Chinese Spindles

[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]

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.
.

How nice it would be if it was just the bearings, However im not that lucky so im not going to consider it....MUCH

[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

[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]

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 ...

[Jonathan]

Oh what's this!

http://www.google.co.uk/url?sa=t&rct...6srckLwoIqwSSA

http://www.aysipu.com/English/produc...sh/product.asp

SPP1030-10-17F, 10,000rpm, $1000

Getting closer to our goal...