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View Full Version : Tested: Shogun automatic center punch (Made in Japan)



MattiJ
03-04-2019, 11:23 AM
Local auto store had Made in Japan automatic center punches that looked nicely made so I bought one to replace the sh*tty chinese ones I have.
Like this one: https://protooling.com.au/products/shogun-japan-adjustable-auto-centre-punch-130mm

Tested on hot rolled mild steel = OK.
Class 8.8 metric bolt (about same as american grade 5) = not a slightest dent and the center pin is flattened out!
Tested with file, soft like mild steel. OK maybe hardening is fubar.. heated with propane torch and quench to water. Still soft as limpy d**k!

Turned the center pin out of scrapped HSS tap, now punching marks to even a bit harder 12.9 class / grade 8 is not a problem..

https://i.imgur.com/3TIutGYl.jpg
https://i.imgur.com/61GFq9El.jpg

A.K. Boomer
03-04-2019, 11:32 AM
Wow - wonder if you got a dud? good fix taps are pretty dang hard that's for sure...

CCWKen
03-04-2019, 11:46 AM
Wow - wonder if you got a dud? good fix taps are pretty dang hard that's for sure...
But I can attest that they are damn brittle too. :cool:

Nice fix all the same.

MattiJ
03-04-2019, 01:15 PM
Wow - wonder if you got a dud? good fix taps are pretty dang hard that's for sure...

Possible. Wasn't going to try my changes by asking for replacement, worst case I get equally crappy one in exchange and for sure spend more time than what I need to turn new one from HSS.

BTW manufacturer is probably I-eishin
http://www.i-eishin.jp/archives/ponchi

They have also carbide tipped center punches, maybe that would be better. (or maybe it would crack with my luck)

MichaelP
03-04-2019, 01:25 PM
The hieroglyphs clearly state that the punch was proudly reverse engineered and manufactured in the People's Republic of China. ;)

1200rpm
03-04-2019, 02:27 PM
intended for woodworking???

TGTool
03-04-2019, 06:05 PM
I've got one I acquired used almost 50 years ago. American made. I don't know how the original point would have held up because someone before me has brazed a small carbide tip in it. It works wonderfully well, I've never had to sharpen it all these years.

metalmagpie
03-04-2019, 10:17 PM
I used to fabricate for a living. I used Starrett and General automatic center punches. Truth is, I prefer the General.

These days I don't use an automatic anymore. I have a prick punch that I keep in immaculate condition. With it, I can feel the intersection of two crossing scribed lines and in fact catch it with the point. I get really accurate punch marks that way.

metalmagpie

754
03-04-2019, 11:06 PM
I tried same one about a week ago, no power behind it, and can't make it hit harder.
My 30 year old import one is still working fine .and I can vary the force that it hits with..
May have sharpened it once, but always works.

754
03-04-2019, 11:09 PM
Prick punch to start, then Mark harder with a punch and hammer ..right. ? Done that..
Used to use the twirly Scriber to mark the crosshair the follow with hammer and punch..

PStechPaul
03-04-2019, 11:16 PM
I have an old Starrett as well as one I got from Harbor Freight some years ago. I had to replace a small leaf spring in the Starrett, but it is still not very reliable. The brass plated one worked OK for a while, but then became unreliable. I found that both of them worked much better after oiling the mechanism. I don't recall having any problem with the point being not hard enough.

http://enginuitysystems.com/pix/tools/Center_Punch_2439.jpg

http://enginuitysystems.com/pix/tools/Center_Punch_2440.jpg

http://enginuitysystems.com/pix/tools/Center_Punch_2443.jpg

http://enginuitysystems.com/pix/tools/Center_Punch_2444.jpg

Both of them work well on the head of a grade 8 bolt.