help for german used power nibbler

[mipop35]

Hi,

At: Home > Member > mipop35 > german used power nibbler I posted some photos of a power nibbler I recently bought.
It's a german one, traded by Hahn&Kolb (this is not the manufacturer). I think is from mid 50s and is a massive cast iron structure about 1" thick.

It has 2 speeds (unkown since I don't have the engine/pulley), fixed stroke (about 8mm), rotating top toolholder (need to fix it) and a stange mechanism in the bottom arm that allows some vertical displacement of the bottom toolholder agains a spring. This mechanism can be locked with a pin. I think I'll make some CAD drawing of the mechanism to clarify how it works.

I need to make some questions to the forum in order to restore the machine to the best working conditions for metal shapings.

The questions are:

1) speed. which speeds do you use for power hammering/forming and for cutting? how much power must the engine have?

2) stroke. my machine has a fixed stroke of about 8mm. Is it enough for hammering? Can I stand with only one stroke? which strokes do you use?

3) cutting tools. what material do I need in order to make cutting tools (soft iron sheets and aluminium)

4) collets. exist any dominant size for toolholders? If yes, can give me some dimensions?

Thanks in advance and regads,
Diego

[Gene_Olson]

Hi,

At: Home > Member > mipop35 > german used power nibbler I posted some photos of a power nibbler I recently bought.


Diego,

Could you post a URL for the image, or put that url between image tags (the ones that you get when you push the - Img- button at the top of the "Post a reply" page; then it will display right here.

Gene

[Richard K]

Diego,

You have a very lovely machine.

Stroke ........ at 8mm (5/16) it is just fine. A bit long for shrinking dies, but will work OK. it is just requires more care in keeping the material located in the die . That stroke should be nice for most other forming work; joggling, doming, and using Ron Naidia type die holders.

PLEASE...Please...please post a sketch of the mechanism. We are very interested in the spring damper section.

Collets should be no problem to make. Looks like simple metal lathe work.

How deep is the throat? What is the opening between collets.

Thanks for sharing the info with us.

Richard Kleinschmidt
St. Paul, MN
612-730-8132

[mipop35]

GeneO:
http://www.metalmeet.com/photopost/showgallery.php?cat=3271

richard K:
thank you for the info. I hope I'll measure deep throat this evening. I'll post it together with the sketch

thanks
Diego

[Gene_Olson]

Diego,

The bottom looks like it has the opening mechanism for putting in material what with that gear and all. The top end hammer doesn't look like it moves other than making it's stroke.

http://www.metalmeet.com/photopost/data/3271/222008spring_mechaism-med.jpg
http://www.metalmeet.com/photopost/data/3271/222009lower_base-med.jpg

Also, have you checked under that end plate on the top crank? There might be a pair of nested cams that would allow you to adjust the stroke length.
http://www.metalmeet.com/photopost/data/3271/222013top_turret_front.jpg

[mipop35]

I added some images about the "damper" mechanism. I hope you'll understand how it works.
please ask for more if necesary.

(also uploaded an inage with the logo of the manufacturer. anybody knows "PARX"?).

thanks,
Diego