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roobarb

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  1. Thanks both. Yes it is belt driven @Hulk The wheel does respond to the pedal, but speed is not as it should be and it runs slowly, then all of a sudden has a burst of speed, then slows again.
  2. My Shimpo RK55 wheel has been slowing recently and I am seeking advice from someone who knows more about wheel issues than I do, before I take the underside off to investigate further. It was purchased in 2018 so is relatively new, used a couple of times a week for a few hours. The wheel is kept on a cellar which is damp but there is no sign of rusting or corrosion on the wheelhead or underside of the wheelhead. Whilst this is an entry level wheel, the centring capacity is supposed to be upto 11kg/25lbs. I am attempting to throw with weights of no more than 1kg at this time. The wheel turns when I press the footpedal but it is slow, very slow. When I apply pressure to centre clay, the wheel drags or stops completely. When I release pressure, it turns again but slowly. On occasion it will suddenly have a burst of speed, before it slows again. I first noticed the slowing about 6 weeks ago with the slowing to a complete stop happening in the last few days. Motor is 1/8 HP 100W Does this sound like an issue with the belt slipping? Thanks in advance for advice or support. I’m lost without a functioning wheel.
  3. Thanks for the advice on this. I have removed nut and bolt today with a view to replace completely , and I have ordered a replacement porcelain insulator because the current one was damaged at the reverse. The wire was purchased directly from Cromartie and is advertised as high temp (https://www.cromartiehobbycraft.co.uk/Catalogue/Ceramic-Kilns-Electric-Kilns-Pottery-Kilns/Kiln-Spares-Kiln-Elements/Cable/Heat-Resistant-Cable-25mm-Red-HRC-RED-25) but since asking the question on here and spending a bit of time on google, I’ve found that there is high temp wire available elsewhere, wrapped in a fibreglass material, so I will order some of that instead and replace all wires that are damaged or on the cusp. Incidentally, the metal at the top of the kiln where the bolt and insulator sits is in a bad way, with lots of corrosion. I will attempt to clean this up as best I can, as you have both suggested for the element connection. Thanks for your help.
  4. Hello I have been using a Hobbytech 40 kiln for a few years, I think early 90s age but it could be older. The label has burnt off. I run it off a 13amp supply. The kiln isn’t in the best of condition. I am planning on buying a larger, more suitable kiln in the coming weeks but until then, I have to make do and mend. Over the last few months, the wires are burning out and firing is becoming tricky. I have to replace the wires ever 4-5 firings. The usual wire to go if the one at the top element connection. Anybody got any idea what would be causing this? I have removed and repacked the insulation as I could see some heat could be escaping, but the problem continues to happen. As you can see from photo, wires on right hand side to the lid safety switch are also now damaged from heat. Are these straightforward to replace? I was considering having a kiln engineer come to look at this, but the quote for the service alone without parts was over £350 (I only paid £300 for the kiln several years ago, and I’ve got more than £300 worth of work out of it). Any help from a knowledgeable person would be appreciated. Thanks.
  5. Thanks. I suppose it’s worth a try to refire one and see what happens. Like you say, they’re destined for the bin anyway. I wish there was a way to reduce waste when firing goes wrong!
  6. Hello I used a series of 4 glazes layered on a recent set of plates. Every single one of them has crawled, especially on one particular colour which I’m guessing is the thicker application when layered? My question is, can I reglaze and refire them, perhaps to a lower temperature? They’ve been fired to cone 7 (electric), and it’s a Valentine’s Delta stoneware. I’ve refired plates before and they’ve broken right down the centre. I’ve seen people on here say they’ve had success with refiring and wondering if there’s a recommended technique. Attached a couple of photos of the crawling. Hoping someone with more experience than I can provide a helpful suggestion. Other than telling me not to layer the glazes! Funnily enough I’ve used this glazing technique plenty of times on bowls without any problem. Thanks in advance.
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