bambuko loco works 0-6-2 (Fowler)

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bambuko
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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Mon Jun 01, 2020 2:19 pm

Drilling peg hole freehand on my drill wasn't entirely satisfactory :mrgreen:
so I have decided to do it proper way :thumbup: on my milling machine, secured to holding fixture.
Here I am using a wiggler to position the hole exactly half way between (it's 0.4mm in one half and 0.4mm in the other):

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Checking with centre drill (last chance to correct):

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0.8mm dia 5mm deep:

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I have spent some time sorting out a quill on my milling machine (it was stiff) - my fault, caused by overtightening the four bolts holding mill head.
When correctly torqued to 50 lbs/ft it has recovered and quill is now smooth and light :thumbright:

End result is quite acceptable :lol:

Image

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Re: bambuko loco works 0-6-2 (Fowler)

Post by tom_tom_go » Mon Jun 01, 2020 3:33 pm

Bang on!

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bambuko
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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Mon Jun 01, 2020 4:22 pm

tom_tom_go wrote:
Mon Jun 01, 2020 3:33 pm
Bang on!
:mrgreen: thank you
now I have to repeat this performance six times for the cranks proper (this one is just a test), but before I do it, I want to make (and test) quartering fixture.
More to follow...

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bambuko
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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Sat Jun 06, 2020 3:47 pm

My take on a quartering fixture.
V block in the centre (to locate the axle) and two stops, vertical on the left and horizontal on the right:

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With the axle secured in place (one wheel is missing, but that's because it is just a test piece).
Brass clamps securing the axle, also makes sure the crankping is tight against the stop.

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and ... ready to Loctite the other crank.
I guess, I will have to come up with some means of securing crank/crankpin against the stop?
Although I am reluctant to do it :scratch:

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