[TheForge] Air Hammer Slides.....

[theforge@mailman.qth.net]

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%20shop%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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