Broken Shaker Grate Nub Clayton Hotblast

 
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Lightning
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Post by Lightning » Sat. Mar. 21, 2015 12:38 pm

I have a really good answer for that Steve. The square nub on the grate intersects the shaker handle, it ALSO intersects the grate that is in line behind it.

In order for them to produce it the way I have the grates now, there would need to be 2 different grates. One with the nub, and one without. Otherwise, the nub would either wear a hole in the back of the firebox or the grate set wouldn't fit at all. That extra nub in the back would be in the way.

As they are from the factory, the two inline grates are identical. That way, they only need to produce one grate that will fit the front and back.

 
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Post by KingCoal » Sat. Mar. 21, 2015 1:32 pm

these grates are inline, not side by side ? if so I see what you are saying.

could this be made to work with the grates as manufactured by having the front one in position with the steel extension installed toward the ash door, that same grates cast nub inserted in the cast square socket of the rear grate and the extra length of IT'S square cast nub cut back to avoid contact with the back wall ?

clear as mud ?

 
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Post by Lightning » Sat. Mar. 21, 2015 2:10 pm

Crystal clear :lol: yep trimming the nub off the back grate would make it work. Also yes, these grates are in line with each other, not parallel.

 
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Post by KingCoal » Sat. Mar. 21, 2015 2:32 pm

you brought up the fact that these grates are prone to this failure.

is the break always of the "front" cast nub at the shaker ( ash door ) end ? or does the nub and socket between the front and rear grates fail too ?


 
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Post by Lightning » Sat. Mar. 21, 2015 2:46 pm

KingCoal wrote:you brought up the fact that these grates are prone to this failure.

is the break always of the "front" cast nub at the shaker ( ash door ) end ? or does the nub and socket between the front and rear grates fail too ?
Yes, for me it has always been the nub on the front grate that the shaker handle attaches to.. This nub has to bear the resistance of both grates. So it has twice as much "heavy lifting" to do as compared to the back grate nub.

Red arrows point to the grate sockets. Green arrow points to the grate nub, the front nub is out of view, it protrudes at the as pan door. This is the original arrangement before I rotated the grate set 180 degrees.

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Post by KingCoal » Sat. Mar. 21, 2015 3:05 pm

hmmmmm, yeah in the factory arrangement the front most extended nub has no vert. or lateral support beyond the grate "tray".

it would take great effort to keep from adding stress to it while shaking. even if you maintained all force down you are in fact exerting leverage back at the nub support in the tray.

 
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Post by Lightning » Sat. Mar. 21, 2015 3:49 pm

KingCoal wrote:it would take great effort to keep from adding stress to it while shaking. even if you maintained all force down you are in fact exerting leverage back at the nub support in the tray.
Right on, I managed to help balance the lateral and vertical stress by modifying the shaker handle to be "two fisted" (I made it "T" shaped) so that the only force applied to the shaker nub was the twisting force. It was a step forward for the longevity of the nub, the last one lasted nearly 3 full heating seasons. But it wasn't the "answer" for the design flaw. I think I found the answer by rotating the grate set.. :) as long as the center continues to hold well. Like stated earlier, the center nub only needs to deal with the resistance of one grate instead of two..

 
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Post by Lightning » Fri. Jan. 08, 2016 10:00 am

Bringing this thread back to the top for a fellow hot blast furnace user. I also would like to add that this fix is still functioning great.


 
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Post by Lightning » Mon. Jan. 01, 2018 5:10 pm

It was around March 10th, 2015 when I turned the grate set around as described in this thread. Since then it's been almost three full heating seasons a total success, till last night. The rear shaker grate nub that joins the two grates in the middle finally gave up. It broke and left me with only a functioning front grate. Hell of thing to happen on New Year's Eve. Fortunately I had nearly finished the ash clearing routine so I loaded coal for the night burn.

My buddy that I've helped with his Clayton 1602 also has a Hotblast 1537 in his garage that he only burns wood in. I sent him a message this morning seeing if he would sell me his grates since he don't ever plan on using coal in that unit. He wasn't home but told me to go over and pull the grates. A friend indeed lol.

So the furnace was down for about 4 hours today. Total clean out and reinstall of a replacement grate. House temp fell to 64 by the time I got heat production again.

Man I'm glad that's over lol :lol:

 
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Post by Sunny Boy » Mon. Jan. 01, 2018 6:50 pm

a grate-friend is a great friend to be grateful for ! :D

Paul

 
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Post by freetown fred » Mon. Jan. 01, 2018 6:57 pm

Nice save Lee. Yep, friends are grate!! :)

 
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Post by hotblast1357 » Mon. Jan. 01, 2018 9:47 pm

Time to get ahold of a foundry and cast a one piece grate, or try to adapt those Clayton roller grates.

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