I recently got a good deal on a new old stock Bison 10" independent 4
jaw. Its the model with the FPJ logo instead of the actual Bison logo.
In my search to make sure I had actually gotten a chuck made by Bison I
ran across references to how fast you can spin a chuck. I'd never
really thought about it before.


The lathe I plan to use it on turns upto 2000 RPM. I have for short
periods spun the 10" import chucks that came with the machine at that
speed. Other than taking a little while to come up to speed I never
noticed any adverse issues. However! I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck? Is there a
reference where I can look it up? What about the cheaper 10" import 3
jaw that came with the lathe or for that matter the cheaper 10" 4 jaw
that came with it?

On 11/01/18 18:38, Bob La Londe wrote:
I recently got a good deal on a new old stock Bison 10" independent 4
jaw.Â* Its the model with the FPJ logo instead of the actual Bison
logo. In my search to make sure I had actually gotten a chuck made by
Bison I ran across references to how fast you can spin a chuck.Â* I'd
never really thought about it before.


The lathe I plan to use it on turns upto 2000 RPM.Â* I have for short
periods spun the 10" import chucks that came with the machine at that
speed.Â* Other than taking a little while to come up to speed I never
noticed any adverse issues.Â* However!Â* I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck?Â* Is there a
reference where I can look it up?Â* What about the cheaper 10" import 3
jaw that came with the lathe or for that matter the cheaper 10" 4 jaw
that came with it?


The few Bison chucks I have bought new have always come with a data
sheet that covers the range of models and safe speeds so i would expect
you to be able to look it up on their website.

"Bob La Londe" wrote in message
news
I recently got a good deal on a new old stock Bison 10" independent 4 jaw.
Its the model with the FPJ logo instead of the actual Bison logo. In my
search to make sure I had actually gotten a chuck made by Bison I ran
across references to how fast you can spin a chuck. I'd never really
thought about it before.


The lathe I plan to use it on turns upto 2000 RPM. I have for short
periods spun the 10" import chucks that came with the machine at that
speed. Other than taking a little while to come up to speed I never
noticed any adverse issues. However! I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck? Is there a
reference where I can look it up? What about the cheaper 10" import 3 jaw
that came with the lathe or for that matter the cheaper 10" 4 jaw that
came with it?



http://www.lathe.com/toolmex/2011Bis...CatalogRev.pdf

Best Regards
Tom.


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On 1/11/2018 12:08 PM, Howard Beel wrote:

"Bob La Londe" wrote in message
news
I recently got a good deal on a new old stock Bison 10" independent 4
jaw. Its the model with the FPJ logo instead of the actual Bison logo.
In my search to make sure I had actually gotten a chuck made by Bison
I ran across references to how fast you can spin a chuck.Â* I'd never
really thought about it before.


The lathe I plan to use it on turns upto 2000 RPM.Â* I have for short
periods spun the 10" import chucks that came with the machine at that
speed.Â* Other than taking a little while to come up to speed I never
noticed any adverse issues.Â* However!Â* I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck?Â* Is there a
reference where I can look it up?Â* What about the cheaper 10" import 3
jaw that came with the lathe or for that matter the cheaper 10" 4 jaw
that came with it?



http://www.lathe.com/toolmex/2011Bis...CatalogRev.pdf

Best Regards
Tom.

---
This email has been checked for viruses by AVG.
http://www.avg.com



Great reference. Thank you. It seems to indicate a D1 style 10"
independent 4 jaw will spin fine upto 2000 RPM as long as the work piece
is round and centered.

In another spot in that reference it says this "€¢Never exceed maximum
speed(RPM) of the chuck. The MAX RPM is stamped on the chuck face.
Refer to the table on page 356 for recommended maximum speeds for
self-centering chucks." Mine is not self centering, but it is stamped
with:

* 4344-8/5 (I assumed this was a model or part number, but have not
been able to verify)
* 2589 (could be rpm stamp)
* 90 (no clue)

Looks like its not likely to explode at the 2000 RPM max of the lathe
its going to get used on.

As I scanned through that reference it seems most 10" Bisons are rated
to 2000 RPM, a few are rated higher and a few are rated lower. Most
lower being 1900, but atleast one was listed as low as 1500. Certainly
its worth checking.

I ran across another reference which indicates 43** models in 10" are
rated for 2450 with steel body and 1500 for cast iron body.

On Thu, 11 Jan 2018 12:53:50 -0700, Bob La Londe wrote:


Great reference. Thank you. It seems to indicate a D1 style 10"
independent 4 jaw will spin fine upto 2000 RPM as long as the work piece
is round and centered.

In another spot in that reference it says this "+ICI-Never exceed maximum
speed(RPM) of the chuck. The MAX RPM is stamped on the chuck face.
Refer to the table on page 356 for recommended maximum speeds for
self-centering chucks." Mine is not self centering, but it is stamped
with:

* 4344-8/5 (I assumed this was a model or part number, but have not
been able to verify)
* 2589 (could be rpm stamp)
* 90 (no clue)

Looks like its not likely to explode at the 2000 RPM max of the lathe
its going to get used on.

