Jahrmann Posted November 4, 2019 Report Share Posted November 4, 2019 Hi all My whife got two Podmore pottery wheels type P6706, and both have problems with the power when they are loaded, when she wants to throw big items there is no power. Some years ago I fixed this by replacing a resistor and everything was ok, but now I need the electrical scheme/drawing. Anyone knows where to get this? Best regards Dag Quote Link to comment Share on other sites More sharing options...
neilestrick Posted November 4, 2019 Report Share Posted November 4, 2019 Try Potterycrafts UK. It looks like they bought up Podmore a long time ago. Chilly 1 Quote Link to comment Share on other sites More sharing options...
Zac Posted May 12, 2020 Report Share Posted May 12, 2020 There is nothing too elaborate in the electrics, just have to be very careful as it is mains AC and high voltage DC. Also it is worth mentioning that it is a variac (variable AC transformer) that drives the DC motor through an AC to DC bridge rectifier, not a rheostat as some people seem to think. I have a circuit diagram for reference for my own wheel only, others may be different. In the P67.06 I have there are no resistors, just three smoothing capacitors, one on the AC in and one on each of the Field and ARM feeds for the motor. The Normand DC shunt motor is rated 0-200VDC and 1.9A max. There is a mechanical limiter on the foot pedal which limits the output from the variac, probably by design, a wheel that is too fast is no use for throwing and also bad for safety. From what you say it sounds like you have power but just not for "large" loads. I don't know what specified Kg load limit is for this wheel but this wheel is only rated 0.33HP. My wheel happily handles 6Kg. Haven't had a reason to do anything larger. You might need a wheel with a bit more HP. Quote Link to comment Share on other sites More sharing options...
Alan. A Posted July 9, 2020 Report Share Posted July 9, 2020 (edited) Hello I hope you don't mind me jumping in on this topic. I have been asked to have a look at a friend's Podmore P6706 which keeps tripping the trip on the side of the machine. I measured the current at the trip when the wheel is turning and I am getting 6A, the trip is rated at 2A. Motor seems to check out ok but on the field output from the controller when running I am only getting 40V the armature voltage varies between 0-60V depending on the position of the pedal. It's the first time I have come across a DC shunt motor but from what I've read the field winding should have full voltage (230v). Which leads me to think there is a problem with the motor controller. Zak would it be possible to get the circuit diagram you have just in case I'm missing something. Thanks Edited July 9, 2020 by Alan. A Quote Link to comment Share on other sites More sharing options...
Zac Posted July 17, 2020 Report Share Posted July 17, 2020 'Controller' is perhaps too generous. Check the bridge rectifier and the capacitors. When the smoothing cap across the mains blew in my podmore the wheel didn't even turn. Replacement from Farnell cost a few quid including postage. Question is really what's pulling the 6 amps? Hope this helps. Podmore Pottery Wheel circuit diagram.pdf Hulk 1 Quote Link to comment Share on other sites More sharing options...
Alan. A Posted July 20, 2020 Report Share Posted July 20, 2020 Thanks for getting back Zak. I was thinking because the output from the speed control to the field is 40v (should it not be around the 200 mark ? ) that is why the current is higher. Motor and wheel spin ok by hand and motor checks out ok with megger and voltmeter. Like I said I’m not familiar with a dc shunt motor. Quote Link to comment Share on other sites More sharing options...
AdrianF Posted February 11, 2021 Report Share Posted February 11, 2021 I have a P6706, I have intermittent fault where it does not turn when the footpedal is clicked on, repeated switching will work eventually and sometimes just rotating the pedal in the on position will start it up. Is the round box that looks like a circular variable resistor that is rotated by the pedal, the Variac you refer to. If it is where can I get a replacement, I am looking at Farnell and am a bit bemused. My controller has Colvern Ltd 7505H CLR 4801/22 25Kohm marked on it. A Farnell part number would be really helpful and would inform future visitors to this thread. Quote Link to comment Share on other sites More sharing options...
