Using the Excellent Wrenn W7308 5 Pole Armature. Will improve the running of a Big City Locomotive?
ฝัง
- เผยแพร่เมื่อ 10 ก.ค. 2024
- #modelrailways #restoration #vintage
After a bit of consideration I decide to fit the Wrenn W7308 5 Pole Armature to last weeks City Of Stoke On Trent, Wrenn Model Number W2227. Will we notice any changes in performance? Keep watching to find out. Thanks for looking
![แขกคนแรกร้านแจ๊ส [ซี - เอมมี่] | iJazzKhunJang](http://i.ytimg.com/vi/XP6C9kulFfc/mqdefault.jpg)
Thanks for sharing this video, another successful project keeping these old items on the rails, J
I'll keep trying, it's great working on these older items. All the best to you
That's a nice improvement to the running. Anything that makes them more pleasing to drive is a good thing. 😊
Indeed, it's satisfying to get more fun from the driving aspect of running. Thanks for looking, all the best to you
It's great to see the oldies still doing what they were designed to do.
My personal preference is for either the crimson or blue liveries on these locos. It's odd how some classes look better in a certain colour. Having said that, I'm sure there are people who think these locos look their best in black!
I like all the variations but probably my favourite is blue or this black. Thanks for looking, all the best to you
I can certainly see the improvement but I wonder if it might have been better to have used it in the loco that looks good with its lining etc. al in place. I suppose it doesn't really matter as you are able to switch them around at will. Excellent demonstration again Jonathan. Thank you.
I probably will reinstate the original armature, I want to try this 5 pole one in something else. Thanks for looking David, all the best to you
Sorry that I haven't been around for quite a while Mr. S, but it's good to see the layout again and hear your commentary. The 5 pole armature is better I think. The loco doesn't appear to be slowing down as much on the curve as it did with the 3 pole armature. A definite improvement. Sam of Sam'sTrains on TH-cam would definitely approve! Best, Pete.
Thanks for watching again Pete, I'm glad you think it ran better after the work. Take care, all the best to you
That was a vast improvement for slow running and pull off speed, great to see.
Yes, great for scale running. Thanks for watching, all the best to you
Nice work.
Simple exchange and a nice runner afterwards.
Stay Safe.
Mon
Thanks Mon, it didn't take long and was successful. Thanks for looking, all the best to you
Great results and a smooth runner 🙂
Thanks, it does run well now. Best regards to you
Brilliant upgrade I had no idea that they did five pole, my poorly 4MT would certainly benefit.
They are a great upgrade, it's just finding them that's the problem. Take care, all the best to you
@@MrSnooze thanks, yes I've noticed they are almost impossible to come by
Very interesting
Glad you liked it, thanks for looking, all the best to you
I think see run very well before and even better after the five pole motor was fitted
I have all my dads old Wrenn locos and triang/Hornby locos a ton load of rolling stock they do look a bit out of place with all my newer locos but for there age they look and run great
I can't see today's super detailed locos ageing as well and running perfectly in 50 or so years
Thanks for looking, it's good you still have the older items. If I'm around, I'll take a look at some of todays stuff in 50 years. It might be interesting. Best regards to you
Thats a remarkable improvement. I have Wrenn City of Stoke on Trent” and while it runs quite well it always seems to struggle at slow speed with heavy loads as if its too highly geared. So maybe I will keep my open for one of those 5 pole armatures-not that they seem to be very common.
Good luck getting one of these, they seem very elusive. Take care, all the best to you
I can speak only from my own experience, but:
1/ All motors are at a disadvantage with slow speed and heavy loads. Wrenn/HD are better than most because of the mechanical advantage of the large rotor diameter. For a treatise on what happens inside loaded motors see TH-cam Dave Ramirez: Warbonnet trains th-cam.com/video/E5W0xy2SMyM/w-d-xo.html The interesting bit is the discussion after the loco servicing.
2/ Again from my experience running this stuff: the magnets weaken. I remag mine every 5 years or so. This is probably the source of your problem.
