The Home Machinist!

Jim
Lima's standards do not have any info on port design.

Jim
In two stroke engines the racers will go with exhaust port widths up to 60-70% of the bore.
I have a copy of Lima's standards, don't know if there is anything in it about this but I will look tonight.

I have bought a spool of thus but haven't had a chance to print. Looks very promising.
https://us.polymaker.com/product/polycast/

Harold

Your post reminded me of a saying I heard about musicians but it can be applied to any skilled endeavor.


"An amateur musician practices so they can get it right, a professional musician practices so they can't get it wrong"

Harold
The video worked fine for me

We were having trouble figuring out what to do with all these photos my wife and daughter and myself were taking with our phones. I went searching and found out about NAS (network attached server). They are not very expensive and have many features that are handy , at least for me. The one I use is ...

Thanks Harold
Yes forgot to mention relief. Some I have done worked without having to relieve others had the be relieved. Just have to try it and go from there.

Look at woodruff key cutters. McMaster has a 3/64 (0.047)thick 0.5 dia. Don't know if that is close enough for you application or not. I have taken woodruff key cutters and ground the thickness to what was required on a surface grinder. Clamp them in a v block in the vertical position and grind as r...

Here is a sign in our shop
Don't care if its manual or CNC its still just a tool for a skilled person to use.

I have done thread milling pretty much like Rich stated above. Done both with CAM (G-code) and by conversational programming on my Hurco which has a Helix feature. Only difference than what Rich does is I use a single profile cutter in place of a single point cutter like he does. https://www.mscdire...

Rubber bands around the jaws and parallels
They don't hold up the best but work at any jaw opening

Hi Chris Welcome To answer your questions 1. Spanner tight, Tightness is relative to what you are holding in the collet. Tightness for a delicate piece will be greatly different than that of a cutter/endmill. 2. Check out this link explaining Watchmakers lathe collets, it will give you more info tha...