What's the cause of board slipping on sand paper belt?

[badbert]

check to make sure the movable fence is not wedging. The board could be tapered.

[TurtleCove]

check to make sure the movable fence is not wedging. The board could be tapered.

The fence is not wedging.

When it's slipping, here's what happening....
When facing the keypad, there's a left belt, and a right belt.
Part way thru the carve, the left belt was turning, trying to advance the board, but the board was not advancing. The left belt was moving...but the board wasn't. The right belt was not moving.

Does that mean I have a drive issue? Should both belts be turning?
If so, I should probably remove that cover over the gears, and see if I misaligned something, when I changed the right belt a few weeks ago.

[badbert]

yes they are both driven, they should both turn.

[bergerud]

Take off the x gear cover and find out what is miss aligned or slipping.

[TurtleCove]

The left edge of the right belt had curled under.
For some reason the belt had tracked itself to the left (towards the keypad), hit the edge, and then started to curl under.
I replaced the sand paper belt, and all seems well for now.

[lynnfrwd]

The left edge of the right belt had curled under.
For some reason the belt had tracked itself to the left (towards the keypad), hit the edge, and then started to curl under.
I replaced the sand paper belt, and all seems well for now.

Symptom your head pressure is off.

[fwharris]

The left edge of the right belt had curled under.
For some reason the belt had tracked itself to the left (towards the keypad), hit the edge, and then started to curl under.
I replaced the sand paper belt, and all seems well for now.

Bingo - Also make sure they are not rolled over on the ends.

[bergerud]

That is the first time I have heard of a belt stopping on its rollers from a roll up. Must have been quite a jam. You should check head level and pressure. There must be a reason for such a jam. (I thought for sure a gear was slipping.)

[TurtleCove]

Several of you are mentioning my head pressure is out of wack.
Are you suggesting it's too high, or too low?

And, why would improper head pressure, cause a sand paper belt, to not track straight?

[bergerud]

I am not sure. Years ago when drifting belts and roll ups seemed to be more of a problem, LHR always blamed it on head pressure. I suppose if the head pleasure is large enough, the belts cannot move sideways. The board will not let it.

Your problem must be something else. Maybe the squaring plate is not square and the board forces the belt sideways.