Interesting tool.

[John Stevenson]

Malc, the scrappie called round today and brought a tool to show me that he's picked up.



It consists of two hardened punches and a tension spring, what you can't see is that one punch is longer that the other inside the spring and they are touching at the internal ends.

It's an automatic centre punch, you put one end on the mark and pull the other end to expand the spring and let go.

Depending on which end you pull determines the weight of the pop mark due to the differing weights.

So simple and fool proof after these normal sort we are used to that never bloody work or if they do the pop mark is so minute it's a joke.

John S.

.

[Baldrocker]

John
Just another reason to cultivate scrap dealers, they can be really nice people.
That one goes to the top of the to do list in fact I'll do it this arvo.
BR

[websterz]

Ummm...what's an arvo? 

[John Hill]

Arvo?  There will be another along today just after lunch!

[dsquire]

John Stevenson

What a bloody good idea. Everybody should have one of them. 

Thanks for showing us that John.

Cheers 

Don

 

[websterz]

Arvo?  There will be another along today just after lunch!

Someone telling me to get off my a**e and clear the d**n dishes? Thought that was a Mrs. Webby...

[John Hill]

Arvo?  There will be another along today just after lunch!

Someone telling me to get off my a**e and clear the d**n dishes? Thought that was a Mrs. Webby...

Ummmm..... 'Arvo' is 'strine for 'afternoon'.

[Darren]

Yes it mean this afternoon over here  .... 

John, my guess is that one end also slides inside the other so it doesn't bend on the spring?

Nice idea ..... 

So it's not just me then that can't seem to get those auto punches to work properly .... 

[bogstandard]

They always work for me.

I've got a 14lb sledge sitting in the corner for persuading them.

A great concept tool, and I am sure there will be a few that gets made now.


John

[PTsideshow]

General Tool has been selling them, over here for years. and another of the cheapy tool makers/ sellers had them for sale as snap punches. I have had one for years.

And I have the same problem with the 3 auto center punches I have. They never seem to work more than 3 or 4 times then miss.

They are also sold as wood nail starters, and sets
http://www.daggertools.com/m5_view_item.html?m5:item=32R00-1

[Raggle]

or for really tiny work  -  http://www.schsm.org/html/marv_klotz_75.html

better still, combined with this  -http://www.schsm.org/html/marv_klotz_29.html

The second unit has other uses on succeeding pages. This is a must make when I get my new mill.

From a sparring partner of John's too

Ray

[Stilldrillin]

Bought mine off Ebay a couple of years ago.

I find it`s much easier to use than position the punch &, "where`s the hammer gone?" 

Used it to mark all the bolt holes on my carport roof...... Then 1/4" of the large end broke off, in fair service..... It was as hard as glass! 

Sharpened again..... It`s still in use! 

David D

[jim]

i've had one for about 20 years, never had regrind it!!

main benefit of this design is that it doesn't get used for anything else!!

[John Stevenson]

Ray,
Thanks for that link to Marv's main site, I never knew it existed, bookmarked it and will study it later.

It appears that the tool I showed is well known in the US but little known here, one of those openings where the internet really comes into it's own.

John S.

[mklotz]

Ray,
Thanks for that link to Marv's main site, I never knew it existed, bookmarked it and will study it later.

It's a nit but that isn't my main site.  It's my area in our local metalworking club site for which the home page is:

http://www.schsm.com/

My site, where all the free machining programs are located, is shown in my sig.

[John Stevenson]

That's why I'd not seen it then Marv. Still looks interesting.

John s.

[Raggle]

Thanks for that link to Marv's main site, I never knew it existed, bookmarked it and will study it later.

How odd. I wonder if he knows about yours?

Ray