Author Topic: Bow Bars Are Perfect For Firewood!  (Read 4538 times)

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Offline 660magnum

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Re: Bow Bars Are Perfect For Firewood!
« Reply #70 on: March 17, 2015, 05:54:38 am »
I had a Dolmar 111i with a .058 regular bar and It had .050 chain the majority of it's life. I had used it for while before I figured out the miss match.

No one stocks .058 chain around here.
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Offline 3000 FPS

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Re: Bow Bars Are Perfect For Firewood!
« Reply #71 on: March 17, 2015, 10:00:28 am »

I do have a question, is it normal to have two thick spacer plates slide on over the bar studs before the bar goes on.   


So I went on line and found an IPL for a Poulan 245a bow saw attachment.   To answer my own question it does show the two plates as being there.    So that is normal for these saws.
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Online srcarr52

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Re: Bow Bars Are Perfect For Firewood!
« Reply #72 on: March 17, 2015, 02:17:39 pm »
The guards in the picture are made of 16 gauge aluminum and are painted silver for some unknown reason? They come in different gauge thicknesses and are manufactured as an extruded 10' or 20' length of aluminum that is cut off to the proper length.

These guards may be extruded but I could easily bend them up from 9-11 gauge aluminum sheet.

I could also make the spurs from steel or aluminum, bent or machined from billet.

Offline Cut4fun .

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Re: Bow Bars Are Perfect For Firewood!
« Reply #73 on: March 17, 2015, 02:50:46 pm »
Jim any pics of what you got going on up there?
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Offline 660magnum

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Re: Bow Bars Are Perfect For Firewood!
« Reply #74 on: March 17, 2015, 03:46:12 pm »
Here are a couple pictures of my Husqvarna 371 with the bow bar mounted.

I still need to drill and bolt on the upper guard and I need to do a little more clearance on the top of the clutch cover.

When you are running the chain around, the slack is on the top of the mouth of the bar. So as the chain rises up, it is hitting the clutch cover the way things are right now. You can see where the cutter hits in the second picture. Also in the 2nd picture, you can see where the original cut out was in the clutch cover and where I cut it back farther (needs to be a little more). Also you can see the relief in the chain plate and brake mechanism cover if you look closely.

Enlarge the picture to see the detail . . .
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Offline Cut4fun .

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Re: Bow Bars Are Perfect For Firewood!
« Reply #75 on: March 17, 2015, 04:54:31 pm »
Looks nice.
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Offline 660magnum

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Re: Bow Bars Are Perfect For Firewood!
« Reply #76 on: March 17, 2015, 05:16:36 pm »
Some more theory observances in the operation of your bow bar and common sense . . .

In the above picture two posts above, the chain is 40 F and almost tight on the bow bar. But to run the saw, the chain heats up going around the radius. The shorter the radius, the more heat. Observe the burned paint on the rail lips of the bar at the tighter radius points?

After starting the 371XP, in short order, the chain will show slack at the bottom rail at idle. So a compromise of adjustment must be made between the chain being too tight when first started cold and being slack enough to jump the rails after a few cuts?

Though likely more than 30 years old, this bar was unused and had never had a chain on it. It was originally a D176 mount and intended for a 600 series Mac, The bar mounting slot was widened and the oil hole moved to be a D009 mount by some Georgia guy in his back yard shop. As the bar gets a little time on it, maybe the differential chain length between cold and running may be less pronounced?
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Offline 3000 FPS

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Re: Bow Bars Are Perfect For Firewood!
« Reply #77 on: March 17, 2015, 05:34:17 pm »
Good info thanks Jim.   Your clutch cover looks like mag, if you need any welding on it let me know.  It would be no problem.
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Offline 660magnum

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Re: Bow Bars Are Perfect For Firewood!
« Reply #78 on: March 17, 2015, 05:39:50 pm »
Yes the side cover reacts more like Magnesium than Aluminum/Zinc to the file.

Also the chain hitting the top of the cover seemed to not be that detrimental to the sharpness of the cutters.

When I get everything clearanced and adjusted, I'll touch up the chain on the 511A grinder.
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Offline 3000 FPS

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Re: Bow Bars Are Perfect For Firewood!
« Reply #79 on: March 17, 2015, 05:49:57 pm »
I thought it would be really cool to weld a chain gaurd up at an angle and stop with it flush at the front of the clutch cover.
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