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Mark (Marko) Madrazo

Member Since 10 Aug 2014
Offline Last Active Apr 21 2017 04:27 PM
*****

Topics I've Started

Not So Obvious Problem

23 March 2017 - 08:44 PM

This is an element plug that had melted. Just one. What ever happened, it wasn't so obvious. I fired a 3/4 full to ^6 kiln. But it never reached ^6. And it run 20 hours on my timer.  So I checked my elements for continuity. I opened the control panel and proceeded to measure past the plugs and they were good. I thought they would be since they were brand new and only fired about 4x before. So I put the control cover back on and did a refire. Once again after 10 hours it was still at ^05, so I shut it down. Waited for it to cool and completely removed the control panel, so I could see if any switches, relays, wire or power relay were burnt. But every thing was fine. Not even a smell. So I decided to see if I had a loose connections. Started tightening screws on the wire and busbar connectors. And sure enough the parts broke off as I began to tighten. It was just holding on because of the fusion. It was in a series of 4 elements. The other 3 elements were fine. As where all the rest. 

 

So how did this one brand new element melt and fuse with the ceramic plug?  Anyone?  :huh:

 

It's working fine now that I put a new element in. But I will continue to monitor. 


Wacky Kiln

09 December 2016 - 09:29 PM

Well, once again my kiln hates me. I have been going crazy trying to get my kiln to fire correctly. I have changed nearly every component of my Duncan DA1029N. New elements, new timers, relays switches, power controller and wires. And the 240v power cable. I checked my power outlet and it's got 240v. The only part I didn't replace yet is the infinite switches. And that's because Paragon said they are not stocking anymore Duncan parts. They are phasing Duncans out.  I have triple check my wiring from the schematic and I done good (my electronics courses in the Army became useful). 

 

Anyway, I have fired 2- ^6 loads. Full load the first time, with witness SSB cones 5,6,7. on the first load the bottom cones went flat. The middle was perfect. The top bent ^5 at about 35 degrees. Cone 6 & 7, no change.

 

So, since half my load was good, I refired the top half. Half load, ^6, witness SSB cones. The bottom ^6 was perfect, The middle ^6 was 90°, but ^5 was perfect. The top shelf was to about the 3/4 level of the kiln. ^6 was 45° and ^5 was touching with a slight bend at the tip. 

 

The last firing was acceptable. Meaning no crazing, craters or pinholes. The glaze was beautiful. 

 

Oh, and I checked amps on the power cord. the amps went to 50 during the last hour. It was a gradual increase. And yes, all my peek holes were closed. I even added kaowool, Marcia gave me around the whole lid circumference. 

 

Should I get a new kiln? Not that I can afford one.


Re-Glaze Tip Of The Day

18 May 2016 - 09:37 AM

Tip of the Day.

A while back, I had fired some cups to ^6. Sadly, I didn't do a, Viscosity, Hydrometer or Specific Gravity test, and the cups didn't have the glaze finish I'd hoped for. So I looked for answers and found a few, but they didn't work for me. So I came up with this idea. One of the suggestions was to heat up the cup and the glaze it, but I couldn't wrap my head around how to do it, sooooo, enter the Microwave. Albeit, it only works for items you can fit in the microwave, but that's probably were the most mishaps happen. Here's how:

1. Prepare table, drying area with newspaper for cups to dry.

2. Tape the foot ring or any part you don't want glaze on with painters tape, blue or green works, I used both.

3. Do a viscosity test.

4. Microwave you piece. I did 4 cups at a time, for one minute. I used a 700 watt microwave. Do a test for how long. You should be able to handle it without burning your skin off.

5. Dip in glaze using dipping tongs. I soaked for a 5 sec. count. and set on paper covered table and let dry overnight or till they can be handle carefully without scraping of any glaze. I didn't have any glaze rub off.

6. carefully pull tape off. I didn't do this, but I could have waxed the band over to avoid the running.

7. Re-fire to ^6.

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Note: I'm sorry I didn't just photograph all the steps. Next time for sure. Hope this helps.

^6 To ^04, Is It Safe?

12 May 2016 - 01:54 PM

I recently fired some ^6 pottery (bowls, cups, mugs, spoon rest) to ^04, so that I could fire my laser decals (used my HP LaserJet P1006) onto the ware. The decals fired nice, but the glaze changed colors. Does doing this increase the chance of chemicals leaching?

 

Is it safe for consumer use?

 

I have used the white cup with coffee, microwaved it and let it cool. There wasn't any crasing.

 

 

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