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hello ttdmt Have you got a copy of Getes' Polychain Drive design manual? If not, you can get one from your local Gates dealer or search the net for Gates. They have a drive design program that you can download. As far as life expectancy is concerned, I have not been able to find any...

When it comes to designing things, I find that time spent flat on my back on a couch with my eyes shut, ruminating on a problem is time very well spent. It is my experience that sorting out the design concepts and requirements first is the only way to go. Then step two, which is making drawings...

Whattype of belt are you planning to use? Once you know what type of belt you are using, you can find lots of information in drive design manuals that are issued by the belt manufacturers

Thanx for your replies. The original shaft was 30 MM diameter and ran a triple row # 50 chain on a 19 tooth sprocket that is just outside the selfaligning double row roller bearing. This sprocket has a pitch diameter of 3.719". The chain drive was replaced with a Gates Polychain 8MM belt...

The problem is not with the bearing. However, Madmango is alluding to another thought that I have for reinforcing the shaft. The bearing is a press fit onto the shaft and that is all that is holding the shaft in position axially. The shaft has a larger diameter center section where the pulley is...

The shaft is made of heat treated 9310, a nickel chrome moly alloy. It should have good fatigue resistance, similar to 4340

I am looking for comments or experiences regarding an idea I have to reinforce an existing drive. The drive consists of a Vbelt pulley mounted on a shaft supported on each side by selfaligning bearings, one a ball bearing and the other a double row roller bearing. Outside of the double row...