Some Mods To the Belt Drive On My Mill

#1
I made a pulley that would fit into the top of the cone pulley on the motor to give me a slower speed
160 rpm the lowest with the factory setup was 270 rpm.

Assemble these parts.


You will have this.


Slide it into the cone pulley and tighten the nut.


A shorter belt was required.


There is a wide space in the speeds in the middle between 490 rpm to 950 rpm.
By running a belt directly from the motor to the spindle pulley I was able to get 660 rpm.
 
#6
The cone pulley was bored and had a key-way all the way through.
It just slid in and the expanding shaft holds it tight.
 

DPittman

Ultra Member
#14
I made a pulley that would fit into the top of the cone pulley on the motor to give me a slower speed
160 rpm the lowest with the factory setup was 270 rpm.

Assemble these parts.


You will have this.


Slide it into the cone pulley and tighten the nut.


A shorter belt was required.


There is a wide space in the speeds in the middle between 490 rpm to 950 rpm.
By running a belt directly from the motor to the spindle pulley I was able to get 660 rpm.
I'm curious...what operation did you need the slower speed for, tapping?
 

DPittman

Ultra Member
#17
My similar milling machine only has .350" of room in the cone pulley so not much room for a shaft but I guess the key takes the majority of the forces anyhow and a bit of epoxy or loctite would suffice to hold the pulleys together 20210403_124401.jpg
 

YYCHM

(Craig)
Premium Member
#19
My similar milling machine only has .350" of room in the cone pulley so not much room for a shaft but I guess the key takes the majority of the forces anyhow and a bit of epoxy or loctite would suffice to hold the pulleys together
In that case I would suggest a shaft with key for alignment and torque load and securing the new pully to the adjacent pulley with machine screws.
 
#20
VERY INTERESTING!! I have the exact same mill and have the same complaints with mine as well! I wish it had a few lower speeds and this looks like a great idea! Thanks for posting it.