HomeRoast Digest


Topic: rollers (19 msgs / 418 lines)
1) From: Cathy Marley
Will do.  If memory serves (no guarantees) the rollers and their rods
are 
the last item I need material wise.  Due to the extreme temperatures we 
would be putting them at, I am thinking I may well have to cobble
together 
"rollers".  Too many just can not take 500F.  They swell and stop 
rolling.  My present low tech thought is to use a round shaft collar
locked 
onto an appropriately sized bit of SS tubing slipped over a shaft,
probably 
held in place by two other small shaft collars.  Don't know if it will
work 
as planned but I find out.
How about some old steel ball bearing rollerskate wheels.  I had a pair
of 1950's roller skates, the kind you clipped onto your shoes with a
key, in my garage for the past 40 years.  Appropriately mounted, they
could serve, and could withstand heat too.
Cathy
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2) From: AlChemist John
Sometime around 03:51 2/12/2003, Cathy Marley typed:
<Snip>
I am not sure. They might not degrade,  but the main problem I have found 
is not breakdown but seizing as the metal expands.  If you care to donate 
them to science I would try them but it might be a pity to destroy antiques 
like that.
On a similar note, with a number of Alpenroasts on the list having died, 
does anyone have a dead one that you would not mind cannibalizing for the 
rollers. (the drum rotates on rollers right?)  If they do run on rollers, 
what are they made of?
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
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3) From: Ed Needham
I think roller tappets from an auto supply store would work nicely in a high
heat situation.  I'll look into it first chance I get.
Ed Needham
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4) From: Ben Treichel
excellent Idea.
Ed Needham wrote:
<Snip>
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5) From: john kangas
<Snip>
They're designed to operate in oil, but they might work anyways. Worth a 
shot!
I didn't see my previous post, not sure if it got through- Maybe some steel 
pipe, extending through the sides of the BBQ, with the bearings in the ends. 
It'd get them out of the direct heat, anyways. If you use two, the drum can 
just sit between them, and if one or both of the rollers is turned, it'll 
turn the drum. Some automotive header wrap (1500+ degree insulation) would 
help keep the heat out of the pipe, and keep the drum-rolling noise down.
That should keep the temp at the bearings down, enough anyways that if they 
still needed insulation, a high-temp plastic spacer wouldn't burn up.
John Kangas
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6) From: Ben Treichel
john kangas wrote:
<Snip>
Yes, at several thousand rpm. Even without lub, 30 shouldn't be a problem.
<Snip>
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7) From: AlChemist John
Sometime around 07:04 2/12/2003, Ed Needham typed:
<Snip>
Never heard of them but thanks.  I will see what I can find too.  What are 
they used for?
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
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8) From: Ben Treichel
AlChemist John wrote:
<Snip>
engine valve actuation; sorta a think of the past. FYI, don't get 
hydrauilic, they wont work for what you want.
<Snip>
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9) From: Ed Needham
The steel pipes and externally mounted bearings would work.  A bit of a chore
to install, but it would work.  One roller could be connected to a motor and
roll the drum.  Do it!  Report back.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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10) From: john kangas
<Snip>
It depends. Sometimes the rockers use rollers ("roller rockers") where they 
contact the valve. Sometimes they're used on pushrod engines with really 
wild camshafts, these type spin directly on the cam, at the end of the 
lifter. The "roller rocker" type would be much easier to use, with a handy 
rocker attached to bolt to something. Either type would be pretty narrow 
diameter, I haven't seen any over 1/2".
Charlie's graphite seems to handle the heat, maybe some dry graphite "lock 
lube" would hold up for a bit, if needed.
Any auto parts shop that doesn't do "imports only" would know what you're 
looking for.
Here's a link with pictures of both-http://www.cranecams.com/valvetrain.htmTop right are a couple roller rockers, midway down are the roller lifters, 
the cylinders with rollers in the end.
John Kangas
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11) From: Ed Needham
They open and close the valves in a gasoline engine as they roll on the
camshaft lobes.  They are designed to take a LOT of abuse from banging on the
camshaft, to high internal engine heat, as well as rolling thousands of miles
around the camshaft lobes year after year.
No doubt in my mind that they could stand up to the internals of a grill.
Particulate matter 'might' have a negative effect on them, but that's about
all.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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12) From: john kangas
<Snip>
Yes, sir! Already started, just waiting for our brake press Michelangelo to 
bend up a cone shaped end out of a flat piece of stainless steel.
John Kangas
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13) From: Oaxaca Charlie
 Ahemmm-Ed, check your own site, there's a roller/drum system
already being used to roast 5 lb batches daily. I found
out the hard way that only one roller connected to the motor
just spins a lot while the drum sits there. That's why I have
the belt and pully system connecting the two rollers. Steel
pipes and externally mounted bearings also are working like a
charm.
Charlie
--- Ed Needham  wrote:
<Snip>
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14) From: Ed Needham
Good point.  Both rollers need to be powered if done this way.
I didn't forget your design Charlie.  Applying it to a BBQ grill is an
interesting design though.  Looks like John Kangas is doing it.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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15) From: Rick Farris
Charlie wrote:
<Snip>
Hey, the Alpenrost only drives one roller.  Of course, it's a toothed
roller...
-- Rick
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16) From: AlChemist John
Sometime around 21:21 2/12/2003, Ben Treichel typed:
<Snip>
The past doesn't help me, I never worked on engines.  I did see the 
mechanical rollers on the url link.  I could see that it might work.  For 
those who suggested it, were you thinking the whole assembly be mounted in 
some fashion or the roller removed and used?
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
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17) From: Ed Needham
I was thinking the roller tappets could be mounted to the bottom/side wall of
the grill body via a threaded rod and bolts.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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18) From: AlChemist John
Being dense.  So does that mean remove the "rollers" from the assembly it 
is sold with?  What does the "tappet" refer too please?
Sometime around 20:44 2/13/2003, Ed Needham typed:
<Snip>
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

19) From: Ed Needham
The tappet is the assembly that contains the roller (not the rocker
assembly).  It connects to a pushrod, and may be a natural for threading and
bolting to the grill body.  I'll use the whole assembly.  I'll have to go by
the auto parts store and look at a few before committing to this idea.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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