[TheForge] Air hammer
A. Vida
[email protected]
Sat Jul 26 12:47:01 2003
Jerry Frost wrote:
>
> At first I was going to make it a down draw design like the Kickass. It was
> so compact and clean looking, about 5' tall and about 3 1/2' long. Then a
> list member I was bouncing ideas off of gave me a review of using a Kickass.
> He liked it fine except dirt, scale, etc. kept contaminating the rams and
> greatly slowed it down. I can also see increased wear to the seals and
> piston rods.
Reverse the cylinders, making it a MyAss hammer:
Kick ass... MyAss:
____ ____
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || | | | |
|| || |____| |____|
---- ---- || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
| | | | || ||
Use a larger cylinder if you're concerned about the rods supporting the
little bit of extra weight and of course, spread them out a bit more
to provide sufficient clearance.
Or shield the rods... perhaps something telescopic?
How about an oil bath, e.g.:
||
||
||
||
||
||
||
||
||
||
||
||
||
____*||*____ <-- felt wiper, reservoir's top is inverted cone
| || | to drain oil back in.
| ---- |
| | | | <-- fill with light oil perhaps 1/4" above seal
|___| |___| allowing debris to wash away from it and
the
| | rod. Felt wiper keeps larger crap off rod
| | and excessive oil off rod on up-stroke
| | Reservoir could be made remote and pump oil
| | up into a smaller cup if one wishes to Rube
| | out a little
| |
| |
| |
| |
| |
| |
> So, I went back to an overhead "C" frame design with two ram pistons. There
> are a couple reasons I'm going to give double ram cylinders a try:
>
> First is height. If you want a modest 12" of stroke over (for conversation
> sake) a 36" anvil, once you add up all the component lengths you end up with
> a hammer near 8' tall. Using double rams eliminates the need for guides and
> knocks a good 18" off the height of the hammer. The Kickass proves this
> works nicely.
>
> Then there's the simple fact I have a bunch of hydraulic cylinders salvaged
> from the scrap bin at work and a number of them with 14" strokes work out to
> the equivalent of a 4 1/2" cylinder if I double them up. A 4 1/2" ram
> cylinder driven by a 6" compressor piston seem to be what's being used on
> 100 lb. hammers.
>
> I'll have to open the ports on the cylinders some but they'll work just fine
> on air instead of hydraulic fluid. The compressor cylinder will be more work
> as I'm going to follow the Massey design and will have to machine it myself.
>
> The compressor piston in the Massey design is quite thick, close to the
> compressor piston's stroke length. The reason for this very thick piston is
> to allow air ports at the center of the commpressor cylinder with the piston
> itself acting as the valve. These air ports allow for makeup air if the
> compressor is low and vents excess if it's high. All this is to keep the
> hammer from either starving for air or compressing it unnecessarily.
>
> Another way to supply makeup air is by machining flats on the compressor
> piston rods near the piston. At the top and bottom of the stroke, these
> flats pass through the seals in the cylinder caps and open the cylinder to
> the atmosphere.
>
> Once again, I'm going with the centrally located piston ports on the
> compressor cylinder because I was able to salvage a largish slab of 2"
> aluminum plate and have a lathe. I could be entirely wrong but I also feel
> it'll be easier to adjust the volume of makeup air by either drilling more
> ports or plugging them as necessary. Intuition says I can't overdo the
> makeup ports.
>
> Frosty
> ------------------------
> If it ain't forged
> it ain't real.
> Wrought iron is.
> The FrostWorks
>
> Meadow Lakes, AK.
>
> ----- Original Message -----
> From: <[email protected]>
> To: <[email protected]>
> Sent: Friday, July 25, 2003 9:46 AM
> Subject: [TheForge] Air hammer
>
> >
> > Thanks for the patent #. I really enjoied looking at the drawings. I am
> however desiring to better understand the double piston idea. Are you using
> two cylinders to lift the tup? Or are you using them to push it up as in the
> Kick Ass hammer? I really want to get away from relying on a compressor to
> to run the hammer as in the Kynion (sp) style hammers I've built before even
> though they work well, I still want to not run my sqeezer anymore than I
> must.
> >
> > Trusting HIM,
> > Steve Rollert
> > keenedgeknives.com
> > doveknives.com
> > _______________________________________________
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://www.photoaccess.com
> > Login: [email protected]
> > password: anvil
> > ___________
> >
> >
> >
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login: [email protected]
> password: anvil
> ___________
--
-Andy V.
I am the son and the heir
Of a shyness that is criminally vulgar
I am the son and heir
Of nothing in particular