why won't my 880 cut straight?

[digga]

a guy i use to work with years ago use to use mole grips to pinch down the rails on the bars that had splayed as you can adjust how much they shut up and less chance of pinching the rails up to much i found when you set the mole grips right it works well

[shillo]

Yes the depth id a good 8mm. This is probably the first time I've given the bar a good dressing.

 

Going to try a good hammering as prescribed by spud! But as he said i can't imagine it being a long term fix.

 

Looks like id better order a sugihara bar. £££

 

I certainly doesn't look like the rails are splayed, but do the inside of the rails wear?

[waz77]

Is the chain 0.63?

[Rob D]

The bar looks like it's done a fair bit of work looking at the paint etc in one of the pics.

 

 

It's interesting ref bars - when and how often should you replace them?

 

 

On the whole they get replaced when they start causing problems like this one is now. It's not necessarily how many hours the bar has done - if the drive sprocket is worn it will burr the drive links which will increase wear on the bar x2 to x3 times.

 

 

Sometimes if the old chain has worn the bar grove out because of peened drive links problems start when you put a new chain in that is then sloppy in the bar.

 

 

You can pinch up the rails but this is only ever a bit of a temporary fix and needs doing fairly regularly.

 

 

At the end of the day I expect the bar needs to be replaced and also a good idea is to change the rim on the drive sprocket and put a new chain on. Cost a few £ but PM me and perhaps I can do a bit of a deal for you

[Peter]

I have had this problem, and fixed it by judicious use of a hammer and screwdriver as described by Spud. I now have a fancy gizmo for truing up the rails when they splay, which is very handy as I tend to run long, old bars right down to the limits.

 

Alec

 

 

Got any more info on the gizmo?

[C.J]

If you look at a new bar,the groove looks the same width as the side rails.

 

On your bar the groove looks to be nearly twice the width of the side rails.

 

Its either wear or the rails splaying .

[moorhead]

This happened to me a while back and it was the sprocket.

[Rob D]

Drive sprockets especially on the big saws seem to wear quickly...

 

 

When they have started to wear beyond a certain point they start to damage the drive links making them burr... this then scrapes the inside of the bar out very quickly.

[spudulike]

Yes the depth id a good 8mm. This is probably the first time I've given the bar a good dressing.

 

Going to try a good hammering as prescribed by spud! But as he said i can't imagine it being a long term fix.

 

Looks like id better order a sugihara bar. £££

 

I certainly doesn't look like the rails are splayed, but do the inside of the rails wear?

 

You often can see no splaying - it is more obvious from the roll of the chain from side to side.

 

In extreme cases, the chain will wear all the cutters on one side only and you can be stood there with the saw going full pelt with absolutely no cutting taking place. Move the bar a tad and it then rips through - a weird effect!

[daveindales]

I had the exactly the same problem. I ended up getting a new bar, and compared the width of the rails to each other. The ones on the old bar were quite a bit wider than on the new bar. Problem fixed.