3/ Check for friction problems. Ensure the steel balls are still in the bearings and that that the tightness of the lock nut on the bearings is not embarrassing the armature rotation. I keep mine at about 5 thou up and down movement on the rotor.
Loosen the grub screw on the worm wheel so as to be able to cycle the running gear. Any problems will be apparent. If the drivers are out of quarter it is probably because someone has tried to hand turn the wheels - it appears to be a common idiocy with Wrenn owners! In Snooze's natural state of snooze he probably has night-mares about fixing clocks brought in by folk like that.
4/ Yes: I have often wondered about the gearing on HD/Wrenn. Like you, suspicion is that the ratio is too low (what you call high geared/ I call low geared because fast speed means low ratio). I replaced a worm wheel on an 8F with one from a Castle. This raised the ratio as the Castle has more pitch diameter (teeth). It didn't help. In any case it is doubtful the brilliant design team would have a less than optimal ratio. Speaking of which, installing 5 slot armatures or my swapping around gears is interfering with factory settings, and that is a worry. One day I shall un-modify my 8F.
5/ Even on my damp atmosphere affected track I get good operational standard running by starting and stopping with a pulse throttle. Snooze has the details. As best I can find out, the theortecial pulse induced heat build-up on these open frame dinosaurs is negligeable, as probably is the demagnetising effect. And think: the common unsmoothed rheostatic controllers is already pulse. I start and stop, and climb out on pulse, turning the pulse down and then OFF for main sequence running. I let my stock circuit run for a few minutes to warm the mechanisms and the oil. My best runners are Castles, my worst are 8Fs; but all are OK. My most commonly used loco is the 4MT which performs just OK, but still OK. My worst runner is the Wainright R1; it stalls but I have not had time to really explore why. Someone at your club will have a pulse controller to try.
In my experience Wrenn locos shine , and are serviceable. Snooze's servicing of the 8F is worth a look.
In any comment I make, I stress: ALWAYS monitor for HEAT !!! If you are going to convert to DCC, ensure both brushes (isolated from the frame during conversion) are in metal bushes - never ask a brush spring to carry a traction current (see Dave Ramirez). Get any changes you make checked by an electrical person. Perhaps if anyone out there is a tertiary qualified electrical engineer he or she might be kind enough to say what they think.
Why print all this? Because for Wrenn, with proper servicing and good controllers 5 slot rotors are not needed. Or at least not in my decades of running. Stay with factory specs if you can.
ALWAYS MONITOR HEAT ! ALWAYS; ALWAYS; ALWAYS !!!!!
Thanks Snooze.
Splendid upgrade to a beautiful loco, Mr S..... great work, as per usual...
🙂🙏🇳🇿
Thanks, I'm pleased how it went. All the best to you
A considerable improvement in running.
Yes I agree, I wish I had more of these armatures. Take care, all the best to you
Very interesting. 3 pole segment to segment 8.7R thus about 13R coils; 5 pole s to s 6.0R thus about 7.5R coils. I wonder why the coil resistances are so different? Hopefully someone might know more than me and advise! Intuitively, one would expect the 5 pole to be more efficient and thus draw less current but the resistances and the ammeter show the opposite. Great video!
it's peculiar, this 5 pole draws more current than the standard 3 pole. The Airfix 1001 5 pole draws more than a 3 pole XO-4 too. Something to think about. Take care, all the best to you
Great fun with the conversion, lovely pull away
Yes, and it's getting smoother too. Take care, all the best to you
It seemed a lovely runner before.
But to see such a visual differance even through our screens was quite astonishing.
Once the brushes have bedded into the new commutator, it should get even better.
Id be interested to know what differance it pulled on your ampmeter after conversion.
Regards.
There is a shot of the ammeter right near the end of the running. Slightly more consumption than the original. Take care, all the best to you
Would it be possible to give a Hornby dublo 2 or 3 rail locomotive that use vertical motors a 5 pole armature?
I bet it would, it's just finding the five pole armature, they go for silly money. All the best to you