does anyone know where i can get a set of aluminum pulleys for my shoptask, shoptask does not sell them and I want to increase the speed , shoptask said the pulley are the weak point in upping the speed, :confused: thanks to all, TJ

Just some questions to help understand.

Are you talking mill or lathe head?

What are the current pulley sizes?
What are the shaft sizes?

How much faster do you want to go?
Are you concerned with bearing heat at higher rpm?
(running it for a few minutes is different from many hours)

What size cutters are you planning on using?

Pres

just the mill pulleys, about 6 to 8 k
the main pully has some kind of broched center the the drive shaft rides in,
I am just looking for the pulley the rest I can do myself, Thanks, TJ

personaly anything over 3k on the shoptask will rattle every bolt loose. i got it up to 5k playing arround and took me longer tighting everything back up then it was worth. just my 2 cents

Rainmans229
did you find a aluminum pulley set, if so where please, thanks, TJ

no aluminum pully set known. you do have a lathe. you can make a set.

the main pulley has some kind of metric broached center (I have no ideahow to)

the main head pully has the key way broachs and a bearing. you need keyway cutters( broach) not to sure never done it. never even thought of making my own pullys till now. go with a 3500 rpm motor and remove the intermedian pully. the extra pully is it's biggest issue and the stock motor is 1700 rpm

the main pulley on the mill is tha main issue, I had a junk HF 3 in one before my shoptaks and i use the spear main pulley (cut down) as a shaft lock whan changing mills, it has the same type of center, most of your shaking was most likely caused by the cast pulleys, shoptask said
"The bearings would take 4000 rpm ok, but the cast iron pulley is the limiting factor- you may need to change that to aluminum."

Even if you had a broach to cut the spline I don't think the aluminum would hold up.
If you have a spare pulley with the right spline you could make a hub from it for a new aluminum pulley. The pulley has to be a press fit on the top bearing so the whole job is not an easy task but doable.
Jerry