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David Woodin

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  1. Like
    David Woodin got a reaction from Magnolia Mud Research in Genesis Controller   
    The Genesis controller has many great features.   My experience with it did not end up good and I returned it and they gave me a full refund.  As Dick White said they give no information as to what  some of there software changes mean to how it will react.  I felt like I was doing there testing in the field for them and that  this should have been done  before it left the factory. I finally gave up when they tried to convince me that the cycling was due to stray coming in on the thermocouple even though I kept telling them the old V6 worked perfectly.  I now have an industrial controller that is 100% better and a setup where I can monitor firing on my computer and  go back and review firings and just measure how long they take to see if there is a change in element s that require  replacing them.  I also changed over to solid state relays, no clicking of relays and a much longer life span on SSR"s with a tighter control.
    David
  2. Like
    David Woodin got a reaction from D.M.Ernst in Longer firing   
    Cone 6 profile for a Bartlett controller range from slow of 15 hours,  medium 7 hrs 37 min , to  almost 11 hours,  fast 4 hrs 36 min.  You may want to measure the resistance of your elements and compare them to Skutts table for elements/
    David
  3. Like
    David Woodin got a reaction from Joseph Fireborn in Genesis Controller   
    It looks like the latest software 3.18.9 fixes the problems with the controller.
    David
  4. Like
    David Woodin got a reaction from kenthenricksen in Pitting and pinholing   
    Do you have a controller?  If so which cone speed profile are you using?
    David
  5. Like
    David Woodin got a reaction from D.M.Ernst in Can I get some opinions and answers on this clay body.   
    Go to www. Lagunaclay.com  they sell sample kits of different clays , this is a great way to decide on the clay that fits your likes.
    David
  6. Like
    David Woodin got a reaction from Joseph Fireborn in Upcoming 300th Firing - Kiln Repairs   
    According to Orton, a" 1/4 inch difference in mounting height of large cones can cause more than a  1/2 cone difference in bending when the same cone is heated."
    David
  7. Like
    David Woodin got a reaction from Joseph Fireborn in Upcoming 300th Firing - Kiln Repairs   
    Since your T/C's were in protecting tubes than all that black stuff must still be in the tubes.  I would remove the protecting tube and shake it out to be certain.
    David
  8. Like
    David Woodin got a reaction from Joseph Fireborn in Upcoming 300th Firing - Kiln Repairs   
    Also make sure the thermocouple hits the end of the protecting tube.
    David
  9. Like
    David Woodin got a reaction from Joseph Fireborn in Upcoming 300th Firing - Kiln Repairs   
    Joe make sure that the height of the cone is set to 2" above the clay pack and is at the proper angle.  An easy way to get the 2 " is that the crossbar of the Orton symbol is exactley 2 " to the tip of the cone and will be at the top of the clay pack.  
    David
  10. Like
    David Woodin got a reaction from Joseph Fireborn in Upcoming 300th Firing - Kiln Repairs   
    I use an Omega 1/4" diameter Type K, in their High Temperature super Omegeclad protecting tube.  Go to www.omega.com, go to temperature than to thermocouple, go to product finder and look at (*) QXL.  The one I use is KQXL-14G-7 @$35.00  The -7 is custom and 7 inches long. Standard lenths are 6 ",12",18" I get way over 150 firings, and when they fail it is immediate because of the small gauge wire in the protecting tube.
    David
  11. Like
    David Woodin got a reaction from eoteceramics in firing schedule needed   
    I think that you can follow Min"s program by using the  first time ramp as a slow ramp from ambient  to what will get you to 200 deg F, (2  hours 10 min from ambient of 75 deg F gets to around 200 deg F) than the second time ramp to get you to a temp you will set in the program, than the next two  time ramps to get you to the bisque temp you will set in the program.   In other words you don't have to use up your 2  setpoints for temperature  right away but can use ramp rates to get to blind setpoints.
    David
  12. Like
    David Woodin got a reaction from D.M.Ernst in Kiln Emergency, Underfiring And Tripping Breaker   
    I would ask your brother to look at the circuit breaker.  The breaker should be rated at least 25% more than the kiln's amperage draw at full power.
    David
  13. Like
    David Woodin got a reaction from Joseph Fireborn in Ian Currie Test Tiles Forums?   
    I use containers 1 quart from home depot for the 4 corners.  The individual cups are used yogurt cups about 6 oz.  The test tile, because I am interested in vertical tests are extruded test tiles long enough to make 5 tests per tile times 7 tiles for the 35 grid.  I only use 300 gram batch  for the corners.  The syringe is 60 cc McKesson Syringe without needle order 102-SC60C20.  Each cup has 48 Milli Litres per sample.
    David
  14. Like
    David Woodin got a reaction from Callie Beller Diesel in In Search Of A Cone 6 Clear...long-Winded.   
    I sent an email with the food safe limits, Hesselberth & Ron Roy.  I am using Matrix glaze program.   There is also another book by Michael Bailey "Glazes Cone 6" which has a section on transparent glazes.  I am assuming you have a glaze program, if not I could put in the recipes in Matrix and email you a formula of the glaze for cone 6 .  This could save you time before firing a lot of unknown glazes.
    David
  15. Like
    David Woodin got a reaction from Pugaboo in Curious Question About Heat Rate Near Cone 6 - Slower Rate - Glaze Improvement?   
    You can use a hold at cone 6 but you have to change the top temperature to keep a cone 6 firing .  For example cone 6 at 108  F ramp equals 2230 F, no hold, but a 30 minute hold means you need to change the top temperature by -40 = 2190 F to get the cone 6 to stay about the same.
    David
  16. Like
    David Woodin got a reaction from Joseph Fireborn in Curious Question About Heat Rate Near Cone 6 - Slower Rate - Glaze Improvement?   
    You can use a hold at cone 6 but you have to change the top temperature to keep a cone 6 firing .  For example cone 6 at 108  F ramp equals 2230 F, no hold, but a 30 minute hold means you need to change the top temperature by -40 = 2190 F to get the cone 6 to stay about the same.
    David
  17. Like
    David Woodin got a reaction from High Bridge Pottery in How Does A Gas Kiln Controller Work?   
    I automated my gas kiln which is a Bailey studio down draft 24 cuft and has two burners.  I used a modulating gas valve on the main gas line feeding both burners.  The valve is set so that it doesn't shut off tightly, so the standing pilot is always on, and so is the burner.  I also limited how far open it will go so a good air gas ratio is always maintained.  The auto part of the firing is only used up to body reduction when the kiln is then put on manual and the rest of the firing is done on manual.
    David
  18. Like
    David Woodin got a reaction from jrgpots in How Does A Gas Kiln Controller Work?   
    I automated my gas kiln which is a Bailey studio down draft 24 cuft and has two burners.  I used a modulating gas valve on the main gas line feeding both burners.  The valve is set so that it doesn't shut off tightly, so the standing pilot is always on, and so is the burner.  I also limited how far open it will go so a good air gas ratio is always maintained.  The auto part of the firing is only used up to body reduction when the kiln is then put on manual and the rest of the firing is done on manual.
    David
  19. Like
    David Woodin reacted to neilestrick in Ian Currie Test Tiles Forums?   
    I am in no way trying to dismiss this method. I apologize if you feel that way. High Bridge noted that he was having different results on his flat tiles vs his vertical tiles, and I made a comment pertaining to that issue. But when you responded that you "haven't seen much difference" between flat and vertical tiles, I felt that will lead people who are not very experienced with glaze testing to think that is the norm, which I feel it is not. And that is my point, nothing more. You asked me to give examples supporting that point, which I did. To then claim those examples do not pertain to the definition of a Currie test does not make them invalid. Glazes do behave very differently depending on whether or not they are fired vertically or flat, and I feel flat tiles are very limiting in how much information they give about a glaze.
     
