancing, questions about hollowing the shaft and physical workable material in the shaft i thought it may be better to opt for a tormach like solution with atc which is where the man i2i has come up with the goods, the speed was just a side effect of the spindle rather than a requirement for the project, sorry if i was not clear on that... but then i never was the sharpest pencil in the box ...

[JAZZCNC]

Er, don't see what all the fuss is about - it's only rated for 6000rpm. Unless some of the others in that table are also ATC spindles...
It looks like BT30 taper tooling is capable of much more than 6000rpm, so it makes you wonder why that spindle can't do it - is it just not balanced very well, or cheap bearings? That would explain the price.

Try making a real ATC with ground and hardend spindle for less than £650 I can't imagine it would be much cheaper and certainly no bettter.

But I do agree the 6K is a bit on the low side for some jobs 10K minimum would be nicer, 30K Woopie dooo.

Thanks for offering about asking for translation, yes please.

[Ricardoco]

Try making a real ATC with ground and hardend spindle for less than £650 I can't imagine it would be much cheaper and certainly no bettter.

But I do agree the 6K is a bit on the low side for some jobs 10K minimum would be nicer, 30K Woopie dooo.

Thanks for offering about asking for translation, yes please.

Jazz i agree but i would rather sacrifice the speed and keep the ATC, 10k would be the max i would need anyhow, the things i do are done on a machine running less than 6k and im resigned to it, so when i started the gantry design the speed wasnt really a question more the ATC of course if you can find similar to i2i at a faster speed for £800 or so then i would not object.. LOL