Author Topic: CONWAY 0-4-0 3 1/2" GAUGE LOCO  (Read 48789 times)

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #540 on: August 06, 2018, 09:11:50 PM »
Hi

The ring has a groove cut in with a parting tool. My parting tool is 2mm wide



Drill the holes



I found the easiest way to hold the ring was to clamp a lump of scrap wood in the bandsaw vise and use large screws to hold it rigid





Which gave me this



In the mill and machine the 1/8" slot





Followed by machining the profile





You may have noticed that the plans call for 4 brake blocks. The ring yielded 8. Its unlikely that I will wear out a set of brake blocks and need to fit the 4 spares so they will go into stock and maybe fit a future loco.

Next up is the brake shaft. Not much to explain here, only that I have used stainless steel for the shaft



The brake column next. Start by machining a bit of 7/8" brass and thread 3/8" x 26tpi



Drilling through by starting with a centre drill then a short drill followed by a long drill. I only have a 3/16" long drill but the shaft fits through nicely




Drill and tap a bit of scrap ally 3/8" x 26tpi



Screw the brass into the ally and machine to length.



Knock the top slide over a little and machine the taper. My myford doesn't have enough travel to machine the full length so I machined as much as possible then finished with a file and emery paper



The shaft I have made from stainless steel. Turn the little top piece and drill and tap from some 7/16" stainless steel. cross drill 3/32". Thread the top of the shaft



Screw the 2 pieces tightly together with a drop of loctite on the thread. then cross drill





A bronze collar and thrust washer. Bend a bit of 3/32" stainless steel for the handle





Cheers

Rich




« Last Edit: August 06, 2018, 09:20:06 PM by Firebird »

Online zeeprogrammer

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #541 on: August 06, 2018, 09:38:33 PM »
I'm a little confused.
You cut a groove with a parting tool then you milled a 1/8 slot (into that groove?)
Is the groove deeper than the slot?
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline b.lindsey

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #542 on: August 06, 2018, 10:04:33 PM »
Just getting caught back up on your build Rich. Love all the great photos and the details.

Bill

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #543 on: August 06, 2018, 11:02:44 PM »
Hi

Thanks Bill  :ThumbsUp:

Carl, cutting the slot with a parting tool just removes some waste. If you look at the drawing you will see that the slots are flat bottomed.

Cheers

Rich

Offline NickG

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #544 on: August 08, 2018, 03:34:53 PM »
Looks good Rich, you’re making it look easy!


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Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #545 on: August 08, 2018, 06:56:19 PM »
Hi

Thanks Nick

I don't know about easy  ::)

Maybe I should show more of the mistakes  :ROFL:

Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #546 on: August 08, 2018, 10:40:36 PM »
Hi

The forked lever starts life as a bit of 1/2" x 9/16" steel. Drilled and reamed and the first step machined away.



Tapped M2.5 The plans call for 10 BA which is approximately 1.7mm which seems a little fine so I opted for the bigger size



Machine the second step



Make the removeable fork





Machine the profile



Cross drill for a pin





Make the nut. I have used stainless steel





Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #547 on: August 09, 2018, 08:18:38 PM »
Hi

The levers for the brake shaft are first drilled then held on a mandrel and turned




Then profiled





2 pins for the driving brake hanger. I have made sleeves and used a 3mm cap head screw, all stainless steel





2 couplings. Start with some 5/16" stainless steel in a 5/16" collet in the lathe. Turn down to 1/4", drill and tap.



Held in a square collet block, cross drill.



Machine one side



Turn the collet block over and machine the other side



Change to a 1/4" collet in the lathe and machine the other end





Cheers

Rich


Offline Steamer5

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #548 on: August 10, 2018, 06:06:38 AM »
Looking good Rich.


Cheers Kerrin
Get excited and make something!

Offline Jakdaw43

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #549 on: August 10, 2018, 01:08:28 PM »
Excellent photos Rich...a real help to the newcomers to the hobby.
Cheers Stuart
Alias jakdaw43
Stuart alias 'Jackdaw'

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #550 on: August 10, 2018, 06:48:40 PM »
Hi

Thanks Kerrin and Stuart  :ThumbsUp:

Continuing with the brakes, a pair of beams are needed made from 1/2" x 3/16" flat steel bar so the first job is to machine some steel to size, I started with 5/8" cx 3/16"





Set up square in the mill and using an edge finder to locate a corner. From there using the DRO centre drill the centre









Move to the lathe and centre in the 4 jaw using a spring loaded centre and DTI



Turn and thread each end as per the plans except I have used M3 threads





Machine the profile





Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #551 on: August 16, 2018, 08:22:36 PM »
Hi

The day started well enough by doing a bit of zinc plating





Then made 4 pins for the brake blocks



The hole in the brake block was drilled No. 31 which is a few thou under 1/8" so the pins are a press fit



Followed by a bit of trial assembly work



At this point it became obvious the the brake links and rods etc were not going to fit  :facepalm:  :facepalm2:

Because I have changed the suspension to coil springs they are in the way of the pull rods.  :Doh:

The rest of the day was spent figuring a new way to operate the brakes  :headscratch: I think I have it sorted now so when I have it fitted I'll post more

Cheers

Rich

Offline Admiral_dk

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #552 on: August 16, 2018, 09:24:35 PM »
Oh man what a bummer - I really hope that the solution isn't a        :censored: (been there too many times) - but one that will make you fell good about it again.

Best wishes

Per

Online zeeprogrammer

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #553 on: August 17, 2018, 01:55:33 AM »
Bummer. Luckily, as it appears, it's far enough down the road not to stop you.  :ThumbsUp:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Zee-Another Thread Trasher.