Optical centre punch

[knoba]

Knoba, Like I said I just love this thing and will be making one soon but realized you had a 17.8885mm spherical radius for your optics...how on earth did you determine that let a lone make it? I'll have to hunt for a tin though!

I'm not that smart!

The radius of the optic was set to allow for some manual adjustment, later by trial and error, on the lathe. The actual radius ended up somewhere near 9/16th. The optic was gradually altered until it appeared to give a good magnification without too much distortion. Only the top surface of the curvature of the optic needs modifying as needs require.

Sometimes I get stuck knowing where to start with a project (like with my welding turn table). My answer, to myself, is just to start it, anywhere, somewhere, the answers will define the questions that need to be asked.

Thank you for your compliments!

Let's not forget the pink packing foam. It was specially imported from China...

**Have updated the cad file and changed the optic to a 14mm radius.

[knoba]

A really good and unexpensive idea !

Thank you, Okapi, nice compliments, much appreciated!

[PJs]

Thanks Knoba, I get it about "just start" and that it would be a hunt and peck for optimum clarity and magnification...especially with trifocals. Don't have a ball turner for my lathe yet but pretty good with a graver. Thanks for a good starting radius and no worries about the foam...have a bunch! Need to look at your turntable again...but have to say, you are one Prolific builder!!

[Okapi]

The simpliest you make, the most efficient it is and the more reliability you have, polycarbonate magnifying glass are the best unexpensive friend too for helping us after 50 years old…

[kbalch]

Hi knoba,

Very impressive device! Your Optical Center Punch is the 'Tool of the Week'!

You'll be receiving one of our official HomemadeTools.net T-shirts:

Just let me have (via PM) your details (size, color choice, and mailing address) and we'll get things processed directly.

Congrats!

Ken

[kbalch]

This thread has been moved to the Must Read subforum. Congrats (and thanks) to knoba for making such a valuable contribution!

[PJs]

Congrats Knoba! Simple and Elegant always a winner in my book!

[knoba]

Wow!

Thanks for the award & thanks for the compliments, guys!

[kbalch]

Hi knoba,

Don't forget to PM me your info and shirt selections (size & color)! We'd like to get it right out to you.

Ken

[tonyfoale]

Nice one..