The Home Machinist!

been there - done that - well worth the trip of you are on the island...

ah...the old brain is still functioning....

good luck drilling a 2-56 tap out....this is where an edm drill is worth anything you have to pay to use...

please be aware of something that I 'sort of'' remember Student Versions of Solidworks are not always 'upgradable' to the 'latest version'. I also seem to remember that models created by 'student versions' could not be imported by 'newer versions' of the software either. This may have changed...but ...

take the OD of the thread and subtract 1 pitch for the tap drill diameter

1/4-40 tap drill = .25 - 1/40
7/32 is close enough since I don't have a 1/40th of an inch drill

worked for me for 50+ years

do not depend on the checks INSIDE the pump to isolate the boiler...you don't want hot water / steam getting to the water end of the pump. best for each pump to have its own 'into the boiler' check valve...otherwise one leaky check can bring down both pumps. Feed lines are another matter. as long as...

dilly dilly - you can NEVER have too many ways to put water into a boiler...even if you never use them. I personally like pumps that go forward / back as opposed to left / right if you have that option. On smaller scales a left right pump can be tough to keep from derailing the tender. there is a se...

FWIW: I use white vinegar with a 'pinch' of salt tossed in.

if all else fails and it is an important ($$$) part -> find someone with an EDM DRILL.

I have a running on air chassis for this loco in my basement with Walschaert valve gear, all done by he late Jim Stuart.

Jim used LE drivers and a few other bits and pieces but everything else is to his design from the original B&M plans.

Only 5 directions?

A somewhat limited machine.....

Giggle: this is another one of those endless discussion threads... The Swiss were doing very accurate watch work long before any control method other than gears and cams was available....and if you are making very large numbers of the same part, the old multi-spindle, mechanical cam machine will sti...

I guess you guys burn different anthracite than we do up here in the north-east.