Here is a list of all the postings Peter Bell has made in our forums. Click on a thread name to jump to the thread.
|Thread: Solar Panel Slew bearing, van hub?|
Yes I could not find the forum so assumed it had gone and thanks for the alternative.
Thanks also for the explanation on the hub, looks idea. I had looked at static loads previously and everything was way over what I need. Think its going to be around 140-180kg total and it will be based around the cenre so is balanced.
tAbout the size I was thinking of but that hub looks like it slides onto a splined drive shaft so the bearings are in a separate housing, if I'm looking at it correctly!
Did a bit more searching and slew bearings everywhere like elevating platform etc, often combined with a motor to rotate them, probably similar on fairground rides but I'll bet some of the ancient stuff used a lorry front hub.
Yes the tube idea is a possibility--thanks.
Tried Navitron previously on other things so maybe worth a go--thanks.
Rotation of PV arrays is not popular because of the obvious complications and its normally reccommended to install extra panels to compensate but dont want to do this!
I'd looked at bearing like used on a washing machine etc but all are too small/flimsy. On the other hand there are "proper" slew bearings as used on 360 degree excavators etc but very pricy /large to experiment with.
Its a single axis tracker I was interested, single pole mount is quite popular around the world and even in the UK.
This is a similar size to what I am doing. The support is very much like a roof with the panels attached to the correct alloy rails with clips
However it is fixed, I want mine to rotate as the next step, hence the question in case someone has already done it or has practical experience of it.
I may end up with a grid ties inverter etc but it's heating water, matched to an imersion heater. At present its running at 156v and 312w in todays cloudy conditions, full sun is 1100w.
The link below is the controller I am using. It matches the impediance when the sun is not shinning fully. Works very well and the link gives comprensive data as well as a working project.
Thanks for the messages eveyone. They are Photovoltaic panel, 5 of them.Yes they will be out in all weathers and windage is an important consideration which is why I was asking in case anyone had seen or have experience of a commercial installation and could recall the bearings type or how it was made up?
A lot of the info out there does not really go into the detail I am looking for, I have seen plain plastic (for wont of a better word!) bearings advertised which is what I suspect the commercial installations use. I only picked on a rear hub type arrangement as an alternative as they are robust and readily available.
Thanks for the reply. If I used a suitable rear hub complete with bearings etc I was going replicate the original stub but make the length reasonable as it would be inside the pole/tube to avoid over stressing the welds.
Is that what you mean?
Hello, I Have 5 solar panels for water heating which are doing a good job. As part of the experiment I intend making these into a pole mount so that I can rotate and track the sun. I have worked most details out like tracking electronics (arduino), pole and mounting frame.
I wonder if any of our readers has seen a suitable installation and can describe the slew bearing or bearing assembly?
Initial thoughts are to use a front wheel drive van rear hub which has taper rollers, probably, overkill but readily avalailable?
|Thread: Garador door closer|
Thanks for the suggestions but no sensors or batteries (hidden or otherwise) on the actual door also no batteries in the unit, its all mains powered. The fault appears and it stops working witout moving or being touched, only a mains switch off/on gets it going again.
But it's worked this morning!
Thanks for even more helpful comments.
Changed the capacitor, it measured 220uf down from 470uf. Now doesnt get warm but I dont think thats the problem. I can make it display a 5 for overload if I hang onto the door while its moving. but my fault is 4 while its standing doing nothing.
Maybe quite a sophistcated unit with suspected pwm to slow the door as it's nearing the end stops. Think these are set as part of the installation if I remember correct. As its probably some microprocessor problem dont expect its easily fixable so another unit to try maybe a better option. Maybe manual operation is an easier option! This is a 550Nm unit, the ones on ebay are 1000Nm so probably quite old.
Thanks for the offer, shall I send a PM John?
Thanks for the helpful comments.
When it was stopped the unit had clicked off. I've put my clamp on meter on it and switching off fine. Transformer Volltage is 27v but dc to the motor dips as expected on load but a cap on the board is getting very hot. Its only 470uf which seems a very small value for a smoothing cap.
If nothing else reckon I've found a wasps nest!
Yes its all running fine/smooth on the mech side.
