Recent content by plipoma

I have built the Coles Corliss and sad to say I didn't keep a 'do's and don't' list but one thing comes to mind: The drawings I have called for 8-32 machine screws in too many places, particularly the cylinder assembly. I used 5-40's and certainly would not use anything larger than 6-40's. I...

Looking really good! Good plan!

The blow by groove actually improves sealing. Any flow causes a turbulence, which acts somewhat as an air seal. I used 12L14 precision stock from McMaster Carr.

Attached is photo of slitting saw operation and it looks like I used end mill for bevels, this was 4 years ago and my memory isn't serving me well. The third photo shows finished valves, note I cut a small groove in each end to serve as an air seal for blow by.

The valve was not trimmed to length and in a spin index. Don’t remember for sure but think I used an end mill. I’ll try and find pictures.

Dave, I used a 1/16" wide, small diameter slitting saw in the mill and finished the ends with a jewelers file.

Has anyone modeled (scale drawings, etc.) any of the early 1930's, 2 cylinder John Deere engines? Or know about such?

I can't open the files! I don't have Alibre, I have Draft Sight that uses .dwg files. Is it possible to those files that would respond to .dwg.

Try heating the case with a small torch. If there is not a keeper or snap ring, that should set it free.

I just tried to send you an email and your box is full. I think I can help you. Contact me!

I have built a Coles Corliss, finished about two years ago and sorry to say, I didn't keep build notes although I have a U-tube of the engine running (link below), some of the machining setups in a .pdf file and a few up front comments. First comment: the drawings mostly call for #8 screws...

McMaster Carr has 1/4" wide by 50 ft long graphite tape for $8.40 along with other sealing materials.

Yes, O'Rings have too much friction. There is a product called Grafoil! It's in the form of a tape and has no fiber base. I have used it very successfully. Make a 2 piece mold the size of the gland you need, pack the mold with Grafoil then pressing it. It makes a perfect gland that seals with...

Here is a good article about stress crack corrosion in SS, Stress Corrosion Cracking- SCC: In Depth Guide

I think stainless steel suffers from stress crack corrosion, it doesn't do well under stress.