[TheForge] Cylinder Size

Sat Jul 12 10:27:01 2003

I just rented my shop out to a friend who has never used a power hammer
before, in 20mins he was doing short tapers on 16mm square bar with a little
instruction from me. Thats at 230 bpm or so, mabey slower the way he was
running it a little more carefully than I do. So I dont know how much of a
learning curve there is on a hammer, hes already done plenty of hand hammer
work which helps I guess. Faster and harder the better I say, you can always
throttle any hammer back until you get the hang of it.
----- Original Message -----
From: "GHS" <[email protected]>
To: <[email protected]>
Sent: 12 July, 2003 1:28 PM
Subject: Re: [TheForge] Cylinder Size


> While I was in the process of convincing myself to part with the money for
> my Bullhammer 90, someone I do not remember who. (perhaps Mark Mondloch or
> Bob Schade) asked me two very good questions.
>
> Why so heavy? (The 90 is 30 times the weight of  my normal "heavy"
> hammer.)
>
> Why so fast? Why do you want a hammer that works faster than you can
> think?
> Again at 250+ BPM  is a whole lot faster than I could ever swing my 3#
> much less a 90# hammer. It can do some magnificent things before I can
> react. Like the sign on the side says "Engage Brain  Before Operating".
> There is definitely no room for a brain fart.
>
> These are good questions both. The only problems that I had learning to
> use the hammer was in learning to mitigate both its weight and speed. It
> is a lovely tool just had to learn the proper eye / foot coordination.
>
> I am thinking if I was just setting up or helping someone else to set up a
> small weekend warrior shop, that I would think of something in the 80 to
> 160 bpm,  20 to 40 lb. range. You couldn't form railroad track with it,
> but most of us do not anyway.
>
> Mike Graf
>
> Mike Linn wrote:
>
> > I'm running a 5 way dual pilot with a 2.5{quot} cylinder and my hammer
> > hits HARD....
> >
> > half a dozen hits absolutely splinters a 2x4....
> >
> > mike
> >
> > At 06:43 PM 7/11/2003 -0500, you wrote:
> >
> > One of the problems I've noticed is
> > the relatively soft hit if the Kinyon
> >
> > style hammers.
> >
> >  I suspect the automatic reversing switch in the single pilot
> > control is
> >
> > valve is the culprit, since the piston switches direction before the
> > hammer
> >
> > hits the billet. This also reduces dwell time of the hammer on the
> > billet.
> >
> > A double pilot control valve will eliminate this problem but the
> > bottom
> >
> > pilot valve must be adjusted for the billet thickness.
> >
> > Is there any brave soul out there who has played around with stroke
> >
> > completion sensors to maximize hammer dwell time and automatically
> > adjust
> >
> > for stock thickness?
> >
> > Chuck
> >
> >            Mike
> > Linn
> >
> >      Artist Blacksmith
> >          McCalla, AL
> >        AFC Webmaster
> > http://afc.abana-chapter.net
> >
> > Some people are like Slinkies...not really good
> > for
> >
> > anything, but you still can't help but smile when you
> >
> > see one tumble down the stairs.
> >
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