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  #1  
Old Tue 02 December 2008, 05:29
javeria
Just call me: Irfan #33
 
Bangalore
India
Belt-driven spindles

Copied from another thread:

take a look here G'

http://www.buildyouridea.com/cnc/pcb...pcb_drill.html
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  #2  
Old Tue 02 December 2008, 11:11
PEU
Just call me: Pablo
 
Buenos Aires
Argentina
Irfan, from that site I found also this spindle idea:
http://www.buildyouridea.com/cnc/Shr...e/spindle.html
I tought about doing something very similar for a long time.
What do you think about it Gerald?


Pablo
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  #3  
Old Tue 02 December 2008, 11:16
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Belt-driven spindles have been around much longer than high-frequency spindle motors.

Years ago I had great success with Habasit belts.
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  #4  
Old Tue 02 December 2008, 14:24
robertmonroe
Just call me: Robert
 
El Paso
United States of America
Just get the spindle and be happy.
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  #5  
Old Tue 02 December 2008, 23:59
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
This goes up to 10 000 rpm:
http://www.atlanticequipment.com/54.html
. . . . which is still a bit slow for the type of V-cutter work that Irfan is doing.

But you can see that a flat belt is used instead of a "O-ring" round belt. Drilling PCB's requires much, much less power/torque than v-carving.
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  #6  
Old Wed 03 December 2008, 00:46
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Some belt-driven spindles

We are using words than can cause confusion. . . . .

A "spindle" is simply a shaft running in bearings. Spindles have been around since the Industrial Revolution, when they were powered by steam engines and flat leather belts. Electric motors integrated inside the spindle are a newish invention, from when methods of making high-frequency AC became more available (via thyristors and VFD's).

"Electro-motor spindle" is a more correct term for the thing we simply call a "spindle" in the CNC world today. But let's not confuse ourselves, we more or less know what you mean when you say just "spindle"
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  #7  
Old Wed 03 December 2008, 07:01
Allegheny
Just call me: Brian
 
Massachusetts
United States of America
Has anyone ever considered using the spindle from an industrial drill press - or even from a vertical milling machine? The Z-axis motion would come from the spindle only and the motor would remain stationary. You can find these things in the 3+ hp range quite easily and with z motion of up to 6" or more - what I don't know is what the maximum rpm would be for the bearings, etc. I suspect that it would be well south of 20k, but it may be possible to address this by using "better" bearings on a spindle rebuild. By using the spindle from a turret mill, you would be able to use R8, or ER32-40 collets and create a real ATC as well.

Brian
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