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From Kits/Castings / Re: Green G30 Sleeve Valve Engine
« Last post by dieselpilot on Today at 06:59:50 PM »
How many degrees after BDC does intake close?
From Kits/Castings / Re: Green G30 Sleeve Valve Engine
« Last post by Roger B on Today at 06:48:00 PM »
I think that I can picture this but can you post a drawing of the cylinder/sleeve/piston layout?

Your Own Design / Re: New Project Mill Engine
« Last post by scc on Today at 05:41:53 PM »
Thank you gents for your comments. I will try my 4 jaw first and if it won't "reach" then mdf on a face plate.  Thanks again.         Terry
Thanks for the suggestions guys and gals  :)

I had a think about how to turn the top cover overnight and came up with this idea.

First job was to face off the bottom (inner) side, there was a domed recess on this side but I bored this out to create a shallow flat bottomed hole and turned the cylinder locating spigot

With couple of bits of scrap I made a raised spigot and a centre drilled disc.

A drop of Loctite 638 secures the cover to the spigot and the drilled disc adds a bit of support

The bond was more secure than I expected so I was able to turn the top face without the centre support after turning the outer rim.

Next job is to drill for the 4ba fixing holes, I try to avoid the turny table if I can but in this case it is going to give the most accurate result. A fairly crude arrangement with a rule in my milling vice ensures the port face is squarely postioned.

Halfway and it's looking ok  :)

A bit more twiddling the handles and I arrive at this

I'll use proper studs later but for now bolts give me an idea of how it's shaping up.


From Kits/Castings / Re: Green G30 Sleeve Valve Engine
« Last post by Laurentic on Today at 04:12:10 PM »
Jo - glad to hear they run very well, only wish mine did.  The sleeve bore was lapped so as the piston just slid in.  I fitted 2 piston rings to mine.  The drawing calls for a sliding fit for the sleeve liner interface, and that's what it is, a close sliding fit.  Have oiled sleeve to liner interface and piston to sleeve interface.  Still getting very low compression.  Suspect that the compression air is leaking by through the sleeve port before it seals against the junk head ring and out via inlet and exhaust ports, when I test it on low pressure air this is the impression I am getting.  Were the ones that run built as per the drawings or were their any mods, does anybody know? 
I thought this was a control card problem as my Sieg C2 is 2016 vintage with the brushless motor, no high/low ratio and a complicated motor control card.

Turned out to be a loose connection on the forward/reverse toggle switch. This is this is an input to the control board, not the older multipole cleverly wired switch that reverses the power to the motor on its own. Its a two pole switch. Closed contacts for normal rotation, open for reverse. If you get a loose connection, the lathe will stop then reverse unexpectedly, probably ruining your work piece and tool.

Hope this is helpful to other Sieg C2 users.
From Plans / Re: Elmer's # 32 Tall Vertical Open Column 2X Size
« Last post by yogi on Today at 03:41:37 PM »
Coming along nicely Brian!  :popcorn: :popcorn: :popcorn:

That's an interesting tilting table you are using there. Could you post some more information about the table? Appears to be the right size to fit in the mill vise. I like it!  :ThumbsUp:
From Plans / Re: Muncaster Grasshopper - Work in Progress
« Last post by kvom on Today at 03:22:30 PM »
When I got the CNC mill my rotary table went away.  Still, something to think about if other methods are unsatisfactory.

My little CNC lathe might work well for 1-piece solution in aluminum or brass, but probably not in steel.  I have a large amount of 1/2" square and hex brass to play around with.  I doubt brass would look appropriate for this model, but powdercoat would solve that.
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