Automatic center punch

[Makintrax73]

As a beginner this project was a real skills stretching experience. My first single point threading on a project, internal too. I had to make the trigger 4 times, the hammer 4 times too. So far it seems to work. Not sure if my hardening job will hold.





Sure wish I was better at knurling. Probably should have left that off and did half a dozen practice knurls first.

 

[SLK001]

It doesn't look like your knurling tool was exactly perpendicular to the surface - one side was more dominant (pressing more) - and not deep enough. Knurl the raw stock first, THEN turn it to size and your knurls will be more proud of the surface. Your threading looks excellent as does the fit. Chuck up your point on the lathe and use some emery paper to remove the discolorization of the metal (unless you like the colored look).

An overall good job.

 

[brino]

Great looking results @Makintrax73 !
Congratulations.

There's no better way to learn than to jump in and build a project.
All your new skills will be very valuable on the next project.

I am a big supporter of doing "practice parts" to figure out what the machines (and my own) limits are, order of operations, etc.

Well Done!
Brian

 

[Just for fun]

Looks great!

How in the world did you single point those internal threads?

 

[tjb]

As a beginner

That's very impressive for 'beginner' level work. Beautiful.

 

[rwm]

That is awesome. I am trying to figure out why I have not made one?

 

[Makintrax73]

Looks great!

How in the world did you single point those internal threads?

In actual fact I tapped the first hole and got very frustrated with my cheap taps. On the 2nd I decided I had little to lose and single pointed it. I used an accusize internal threading tool. Bored the hole quite a bit deeper than required. Set up a dial indicator and killed the half nut at as near the same depth each pass as possible.....



The sharpie mark is a "back up failsafe"

 

[7milesup]

That is really awesome! It looks really nice.

 

[rwm]

Perhaps project 2 should be a good knurling tool?

Knurling tool build

I have a poor quality pinch type knurling tool that so far has not done well. I believe the machine that cut the arms was out of tram and the arms are crooked. After looking at prices I decided to make my own. I am thinking about something like this: To get started I bought these: My...

www.hobby-machinist.com

 

[pontiac428]

Here, the first 20 pages of the Dorian knurling catalog are instructional details, tables, and equations for perfect knurls of all types. There is a method to it, believe it or not. Attached below.