[TheForge] power hammer

Fri Jan 16 15:06:00 2004

Steve,
       Jock also said

"The Clutch Mechanism, invented by Ray Clontz, from Charlotte, NC is truely 
ingenious. AND it works very smoothly as well as being easy to build. The 
hammer speed is very easy to control with the clutch and takes no practice to 
get used to feel. The mechanism is simple. A steel wheel on the motor shaft 
rubs an inflated rubber tire."

I built one of these hammers, and it works great.  About 120 bpm at top speed 
with about 50 lbs of hammer.  Not super fast, but more than fast enough for me.

Daniel Kretchmar
www.irontreeworks.com

Isn't sanity really just a one trick pony, anyway? I mean, all you get is one 
trick, rational thinking! But when you're good and crazy�ooh hoo hoo hoo�the 
sky's the limit! 
The Tick

Quoting Howell Steve <[email protected]>:

> Not to deter anyone but I'll have to put in another plug for Dan Dreyers
> 'junkyard' hammer on the same site. Dan's hammer is the only home-made
> clutch-less mechanical I've seen that that made people stop in their tracks
> and say 'Wow!' I like the way Dan thinks; get rid of the clutch and use some
> modern technology, just like the kinyons.
> 
> Jock's description of the clutch on the NC JYH sums it up:
> "COMMENTS: More to come    Although this hammer worked well there was a lot
> that needed to be optimized. The machine ran a little bit slow for a small
> ram weight machine (40# to 50#). It could stand a larger steel drive wheel
> or a smaller diameter tire. With this change the spring would need to be a
> little heavier to perform optimaly at full speed. The faster the machine the
> stronger the spring needs to be to keep proper timing. - guru"
> 
> Sounds like alot of tinkering or a good reason to build an air hammer.
> 
> 
> Steve
> 
> 
> 
> 
> -----Original Message-----
> From: Daniel Kretchmar [mailto:[email protected]]
> Sent: Friday, January 16, 2004 10:13 AM
> To: [email protected]
> Subject: Re: [TheForge] power hammer
> 
> 
> Actually a really easy clutch can be found on the NC-JYH on anvilfire.  No
> machining necessary.  Small (3.5 inch) Steel wheel on a motor.  Motor pivots
> 
> and presses steel wheel onto a tire.  The harder you press, the more the
> wheel
> engages the tire, the faster the tire goes.  Your toggle/spring/shock is
> attached to an eccentric axel on the tire.  It works.
> 
> Look at http://www.anvilfire.com/power/
> 
> and check out the JYH Catalog.  Read the info on the NC-JYH.  It's got a
> really
> easy clutch.
> 
> 
> Daniel Kretchmar
> www.irontreeworks.com
> 
> Isn't sanity really just a one trick pony, anyway? I mean, all you get is
> one
> trick, rational thinking! But when you're good and crazy...ooh hoo hoo
> hoo...the
> sky's the limit!
> The Tick
> 
> 
> Quoting Andy Vida <[email protected]>:
> 
> >
> >
> > Ralph Sproul wrote:
> >
> > > Pretty much the hardest thing to build on a mechanical hammer would be a
> > > good mechanical friction clutch.  Anyone know of a good mechanical
> clutch
> > > and not air, electric or magneticly operated?
> >
> > 	Clutch configuration is a pretty simple affair in principle.
> > 	If we're talking about building one from scratch, there
> > 	would be a good bit of machining involved.  A conical affair
> > 	is common enough.  They provide very good lockup, progressive
> > 	action, and good release with low thrust loadings, as opposed
> > 	to a flat plate affair (like an automobile clutch) that needs
> > 	far higher pressure to lock up, or multiple plates which
> > 	greatly reduces control (ever ride a three or more plate clutch,
> > 	they are either full on or full off with little in between).
> > 	One exception to this would be a motorcycle clutch, so perhaps
> > 	a unit out of an old junker (750 Honda?  Harley?) would work,
> > 	but you'd still probably have a good bit of machine work between
> > 	you and a working mechanism.  With a good long treadle, the
> > 	spring pressure might be OK.
> >
> > 	Anyhow, I like cone clutches for such applications and many
> > 	of the hard-mechanical hammers use them.
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