Stuart build questions

Stuart build questions

This topic has 7 replies, 4 voices, and was last updated 17 May 2021 at 20:32 by Nick Welburn.

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16 May 2021 at 18:13 #545483
Nick Welburn
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@nickwelburn
I’ve made my crankshaft and piston for the 10v today. I’ve got a couple of questions.
the bore of my cylinder is rough. Even with a little oil it doesn’t let the piston smoothly drop.

I guess it needs a hone. But how?

Secondly in a moments stupidity I started on the block that the piston rod goes into. I decided to start by milling the top and bottom flat. To do this I cut the casting bar off. I now realise I needed that to use that to turn the outside diameter down. Any cunning ideas for this?

Or should I just order an new one and think about what I’m doing before I start next time
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16 May 2021 at 18:13 #10839
Nick Welburn
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@nickwelburn
16 May 2021 at 18:45 #545494
Former Member
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@formermember12892
[This posting has been removed]
16 May 2021 at 19:48 #545506
JasonB
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@jasonb
The cheap "brake cylinder hones" on e-bay will do, probably have to be the two stone one on that 3/4" bore.

You could tap the crosshead for the piston rod and screw it in then use the rod to hold it by in a collet, split bush or 4-jaw so the rod runs true while you turn the OD to fit the trunk guide. Bore and finish the trunk guide first then make the crosshead guide to fit
16 May 2021 at 21:11 #545520
Nick Welburn
Participant
@nickwelburn
Will a 5ba thread hold the part while I turn it? Maybe if I drill and tap deeper into the block and super glue it?
17 May 2021 at 06:59 #545539
JasonB
Moderator
@jasonb
With light cuts and a sharp tool it will, you can always bring up the tailstock ctr for added support, superglue won't make much difference.
17 May 2021 at 09:59 #545557
mechman48
Participant
@mechman48
'The cheap "brake cylinder hones" on e-bay will do, probably have to be the two stone one on that 3/4" bore.'

+1, Exactly what I have, & used on my !0V, works a treat & not expensive.

George.
17 May 2021 at 20:32 #545655
Nick Welburn
Participant
@nickwelburn
Ok – sorted that bit and learned not to start cutting without a plan for all operations! Will get a hone on order quick zip with the dremel and a polishing pad has helped considerably. May try the dremel with some valve grinding paste and see what does.
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