Crawford BB Magazine Experiment

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scalabro
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Post by scalabro » Fri. Jan. 16, 2015 1:05 pm

Title says it all :)

I have procured a range top lid that is very close in size to the OE stove lid installed on my C40.

With some fabrication I'm going to attempt to make a mag for this stove out of cast iron pipe.

The #8 range lid only needs to have less than 1/8 inch ground off of its circumference to drop into the top of the Crawford.

Then a large "hole" will be cut/ground in the center to fit a piece of iron pipe and welded in.

The piece that is removed from the Glenwood lid will be used as the "Cap" to cover the top of the magazine.

It will end up only being 10-14 inches long, so it's no going to be huge, but will add some additional run time.

I've never seen this done and have asked several very knowledgeable folks, including a few professionals. No one has seen this offered by the factory.

I guess I'll be the first, pass or fail!

All opinions welcome as this is simply an experiment that may or may not work out.

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Post by ONEDOLLAR » Fri. Jan. 16, 2015 1:16 pm

AWESOME! I hope it all works out! Got my #2 humming away for the brutal cold tonight. She has been sitting on "idle" the past 24 hours or so. Did the #2's have a mag option? Just curious.

 
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Post by franco b » Fri. Jan. 16, 2015 1:22 pm

To avoid bridging in the magazine it has to be big enough. Nut or stove coal may be too big.

 
scalabro
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Post by scalabro » Fri. Jan. 16, 2015 1:23 pm

Mark....As far as I can tell, no magazines were offered with this style of stove.

Some have told me it will not work and I have forgotten the reason why.

I am a stubborn Goomba of Sicilian and Calabrian heritage, so, I have to try and see for myself!!!!!!!

 
scalabro
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Post by scalabro » Fri. Jan. 16, 2015 1:24 pm

franco b wrote:To avoid bridging in the magazine it has to be big enough. Nut or stove coal may be too big.
Good point franco.....we will see.

I could have the inside turned, to smooth out the walls to maybe negate that effect somewhat.

For overnight burns I assume I could add the smaller junk at the bottom of my bags :)
Last edited by scalabro on Fri. Jan. 16, 2015 1:26 pm, edited 2 times in total.

 
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Post by Sunny Boy » Fri. Jan. 16, 2015 1:25 pm

Scott,

Tell the nay-Sayers "ugatz".

The only things I'd worry about is, proper choice of welding rod for the metals involved. And, any possible dissimilar thermal expansion rates of the lid and whatever the pipe is made out of might case heat stress cracking.

Obviously, if you can find a pipe that is closest to the cast iron used in the lid, that would make that much less of a problem.

And, I'd make the pipe a bit too long until you figure out how high above the firepot top edge the bottom edge of the mag should be to have the mag give the ideal pitch to the coal bed. That should be high enough to maximize the coal bed volume while not too high thus allowing any coal to be able to sloop over the top of the firepot.


BTW, Warn me the next time you bid on eBay. I almost went after that Glenwood lid as a spare for my range. That project could have become more costly ! :D

Paul

 
scalabro
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Post by scalabro » Fri. Jan. 16, 2015 1:30 pm

Excellent points Paul.

I was thinking of another Italian phrase I know!

I bought the first lid on eBay when Pancho posted it was available. There is another from the same seller on there now.

I asked the seller the dimensions and figured I'd better grab it.

I have been wanting to do this since you guys sent the original mag out for copies.

For 20 bucks I guess I could not go wrong.


 
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Post by Sunny Boy » Fri. Jan. 16, 2015 1:32 pm

franco b wrote:To avoid bridging in the magazine it has to be big enough. Nut or stove coal may be too big.
For what it's worth, the Glenwood #6 mags are 6 inch ID. And they have three small ledges formed inside where the casting indents (to give exterior clearance for the bolt heads and nuts) at the bolt holes that join the two half castings together.

I haven't heard of any feed back about bridging problems from many that were sold through the recent mag project.

Paul

 
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Post by franco b » Fri. Jan. 16, 2015 1:38 pm

Another problem is the Crawford fire pot is narrower than a no. 6. It tends to be deeper to compensate.

 
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Post by buck24 » Fri. Jan. 16, 2015 1:55 pm

I think that nortcan made a magazine for his Golden Bride not too long ago. He may be able to offer a few good suggestions . I think he may be looking for sales on Rope Gasket this time of year. :lol: He will probably chime in for this topic.

 
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Post by coalnewbie » Fri. Jan. 16, 2015 2:10 pm

The magazine will spread the coal over the fire and so the unlit fuel can't take up too much of the fire surface or it will go out. Perhaps a narrow (er) and deep firepot is not the best configuration for this experiment. I don't think bridging with nut will be an issue.

 
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Post by scalabro » Fri. Jan. 16, 2015 3:05 pm

Fair point Coalnewb.

The pot is just over 12 inches in diameter with the refractory, but the the OD of the pipe should be just over 7.

I could use smaller pipe......

However it MUST be attempted!

Here is a pic of how well the G8 range lid fits...

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Glenwood 8 inch range lid.

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Post by coalnewbie » Fri. Jan. 16, 2015 3:32 pm

However it MUST be attempted!
Of course, but lots of pics need to be taken.

 
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Post by Sunny Boy » Fri. Jan. 16, 2015 4:09 pm

scalabro wrote:Fair point Coalnewb.

The pot is just over 12 inches in diameter with the refractory, but the the OD of the pipe should be just over 7.

I could use smaller pipe......

However it MUST be attempted!

Here is a pic of how well the G8 range lid fits...
Since there's no Crawford mags to compare to, maybe we can learn by using what the competition did ?

The Glenwood #6 base heater cast iron firepots are actually 15-1/2 inch ID. With the original one inch thick firebrick lining that makes them 13-1/2 ID. So compared to the Crawford's 12 inch ID pot, the Glenwood #6 is only 3/4 inch wider around the bottom of a 6 inch mag.

The Same for the Modern Oak 116.

The Glenwood Modern Oak 114 is closest to your Crawford in firepot diameter. I'm not sure if it can take the same diameter mag as the larger Glenwood Oaks and base heaters. Maybe FrancoB can let you know if his 114 has an 8-1/2 inch round cover on top like the larger stoves all do ?

If so , than that raises the likelihood the mag was the same, or close to the same diameter as the larger stoves ?

Possible other proof of what other sizes might work. I think FrancoB also posted this picture of a Glenwood price list awhile back ?

The right hand side of the picture lists Modern Oak sizes and lists under each model that magazines were available for all four model sizes with price. The unlined firepot sizes are; #12 (12 inch), 114 (14 inch), 116 (16 inch), 118 (18 inch).

Even if the smaller sized stoves had a smaller mag, it seems that maybe Glenwood didn't think using a small mag would not work because of bridging problems ????

Paul

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Post by KingCoal » Fri. Jan. 16, 2015 4:21 pm

because of the large window in my stove I can watch the mag / hopper feed the fire.

between tendings, at no time will more than a few pieces of coal fall from the bottom of the hopper onto the fire at a time. the fire needs to compress under the coal in the mag for any to drop down.

it won't add some much coal to put out the fire.

i suppose I could shake down so much coal during an ash shake to compromise the fire.

FWIW the bottom of the mag is only 2 inches higher than the top of the fire pot and the way it works the fire is always mounded up to the bottom of it. it really is a drip system. I have non stop blues.


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