Atlas Mfc - Motor Pulley Size? Spindle Belt Size?

Rich,

Unless you make it out of cast iron, a pulley made from a cast blank (aluminum) will not be nearly as strong as one made from wrought stock.

Jon,

Look more carefully at the section views of the cast iron pulleys from Leeson. The face opposite the hub is not flat on any of the three types. And on the larger PD ones, neither face is flat. So that wouldn't work very well.
 
I called Clausing this morning. They do stock the 9-428 pulley. It is $96.68 plus shipping. That's a bit too much for me.

Robert D., Thanks for the heads up on the Leeson pulleys. I see the problem.
 
I asked Clausing about the spindle belt when I was restoring my MFC. They told me the belt is a Gates 3280.
 
Jon,

Did they quote a price on the 10-428 (very few 1/2" dia. shaft 1/2 HP or larger motors made today)?
 
She said that when she looked up the 9-428 she was referred to the 10-428. She said a reducing bushing was included. I did not ask the price of the 10-428. Maybe it excludes the reducer and is less expensive.

I might be wise to get a pulley that uses a 5/8 inch shaft with a reducer. If my 60 year old Atlas motor gives out I can use the pulley with a modern 5/8" shaft motor.
 
When she said that a reducing bushing was included, she was referring to the 10-428. And if she looked up 9-428 and was referred to 10-428, then the price that she quoted you was for the 10-428 with bushing.
 
I went ahead and purchased two single groove Leeson pulleys. The small one is an AK20 and the large one an AK46. They are virtually identical in OD and PD to the original Atlas -428 part. For now, I plan to just swap out pulleys when I want to change speeds. This takes only two or three minutes, so it is not a big deal. I have to say that the Leeson cast iron pulleys are very nice looking - they appear to be more rugged and more precise than the original die cast Zamac (?) part.

.IMG_0197.JPG
 
No, or I don't think so. Early in the thread, Jon posted a link to Leeson pulleys (which included cross-section drawings), and at least one of the two didn't look suitable for stacking.
 
I was thinking like this.

sidebyside.jpg
 
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