Things to look for

- All pulleys must be square to the frame.

- Tension too low.

- Loading point loading in center of belt.

- frozen or seized idler rolls.

- belt rubbing on frame or material build up.

- Return or carrier rolls not set properly in frames.

- material build up on pulleys

- unevenly worn lagging on pulleys

Hope this helps.

Gary Blenkhorn ■

Dear Chetan..

It may be an obvious question..

But assuming you have done the usual (as per Gary's suggestions above), have you actually tried training the belts?

Regards

LSL Tekpro ■

If The Above Suggestions Do Not Work Out For You, Might I Recomend That You Try Installing Guide Rollers.

Attachments

strada guide roller (JPG)

■

Dear Chetan Dabhade,

I've been watching the responses to your enquiry with interest. If you would be kind enough to describe your belt mistraining situation in greater detail, more refined responses would be possible.

Of the responses provided, Gary Blenkhorn's has been the most to the point (and is the main reason why I did not respond). The following is a review and addition to Gary's points.

Review:

- All pulleys must be square to the frame. (If not square to the frame and each other, the pulleys will direct the belt to one side.)

- Tension too low. (If the Tension is too low, the belt can float on the pulleys - especially the drive pulley - and give erratic belt tracking.)

- Loading point loading in center of belt. (If the belt is being loaded to one side, the loading force will move the belt towards the side where the material hits the belts; and the uneven load on the belt will move the belt to the heavily loaded side.)

- frozen or seized idler rolls. (A frozen idler acts as a brake on the belt and will force the belt to the side that the frozen idler is on.)

- belt rubbing on frame or material build up. (If the belt rubs on the frame, the frame acts as a brake on the belt and forces the belt to the side where frame contact is made.)

- Return or carrier rolls not set properly in frames. (If the idlers are not square with the pulleys, the belt will be forced to the side where first contact with the idlers set is made. If you have tilted idler sets put in backwards - id est, the trough idlers make contact with the belt before the center idler, the belt training will be erratic.)

- material build up on pulleys (If there is a build-up of material on pulleys, the belt will be forced to the side where build-up is present.)

- unevenly worn lagging on pulleys (if pulley lagging is uneven, the belt will want to move to the side where most lagging is left in place.)

Additions:

- Tension too high. If the tension is too high, the belt will be more sensitive to slightly misaligned idlers and pulleys. Also, over-tensioned belts are more prone to mistraining due to any carcass tensioning inconsistancies from the manufacturing process. You can check for proper tensioning by measuring the deflection percentage between idlers - it should be close to the belt manufacturer's recommendations.

- Material build-up on idlers. This gives the same problem as build-up on pulleys.

- Belt making contact with side-guide rollers. When this happens, the side-guide roller acts as a brake on the belt and forces the belt further to the side that the roller is on. Note: Side-guide rollers are effective in preventing belt contact with the frame, but are not a good training tool.

- Belt Skirting too tight on one side in the loading zone. Tight skirting will act as a brake on one side of the belt - forcing the belt to one side.

Hope this helps. ■