sugihara bar cracked

[Forest2Furniture]

I was having problems milling some sycamore last week and when I took the chain & bar off I noticed a crack in the bar.

It runs 2 thirds of the way across the width of the bar both sides just under where the jig clamp sits.

 

Anyone else had similar problems

[Goaty]

Really first port if call to ask is rob d. Give him a couple of days to reply. He is a busy man. Who does lots of things.

[Stubby]

Really first port if call to ask is rob d. Give him a couple of days to reply. He is a busy man. Who does lots of things.

 

I was going to suggest the same . He is a very helpful dude .

[shavey]

Yes I second Stubby and goaty quotes contact Rob he is very busy and will get back too you

ASAP

[Forest2Furniture]

It was more as a point of interest not a complaint.

 

We mill therefore things break, it goes with the territory.

 

I just wondered if anyone else had had bars crack on them.

[agg221]

There is a trade-off with Sugihara bars in particular. They are much harder than anything else, which is why the wear so well. However this comes at the price of reduced toughness.

 

It would be interesting to see some close-up photos of the cracks but, without having seen them, my guess is that you will be able to see cracks starting from the edges of the rails and it would be possible to work out which side went first. I am anticipating seeing fatigue crack features and would be looking for the combination of notch initiation and stress raisers.

 

One thing that would be very useful in root cause analysis would be to know where exactly the crack is - powerhead end or nose end, and between the clamps or outside the clamps. My (educated) guess is that it will not be outside the clamp at the nose end. If I had to hazard a guess at location I would be going for outside the clamps at the powerhead end, with initiation on the upper face of the bar as it was fitted in the mill, but I would be interested to know if I'm right.

 

Alec

 

p.s. if you email tech@chainsawbars you get me anyway

[Forest2Furniture]

I'll sort some photos and put them up.

You're right about it being at the powerhead end.

[Rob D]

Yes get some pics up and also some more info for instance:

 

 

• When did you buy the bar?
  
• How long have you used it for and is it mainly milling?
  
• What chain type?
  
• What woods?
  

 

 

And also it would be handy to see how you had it clamped to the Alaskan.

 

 

 

 

[skyhuck]

It was more as a point of interest not a complaint.

 

We mill therefore things break, it goes with the territory.

 

I just wondered if anyone else had had bars crack on them.

 

Great attitude

[arbormonkey]

Great attitude

 

I second that great attitude