[TheForge] Grinder rollers

[Ron Childers]

Justin, iho, you can use step pulleys and/or build another for the smaller
rollers using a 1750 rpm motor and gear down so as not to turn the small
bearings too fast. It's probably easier to build one for each application
than a system that will accommodate a 1/2" and a 10" wheel. That's if you
like and are adept at building things.... Grizzly sells the 10" wheel for
about $60. The 8" is probably less. If you are platen grinding, you can use
a dolly wheel which already has a crown and a piece of 2" angle for the
platen. The graphite belting sold by Koval works well to silence the noise.
Skate board wheels work ok as idler pulleys, as do automotive idler pulleys.
There are several sites on the internet that have good photos and drawings;
links from anvilfire.com. 


-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of gblacksmith
Sent: Tuesday, August 09, 2005 11:27 AM
To: Sponsored by ABANA
Subject: Re: [TheForge] Grinder rollers

Justin:  There are two "gotchas" in knife grinders:  The variable speed DC 
motors used in the more expensive models, and the contact wheels which 
engage the belts.  Considerable care must also be used in constructing the 
tracking mechanism that positions the belt on the contact wheel.  Take a 
look at a machine like a Bader III and see how subtly complex the whole rig 
is.  Grant
----- Original Message ----- 
From: "Justin Fellenz" <sunironworks at yahoo.com>
To: <artgawk at thegrid.net>; "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, August 09, 2005 8:20 AM
Subject: [TheForge] Grinder rollers


There was a thread about belt grinder rollers a while back. Doesn't
seem too hard to make the steel part. Is the problem finding the right
elastomer and then bonding it to the steel? That's the impression I get
reading the thread--been toying with the idea of building a knife
grinder because they're so flippin expensive to buy, but Iam wondering
if there's a hidden gotcha...

J
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