What's the name for this pulley?

I'm looking for pulleys to reduce the speed of driven shaft. Basically a large and small pulley together on bearings, like a cone pulley on a drill press. I've searched for sheaves, idler pulleys, cone pulleys, intermediate pulleys, speed reductions pulleys, all come up short. Is there a name for this type of pulley that I'm missing?

McMaster has them - McMaster-Carr

Deleted post.

step pulley on a jackshaft? Or is this some weird design with only one pulley somehow driving another coaxial one at a different rpm? Maybe a sun and planet gearbox design
variable speed pulley is adjustable diameter.
Bil lD

Forestgnome said:

Is there a name for this type of pulley that I'm missing?

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Stepped pulley

stepped pulley - Google Search

Or, perhaps, Reeves drive?

planetary reducer??

doesnt fit the description....but might the application??

shot in the dark.

Forestgnome said:

I'm looking for pulleys to reduce the speed of driven shaft. Basically a large and small pulley together on bearings, like a cone pulley on a drill press. I've searched for sheaves, idler pulleys, cone pulleys, intermediate pulleys, speed reductions pulleys, all come up short. Is there a name for this type of pulley that I'm missing?

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Can't understand "coming up short". Either of "cone pulley" or "step pulley" should have turned-up Chicago Die Casting and Congress as the legacy suppliers in Zamak // light metal, Morse, Browning, T.B. Woods, and Maska in the better choice, EG: Cast iron.

Survivors of the legacy suppliers are Gates or Emerson or ABB or similar conglomerates, properties, present-day. The companies and brand names get bought, sold, horsetraded now and then.

AFAIK, Chinese factories now supply a lot of the light-metal ones, (best to buy NEW, not used.) India the Cast Iron ones (used, better-yet "NOS" are OK in older major-maker goods)... whatever name is now on them.

Sleeving DOWN on shaft size works - stock bushings abound. Boring out for larger shafting may NOT work, especially on the die-cast light-metal ones. Not a lot of "meat" in those.

If you find yerself having to fab?

Suggest moving-over to PolyVee or MicroVee.

MUCH easier to fab pulleys for either of those as the grooves are shallower than legacy Vee and not ALWAYS even needed. Tubing for a "tire" mounted on a hub is easy. Don't need a great chunk of solid metal.

Also way less hassle than synchronous belts. Precision gear wheels, their "pulleys" actually be.

thermite said:

Suggest moving-over to PolyVee or MicroVee.

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Poly V is nice but requires more tension on the belt. If your application can handle that it's good but if not, tends to bend stuff.

Never used micro but I'm guessing might be similar ?

Step pulleys! Thank you all.

Continuous variable speed drive.

Bob
WB8NQW