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:
IIRC the store bought run about $300.
Some use a urethane liner:
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.
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
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.
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.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.