Lyn >> Schull & Skibbereen Erin(ish)

What is your latest project?
User avatar
philipy
Moderator
Moderator
Posts: 5033
Joined: Sun Jan 30, 2011 3:00 pm
Location: South Northants

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by philipy » Mon Mar 15, 2021 4:30 pm

Very nice job Rik.

I'm going to have to do something similar but starting from scratch, for my Wickham trolley. I just hope I can do as well. :roll:
Philip

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Mon Mar 15, 2021 5:54 pm

Peter Butler wrote: ↑Mon Mar 15, 2021 4:10 pm Now that's what 3D printing is for!
My thinking exactly. It would be difficult to construct such a convoluted shape in any other way, methinks.

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Mon Mar 15, 2021 6:02 pm

philipy wrote: ↑Mon Mar 15, 2021 4:30 pm I'm going to have to do something similar but starting from scratch, for my Wickham trolley. I just hope I can do as well. :roll:
At least I had the original on which to base it. Starting from scratch would have made it twice (if not more) as difficult.
Something I found useful (eventually), was to draw the motor, worms and bearings as a unit and use it to check how well it fitted. With TinkerCAD, I could actually turn it into a "hole' which I then used to carve a motor shaped compartment inside the closed block. It means the real motor is a perfect fit - uncannily so ...... ;)

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Fri Mar 19, 2021 7:39 am

And so the saga continues ...... :(

After reassembling the loco, I gave her a test run. Still very disappointing in terms of pulling power. Even with a standard load of eight goods wagons the loco really struggled up my 1:40 gradients which my other locos gallop up. It also slowed appreciably on curves; the curve on the gradient brought it to a snail's pace on full power. I discovered the gauge on the drivers was slightly wide, but pushing the wheels tighter on to the gears to bring them to gauge made minimal difference. I stripped the motor block down to see if my clamshell was rubbing on anything. Nothing evident but I filed possible pinch points just in case. I reassembled and found there was very little improvement.

In desperation, I assembled a duplicate Lyn motor block which JimmyB has kindly sent me - which looks almost new.

Another test run and exactly the same outcome! Too little power to cope with a standard train!!

I can only assume that, for whatever reason, the large worms seriously impede the motor's ability to transmit power.

My next resort is to see if I can replace the worms with smaller diameter versions. I've ordered a gear puller and have found out how to calculate the mod value of the worm wheels. I just hope I can find a couple of replacements somewhere......

I will not be defeated!! :eek:πŸ˜’

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Fri Mar 19, 2021 7:59 am

According to this online calculator, it looks like it's a 0.5 mod gear on a 2.5mm shaft which is reassuring that it's not something obscure.

https://www.technobotsonline.com/gear-s ... lator.html

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
Jimmyb
Fireman
Fireman
Posts: 492
Joined: Sat Nov 23, 2019 10:43 pm
Location: Weston-super-Mare

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by Jimmyb » Sat Mar 20, 2021 8:41 am

Rik, I believe that the smaller worm is the solution, but I do not believe anybody has mentioned what the issue (apologies if you have and I have missed it), I think this is all to with "moments around a point".

The centre of the motor spindle is the fulcrum, and the motor provides the power which is a constant (assuming constant voltage input) the the further you move from the fulcrum, less load is required to equal the power output, ergo the larger the worm the less power drive you have.

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Sat Mar 20, 2021 8:54 am

Jimmyb wrote: ↑Sat Mar 20, 2021 8:41 am Rik, I believe that the smaller worm is the solution, but I do not believe anybody has mentioned what the issue (apologies if you have and I have missed it), I think this is all to with "moments around a point".

The centre of the motor spindle is the fulcrum, and the motor provides the power which is a constant (assuming constant voltage input) the the further you move from the fulcrum, less load is required to equal the power output, ergo the larger the worm the less power drive you have.
Thanks Jim
That's exactly my thinking though as a former primary school teacher my explanations are far less eloquent. I was out on a walk with a mate (a former physics teacher) yesterday and I found the easiest way to explain it was to use my walking pole like a propeller. Much more effort was required to rotate it when my other hand was stopping it further away from the handle and much less effort when the resistance was closer to the handle.

My mate agreed with my practical demonstration and then explained it all with moments.....