    I studied Curries method in grad school, and I have used it off on on for the past 20 years, and I think it is very worthwhile. I apologize if you got any other  impression form my comments. But even if I did not think it was worthwhile, or if I had ideas on how it could be improved (which I do), this is a public forum and it is important that anyone be able to add to the conversation, whether it fits your definition of what you think the thread should be or not.
  20. Like
    David Woodin got a reaction from Jend3 in 15 Hours And Not At Cone 6   
    You will be wasting your time, fix the kiln first.
    David
  21. Like
    David Woodin reacted to Mark C. in Reading Cones   
    This was brought up a week ago so I thought I would add some info.
    These cones  I show will apply to whatever temp range you are working with-as the position of cone is key whatever range your in. It will not matter if its cone 06-cone 6 or cone 11-the bend in whatever
    Now first let me say that you should have 3 cones in your pack not the two that I show
    This will tell you more info-I use two only because of my specific needs and experience.
    Also these are for the large cones only-small ones are not made for this visual use.I make my own cone packs from scrap porcelain clay
    Never use wet clay as they can blow up and you need cones to really know whats going on in a kiln and cones are the best refreence you have-no matter how you like your digital controller and trust it.
    Lets say you are firing  to cone 6-that means you will need a cone 5 a cone 6 and a cone 7 in your pack.
    I premake mine weeks before needed so thay are dry.I make 8-10 pads at a time
    Make your packs so the cones do not fall onto each other they need to fall free and away from each other-that way you can read them in the spy hole.If you cannot see them but a small brick behind them which makes it easier -also use the right eye proctection when viewing cones in kilns as you can damage your eyes without the right glass.-You can look this up as this thread is about reading cones not the glass to use.
    Now cones can fall all at once or separately or in between thats just the way it is. Whats important is the cone you are firing to.
    There is some good info here so its worth your time reading
     http://digitalfire.c..._cones_193.html
    As you can see using a clock face is good way to talk about where a cone is-3 oclock is 1/2 way down
    1 oclock is a soft tip etc.
    When I fire I'm usually going to what I refer to as a soft cone 11 that is to say I want that cone to read between 1:30 and 3 oclock (this is in referance to a clock face or if you read the link above you will understand this now and what it means as to temps)
    I choose this time depending on how long my fire is going. Fast fire vs slow fire.There is a time temperature relationship.Many call this heat work-heat work is something you should master and cones can help.
    Glazes will melt more if you fire them longer than if they are fast fired with same cone bend . A 12 hour fire say vs a 7 hour fire. Or at least that is my experience in my gas kilns.
    So if the fire is long I choose a softer less bent cone .I hope this is cear.
     