As I scanned through that reference it seems most 10" Bisons are rated
to 2000 RPM, a few are rated higher and a few are rated lower. Most
lower being 1900, but atleast one was listed as low as 1500. Certainly
its worth checking.

I ran across another reference which indicates 43** models in 10" are
rated for 2450 with steel body and 1500 for cast iron body.

I have a 8" Bison, ind. 4-jaw, that's stamped "4344-8/5". The bison
catalog seems to say that all the number 4344 chucks have cast iron
bodies. 4344 chucks are listed on Pg 74, and rpm data on pg 144.

(sorry link is wrapped)

http://www.bison-america.com/public/...d/00082/81296/
bison-2016-usa-chapter-1-manual-chucks.pdf

Bill

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Email address is a Spam trap.

On Thu, 11 Jan 2018 11:38:55 -0700, Bob La Londe
wrote:

I recently got a good deal on a new old stock Bison 10" independent 4
jaw. Its the model with the FPJ logo instead of the actual Bison logo.
In my search to make sure I had actually gotten a chuck made by Bison I
ran across references to how fast you can spin a chuck. I'd never
really thought about it before.


The lathe I plan to use it on turns upto 2000 RPM. I have for short
periods spun the 10" import chucks that came with the machine at that
speed. Other than taking a little while to come up to speed I never
noticed any adverse issues. However! I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck? Is there a
reference where I can look it up? What about the cheaper 10" import 3
jaw that came with the lathe or for that matter the cheaper 10" 4 jaw
that came with it?

Im not an "expert" on chucks..but I do deal with them in my work. A
10" chuck...well..it largely depends on the size of the work IN the
chuck. Most 10" parts..depending on speeds and feeds..wont ever be
run much faster than 1000 rpm. Aluminum of course...shrug..spin it as
fast as you want. That being said..the jaws are now trying to fly off
the chuck at speed..the bigger the chuck, the bigger the jaws..the
more energy that they are carrying...trying desperately to leave the
chuck due to centripital forces.

If a jaw ever gets a crack in it...it will ultimately turn into a
rather nasty fragmentation device..having a pound of cast iron leaving
that chuck at speed...can be lethal..and can screw up your entire shop
even if it doesnt hit the operator.

Personally...I think you are "ok" at 2k rpm with a good quality chuck
in good condition. Its fast..but its not Real Fast.

Most CNC lathes will turn a 10" chuck up to about3000 rpm..but the
question is...SHOULD you spin a chuck that fast? It takes time to get
up to speed unless you are running a 25hp motor ....and it takes
significant time to slow down to a stop.

Most manual lathes that I work with..up to about 20"...max out their
speed range at about 1500 rpm. This is not just due to chuck size..but
all the spinning bits inside the head are also spinning pretty fast as
well...lots of energy trying to tear that chuck apart.....

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On Thu, 11 Jan 2018 15:24:14 -0800, Gunner Asch
wrote:

On Thu, 11 Jan 2018 11:38:55 -0700, Bob La Londe
wrote:

I recently got a good deal on a new old stock Bison 10" independent 4
jaw. Its the model with the FPJ logo instead of the actual Bison logo.
In my search to make sure I had actually gotten a chuck made by Bison I
ran across references to how fast you can spin a chuck. I'd never
really thought about it before.


The lathe I plan to use it on turns upto 2000 RPM. I have for short
periods spun the 10" import chucks that came with the machine at that
speed. Other than taking a little while to come up to speed I never
noticed any adverse issues. However! I'm certainly no expert on this
sort of thing.


How fast can I safely spin this big heavy Bison chuck? Is there a
reference where I can look it up? What about the cheaper 10" import 3
jaw that came with the lathe or for that matter the cheaper 10" 4 jaw
that came with it?

Im not an "expert" on chucks..but I do deal with them in my work. A
10" chuck...well..it largely depends on the size of the work IN the
chuck. Most 10" parts..depending on speeds and feeds..wont ever be
run much faster than 1000 rpm. Aluminum of course...shrug..spin it as
fast as you want. That being said..the jaws are now trying to fly off
the chuck at speed..the bigger the chuck, the bigger the jaws..the
more energy that they are carrying...trying desperately to leave the
chuck due to centripital forces.

If a jaw ever gets a crack in it...it will ultimately turn into a
rather nasty fragmentation device..having a pound of cast iron leaving
that chuck at speed...can be lethal..and can screw up your entire shop
even if it doesnt hit the operator.

Personally...I think you are "ok" at 2k rpm with a good quality chuck
in good condition. Its fast..but its not Real Fast.

Most CNC lathes will turn a 10" chuck up to about3000 rpm..but the
question is...SHOULD you spin a chuck that fast? It takes time to get
up to speed unless you are running a 25hp motor ....and it takes
significant time to slow down to a stop.

Most manual lathes that I work with..up to about 20"...max out their
speed range at about 1500 rpm. This is not just due to chuck size..but
all the spinning bits inside the head are also spinning pretty fast as
well...lots of energy trying to tear that chuck apart.....

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Most chucks will lose their grip on the work long before they're in
danger of exploding.

--
Ed Huntress