[TheForge] power hammer

Fri Jan 16 13:41:00 2004

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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