Working in the garage earlier with eth door open it put 4 on the display and stopped working after a few minutes without being touched or moving.
I'll have to explore the unit more.
We have a Garador auto M2 garage door closer which has worked faultlesly since it was installed. However it now often will not open, switching the mains off/on resets it and it works but often it puts 4 on the display when it wiil not work.
Needless to say the manufacturer says replace the complete unit at around £300
Has anyone sucessfully repaired one or got any fault finding info of the unit or circuit board?
|Thread: How to post lithium batteries?|
Strange, recently bought 2 x 18650 Li-Ion batteries from batteriesplus.co.uk and they came by Royal Mail at a cost of £1.95, dont remember much about the packing being special.
Perhaps it depends on what you declare, when you read the lists most things are prohibited that I've looked at?
Recently also bought 40l genuine creosote which cost £50 to ship. Needed more so from different company bought 80L They in came in individual cardboard boxes with parcelforce delivery, asked driver about this and he said it was normal, deliver lots of liquids this way.
|Thread: help identifying lathe|
Cannot help with the lathe but Henry Osborn sold tools and general engineering supplies from Percy Street in Newcastle-upon-Tyne when I knew them in the 60's. Very helpful people when I wanted some pulleys. Seem to remember them moving there from elseware but when I knew them looks like they were a shadow of there former selves.
|Thread: Advice on moving an Archdale radial drill|
Its a bit hazy after 17yrs but I think we had wound the table down while in the room locked everything and wound tthe head as far to the column as possible then jacked and packed it to get it onto a pallet finding the balance point as it was some distance to push it through the factory to the loading point. Think we ratchet strapped the head to the table and the head to the column to reduce the chance of it all swinging out while it was in the room.
We lifted it with a strap on the column, that seemed easy as it balanced reasonably well. Ours had originally been driven with line shafting and a motor was fitted low down at the back which helped the balance.
The scrap men were well versed at moving and securing machinery and were patient throughout the epic journey which was around 40 miles, only mishap was taking a chunk out of our gatepost with his lorry as he drove in!
Not much help I know but I also I have an Archdale radial arm drill circa 1921 which I bought from a factory closure sale in Birmingham. Eveyone had a tale of disaster of moving these machines so I would imagine any established machinery mover is well versed.
It was in a store room partially buried. I bought the complete room and and demolished a wall to get it out selling most of the other contents of the room. I recruited 2 scrap men with a useful Hiab lorry to get it home and as we were gently pushing the drill through the factory delicatley balanced a pallet truck we were constantly heckled by people wanting to buy it, lots had looked at it but were more cautious than me about buying it and getting it out of the room.
Mine is really top heavy but we managed to get it home intact and install in in a shed and its proved very useful especially as you can clamp work onto on the side of the table. Great machine, pleasure to use with all the controls to hand---hope it goes well.
|Thread: 30 hour clock electric winder|
I bought original the book in 2002 from a Dutch books seller, cost 30Eur so always been pricey. I see one is available from Austraiia for around £30 delivered on Abe.
I made the winder around that time, see pics (sorry could not figure how to rotate) for my chain driven clock after working out a pully size to suit the chain pitch. Had some problems with the chain getting tangled jambing the motor so added a 20secs timer which unlatches a relay so it switches off after 20 secs, normally takes around 6 secs to wind. Altering the profile of the lead in guides solved that so the chain arrives flat at the drive pulley.
The book gives part no for the motors so used that to spec the motors. I had to to replace te strike motor with a faster one as the strike on a large no, ie 10 could beat the winding speed. I used mercury switches I had in stock from FLT battery chargers.
It's proved a real asset and althought it was a bit of a fiddle getting it right well worth the effort. Hope this helps
|Thread: LG TV ... updated webOS|
Our tv is not very well and I've been thinking of replacing it with an L&G.
Has anything changed with the privacy issue you were concerned enough to post about?
|Thread: Solar panels for water heating|
Thanks for the guidance Joe. Spent some time researching what you have said and I came across this unit. Not fully sure how it operates but looks like a cross between an inverter and a buck converter?
Does this fit with your description of a MPPT Heater element controller, but seems to have charger in the title as well.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.