Building a 31/2" Gauge Locomotive Engine

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CrewCab:

--- Quote from: sbwhart on June 05, 2009, 02:26:53 AM ---A filing button is just a sacrificial guide that you work up to with a file to get nice neat rads,

--- End quote ---

Did I say I had an idea what they were :thumbup: .................... I was completely wrong :lol: .................. assumption, the mother of all "mistakes" ::)

Thanks Stew, excellent tip :headbang:

CC

sbwhart:
Now her's an intersting little chalenge the Reversing Shaft

You can see from the drawing that its a bit on the spindly side, with these sort of components its always worth it to try and understand the function of each feature, the two 1/8 dia at each end of the thread have to be concentric with the thread as these are bearings that keep things lined up the Square and the 9ba thread keep the handle on the shaft so its not so important thet they are concentric, in other word they can be turned as a second op, also with this typ of component the operation sequence is important.

So first job is put a small centre in the end of the bar, and then supporting it with my nice little running centre ::) turn up the 3/16 dia by 2" length (don't forget to allow for the removale of the centre hole in the length.) Tip you need a good sharp tool for this type of work HSS is ideal.

Then turn down the 1/8 dia for the longer length (where the square is to go)

Cut the left hand thread with the die

Turn the 1/8 dia at the other end and part off

Then make a 1/8 brass split bush.

Then griping by the split bush turn it down to 3mm for the square (I went away from drawing for this bit)

Then turn down for 8BA and run the die down it (no pic)

To file the square I used the bush to grip in the vice to get one flat, then with this flat up against one edge of the vice it alowed me to file the other sides square (hand eye cordination) I left a bit of meat on the square to alow a bit of fudge factor to fit to the handle when I make it

I made two in case I had a scrapper.

I'll post a pic of the finished shaft when my camera recharges.

But its job done

I do like jobs like that :D :D :D :D

Have fun

Stew

Stilldrillin:
That`s marvellous!

You`ve got a LOT more patience than me, Mate....... :bow:

(Not Stew)

sbwhart:
Thanks Not Stew

Her's a pic of the completed Shaft with a spare

Not Dave

CrewCab:
Not Dave ::)

Cracking write up and good pics, thanks for takin the time to share it with us, I suspect posting the thread took longer than making the part though :thumbup:

atb

CC

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