The Home Machinist!

Steve S wrote: ↑

Wed Feb 26, 2020 5:13 pm

Does carbon fiber wear tooling quickly ?

Yes.

Back under way. (hopefuly) Too much real work and too little time lately to tinker with this...

Made a couple of tools this afternoon so I can get started fitting the barrel.

Barrel alignment tool and fitting bushing.

What alloy steel?

45 isn't really all that hard. Off the shelf pre-hardened 4140 is 38-42RC and is nice to work with.

How did you regulate the temps?

I have a pile of GTN2 parting inserts. I had a toolholder like this: gtnB.jpg but the problem is that the lower portion is not well supported and it actually snapped off. Tool was cutting great - right until it wasn't cutting at all. I don't get why they just don't make the underside larger - it's ...

Shouldn't be a problem for you to mill it down.

I've done similar to a couple and have found them to be right around 50 RC hardness on ones I've tested.

Here is the link to what Harold is referring to.

https://www.chaski.org/homemachinist/vi ... =engraving

These are the parts Mr Ron is referring to.

https://www.chaski.org/homemachinist/vi ... 4&t=109009

You can hear the difference in the cut when comparing a three jaw chuck and a 5C collet when cutting small diameter stock. The 5C has full support of the stock.

Looks like a new one.

Nice score!

ctwo wrote: ↑

Fri Jan 31, 2020 11:44 am

I admit, all those knobs scare me. Why are there like 32 knobs on that thing?

I remember thinking that very same thing when Steve posted a pic of his. (I still use my 45+ year old Miller transformer based TIG)

Congratulations to all involved in this project!

That is quite an accomplishment!

I too am beginning to realize that the ratio of time to projects isn't as favorable as it once seemed...

About half way through the engine runs. All's perfect so far.

It looks a lot smaller once it's packed in there...

Propeller diameter is 11' 2".