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Helve hammers Techniques to build and use sheetmetal shaping helve hammers.

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  #11  
Old 02-28-2012, 09:38 AM
Janne J Janne J is offline
 
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Hi,

David, I think you would probably pronounce it Jaane,

Ok, I understand...I have adjustable eccentric, and connecting rod..and the tool post, moves in a slot , it moves forth back, and little bit sideways.. the tool post is a m24 (24mm) thread, almost 1 inch (25,4 mm), so i can adjust it´s height...

the upper limiter is a must for me, but if I limit the stroke too much, the hammer has a strange rhytm..(so I play with the stroke, but if I change it much, I have to adjust the connecting rod)..since the spring probably is out of tune, for a moment, when it hits the limiter...i have been planning to make a limiter like Jim ´B´s latest version, so it limits the stroke from down...it doesn´t affect the hammer ´s rhytm....but i like my hammer...

didn´t the Bradley helve have both limiter´s , on up &down....
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  #12  
Old 02-28-2012, 10:53 AM
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Quote:
didn´t the Bradley helve have both limiter´s , on up &down
I don't know about the Bradley helve, but the Wray helve did and it worked super.
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  #13  
Old 02-28-2012, 10:56 AM
Janne J Janne J is offline
 
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Thanks for the info, now I know what my next mod is...when I have time to do it...
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  #14  
Old 02-28-2012, 11:20 AM
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I went to post a link to the helve tool post build.. the pictures are gone.

I am so confused to where, or how.. except they are not in my album.
The one I came up with is super easy to build and will not move in use. I'll have to find them.. probably renamed them, so I will have to resubmit them on the links.

With a helve, unlike a pullmax you don't have to keep bringing up the lower tool.. the spring over-throw takes the metal down to it. That is why it is so much faster.

Janne, Okay.. if you put a VFD on the helve you can "tune" it with a twist of a knob most the time to alter speed-inertia..
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Last edited by Dawai; 02-28-2012 at 11:22 AM. Reason: adding comment
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  #15  
Old 02-28-2012, 11:59 AM
Janne J Janne J is offline
 
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David,
Sorry,
I forgotted to mention, i change the height of the tool post, cause my dies arent all the same height, like my linear stretching die, has more height, then my radius die..still practising machining...
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  #16  
Old 02-29-2012, 07:00 PM
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Okay.. it's marking but shrinking..

QUESTION, will it shrink as good when the ridges are polished out of the lower die? Kinda like trying to hammer-tuck shrink on a slippery table top?
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  #17  
Old 02-29-2012, 07:11 PM
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David,
I can't speak for a helve but in the pullmax smooth / polished for dishing works best. For doming the jury is still out. tt
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  #18  
Old 03-01-2012, 12:47 AM
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Ron Nadia style UHMW die holder

One pass with "this" made "this"


I put the tear drop dies in, tried to "shrink" the back edge over further as I turned the part.. I fu-barred it and had to cut out the back edge.

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