New Y tension pully is different fron old

[myshop1044]

The new Y tension pully has no teeth, yet the old one did, is the going to cause a problem?
will have to change the Y belt too.

[fwharris]

Have you called LHR to ask?

[lynnfrwd]

I'm told that is the new design. It is to prevent sawdust from building up.

[myshop1044]

Sounds good to me, as long it does not allow slippage.

[myshop1044]

Change out Y tension assb. Very easy, I did Y test and when the truck got to the home Position to start the Y test, it just sat there with the Y belt running for a few sec. then gave me a error E12 0353.
any ideas.

[fwharris]

Was the belt moving?

[myshop1044]

Yes , I installed a new y belt too.

[fwharris]

You might need to put more tension on the belt then. Do yo still have the old one or have an old Z truck? The one on the Z truck is the same.

[bergerud]

Check the belt clamp on the back of the y truck?

[myshop1044]

Yes , Y belt clamp Is tight, I even checked the Y motor and gear box to see if there was play among the gears, nothing.
never seen this one before. The truck move easily along rails in the y direction by hand.

[bergerud]

The belt must be slipping somewhere! When you move the y truck, does the y motor turn? Picture?

[myshop1044]

Found the problem, It was the belt slipping at the truck, I thought the belt was tight, the clip holding the belt was not
clipped down all the way. The screws were tight. When I pulled really hard while holding the truck I felt the belt slip.
I have every thing really tight and did 2 Y move test and worked perfectly.
Thanks again for the input, it made me go back and take a good look.

[Mugsowner]

The new pulley makes a lot of sense. The tensioner is just a take up and an idler pulley and has nothing to do with the drive action except to keep belt tension. As saw dust builds up in the belt teeth it is rotated around the idler wheel, if there are teeth on the idler it can cause a few issues like higher belt tension applying extra stress on the drive motor. No teeth no build up, the drive motor will have the toothed sprocket, which is still able to feel the effects of dust build up but has to be toothed to keep the axis true.

[bergerud]

A consequence may be that the teeth on the belt may get flattened. This is no big deal as those teeth do not make it to the drive sprocket on the y motor during operation. The option, however, to flip the belt when as it wears out may be lost.

A more serious problem may arise if the bushing in the idler wheel freezes up. Instead of causing a y stall and alerting the user to the problem, the belt may just slip on the wheel. This could quickly destroy the belt.

I wonder if the same smooth wheel is to be used on the z belt where dust is more of a problem.

[myshop1044]

A little history , my last belt did come apart and lost a few teeth and separated. I never notice this until this time that the pulley had wore out around the bushing and was wabbleing too. I thought the belt had wore out or was defective.

[Smoken D]

Yes, that little clip holding down the belt is very important that it "clicks" when setting. Other wise as you found out, it don't work. Screw can be as tight as can be, but if that clip is not in the correct position, no go.

[Nick68]

I wonder if the same smooth wheel is to be used on the z belt where dust is more of a problem.

Yes...to the smooth wheel