    So in the groups of cones in second Photo-they are
    Group A is cone 10 end point soft cone 11-that means cone 11 is 1:30 to 3 oclock-this is what I fire to usually
    Group B end point cone 11the tip is equal to the base-this is what I fire to in a fast fire
    Group C whoops its way past cone 11 and got away from me.All cones (10-11) are flat-this is what happens when the phone rings or friends are visiting while glaze firing.
     
    In the first photo it the dilemma what to do with your cones???
    I pile them up and every year toss them out
    Mark




  22. Like
    David Woodin got a reaction from DirtRoads in Thermocouple On Paragon Tnf 27-3 Turned Black?   
    Look at the picture in "Thermocouple spitting metal flakes" post.  If that looks like you thermocouple than you have a type K.  Usually a type S would be in a ceramic protecting tube.
    David
  23. Like
    David Woodin got a reaction from High Bridge Pottery in Ian Currie Test Tiles Forums?   
    I usually make a 20 grid but 35 grid would work fine. A = base glaze + 8% Iron Oxide: B same base glaze + 8% Iron Ox.& 10% rutile;
    C same base glaze no colorant: D 10% Rutile.  This gives a line blend from A to C for iron; A to B iron stays at same value but it cross blends with Rutile :C to D line blend for Rutile: This line blend cross blends with iron B to D.  This is impossible to explain but the top row 1 thru 4 Iron is 8%, but 2 to 4 rutile is #2 = 3.33%R + 8% Fe,# 3= 6.67% Rutile + 8% Fe, # 4= 10% Rutile + 8% Fe.  Anyway it is a good method for testing 2 colorants and depending on your base glaze you may get some rutile blue. take a look at www.matrix2000.co.nz
    David
  24. Like
    David Woodin got a reaction from Cadaola in What Is Wrong With This Recipe?   
    I substituted Gerstley Borate for the colmanite in your glaze and made a 8 tile test and added the GB back  into the glaze in 4 gram amounts, by tile 5=16 gram GB the surface was clear and glossy, tile 6=20 gram no blemish surface, tile 7=24 slight milkyness where thick no blemish, tile 8 some healed over pin holes, 8=28 grams.  Self supporting cone 6@ 90 degree bend, clay laguna Amador stoneware. No faults at all. I don't know what this means in your case, clay? bisque not burning out the carbon material in clay? glaze firing too fast? Ware not dry enough after glazing to be fired?
    David
  25. Like
    David Woodin got a reaction from Cadaola in Glaze Squirt On Kiln Shelves   
    Bisque  cone 06
    48C ramp to 121 C hold 30 min, 149 C ramp to 538C hold 15 min., 65C ramp to 648C hold 10 min.,135 C ramp to 896 C hold 5 min., 26C ramp to 996 C hold 5 min.  The big difference is slower through the carbon burnout period.
    Cone 6 glaze
    93 C ramp to 93 C hold 15 min.,step to 1115 C hold 5 min., ramp 26 C to 1215 C hold 5 min., you can add your cool down if you like.  The only way to be sure you are getting a cone 6 firing is to use witness cones  after that you don't need to use them every time.  I would recommend self supporting cones for witness cones.  I hope things start to improve for you.
    David
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