Source for spindle liners?

[Randy]

Where do you guys get spindle liners for your lathes? I would like
to run the occasional 3 foot bar in mine, now that I got it running
and have a post that works fairly well. bore is 2.950"

Anyone make their own?

Thank You,
Randy

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[Garlicdude]

Post by Randy
Where do you guys get spindle liners for your lathes? I would like
to run the occasional 3 foot bar in mine, now that I got it running
and have a post that works fairly well. bore is 2.950"
Anyone make their own?
Thank You,
Randy
Remove 333 from email address to reply.

Randy, I've made some of my own using PVC water pipe and gluing the appropriate
size bushing on.

I've also bought some from these folks:

http://www.jfberns.com/

IIRC the store bought run about $300.

Some use a urethane liner:

http://www.trusty-cook.com/products_spindleliners.htm

Best,
Steve

[larryrozer]

Where do you guys get spindle liners for your lathes?   I would like
to run the occasional 3 foot bar in mine, now that I got it running
and have a post that works fairly well.  bore is 2.950"
Anyone make their own?  
Thank You,
Randy
Remove 333 from email address to reply.

Because you said "occasional":

1) Make a ring out of plastic that attaches to the end of the stock
with a set screw. Machine the OD of the ring so it fits into the
spindle ID. The ring attaches to the OD of the stock with set screw.
The ring moves along the inside of the spindle with the stock as it
gets pulled toward the chuck.

When the ring reaches the end push the ring and bar end out the back
and reload. Down side is load, unload time and longer bar end/s.

2) Depending upon the operations, stock size and material type you may
be able to use (make) a liner that attaches to the end of your tube
and extends 12"-18" inside.

3) Buy PVC, HDPE or other plastic pipe with ID close to your material
OD (general purpose recommend within 1/16-1/32). Make rings out of
plastic or other material. Ring OD matches Spindle/Draw tube ID. Ring
ID matches Plastic OD (slip fit). Place rings evenly along plastic
pipe, set screw attaches rings to plastic pipe. Assembly goes into
spindle/draw tube. You will need a stop (something) at the end so the
assembly can't back out during operation.

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Otherwise:

http://www.jfberns.com/Liners.htm

http://www.emachinetool.com/accessories/catalog/large.cfm?OptionFamilyID=190

[Garlicdude]

Post by larryrozer
3) Buy PVC, HDPE or other plastic pipe with ID close to your material
OD (general purpose recommend within 1/16-1/32). Make rings out of
plastic or other material. Ring OD matches Spindle/Draw tube ID. Ring
ID matches Plastic OD (slip fit). Place rings evenly along plastic
pipe, set screw attaches rings to plastic pipe. Assembly goes into
spindle/draw tube. You will need a stop (something) at the end so the
assembly can't back out during operation.

This is what I do, but I glue the rings on. I also put O ring grooves in the
rings for a push fit in the drawtube. I haven't had a problem with the spindle
liner coming out with just the O rings holding it from backing out.

I also make split plastic bushings or find an O ring that fits the OD of the bar
so that I can bridge different sizes of bar without having to buy every size of
spindle liner.

Best,
Steve

[larryrozer]

Post by larryrozer
3) Buy PVC, HDPE or other plastic pipe with ID close to your material
OD (general purpose recommend within 1/16-1/32). Make rings out of
plastic or other material. Ring OD matches Spindle/Draw tube ID. Ring
ID matches Plastic OD (slip fit). Place rings evenly along plastic
pipe, set screw attaches rings to plastic pipe. Assembly goes into
spindle/draw tube. You will need a stop (something) at the end so the
assembly can't back out during operation.

This is what I do, but I glue the rings on.  I also put O ring grooves in the
rings for a push fit in the drawtube.  I haven't had a problem with the spindle
liner coming out with just the O rings holding it from backing out.
I also make split plastic bushings or find an O ring that fits the OD of the bar
so that I can bridge different sizes of bar without having to buy every size of
spindle liner.
Best,
Steve

Now THAT! is a machining tip, thanks.

I use the set screws because different machines have different size
draw tubes. I like the idea of the O'Ring to keep it from backing out.
I will try that if the opportunity ever comes up again.

[Randy]

On Thu, 18 Feb 2010 17:08:55 -0800 (PST), larryrozer

Post by larryrozer

Post by larryrozer
3) Buy PVC, HDPE or other plastic pipe with ID close to your material
OD (general purpose recommend within 1/16-1/32). Make rings out of
plastic or other material. Ring OD matches Spindle/Draw tube ID. Ring
ID matches Plastic OD (slip fit). Place rings evenly along plastic
pipe, set screw attaches rings to plastic pipe. Assembly goes into
spindle/draw tube. You will need a stop (something) at the end so the
assembly can't back out during operation.

This is what I do, but I glue the rings on.  I also put O ring grooves in the
rings for a push fit in the drawtube.  I haven't had a problem with the spindle
liner coming out with just the O rings holding it from backing out.
I also make split plastic bushings or find an O ring that fits the OD of the bar
so that I can bridge different sizes of bar without having to buy every size of
spindle liner.
Best,
Steve

Now THAT! is a machining tip, thanks.
I use the set screws because different machines have different size
draw tubes. I like the idea of the O'Ring to keep it from backing out.
I will try that if the opportunity ever comes up again.

Thanks to all.

Thank You,
Randy

Remove 333 from email address to reply.

[D Murphy]

Post by Randy
Where do you guys get spindle liners for your lathes? I would like
to run the occasional 3 foot bar in mine, now that I got it running
and have a post that works fairly well. bore is 2.950"
Anyone make their own?

I like simple. So the easiest way to make a spindle liner in a hurry is
to machine a series of short bushings and load them into the back of the
spindle. I prefer to make them out of brass or aluminum, not only
because it's easy to machine, but also because those materials won't
rust and get stuck in the spindle. Beware of using plastics, some can
swell up and you'll never get them out.

Anyway, make the last bushing with a flange on it if your spindle has a
cap to retain the liners. If the liner is retained by a set screw, mill
a flat or cut a groove in the last one to prevent it from getting
buggered up and stuck.

Don't worry about filling the whole length of the spindle tight with the
bushings. Some gap in between them won't hurt. Put generous chamfers on
the ID and OD of each bushing.

If you decide to buy them, every bar feed comapny buys them from JF
Berns - http://www.jfberns.com/ So cut out the middleman and save money.

Also Trusty Cook makes polyurethane liners and offers shaped ID's for
hexagon bars, etc. -

http://www.trusty-cook.com/products_spindleliners.htm

[m***@gmail.com]

Hi

I had problem with Nylon Bushing used as spindle liner with Draw Tube in CNC Turning centre.

I also used O rings on the OD of this Nylon Bushing before inserting it into the Draw Tube.

Now I want to replace them with other Nylon Bushing but they got stuck in the draw tube and doesn't comes out.

Please provide me the solution, how to remove this stucked nylon bushings from the draw tube.

Regards,

Piyush

[Alphonso]

Post by m***@gmail.com
Hi
I had problem with Nylon Bushing used as spindle liner with Draw Tube in
CNC Turning centre.
I also used O rings on the OD of this Nylon Bushing before inserting it into the Draw Tube.
Now I want to replace them with other Nylon Bushing but they got stuck
in the draw tube and doesn't comes out.
Please provide me the solution, how to remove this stucked nylon
bushings from the draw tube.
Regards,
Piyush

Brute force. Largest diameter tube you can get into spindle from chuck end
and whack it with a hammer.