[TheForge] Air Hammer Slides.....

Wed Apr 9 11:30:02 2003

Ahh. yes I too have the over engineering affliction since that's what I do
all day long.  The Cam followers I have utilize a shoulder, so only 6 are
required 4 back and two front the side to side play is eliminated by the
shoulder.  I figured on a piece of 1" tool steel for the track, and just
surface grind the edges, and the two faces.  At about 40RC it ought to hold
up for many years.  The only draw back, is that it probably needs to be
bolted on, instead of welded to prevent warping, and for replaceability.  I
always look at efficiency of design as well as functionality.  Two of the
hammers I have built over the years, will run from as little as 5 cfm.  The
key is reducing friction, thereby reducing required lifting capacity and air
cylinder size.

Paul

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, April 09, 2003 7:01 AM
Subject: Re: [TheForge] Air Hammer Slides.....

> I have contemplated several designs using cam follower bearings.   I
> tend to overdesign everything.  The issues that I have encountered are:
>
> a) It takes at least eight bearings with adjustments to do it.  ( top
> and bottom on each side, otherwise you will rock around the bearing).
> Although I have considered bearings on just two sides.
> b) Setting up the attachment for the bearings is not a simple affair,
> allthough as said I over engineer , and  have laid out automatic
> tensioning with springs.
> c) The bearings will have a lot less contact area than full contact
> brass slides.  This is  good for reducing friction, but will wear tracks
> in the slide more quickly.
>
>
> Charles
>
>
> Paul Hewitt wrote:
>
> >As I was building a trolley for my new swing arm crane today, I marveled
at the fact that no one uses cam follower bearings for the hammer head on a
air hammer.... As always my question is why?
> >
> >They are relatively cheap, and will roll on about any surface, they could
be easily pre-loaded to remove slop, and 6 units would provide service for
life, with very little if any resistance?  They come in all sizes and
shapes, and most are complete with grease zerks.
> >
> >Any insight?
> >
> >
>
>http://www.bograt.com/misc%20graphics/jadawin/08-04-03/NW%20corner%20of%20s
hop%20hyd%20press%20left%20crane%20right.jpg
> >
> >A picture of the nw corner of my shop reveals the new 1000# swing arm
crane although it does not yet have the trolley affixed, nor does it have
the 300# of counter weight attached to the aft of the load beam.
> >
> >Also in the picture is my new hydraulic press frame, It has a single
cylinder to be mounted on the let like a standard punch type hydraulic
press, the center will have a moving beam driver by two 3.5" hydraulic
cylinders so it can be used for shearing, and sheet metal forming as well as
die cutting work, and making forging dies.  The single cylinder will be a 7"
Diameter by 18" extend with an exertion force of about 57 tons...
Guaranteed to break the press I think.
> >
> >
> >
> >
> >Paul Hewitt
> >
> >H&H Custom Solutions/
> >Precision Vinyl Concepts
> >P.O. Box 1486
> >Port Orford Or. 97465
> >
> >http://www.h-hcustomsolutions.com
> >
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