Here is a list of all the postings Ron Laden has made in our forums. Click on a thread name to jump to the thread.
Thanks guys, Howard I was looking at Glacier type steel/bronze bearings yesterday and wondered if they would be a better option than oilites.
I dont have the space for ballraces so it is plain type bearings I will be using.
Another beginners question:
Will oilite,s be ok for axle bearings on a small electric 5 inch loco..?
Edited By Ron Laden on 16/05/2018 10:38:53
|Thread: 5 inch 0-4-0 Shunter|
That was some loco Jeff, thanks for the pictures. I see from the picture of the motors that they were mounted on the axle as you can see the axle bearings below the motors. This is the way I am mounting my motors, the motor mounting plate has a central bearing which the axle runs through. With the axles having suspension (springs) it was the easiest way I could see to maintain the relationship/position between the motor pinion gears and the drive spur gear which is fixed to the back of the wheels.
I am reasonably confident it should work ok but wouldnt want to count my chickens too soon.
Since I started the design I have changed the gear ratio, due mainly to availability of suitably sized gears at the right price. The ratio is now 6.25 to 1 this should give approx 7 - 8 mph top speed. I have gone with MOD 1.0, I considered finer gears but I thought MOD 1.0 had a little more meat to them without them being too coarse.
There is no clever calculations to any of this its mainly my gut feeling with a bit of "if it looks right it probably is"
I,m getting itchy fingers as I want to get the build started but as I dont have any machining I have to rely on other people for machined parts. I can and will do a lot by hand but at the moment still waiting for chassis parts before I can make a start.
Edited By Ron Laden on 16/05/2018 09:43:04
You cant guarantee the output Roy, they are off the shelf can motors and unless you have a duff motor the two motors output should be within 3 or 4 percent of each other and they will be fine. The motors are driving the same spur gear and will balance out albeit one will be working a little harder. Obviously if you had motors with a difference of 10% or greater then that would become more of an issue.
Edited By Ron Laden on 15/05/2018 19:08:05
Edited By Ron Laden on 15/05/2018 19:10:01
No the axles are independent of each other, each one driven by two motors
Well my motor controller arrived today, got it from Ebay (Chinese) 12 volt rated at 40 amps continuous - 60 amps max for short periods and cost is less then £15.00. Comes with a rotary speed control and a reversing switch.
I connected it up to the four motors and it works (always a bit doubtful with Chinese stuff). As best I can tell at the moment and with no load all four motors appeared to be running about the same. I need to find my digital tacho and then I can check them for sure.
Now, what it will be like under load I have no idea, will it turn faulty or go up in flames I just dont know. I have had the top cover off and it does have some meaty looking components so here,s hoping.
At less than £15 I just had to give it a try, if it fails I will just have to get a better one but the one I have my eye on is over £100 so I,m keeping my fingers crossed.
I,m not expecting sports car performance Perko, just hoping my calculations are correct and if so it should give me 6-7 mph. I am going with sprung axles so that should help a bit with the traction. As best as I can tell at the moment the dry weight should be around 10-11 kgs and the leisure battery I have my eye on is 17 kgs so a total of 27-28kgs.
Also from the calculations I have gone with 6.25 to 1 gearing which again I hope will be ok considering the motors I am using.
Well I guess there is only one way to find out and that is to get it built and give it a test.
The motors 4 x 12 volt 65 watt, axles, wheels and gears have arrived.
I have to modify the axles and gears, fit the pinions to the motors and spur gears to the back of the wheels.
I have no machining facilities apart from a small pedestal drill but a friend is doing the basic chassis side frames and motor mounts, the rest is then down to me.
Looking forward to making a start.
Edited By Ron Laden on 13/05/2018 09:20:18
|Thread: Zeus infallible?----mmmmm!|
Can anyone tell me what is the latest revision.
|Thread: Chassis suspension..?|
Thanks guys, the GL5 standard I looked at gave 4.625 (117.4 mm) as the back to back but mentions a back to back of 4.687 (119 mm) for better clearance of check rails. Our local track is raised so no points but I may one day visit a ground level track with points.
Re-visited the design and decided to go with sprung axles, it means some more parts but I think it will be an improvement. My only problem is that apart from a small pillar drill I dont have a lathe or a mill so I have to buy in/get made all machined parts, I do know a couple of people though so that helps.
p.s. Anyone have any thoughts on the back to back measurements..?
Hi Red, well only scary in that my main passengers will probably be both our great grand daughters (5 yrs & 6 yrs) and our local track is a raised one. Not only raised but some of it is on elevated banks so wouldnt want any accidents.
I,m quite happy with my design and I,m hoping that it should run well but I,m now wondering if I should add suspension to improve it further. I went back to my drawings earlier this evening and it wouldnt be that difficult to add spring mounted sliding axle boxes. As it is at the moment the axles are fixed and running in bearings mounted on the chassis side frames.
Will have to give it more thought and decide which way to go fixed or sprung.
Something else which threw me somewhat is the wheel back to back dimension, from GL5 specs I have drawn it up as 4.5/8" - 117.4 mm. I received 2 axles and 4 wheels today and the axles are giving a back to back of 119.2 mm. I,m now wondering if that is too wide but the supplier said it is all to GL5..?
I must admit I didnt imagine any of this, its all sounding a bit scary...
Good question Hacksaw, that had crossed my mind.
I remember looking over a 0-4-0 at a show last year which had sprung axle boxes/blocks, they housed the axle bearing and had two vertical channels machined from top to bottom, one each side of the blocks. The chassis 1/8" steel side frames had a square U shape machined in them which the blocks slid up and down in with two springs mounted at the bottom of the block.
Would I be correct in thinking that the channels in the block sides would have additional clearance to allow the blocks to tilt in and out - top and bottom allowing the angle of axle to change with the movement of the suspension.
Yet another beginners question.. sorry.
The 5 inch electric 0-4--0 loco I am designing/building I currently have as a fixed chassis (no axle suspension). I can appreciate that sprung axles can give better running but is it essential or is fixed ok...?
The wheel base I have is 11 inch using 3.1/4" wheels.
At some point I will be building a riding trolley and will be needing brakes for that. I never gave aluminium a thought but I can see how it would work and its good to know that your experience shows very little wear. Similar to your pattern I was thinking of a machined ring of material and cutting/shaping them from that. Your casting is a great idea though as you have the full shape of the eight shoes built in and it just needs cutting into individual shoes...very good.
Edited By Ron Laden on 07/05/2018 19:01:48
I have a lot to learn as you can see.. Thanks Bazyle it sounds as if I will be ok with the braking from the controller.
Could you tell me what is a good material for brakes shoes..? I am designing and scratch building a 5 inch electric 0-4-0 shunter type loco. I was thinking of a simple lever system for the brakes with the brake lever in the cab.
Would delrin work ok for the shoes..? Also could I get by with just two shoes working on the rear wheels..?
Edited By Ron Laden on 07/05/2018 08:19:26
Edited By Ron Laden on 07/05/2018 08:20:44
Edited By Ron Laden on 07/05/2018 08:21:38
Edited By Ron Laden on 07/05/2018 08:22:12
|Thread: Interference fit|
Thank you Jason, thats something I didnt know about the oilites and the H8 listing is very useful.
|Thread: Model engineering suppliers|
Macc and EKP are just what I was looking for.
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