The Home Machinist!

NP317 wrote: ↑

Tue Jun 16, 2020 10:12 am

Unscrew the Zerk fitting and stick in a wire or wooden Q-Tip end to see what comes out upon removal.
RussN

I've done a bit of that getting grease out of oil passages... just sayin.
Tiny little drilled holes in a casting. They had to open it to pack it with grease.

On the bearing races, rather than sleeves on the axle, how about boring the end of the axle and pressing in purchased hardened dowel pins? (axle is shorter of course)

Haven't had that happen, and I'm glad! I know one thing that is worse......a scorpion in your boot. One of those little translucent ones. Double :shock: Glad to hear some one else has experienced this. I wasn't sure if I had stuck my foot in boiling water or an electric socket. Mine was one of the ...

Are those weed potions prototypical?
This looks like a bunch more fun.

Thank you Harold. I am "only" 61 but I am running on 3/4 of a set of lungs.

ChipsAhoy wrote: ↑

Sat Feb 29, 2020 6:47 pm

I have plates made for my, yet unfinished engine, because of an error I did while machining. ......
Scotty

How did you secure the false seats to the castings?

What you should take away from this is that it is NOT a tolerance issue. It is an engineering issue, one of not choosing a size that will provide the necessary clearance to compensate for the undulation of the engine as it moves along a not so perfect track. H Which is exactly what I intended to co...

I don't think this is the correct takeaway. It seems you are mixing up clearance with tolerance. They are not the same. I'm surprised others have not chimed in here, as this has been covered here on Chaski before. OK, I'm not sure what you think I don't understand here. Tolerance in my shop is the ...

Yes, that is what I have. Did not know where it came from though. This is for a smaller 7 1/2" gauge loke, cylinders and saddle are grey cast iron. Say larger than a Fitchburg but smaller than a standard Mogul. They'll be silver soldered together. The port areas I have in the drawings now proportion...

Good advice. I learned this from my first mentor, the chief inspector for an aerospace tool & die works. He built his first locomotive to "plant" tolerances and it wouldn't run. As soon a one end of a part heated up and the other end of it didn't, things locked up solid. Relieving almost every slid...

I've been reading the RRSC "engineering manual" and also some old steam engine design books based on full scale practice. RRSC manual states ports should be at least .4 * diameter of cylinder long, then backs into width. The .4 factor is based on making cores that will stay during a pour. Writer end...

Looks like there is a little bit of pipe proud of the female part. Hacksaw blade to top of threads, take a punch and collapse the pipe. If you can get it started collapsing, you've got it.