Re: [CAD_CAM_EDM_DRO] Re: Guides

Yes, it is a difficult task for a DIY person to implement,
especially with limited machining capabilities. It seems to me that the
easiest
would be the combination of cold rolled shafting (made in -) and
self-lubricated
bronze bushing. There may be a problem with load capacity over big length
though.
Alex

----- Original Message -----
From: Harvey White <madyn@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, May 14, 2003 10:48 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Guides


> On Wed, 14 May 2003 23:12:33 -0000, you wrote:
>
> >Harvey White <madyn@i...> wrote:
> >
> >> >You can buy sealed roller bearings from MSC Industrial for $2 or
> >so each. They make great roller guides. MSC also sells cold rolled
> >flat stock which would work great for the rails.
> >>
> >> You can get ABEC 3, 5 or 7 bearings for about 13 dollars up to 20
> >> dollars or so. These will fit on an 8 mm shaft and are roughly 22mm
> >> in diameter. Your local mega-sports store will sell them as roller
> >> blade bearing replacements in tubes of 8.
> >
> >Sorry if this is a dumb questions, but are these bearings, eg.
> >
> >http://www.speed-bearing.com/shop/shop.asp
> >1 tin box with 16 pieces Speed bearings 608-ZRS ABEC7, 1 Speed cream
> >and using instructions
> >
>
> Yes, that's them exactly.
>
>
>
> >for sliding along a guide shaft or holding a rotating shaft.
>
> I have a design based on that, uses 1/2 inch square tubing and 4
> bearings to constrain up/down/left/right movement. It's a bit
> complicated to implement, though. I used (on a table) two assemblies
> of 4 bearings on one side, and 2 assemblies of two bearings. One side
> was not left/right constrained. The assembly was designed mostly for
> up/down resistance.
>
> >
> >Reason I am asking is I am looking for bearings (or are they refered
> >to as bushing instead) for sliding on a shaft that are easy to
> >purchase, eg, in a sports shop in a shopping complex.
>
> That's them.
>
> abec 3 were about 11 USD for the 8 of them.
>
> Harvey
>
> >
> >Thanks.
> >
> >
>
>
>
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