tapered centerless grinding

[grinderguy]

What tooling or machine features are used to grind a stainless steel rod,.150 dia by 30 inches long. And now the tough part, the rod needs .002 taper per inch. At the small end the stock removal will be .025 per side.
Robert Setree

http://www.advanced-grinding.com

Robert Setree

http://www.advanced-grinding.com

 

[ornerynorsk]

I wouldn't touch this job with a 10 foot pole!!! The only thing I've ever seen close to what you are proposing was done on a machine with a sub-spindle. The collet was left SLIGHTLY loose in the clamped position (more problems!) and the material was drawn out of the collet as the head moves in at the appropriate rate. Let me tell you honestly, this is a nightmare!!! This was a gov't job for feeder spindles in a 20mm gun feed system, and the spindles were only about 14 inches long. I can't imagine the headache on something 30 inches long with such a shallow taper and small diameter. Good Luck, I'll be watching this post also to see what other people come up with.

 

[RamingtonStall]

Grinder Guy,

The closest thing to this that I have seen is the Thru-feed Centerless Grinding of Fishing Poles. The parts are thrufeed Centerless ground and feed into a Curved tube which bends the poles as they exit the machine generating the taper. Lots of Set-up and playing required to "get it right".

Alternately, if you have a good machine control system, perhaps you can do a combination Infeed-Thrufeed operation which would provide the desired result. Again, sounds like a fun job to set up.

Cheers! ([: ^ )

RamS


SAT SuperAbrasive Techniques, Inc.

http://www.IndustrialDiamondCBN.com

 

[diameters]

Grinding Guy

Regarding the taper grind.

Depending on the tolerance, you need to hold. This is generally not that tough to infeed a taper on a centerless grinder. Is the small end of the taper at .150 or is that the starting size of the material?

Warren Illgen
sales@diameters-inc.com

 

[grinderguy]

The stock size is .150 and is tapered for 30 inches to .100, The basic tol is .002 on diameters.

Robert Setree

http://www.advanced-grinding.com