Finishing off a 5" Gauge Simplex Loco

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sbwhart:
Kjelle:- I went through the changeover in the Uk from imperial to metric system in my early 20is, so I'm fairly fluent in both systems, in fact I use to use my fluency to bamboozle and young graduate who got up my nose by simply swapping from one to the other and back again by the time I was finished they didn't know if they were punched or bored.

:D :D :D :D

Any way on the Loco front I made a jig to correct the crank throw it just a simple mandrel a good fit on the wheel bores then I just off set to the correct throw, locked everything up on the mill and then passed an end mill down through the bore I used an end mill so that it would follow its own path and not try and follow the existing hole. My first attempt I tried to correct just the outliers with a 8.5mm end mill, but this didn't work I was taking to fine skim off It needed a bigger end mill, so I decided to stop pussy footing about open them up 3/8" and do all the wheels.

It cam out great slipped a 3/8 bar into the crank hole and the holes for the axles all line up perfect.

Just need to pick up a length of 7/16" sliver steel to make new crank pins tomorrow.

Stew

Stilldrillin:
Nicely done Stew! :clap: :clap:

Coming across this type of job. I often wonder if the original machinist has pop marked 'em out, individually. :palm:
Then drilled, on the bench drill...... :loco:

David D

sbwhart:

--- Quote from: Stilldrillin on September 01, 2013, 11:42:29 AM ---Nicely done Stew! :clap: :clap:

Coming across this type of job. I often wonder if the original machinist has pop marked 'em out, individually. :palm:
Then drilled, on the bench drill...... :loco:

David D

--- End quote ---

Yes I think that was the case also, from what I've found he was either in a big hurry or he just didn't understand about square-ness, alignment, geometry of parts and how things work together.

But what really annoyed me was my own stupidity for not checking out the throw sooner I must have spent getting on for three weeks trying to get the coupling rods to function, I just assumed that no one would have got them wrong to me it so obvious that it is important to get them all the same, and it not difficult to do its in all the books:- I think I'm on top of it now though.

Stew

sbwhart:
:ddb: :ddb: :ddb: :ddb: :ddb: :ddb:

Well assembled the wheels into the frame with the coupling rods and they turn over a dream 2000% better.

I'm one happy bunny.

Stew

Stilldrillin:
Happy bunnies is good......... :thumbup:

David D

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