Sherline or Taig spindle on their machine?

[cnctoolman]

Was wondering if anyone has tried/are using one on their machines. Sherline offers some nice looking ones under their industrial links. Can use an ER16 collets with them.

Just think the bonus would be easy to contact due to being in the states.

Here is a link

http://www.sherlinedirect.com/index....TOKEN=65037951

[draughted]

yep. they have been around a long time and i'am sure many will have experience with them.
i my self just bought a ER taig spindle to accompany my small router.

i have been scratching my head as to just how i am going to power it. it seems they max out at 10k rpm. i want some thing small and powerful to really keep the thing light, but i want something with a good solid speed control. i'd prefer a VFD controlled ac motor to a DC, but where will i get something AC that weighs less than a kilo?

[serriadh]

Originally Posted by draughted i'd prefer a VFD controlled ac motor to a DC, but where will i get something AC that weighs less than a kilo?

You might also consider other sorts of permanent magnet motor such as AC servo or brushless DC. Both will be more compact, easier to cool and just as useful when it comes to speed control and low-speed torque. AC servos offer a lot of power in a small package, but controllers for them are not cheap.

Probably best to avoid RC-type brushless DC motors which will almost certainly be too fast, and also avoid outrunner type motors which will be harder to mount and keep chips out of.

[jsheerin]

For an AC servo motor, get an AMC brushless drive off ebay. I've picked up several for ~$25 each. Make sure you get one that will work with the servo you're using (correct voltage). Also make sure you get a servo that has hall encoder signals (Yaskawas do as far as I know - Fanuc's don't). The AMC drives typically take +/-10V signals to control the speed, so you should be able to rig up a motor controller circuit fairly easily to control it from Mach3. Right now I run a 300W Yaskawa servo off an AMC drive for a hand held spindle sander I built. I run the drive in test mode and can vary the speed using one of the potentiometers on the drive. Eventually I plan on putting the electronics in an enclosure and mounting a knob on the outside to do the same thing. I did have one motor die on me so far - not sure why - but a second one is running fine. One downside is max speeds for servos are typically around 3000rpm. On the weight, I doubt you'd find a very powerful one that weighed less than 1kg, but they're still lighter than a typical 3ph AC motor which is why I'm using one.

[draughted]

ok, that sounds fine but i went to the AMC website and found a B30A40AC which suited my needs and found a supplier for that and it was $475 USD. a little more than i had in mind. it has the +/_10v input and 240v supply voltage 15 amp continuous and then it only has a 300 watt power rating.

can you tell me about what you use these servo motors on? what do you cut?
what is you spindle speed? dia bits? etc.

[jsheerin]

That's why you want to find one on ebay.