Anybody need an air bearing spindle ?

Anybody need an air bearing spindle ?

Post by Jon Elso » Fri, 05 Feb 2010 14:38:16



I just picked up a Professional Instruments
BlockHead 4R air bearing
spindle assembly.  It has an integral motor,
resolver, brake and shaft
encoder.  It was used in a disk drive development
lab, and currently has a
pneumatically activated clamp for a disk platter
mounted on it.
But, looking at the company web site (still in
business, the 4R is still
a current model) they use these for precision
grinding and other tool
applications, too.  It is rated for 10,000 RPM,
and has a radial stiffness of
0.67 Lbs/microinch.  I don't know the details of
the motor, whether it is
3-phase induction or PM brushless.  It appears to
be unused, as it still
has the factory shipping lock on the spindle.

This is a big unit, seems to weigh about 40 Lbs.
Does anyone have
any use for such an item (before I list it on eBay)?

Jon

 
 
 

Anybody need an air bearing spindle ?

Post by Buerst » Fri, 05 Feb 2010 20:41:19


What do you have in mind?  I need a spindle to spin a 6" cut-off disk to
trim End brushes.


Quote:
>I just picked up a Professional Instruments BlockHead 4R air bearing
> spindle assembly.  It has an integral motor, resolver, brake and shaft
> encoder.  It was used in a disk drive development lab, and currently has a
> pneumatically activated clamp for a disk platter mounted on it.
> But, looking at the company web site (still in business, the 4R is still
> a current model) they use these for precision grinding and other tool
> applications, too.  It is rated for 10,000 RPM, and has a radial stiffness
> of
> 0.67 Lbs/microinch.  I don't know the details of the motor, whether it is
> 3-phase induction or PM brushless.  It appears to be unused, as it still
> has the factory shipping lock on the spindle.

> This is a big unit, seems to weigh about 40 Lbs. Does anyone have
> any use for such an item (before I list it on eBay)?

> Jon


 
 
 

Anybody need an air bearing spindle ?

Post by Jim Stewar » Sat, 06 Feb 2010 02:33:23


Quote:

> What do you have in mind?  I need a spindle to spin a 6" cut-off disk to
> trim End brushes.

I think you would be disappointed with the results.
Air bearings need very clean dry air to work and
probably wouldn't be happy with the amount of side
load you'd be applying.
Quote:


>> I just picked up a Professional Instruments BlockHead 4R air bearing
>> spindle assembly.  It has an integral motor, resolver, brake and shaft
>> encoder.  It was used in a disk drive development lab, and currently
>> has a
>> pneumatically activated clamp for a disk platter mounted on it.
>> But, looking at the company web site (still in business, the 4R is still
>> a current model) they use these for precision grinding and other tool
>> applications, too.  It is rated for 10,000 RPM, and has a radial
>> stiffness of
>> 0.67 Lbs/microinch.  I don't know the details of the motor, whether it is
>> 3-phase induction or PM brushless.  It appears to be unused, as it still
>> has the factory shipping lock on the spindle.

>> This is a big unit, seems to weigh about 40 Lbs. Does anyone have
>> any use for such an item (before I list it on eBay)?

>> Jon

 
 
 

Anybody need an air bearing spindle ?

Post by Jon Elso » Sat, 06 Feb 2010 09:17:50


Quote:


>> What do you have in mind?  I need a spindle to spin a 6" cut-off disk
>> to trim End brushes.

> I think you would be disappointed with the results.
> Air bearings need very clean dry air to work and
> probably wouldn't be happy with the amount of side
> load you'd be applying.

Depending on the air pressure available, I think this unit can sustain a
radial working load of 50 Lbs.  Yes, it does need clean dry air, as the
clearances in the bearing are INSANELY small, and you have to keep the
journal from rusting.

Jon

 
 
 

Anybody need an air bearing spindle ?

Post by Jon Elso » Sat, 06 Feb 2010 14:42:20


Quote:

> What do you have in mind?  I need a spindle to spin a 6" cut-off disk to
> trim End brushes.

You can look this up on the Professional
Instruments web site, it is the
4R spindle.  See http://www.airbearings.com/4r
for more info.  But, the unit I have has quite a
bit more stuff on it, with drive
motor, resolver, brake and shaft encoder.  All
these things look like they's
be easy to take off to fit your application.  The
business end has a ring
of bolt holes to attach whatever you want on it.
You ought to know this thing
likely cost $30,000 new in the form I have it in.

Jon

 
 
 

Anybody need an air bearing spindle ?

Post by oldja » Sun, 07 Feb 2010 12:40:52



Quote:
> I just picked up a Professional Instruments
> BlockHead 4R air bearing
> spindle assembly.  It has an integral motor,
> resolver, brake and shaft
> encoder.  It was used in a disk drive development
> lab, and currently has a
> pneumatically activated clamp for a disk platter
> mounted on it.
> But, looking at the company web site (still in
> business, the 4R is still
> a current model) they use these for precision
> grinding and other tool
> applications, too.  It is rated for 10,000 RPM,
> and has a radial stiffness of
> 0.67 Lbs/microinch.  I don't know the details of
> the motor, whether it is
> 3-phase induction or PM brushless.  It appears to
> be unused, as it still
> has the factory shipping lock on the spindle.

> This is a big unit, seems to weigh about 40 Lbs.
> Does anyone have
> any use for such an item (before I list it on eBay)?

> Jon

I might have a use for it.  What is the overall length?
 
 
 

Anybody need an air bearing spindle ?

Post by Buerst » Sun, 07 Feb 2010 18:42:02



Quote:

>> What do you have in mind?  I need a spindle to spin a 6" cut-off disk to
>> trim End brushes.
> You can look this up on the Professional Instruments web site, it is the
> 4R spindle.  See http://www.airbearings.com/4r
> for more info.  But, the unit I have has quite a bit more stuff on it,
> with drive
> motor, resolver, brake and shaft encoder.  All these things look like
> they's
> be easy to take off to fit your application.  The business end has a ring
> of bolt holes to attach whatever you want on it. You ought to know this
> thing
> likely cost $30,000 new in the form I have it in.

> Jon

It sounds like I should pass.  I hope somebody needs it "REAL BAD"!
 
 
 

Anybody need an air bearing spindle ?

Post by Gunner Asc » Mon, 08 Feb 2010 11:17:09




Quote:
>I just picked up a Professional Instruments
>BlockHead 4R air bearing
>spindle assembly.  It has an integral motor,
>resolver, brake and shaft
>encoder.  It was used in a disk drive development
>lab, and currently has a
>pneumatically activated clamp for a disk platter
>mounted on it.
>But, looking at the company web site (still in
>business, the 4R is still
>a current model) they use these for precision
>grinding and other tool
>applications, too.  It is rated for 10,000 RPM,
>and has a radial stiffness of
>0.67 Lbs/microinch.  I don't know the details of
>the motor, whether it is
>3-phase induction or PM brushless.  It appears to
>be unused, as it still
>has the factory shipping lock on the spindle.

>This is a big unit, seems to weigh about 40 Lbs.
>Does anyone have
>any use for such an item (before I list it on eBay)?

>Jon

Ping Buerste  That would make a great 10k spindle for his project!

Gunner

 Whenever a Liberal utters the term "Common Sense approach"....grab your
 wallet, your ass, and your guns because the som*** is about to do
 something damned *** to all three of them.