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
philipy
Moderator
Moderator
Posts: 5033
Joined: Sun Jan 30, 2011 3:00 pm
Location: South Northants

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by philipy » Sat Mar 20, 2021 1:44 pm

ge_rik wrote: ↑Sat Mar 20, 2021 8:54 am
then explained it all with moments.....
Blond ones? :lol:
Philip

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Sat Mar 20, 2021 6:37 pm

philipy wrote: ↑Sat Mar 20, 2021 1:44 pm
ge_rik wrote: ↑Sat Mar 20, 2021 8:54 am
then explained it all with moments.....
Blond ones? :lol:
Melting ....

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
FWLR
Driver
Driver
Posts: 4262
Joined: Sat Aug 05, 2017 9:45 am
Location: Preston, Lancashire, UK

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by FWLR » Fri Jun 04, 2021 11:50 am

That is a blooming brilliant build Rik. You have mastered the art of this 3d printing stuff. Yes it is easy enough and the more you work on it, the easier it gets I have found, but I am still a marathon away from doing anything as brilliant as yours.


SUPBERB..... :goodpost


PS I was looking for another emoji to say how brilliant it is, but it seems to have disappeared....

User avatar
Lonsdaler
Driver
Driver
Posts: 1226
Joined: Tue May 20, 2014 9:50 am
Location: North Yorkshire

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by Lonsdaler » Fri Jun 04, 2021 1:13 pm

philipy wrote: ↑Sat Mar 20, 2021 1:44 pm
ge_rik wrote: ↑Sat Mar 20, 2021 8:54 am
then explained it all with moments.....
Blond ones? :lol:
:lol: :lol: :lol:
Edit - apologies, this post adds nothing to the thread, but Philip's comment made me laugh out loud!
Phil

Sporadic Garden Railer who's inconsistencies know no bounds

My Line - https://gardenrails.org/forum/viewtopic ... 41&t=11077

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Wed Jun 16, 2021 9:13 pm

I think I've cracked it!!


Only took me three months!

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
FWLR
Driver
Driver
Posts: 4262
Joined: Sat Aug 05, 2017 9:45 am
Location: Preston, Lancashire, UK

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by FWLR » Thu Jun 17, 2021 7:40 am

Fantastic Rik..Well done, she doe's indeed run very smoothly now. I didn't notice any slipping at all, what a fantastic feeling you must have had when you saw her running and pulling all those wagons.

I agree also about having to redesign stuff with 3d builds, I am always doing it..... :lol: :lol:

User avatar
philipy
Moderator
Moderator
Posts: 5033
Joined: Sun Jan 30, 2011 3:00 pm
Location: South Northants

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by philipy » Thu Jun 17, 2021 8:00 am

Looks fine to me, Rik.
Very satisfying when you get to this stage.
Philip

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Thu Jun 17, 2021 8:27 am

Thanks chaps. She still needs to be tidied up a bit and some of the detailing installed ( eg the outside frames) but I'm pleased with how she now performs. You'll also notice the chuff synch now needs re-adjustment but she's now much more controllable at slow speeds.

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

User avatar
gregh
Trainee Driver
Trainee Driver
Posts: 566
Joined: Sun Apr 01, 2018 5:44 am
Location: Sydney, Australia
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by gregh » Fri Jun 18, 2021 9:53 am

An A+ for perseverance Rik. You must be very happy to see it dragging all those wagons.
And a most interesting video too.
Greg from downunder.
The Sandstone & Termite's website: https://members.optusnet.com.au/satr/satr.htm

User avatar
mikki
Cleaner
Cleaner
Posts: 11
Joined: Tue May 24, 2011 1:28 pm
Location: Skibbereen, West Cork, Ireland

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by mikki » Fri Jun 18, 2021 4:00 pm

I really enjoyed watching the video, your railway is beautiful.

It's fun for me to see Skibbereen mentioned as that is where I live. :)
Michaela in West Cork

User avatar
ge_rik
Administrator
Administrator
Posts: 6497
Joined: Sun Oct 25, 2009 10:20 pm
Location: Cheshire
Contact:

Re: Lyn >> Schull & Skibbereen Erin(ish)

Post by ge_rik » Sat Jun 19, 2021 6:52 am

mikki wrote: ↑Fri Jun 18, 2021 4:00 pm I really enjoyed watching the video, your railway is beautiful.

It's fun for me to see Skibbereen mentioned as that is where I live. :)
A lovely part of the world and definitely on my list of go to locations once this Covid business is over :thumbup:

Rik
------------------------
Peckforton Light Railway - Blog Facebook Youtube

Post Reply

Who is online

Users browsing this forum: LNR and 7 guests