Alan. A Posted February 12, 2021 Report Share Posted February 12, 2021 Hi Adrian Sounds like that's a 25K potentiometer, a variac would be marked with voltage and current ratings not resistance ! If possible remove it and check resistance as it's turned. When potentiometers are worn that would give you the fault your describing. Then go to farnell and get equivalent, same resistance, No. of turns, shaft size etc. I know it's less than a year ago when I looked at my friends but I'm a bit sketchy, I'm sure her pedal was connected to a variac rather than a potentiometer. Maybe a later or earlier model ? Hope this of help Alan Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
Eugene Posted March 15, 2022 Report Share Posted March 15, 2022 Hi I have a P6706 It emits a loud buzz when switch on but the wheel is stationary. No change when the wheel is rotating. Any suggestions appreciated Quote Link to comment Share on other sites More sharing options...
Marina Kleierij Posted July 23, 2022 Report Share Posted July 23, 2022 Hi Zac and Alan, My P670E started to pop the security button after 3 or 4 turns recently. The same problem Alan mentions, Did anyone find a solution? I cannot open the pdf with the circuit diagram. TIA Ineke Quote Link to comment Share on other sites More sharing options...
PeterH Posted July 23, 2022 Report Share Posted July 23, 2022 12 minutes ago, Marina Kleierij said: I cannot open the pdf with the circuit diagram. Opened OK for me, try this URL insteadhttps://community.ceramicartsdaily.org/applications/core/interface/file/attachment.php?id=15303 Quote Link to comment Share on other sites More sharing options...
Marina Kleierij Posted July 23, 2022 Report Share Posted July 23, 2022 Hi Peter, Thanks you very much. I can open the diagram at that url Kind regards, Marina (aka Ineke) Quote Link to comment Share on other sites More sharing options...
bcw Posted October 16, 2022 Report Share Posted October 16, 2022 (edited) Hello, It has been a while since our wheel stopped functioning. It was fixed last week. The schematic diagram mentioned in the previous posts is not quite the same as ours. I have attached our diagram. The issue we had is that the protection switch kicked in after a few turns of the wheel. It turned out that the cause of this was a failed capacitor in the field circuit. This capacitor shorted out, causing a resistor to burn and a fuse to blow. Even without field current there is some remanent magnetic field, and the armature could still turn. However, because the field is weak, the armature current was high. This caused the tripping of the safety breaker. We replaced all capacitors, the burnt resistor and replaced the fuse. The wheel works fine now. Ben speed control pottery wheel forum.pdf Edited October 31, 2022 by bcw A few changes in attachment to improve readability Hulk 1 Quote Link to comment Share on other sites More sharing options...
Miss-T Posted November 22, 2022 Report Share Posted November 22, 2022 Hello, I have a Podmore Alsagar with an item in its control board that is broken. I'd like to replace it. Here's an image of the board: https://www.dropbox.com/s/rng6998pj0up023/image000000.JPG?dl=0 can anyone help me identify the glass item that is broken and guide me to where I can purchase a replacement or equivalent? many thanks Quote Link to comment Share on other sites More sharing options...
Hulk Posted November 23, 2022 Report Share Posted November 23, 2022 Hi Miss-T Looks like Goodwin is still in business; they might be able to help.Contact Us - Goodwin Electronic I don't know what the broken part is. Looks like Potteryworks bought Podmore; they might be able to help:https://www.potterycrafts.co.uk Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 23, 2022 Report Share Posted November 23, 2022 17 hours ago, Miss-T said: can anyone help me identify the glass item that is broken and guide me to where I can purchase a replacement or equivalent? The glass item appears to be a reed switch. You would replace with a reed of the same or higher operating voltage and amperage while it needs to physically be the same size. The reed appears to be single throw, single pole - normally open. Goodwin definitely best choice. Hulk 1 Quote Link to comment Share on other sites More sharing options...
bcw Posted November 24, 2022 Report Share Posted November 24, 2022 Hello, Indeed, both items on the right hand side like like reed relays. The right on is marked as such - RR1. I asked a friend who is more into electronics than I am - he was wondering if this was an original attribute of the board, or a later addition. Also (unlike the relay on the right) it requires a high current to trigger. Do you know something of the history of this wheel? Do keep us posted, please. Ben Quote Link to comment Share on other sites More sharing options...
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